use provisional ready where possible

* Adjust sql jdbc tests

* sql jdbc support should be false

* Fix filter-transforms-combined-test

* Fix different-swap-details-get-separate-pools-test for databricks

* Run ws tests only  for drivers that support it

* Adjust tables-endpoint-test to work with ch

* Remove redundant supports call

* Fix filter-transforms-by-type-test

* Fix filter-transforms-combined-test

.clj-kondo/config.edn

@@ -1,7 +1,7 @@
 ;; -*- comment-column: 100; -*-
 {:config-paths ["macros" "src" "config"]
  :linters
- { ;;
+ {;;
   ;; enabled optional linters (these are disabled by default)
   ;;
 
@@ -178,6 +178,11 @@
      metabase.notification.models/create-notification!
      metabase.pulse.send/send-pulse!
      metabase-enterprise.transforms-python.python-runner-test/execute!
+     ;; Workspace isolation functions are safe in parallel tests because they operate on
+     ;; isolated, test-specific workspaces and databases that don't affect other tests
+     metabase-enterprise.workspaces.isolation/destroy-workspace-isolation!
+     metabase-enterprise.workspaces.isolation/ensure-database-isolation!
+     metabase-enterprise.workspaces.test-util/create-ready-ws!
      ;; Safe in tests, where we typically use a private, temporary index per thread.
      metabase.search.core/reindex!
      metabase.util/run-count!
@@ -191,7 +196,7 @@
   :metabase/disallow-hardcoded-driver-names-in-tests
   ;; don't include `:h2` since that will probably lead to a mountain of tests where we are specifically testing
   ;; middleware or compilation behavior with just H2 since it's the default.
-  {:drivers #{ ;; core drivers
+  {:drivers #{;; core drivers
               #_:h2
               :postgres
               :mysql
@@ -422,6 +427,7 @@
   metabase-enterprise.transforms.api-test/with-worker-runs                              clojure.core/let
   metabase-enterprise.transforms.test-util/with-transform-cleanup!                      clojure.core/let
   metabase-enterprise.transforms.execute/with-transform-lifecycle                       clojure.core/let
+  metabase-enterprise.workspaces.test-util/with-workspaces!                             clojure.core/let
   metabase.actions.test-util/with-actions                                               clojure.core/let
   metabase.api.common/let-404                                                           clojure.core/let
   metabase.app-db.custom-migrations.util/with-temp-scheduler!                           clojure.core/fn

.clj-kondo/config/modules/config.edn

@@ -534,6 +534,11 @@
            metabase.driver.sql-jdbc.execute
            metabase.driver.sql-jdbc.execute.diagnostic
            metabase.driver.sql-jdbc.sync
+           ;; TODO (lbrdnk 2025/12/17): We should revisit addition of the following line. I've added it to make
+           ;; tests pass as we are using it directly with ee/workspaces module. I believe later, when workspaces
+           ;; are in better state quality wise, it should become part of the driver api and that should be used
+           ;; instead of calling directly into the normalize module.
+           metabase.driver.sql.normalize
            metabase.driver.sql.query-processor
            metabase.driver.sql.util
            metabase.driver.sync
@@ -2279,6 +2284,7 @@
   {:team "Querying"
    :api  #{metabase-enterprise.transforms.api
            metabase-enterprise.transforms.core
+           metabase-enterprise.transforms.execute
            metabase-enterprise.transforms.init
            metabase-enterprise.transforms.instrumentation
            metabase-enterprise.transforms.interface
@@ -2312,6 +2318,7 @@
            app-db
            config
            driver
+           events
            lib
            lib-be
            query-processor
@@ -2326,7 +2333,24 @@
            models
            premium-features
            upload
-           util}}}
+           util}}
+
+  enterprise/workspaces
+  {:team "Metabot"
+   :api  #{metabase-enterprise.workspaces.api
+           metabase-enterprise.workspaces.init}
+   :uses #{api
+           api-keys
+           app-db
+           driver
+           lib
+           lib-be
+           models
+           queries
+           request
+           system
+           util
+           enterprise/transforms}}}
 
  ;; namespaces matching these patterns (with `re-find`) are excluded from the module linter. Since regex literals
  ;; aren't allowed in EDN just used the `(str <regex>)` version i.e. two slashes instead of one.

.cljfmt.edn

@@ -90,6 +90,7 @@
   metabase-enterprise.test/with-gtaps!                                                        [[:inner 0]]
   metabase-enterprise.test/with-gtaps-for-user!                                               [[:inner 0]]
   metabase-enterprise.test/with-user-attributes                                               [[:block 2]]
+  metabase-enterprise.workspaces.models.workspace-log/track!                                  [[:block 2]]
   metabase.actions.actions-test/with-actions-test-data-and-actions-permissively-enabled       [[:block 0]]
   metabase.actions.test-util/with-actions                                                     [[:block 1]]
   metabase.actions.test-util/with-actions-disabled                                            [[:block 0]]

.dir-locals.el

@@ -61,6 +61,7 @@
   (eval . (put-clojure-indent 'u/prog1                         1))
   (eval . (put-clojure-indent 'u/select-keys-when              '(:form)))
   (eval . (put-clojure-indent 'with-meta                       '(:form)))
+  (eval . (put-clojure-indent 'ws.log/track!                   2))
   ;; these ones have to be done with `define-clojure-indent' for now because of upstream bug
   ;; https://github.com/clojure-emacs/clojure-mode/issues/600 once that's resolved we should use `put-clojure-indent'
   ;; instead. Please don't add new entries unless they don't work with `put-clojure-indent'

.gitconfig

@@ -1,7 +1,5 @@
 # execute this in your shell to enable custom merge driver:
 # echo '\n[include]\npath=../.gitconfig' >> .git/config
-#
-# TODO (Bryan 12/12/25) -- reenable this when we can completely verify correctness
-# [merge "yaml-migrations"]
-#     name = YAML migration changeset-aware merge
-#     driver = mage -merge-yaml-migrations %O %A %B %L %P
+[merge "yaml-migrations"]
+    name = YAML migration changeset-aware merge
+    driver = bin/mage -merge-yaml-migrations %O %A %B %L %P

bin/build/resources/overrides.edn

@@ -24,6 +24,9 @@
  "dev.failsafe"                {"failsafe" {:resource "LICENSE"}}
  "colorize"                    {"colorize" {:resource "EPL.txt"}}
  "com.github.jnr"              {"jffi$native" {:resource "apache2_0.txt"}}
+ "com.google.api"              {"gax" {:resource "BSD.txt"}
+                                "gax-grpc" {:resource "BSD.txt"}
+                                "gax-httpjson" {:resource "BSD.txt"}}
  "com.google.api-client"       {"google-api-client" {:resource "apache2_0.txt"}}
  "com.google.auto.value"       {"auto-value-annotations" {:resource "apache2_0.txt"}}
  "com.google.http-client"      {"google-http-client"          {:resource "apache2_0.txt"}
@@ -60,6 +63,7 @@
  "net.thisptr"                 {"jackson-jq" {:resource "apache2_0.txt"}}
  "org.antlr"                   {"antlr-runtime"  {:resource "BSD.txt"}
                                 "antlr4-runtime" {:resource "BSD.txt"}}
+ "org.codehaus.mojo"           {"animal-sniffer-annotations" {:resource "MIT.txt"}}
  "org.eclipse.jgit"            {"org.eclipse.jgit" {:resource "BSD.txt"}}
  "org.eclipse.jetty"           {"jetty-webapp" {:resource "EPL.txt"}}
  "org.eclipse.jetty.toolchain" {"jetty-jakarta-servlet-api" {:resource "EPL.txt"}}

bin/lint-migrations-file/src/lint_migrations_file.cljc

@@ -144,6 +144,18 @@
    change-log
    #(pos? (compare % "v49.00-000"))))
 
+(defn require-primary-key-exists-has-table-name
+  "Ensures that all primaryKeyExists preconditions specify a tableName."
+  [change-log]
+  (doseq [{:keys [changeSet]} change-log
+          :when changeSet
+          :let [s (pr-str (:preConditions changeSet))]
+          :when (and (str/includes? s ":primaryKeyExists")
+                     (not (str/includes? s ":tableName")))]
+    (throw (validation-error
+            (format "Migration '%s' has primaryKeyExists precondition without tableName" (:id changeSet))
+            {:id (:id changeSet)}))))
+
 (s/def ::changeSet
   (s/spec :change-set.strict/change-set))
 
@@ -163,6 +175,7 @@
   (require-no-bare-blob-or-text-types change-log)
   (require-no-bare-boolean-types change-log)
   (require-no-datetime-type change-log)
+  (require-primary-key-exists-has-table-name change-log)
   (let [{:keys [changeSet]
          :as all} (group-by only-key change-log)]
     (when-not (set/subset? (set (keys all)) #{:property :objectQuotingStrategy :changeSet})

deps.edn

@@ -36,7 +36,7 @@
   com.clearspring.analytics/stream          {:mvn/version "2.9.8"               ; Various sketching algorithms
                                              :exclusions  [it.unimi.dsi/fastutil
                                                            org.slf4j/slf4j-api]}
-  com.clojure-goes-fast/jvm-alloc-rate-meter{:mvn/version "0.1.4"}              ; Monitor heap allocation rate.
+  com.clojure-goes-fast/jvm-alloc-rate-meter {:mvn/version "0.1.4"}              ; Monitor heap allocation rate.
   com.clojure-goes-fast/jvm-hiccup-meter    {:mvn/version "0.1.1"}              ; Monitor GC pauses and other system-induced pauses.
   com.draines/postal                        {:mvn/version "2.0.5"               ; SMTP library
                                              :exclusions [com.sun.mail/jakarta.mail]}
@@ -45,7 +45,7 @@
   com.github.albfernandez/juniversalchardet {:mvn/version "2.5.0"}
   com.github.blagerweij/liquibase-sessionlock {:mvn/version "1.6.9"}            ; session lock for liquibase migrations
   com.github.jknack/handlebars              ^:antq/exclude                      ; 4.4.0 requires java 17+
-                                            {:mvn/version "4.3.1"}              ; templating engine
+  {:mvn/version "4.3.1"}              ; templating engine
   com.github.oliyh/martian-clj-http         {:mvn/version "0.2.1"}             ; openapi client
   com.github.seancorfield/honeysql          {:mvn/version "2.7.1350"}           ; Honey SQL 2. SQL generation from Clojure data maps
   com.github.seancorfield/next.jdbc         {:mvn/version "1.3.1070"}           ; Talk to JDBC DBs
@@ -53,12 +53,12 @@
   com.github.vertical-blank/sql-formatter   {:mvn/version "2.0.5"}              ; Java SQL formatting library https://github.com/vertical-blank/sql-formatter
   com.google.guava/guava                    {:mvn/version "33.5.0-jre"}         ; dep for BigQuery, Spark, and GA. Require here rather than letting different dep versions stomp on each other — see comments on #9697
   com.h2database/h2                         ^:antq/exclude                      ; https://metaboat.slack.com/archives/CKZEMT1MJ/p1727191010259979
-                                            {:mvn/version "2.1.214"}            ; embedded SQL database
+  {:mvn/version "2.1.214"}            ; embedded SQL database
   com.ibm.icu/icu4j                         {:mvn/version "78.1"}               ; Used to transliterate Unicode characters into Latin characters
   com.knuddels/jtokkit                      {:mvn/version "1.1.0"}              ; Java tokenizer library for OpenAI models, used for token counting in semantic search
   com.mchange/c3p0                          {:mvn/version "0.11.2"}             ; DB connection pool
   com.snowplowanalytics/snowplow-java-tracker ^:antq/exclude                    ; 2+ depend on apache httpclient 5.x, but saml and clj-http depend on 4.x
-                                            {:mvn/version "1.0.1"}              ; Snowplow analytics
+  {:mvn/version "1.0.1"}              ; Snowplow analytics
   com.sun.mail/jakarta.mail                 ^:antq/exclude                      ; 2+ changes imports from javax.mail to jakarta.mail
                                             {:mvn/version "1.6.8"}              ; SMTP lib, required by postal
   com.taoensso/encore                       {:mvn/version "3.158.0"}            ; Utilities library (used by Nippy)
@@ -891,8 +891,7 @@
   {:exec-args {:only ["enterprise/backend/test/metabase_enterprise/transforms"
                       "enterprise/backend/test/metabase_enterprise/transforms_python"]}}
 
-
-  ;; test all MBQL related stuff: MLv2, the legacy shared `metabase.legacy-mbql` code, and the QP
+;; test all MBQL related stuff: MLv2, the legacy shared `metabase.legacy-mbql` code, and the QP
   ;;
   ;;    clj -X:dev:ee:ee-dev:test:test/mbql
   :test/mbql

docs/developers-guide/driver-changelog.md

@@ -8,6 +8,11 @@ title: Driver interface changelog
 
 - Added `sql-jdbc.execute/db-type-name` multimethod. Override this if something more than the default is needed in your sql-jdbc-based driver. See the `:mysql` implementation as an example.
 
+- Added workspace isolation multimethods for enterprise workspaces feature:
+  - `init-workspace-isolation!` - Initialize database isolation for a workspace (create isolated schema/database and user credentials)
+  - `destroy-workspace-isolation!` - Destroy all database resources created for workspace isolation
+  - `grant-workspace-read-access!` - Grant read access on specified tables to a workspace's isolated user
+
 ## Metabase 0.58.0
 
 - Added a `:collate` feature for drivers that support collation settings on text fields

e2e/support/helpers/e2e-ui-elements-helpers.js

@@ -78,7 +78,11 @@ export function entityPickerModalItem(level, name) {
 }
 
 export function entityPickerModalTab(name) {
-  return cy.findAllByRole("tab").filter(`:contains(${name})`);
+  if (typeof name === "string") {
+    return cy.findAllByRole("tab").filter(`:contains(${name})`);
+  } else {
+    return cy.findAllByRole("tab").first().parent().findByText(name);
+  }
 }
 
 // displays at least these tabs:

e2e/support/helpers/e2e-workspaces-helpers.ts

@@ -0,0 +1,99 @@
+import type { WorkspaceId } from "metabase-types/api";
+
+export const Workspaces = {
+  visit: (id: WorkspaceId) => {
+    return cy.visit(`/data-studio/workspace/${id}`);
+  },
+
+  visitDataStudio() {
+    return cy.visit("/data-studio");
+  },
+
+  visitTransformListPage() {
+    return cy.visit("/data-studio/transforms");
+  },
+
+  getWorkspacesPage() {
+    return cy.findByTestId("workspaces-page");
+  },
+
+  getWorkspacePage() {
+    return cy.findByTestId("workspace-page");
+  },
+
+  getWorkspaceContent() {
+    return cy.findByTestId("workspace-content");
+  },
+
+  getWorkspaceSidebar() {
+    return cy.findByTestId("workspace-sidebar");
+  },
+
+  getWorkspacesSection() {
+    return cy.findByTestId("workspaces-section");
+  },
+
+  getWorkspaceItem(name: string | RegExp) {
+    return Workspaces.getWorkspacesSection().find(`button[name="${name}"]`);
+  },
+
+  getWorkspaceItemStatus(name: string | RegExp) {
+    return Workspaces.getWorkspaceItem(name).findByTestId("workspace-status");
+  },
+
+  getWorkspaceItemActions(name: string | RegExp) {
+    return Workspaces.getWorkspaceItem(name).findByLabelText("More actions");
+  },
+
+  getWorkspaceNameInput() {
+    return cy.findByPlaceholderText("Workspace name");
+  },
+
+  getMergeWorkspaceButton() {
+    return cy.findByRole("button", { name: /Merge/ });
+  },
+
+  getWorkspaceDatabaseSelect() {
+    return cy.findByPlaceholderText("Select a database");
+  },
+
+  getRunWorkspaceButton() {
+    return Workspaces.getWorkspacePage().findByRole("button", {
+      name: /Run transforms/,
+    });
+  },
+
+  getTransformTargetButton() {
+    return cy.findByRole("button", { name: /Change target/ });
+  },
+
+  getRunTransformButton() {
+    return Workspaces.getWorkspaceContent().findByRole("button", {
+      name: /Run/,
+    });
+  },
+
+  getSaveTransformButton() {
+    return cy.findByRole("button", { name: /Save/ });
+  },
+
+  getWorkspaceTransforms() {
+    return cy.findByTestId("workspace-transforms");
+  },
+
+  getMainlandTransforms() {
+    return cy.findByTestId("mainland-transforms");
+  },
+
+  getNewWorkspaceButton() {
+    return cy.findByRole("button", { name: /New workspace/ });
+  },
+
+  getNewWorkspaceNameInput() {
+    return cy.findByPlaceholderText("Enter workspace name");
+  },
+
+  getNewWorkspaceDatabaseInput() {
+    return cy.findByPlaceholderText("Select a database");
+  },
+};

e2e/support/helpers/index.ts

@@ -13,9 +13,9 @@ export * from "./e2e-comment-helpers";
 export * from "./e2e-custom-column-helpers";
 export * from "./e2e-dashboard-helpers";
 export * from "./e2e-dashboard-visualizer-helpers";
+export * from "./e2e-data-studio-helpers";
 export * from "./e2e-database-metadata-helpers";
 export * from "./e2e-datamodel-helpers";
-export * from "./e2e-data-studio-helpers";
 export * from "./e2e-dependency-graph-helpers";
 export * from "./e2e-detail-view-helpers";
 export * from "./e2e-dimension-list-helpers";
@@ -60,4 +60,5 @@ export * from "./e2e-upload-helpers";
 export * from "./e2e-users-helpers";
 export * from "./e2e-visual-tests-helpers";
 export * from "./e2e-viz-settings-helpers";
+export * from "./e2e-workspaces-helpers";
 export * from "./embedding-sdk-helpers/constants";

e2e/test/scenarios/data-studio/workspaces.cy.spec.ts

@@ -0,0 +1,391 @@
+import dedent from "ts-dedent";
+
+import { SAMPLE_DB_ID, WRITABLE_DB_ID } from "e2e/support/cypress_data";
+import { SAMPLE_DATABASE } from "e2e/support/cypress_sample_database";
+import type {
+  CardType,
+  PythonTransformTableAliases,
+  TransformTagId,
+} from "metabase-types/api";
+
+const { H } = cy;
+const { DataStudio, Workspaces } = H;
+const { Transforms } = DataStudio;
+
+const { ORDERS_ID } = SAMPLE_DATABASE;
+
+const DB_NAME = "Writable Postgres12";
+const SOURCE_TABLE = "Animals";
+const TARGET_TABLE = "transform_table";
+const TARGET_TABLE_2 = "transform_table_2";
+const TARGET_SCHEMA = "Schema A";
+const TARGET_SCHEMA_2 = "Schema B";
+const CUSTOM_SCHEMA = "custom_schema";
+
+describe("scenarios > data studio > workspaces", () => {
+  beforeEach(() => {
+    H.restore("postgres-writable");
+    H.resetTestTable({ type: "postgres", table: "many_schemas" });
+    H.resetSnowplow();
+    cy.signInAsAdmin();
+    H.activateToken("bleeding-edge");
+    H.resyncDatabase({ dbId: WRITABLE_DB_ID, tableName: SOURCE_TABLE });
+
+    cy.intercept("POST", "/api/ee/workspace").as("createWorkspace");
+    // cy.intercept("PUT", "/api/field/*").as("updateField");
+    // cy.intercept("PUT", "/api/ee/transform/*").as("updateTransform");
+    // cy.intercept("DELETE", "/api/ee/transform/*").as("deleteTransform");
+    // cy.intercept("DELETE", "/api/ee/transform/*/table").as(
+    //   "deleteTransformTable",
+    // );
+    // cy.intercept("POST", "/api/ee/transform-tag").as("createTag");
+    // cy.intercept("PUT", "/api/ee/transform-tag/*").as("updateTag");
+    // cy.intercept("DELETE", "/api/ee/transform-tag/*").as("deleteTag");
+  });
+
+  // afterEach(() => {
+  //   H.expectNoBadSnowplowEvents();
+  // });
+
+  it("should be able to create, navigate, archive, unarchive, rename, and delete workspaces", () => {
+    Workspaces.visitDataStudio();
+
+    Workspaces.getWorkspacesSection()
+      .findByText("No workspaces yet")
+      .should("be.visible");
+
+    createWorkspace();
+    cy.wait("@createWorkspace").then((interception) => {
+      const workspaceName = interception.response?.body?.name;
+      // Backend returns randomized name.
+      cy.wrap(workspaceName).as("workspaceNameA");
+    });
+
+    cy.location("pathname").should("match", /data-studio\/workspaces\/\d+/);
+
+    cy.log("shows workspace name");
+    cy.get("@workspaceNameA").then((workspaceName) => {
+      Workspaces.getWorkspaceNameInput().should("have.value", workspaceName);
+    });
+    Workspaces.getMergeWorkspaceButton().should("be.disabled");
+
+    Workspaces.getWorkspaceContent().within(() => {
+      cy.log("Starts on setup tab, and has only 2 tabs");
+      H.tabsShouldBe("Setup", ["Setup", "Agent Chat"]);
+
+      cy.log("shows workspace db");
+      Workspaces.getWorkspaceDatabaseSelect()
+        .should("have.value", "Writable Postgres12")
+        .should("be.enabled");
+
+      cy.log("Doesn't show workspace setup logs");
+      cy.findByText("Setting up the workspace").should("not.exist");
+    });
+
+    Workspaces.getWorkspaceSidebar().within(() => {
+      cy.log("starts on Code tab, and has only 2 tabs");
+      H.tabsShouldBe("Code", ["Code", "Data"]);
+
+      cy.log("shows transforms lists");
+      cy.findByText("Workspace is empty").should("be.visible");
+      cy.findByText("No available transforms").should("be.visible");
+    });
+
+    createWorkspace();
+    // Workspaces.getNewWorkspaceButton().click();
+    cy.wait("@createWorkspace").then((interception) => {
+      const workspaceName = interception.response?.body?.name;
+      // Backend returns randomized name.
+      cy.wrap(workspaceName).as("workspaceNameB");
+    });
+    cy.get("@workspaceNameB").then((workspaceNameB: string) => {
+      Workspaces.getWorkspaceNameInput().should("have.value", workspaceNameB);
+
+      cy.get("@workspaceNameA").then((workspaceNameA) => {
+        Workspaces.getWorkspacesSection().within(() => {
+          cy.findByText(workspaceNameB).should("be.visible");
+          cy.findByText(workspaceNameA).should("be.visible").click();
+        });
+
+        cy.log("can archive a workspace");
+        Workspaces.getWorkspaceItemStatus(workspaceNameA).should(
+          "contain.text",
+          "Ready",
+        );
+        Workspaces.getWorkspaceItemActions(workspaceNameA).click();
+        H.popover().findByText("Archive").click();
+        verifyAndCloseToast("Workspace archived successfully");
+
+        cy.log("should show archived workspaces and their status");
+        Workspaces.getWorkspaceItem(workspaceNameA).should(
+          "contain.text",
+          "Archived",
+        );
+
+        // TODO: Move to another test, because we can't unarchive uninitialized workspace
+        // cy.log("can unarchive a workspace");
+        // Workspaces.getWorkspaceItemActions(workspaceNameA).click();
+        // H.popover().findByText("Restore").click();
+        // verifyAndCloseToast("Workspace restored successfully");
+        // Workspaces.getWorkspaceItem(workspaceNameA).should(
+        //   "contain.text",
+        //   "Ready",
+        // );
+
+        cy.log("can delete a workspace");
+        Workspaces.getWorkspaceItemActions(workspaceNameA).click();
+        H.popover().findByText("Delete").click();
+        H.modal().findByText("Delete").click();
+        verifyAndCloseToast("Workspace deleted successfully");
+        Workspaces.getWorkspaceItem(workspaceNameA).should("not.exist");
+
+        cy.location("pathname").should("match", /data-studio\/workspaces\/\d+/);
+        Workspaces.getWorkspaceNameInput().should("have.value", workspaceNameB);
+
+        Workspaces.getWorkspaceNameInput()
+          .clear()
+          .type("Renamed workspace")
+          .blur();
+        Workspaces.getWorkspaceItem("Renamed workspace").should("be.visible");
+      });
+    });
+  });
+
+  it("should be able to check out exisitng transform into a new workspace from the transform page", () => {
+    const sourceTable = `${TARGET_SCHEMA}.${SOURCE_TABLE}`;
+
+    createTransforms({ visit: true });
+
+    cy.findByRole("button", { name: /Edit transform/ }).click();
+    H.popover().within(() => {
+      cy.findByText("No workspaces yet").should("be.visible");
+      cy.findByText("New workspace").should("be.visible").click();
+    });
+
+    Workspaces.getNewWorkspaceNameInput().should("have.value", "New workspace");
+    Workspaces.getNewWorkspaceDatabaseInput().should(
+      "have.value",
+      "Writable Postgres12",
+    );
+    H.modal().findByText("Create").click();
+
+    cy.location("pathname").should("match", /data-studio\/workspaces\/\d+/);
+    Workspaces.getWorkspaceNameInput().should("have.value", "New workspace");
+
+    Workspaces.getWorkspacePage()
+      .findByText("Workspace is empty")
+      .should("not.exist");
+    Workspaces.getMainlandTransforms()
+      .findByText("Python transform")
+      .should("be.visible");
+    Workspaces.getMainlandTransforms()
+      .findByText("MBQL transform")
+      .should("not.exist");
+    Workspaces.getWorkspaceTransforms()
+      .findByText("SQL transform")
+      .should("be.visible")
+      .click();
+
+    Workspaces.getWorkspaceContent().within(() => {
+      H.tabsShouldBe("SQL transform", ["Setup", "Agent Chat", "SQL transform"]);
+    });
+    Workspaces.getMergeWorkspaceButton().should("be.enabled");
+    Workspaces.getRunWorkspaceButton().should("be.enabled");
+    Workspaces.getTransformTargetButton().should("be.enabled");
+    Workspaces.getRunTransformButton().should("be.enabled");
+    Workspaces.getSaveTransformButton().should("be.disabled");
+
+    H.NativeEditor.type(" LIMIT 2");
+    Workspaces.getMergeWorkspaceButton().should("be.disabled");
+    Workspaces.getRunWorkspaceButton().should("be.disabled");
+    Workspaces.getTransformTargetButton().should("be.disabled");
+    Workspaces.getRunTransformButton().should("be.disabled");
+    Workspaces.getSaveTransformButton().should("be.enabled").click();
+
+    Workspaces.getMergeWorkspaceButton().should("be.enabled");
+    Workspaces.getRunWorkspaceButton().should("be.enabled");
+    Workspaces.getTransformTargetButton().should("be.enabled");
+    Workspaces.getSaveTransformButton().should("be.disabled");
+    Workspaces.getRunTransformButton().should("be.enabled").click();
+
+    Workspaces.getWorkspaceSidebar().within(() => {
+      cy.findByRole("tab", { name: "Data" }).click();
+      cy.findByLabelText(sourceTable).should("be.visible").click();
+    });
+
+    Workspaces.getWorkspaceContent().within(() => {
+      H.tabsShouldBe(sourceTable, [
+        "Setup",
+        "Agent Chat",
+        "SQL transform",
+        sourceTable,
+      ]);
+      H.assertTableData({
+        columns: ["Name", "Score"],
+        firstRows: [
+          ["Duck", "10"],
+          ["Horse", "20"],
+          ["Cow", "30"],
+        ],
+      });
+    });
+
+    Workspaces.getWorkspaceSidebar().within(() => {
+      cy.findByRole("tab", { name: "Data" }).click();
+      cy.findByLabelText(/mb__isolation_/)
+        .should("be.visible")
+        .click();
+    });
+
+    Workspaces.getWorkspaceContent().within(() => {
+      H.tabsShouldBe(/mb__isolation_/, [
+        "Setup",
+        "Agent Chat",
+        "SQL transform",
+        sourceTable,
+        /mb__isolation_/,
+      ]);
+      H.assertTableData({
+        columns: ["Name", "Score"],
+        firstRows: [
+          ["Duck", "10"],
+          ["Horse", "20"],
+        ],
+      });
+      cy.findByText("Cow").should("not.exist");
+      cy.findByText("30").should("not.exist");
+    });
+
+    Workspaces.getMergeWorkspaceButton().click();
+
+    cy.findByRole("link", { name: /SQL transform/ }).click();
+    H.NativeEditor.value().should(
+      "eq",
+      'SELECT * FROM "Schema A"."Animals" LIMIT 2',
+    );
+    Transforms.runTab().click();
+    runTransformAndWaitForSuccess();
+    Transforms.targetTab().click();
+    getTableLink().should("contain.text", "transform_table").click();
+
+    H.assertTableData({
+      columns: ["Name", "Score"],
+      firstRows: [
+        ["Duck", "10"],
+        ["Horse", "20"],
+      ],
+    });
+    H.tableInteractiveBody().findByText("Cow").should("not.exist");
+    H.tableInteractiveBody().findByText("30").should("not.exist");
+  });
+
+  // it("should be able to check out existing transform into a new workspace from the workspace page", () => {
+  //   createTransforms({ visit: true });
+  // });
+});
+
+function createWorkspace() {
+  Workspaces.getNewWorkspaceButton().click();
+  // H.modal().findByText("Create new workspace").should("be.visible");
+  // Workspaces.getNewWorkspaceNameInput().clear().type(name);
+  // Workspaces.getNewWorkspaceDatabaseInput().click();
+  // H.popover().within(() => {
+  //   // cy.findByText("Internal Metabase Database").should("not.exist"); // TODO: uncomment once it works
+  //   // cy.findByText("Sample Database").should("not.exist"); // TODO: uncomment once it works
+  //   cy.findByText("Writable Postgres12").should("be.visible").click();
+  // });
+  // H.modal().findByText("Create").click();
+}
+
+function createTransforms({ visit }: { visit?: boolean } = {}) {
+  createMbqlTransform({
+    targetTable: TARGET_TABLE,
+    visitTransform: true,
+  });
+
+  H.getTableId({ name: "Animals", databaseId: WRITABLE_DB_ID }).then((id) => {
+    createPythonTransform({
+      body: dedent`
+          import pandas as pd
+
+          def transform(foo):
+            return pd.DataFrame([{"foo": 42 }])
+        `,
+      sourceTables: { foo: id },
+    });
+  });
+
+  createSqlTransform({
+    sourceQuery: `SELECT * FROM "${TARGET_SCHEMA}"."${SOURCE_TABLE}"`,
+    visitTransform: visit,
+  });
+}
+
+function createMbqlTransform(
+  opts: {
+    sourceTable?: string;
+    targetTable?: string;
+    targetSchema?: string | null;
+    tagIds?: TransformTagId[];
+    name?: string;
+    databaseId?: number;
+    visitTransform?: boolean;
+  } = {},
+) {
+  return H.createMbqlTransform({
+    sourceTable: SOURCE_TABLE,
+    targetTable: TARGET_TABLE,
+    targetSchema: TARGET_SCHEMA,
+    name: "MBQL transform",
+    ...opts,
+  });
+}
+
+function createSqlTransform(opts: {
+  sourceQuery: string;
+  targetTable?: string;
+  targetSchema?: string;
+  tagIds?: TransformTagId[];
+  visitTransform?: boolean;
+}) {
+  return H.createSqlTransform({
+    targetTable: TARGET_TABLE,
+    targetSchema: TARGET_SCHEMA,
+    ...opts,
+  });
+}
+
+function createPythonTransform(opts: {
+  body: string;
+  sourceTables: PythonTransformTableAliases;
+  targetTable?: string;
+  targetSchema?: string;
+  tagIds?: TransformTagId[];
+  visitTransform?: boolean;
+}) {
+  return H.createPythonTransform({
+    targetTable: TARGET_TABLE,
+    targetSchema: TARGET_SCHEMA,
+    ...opts,
+  });
+}
+
+function getTableLink({ isActive = true }: { isActive?: boolean } = {}) {
+  return cy
+    .findByTestId("table-link")
+    .should("have.attr", "aria-disabled", String(!isActive));
+}
+
+function runTransformAndWaitForSuccess() {
+  getRunButton().click();
+  getRunButton().should("have.text", "Ran successfully");
+}
+
+function getRunButton(options: { timeout?: number } = {}) {
+  return cy.findAllByTestId("run-button").eq(0, options);
+}
+
+function verifyAndCloseToast(message: string) {
+  H.undoToast().should("contain.text", message);
+  H.undoToast().icon("close").click({ force: true });
+}

enterprise/backend/src/metabase_enterprise/api_routes/routes.clj

@@ -40,6 +40,7 @@
    [metabase-enterprise.transforms-python.api]
    [metabase-enterprise.transforms.api]
    [metabase-enterprise.upload-management.api]
+   [metabase-enterprise.workspaces.api]
    [metabase.api.macros :as api.macros]
    [metabase.api.util.handlers :as handlers]
    [metabase.util.i18n :refer [deferred-tru]]))
@@ -134,7 +135,8 @@
    "/transform-job"                (premium-handler metabase-enterprise.transforms.api/transform-job-routes :transforms)
    "/transform-tag"                (premium-handler metabase-enterprise.transforms.api/transform-tag-routes :transforms)
    "/tenant"                       (premium-handler metabase-enterprise.tenants.api/routes :tenants)
-   "/upload-management"            (premium-handler metabase-enterprise.upload-management.api/routes :upload-management)})
+   "/upload-management"            (premium-handler metabase-enterprise.upload-management.api/routes :upload-management)
+   "/workspace"                    metabase-enterprise.workspaces.api/routes})
 ;;; ↑↑↑ KEEP THIS SORTED OR ELSE ↑↑↑
 
 (def ^:private routes-map

enterprise/backend/src/metabase_enterprise/core/init.clj

@@ -22,4 +22,5 @@
    [metabase-enterprise.stale.init]
    [metabase-enterprise.support-access-grants.init]
    [metabase-enterprise.transforms-python.init]
-   [metabase-enterprise.transforms.init]))
+   [metabase-enterprise.transforms.init]
+   [metabase-enterprise.workspaces.init]))

enterprise/backend/src/metabase_enterprise/dependencies/calculation.clj

@@ -42,6 +42,12 @@
             query-deps
             param-card-ids)))
 
+(mu/defn upstream-deps:python-transform :- ::deps.schema/upstream-deps
+  "Given a Toucan `:model/Transform`, return its upstream dependencies as a map from the kind to a set of IDs."
+  [{{tables :source-tables} :source :as _py-transform}
+   :- [:map [:source-tables {:optional true} [:map-of :string :int]]]]
+  {:table (set (vals tables))})
+
 (mu/defn upstream-deps:transform :- ::deps.schema/upstream-deps
   "Given a Transform (in Toucan form), return its upstream dependencies."
   [{{:keys [query], source-type :type} :source :as transform} :-
@@ -50,9 +56,15 @@
               [:query
                [:map [:query ::lib.schema/query]]]
               [:python
-               [:map]]]]]]
-  (if (= (keyword source-type) :query)
+               [:map [:source-tables {:optional true} [:map-of :string :int]]]]]]]]
+  (cond
+    (= (keyword source-type) :query)
     (upstream-deps:query query)
+
+    (= (keyword source-type) :python)
+    (upstream-deps:python-transform transform)
+
+    :else
     (do (log/warnf "Don't know how to analyze the deps of Transform %d with source type '%s'" (:id transform) source-type)
         {})))
 

enterprise/backend/src/metabase_enterprise/serialization/v2/models.clj

@@ -116,4 +116,16 @@
    "User"
    "UserKeyValue"
    "UserParameterValue"
-   "ViewLog"])
+   "ViewLog"
+   "Workspace"
+   ;; TODO (lbrdnk 2025/12/17): I've added rest of the workspace models. I believe some of those will be available for
+   ;; serialization, hence we should revisit this later in the project.
+   "WorkspaceDependency"
+   "WorkspaceInput"
+   "WorkspaceInputExternal"
+   "WorkspaceLog"
+   "WorkspaceMerge"
+   "WorkspaceMergeTransform"
+   "WorkspaceOutput"
+   "WorkspaceOutputExternal"
+   "WorkspaceTransform"])

enterprise/backend/src/metabase_enterprise/transforms/api.clj

@@ -81,9 +81,13 @@
 
 (defn get-transforms
   "Get a list of transforms."
-  [& {:keys [last_run_start_time last_run_statuses tag_ids]}]
+  [& {:keys [last_run_start_time last_run_statuses tag_ids database_id type]}]
   (api/check-superuser)
-  (let [transforms (t2/select :model/Transform {:order-by [[:id :asc]]})]
+  (let [type       (when type (map #(if (= % "query") "mbql" %) type))
+        where      (cond-> [:and]
+                     type        (conj [:in :source_type type])
+                     database_id (conj [:= :target_db_id database_id]))
+        transforms (t2/select :model/Transform {:where where :order-by [[:id :asc]]})]
     (into []
           (comp (transforms.util/->date-field-filter-xf [:last_run :start_time] last_run_start_time)
                 (transforms.util/->status-filter-xf [:last_run :status] last_run_statuses)
@@ -106,14 +110,35 @@
    [:map
     [:last_run_start_time {:optional true} [:maybe ms/NonBlankString]]
     [:last_run_statuses {:optional true} [:maybe (ms/QueryVectorOf [:enum "started" "succeeded" "failed" "timeout"])]]
-    [:tag_ids {:optional true} [:maybe (ms/QueryVectorOf ms/IntGreaterThanOrEqualToZero)]]]]
+    [:tag_ids {:optional true} [:maybe (ms/QueryVectorOf ms/IntGreaterThanOrEqualToZero)]]
+    [:database_id {:optional true} [:maybe ms/PositiveInt]]
+    [:type {:optional true} [:maybe (ms/QueryVectorOf [:enum "query" "native" "python"])]]]]
   (get-transforms query-params))
 
-;; TODO (Cam 2025-11-25) please add a response schema to this API endpoint, it makes it easier for our customers to
-;; use our API + we will need it when we make auto-TypeScript-signature generation happen
-;;
-#_{:clj-kondo/ignore [:metabase/validate-defendpoint-has-response-schema]}
-(api.macros/defendpoint :post "/"
+(defn create-transform!
+  "Create new transform in the appdb.
+   Optionally accepts a creator-id to use instead of the current user (for workspace merges)."
+  ([body]
+   (create-transform! body nil))
+  ([body creator-id]
+   (let [creator-id (or creator-id api/*current-user-id*)
+         transform  (t2/with-transaction [_]
+                      (let [tag-ids   (:tag_ids body)
+                            transform (t2/insert-returning-instance!
+                                       :model/Transform
+                                       (assoc (select-keys body [:name :description :source :target :run_trigger])
+                                              :creator_id creator-id))]
+                        ;; Add tag associations if provided
+                        (when (seq tag-ids)
+                          (transform.model/update-transform-tags! (:id transform) tag-ids))
+                        ;; Return with hydrated tag_ids
+                        (t2/hydrate transform :transform_tag_ids :creator)))]
+     (events/publish-event! :event/transform-create {:object transform :user-id api/*current-user-id*})
+     transform)))
+
+;; TODO (chris 2025/12/16) fully populate the result schema
+;; TODO (lbrdnk 2025/12/16) relaxed result schema to unblock FE. This should be properly handled later.
+(api.macros/defendpoint :post "/" :- [:map [:name :string] [:description {:optional true} [:maybe :string]]]
   "Create a new transform."
   [_route-params
    _query-params
@@ -183,6 +208,34 @@
         dependencies (map id->transform dep-ids)]
     (t2/hydrate dependencies :creator)))
 
+(def ^:private MergeHistoryEntry
+  [:map
+   [:id ms/PositiveInt]
+   [:workspace_merge_id ms/PositiveInt]
+   [:commit_message :string]
+   [:workspace_id [:maybe ms/PositiveInt]]
+   [:workspace_name :string]
+   [:merging_user_id ms/PositiveInt]
+   [:created_at :any]])
+
+(api.macros/defendpoint :get "/:id/merge-history"
+  :- [:sequential MergeHistoryEntry]
+  "Get merge history for a transform. Returns all merge events that affected this transform,
+   ordered by created_at descending (newest first)."
+  [{:keys [id]} :- [:map [:id ms/PositiveInt]]]
+  (api/check-superuser)
+  (api/check-404 (t2/select-one :model/Transform id))
+  (t2/select [:model/WorkspaceMergeTransform
+              :id
+              :workspace_merge_id
+              :commit_message
+              :workspace_id
+              :workspace_name
+              :merging_user_id
+              :created_at]
+             {:where    [:= :transform_id id]
+              :order-by [[:created_at :desc]]}))
+
 ;; TODO (Cam 10/28/25) -- fix this endpoint so it uses kebab-case for query parameters for consistency with the rest
 ;; of the REST API
 ;;
@@ -210,24 +263,10 @@
                                        :limit  (request/limit)))
       (update :data #(map transforms.util/localize-run-timestamps %))))
 
-;; TODO (Cam 2025-11-25) please add a response schema to this API endpoint, it makes it easier for our customers to
-;; use our API + we will need it when we make auto-TypeScript-signature generation happen
-;;
-#_{:clj-kondo/ignore [:metabase/validate-defendpoint-has-response-schema]}
-(api.macros/defendpoint :put "/:id"
-  "Update a transform."
-  [{:keys [id]} :- [:map
-                    [:id ms/PositiveInt]]
-   _query-params
-   body :- [:map
-            [:name {:optional true} :string]
-            [:description {:optional true} [:maybe :string]]
-            [:source {:optional true} ::transforms.schema/transform-source]
-            [:target {:optional true} ::transforms.schema/transform-target]
-            [:run_trigger {:optional true} ::run-trigger]
-            [:tag_ids {:optional true} [:sequential ms/PositiveInt]]
-            [:collection_id {:optional true} [:maybe ms/PositiveInt]]]]
-  (api/check-superuser)
+(defn update-transform!
+  "Update a transform. Validates features, database support, cycles, and target conflicts.
+   Returns the updated transform with hydrated associations."
+  [id body]
   (let [transform (t2/with-transaction [_]
                     ;; Cycle detection should occur within the transaction to avoid race
                     (let [old (t2/select-one :model/Transform id)
@@ -252,6 +291,35 @@
     (events/publish-event! :event/transform-update {:object transform :user-id api/*current-user-id*})
     transform))
 
+;; TODO (Cam 2025-11-25) please add a response schema to this API endpoint, it makes it easier for our customers to
+;; use our API + we will need it when we make auto-TypeScript-signature generation happen
+;;
+#_{:clj-kondo/ignore [:metabase/validate-defendpoint-has-response-schema]}
+(api.macros/defendpoint :put "/:id"
+  "Update a transform."
+  [{:keys [id]} :- [:map
+                    [:id ms/PositiveInt]]
+   _query-params
+   body :- [:map
+            [:name {:optional true} :string]
+            [:description {:optional true} [:maybe :string]]
+            [:source {:optional true} ::transforms.schema/transform-source]
+            [:target {:optional true} ::transforms.schema/transform-target]
+            [:run_trigger {:optional true} ::run-trigger]
+            [:tag_ids {:optional true} [:sequential ms/PositiveInt]]
+            [:collection_id {:optional true} [:maybe ms/PositiveInt]]]]
+  (api/check-superuser)
+  (update-transform! id body))
+
+(defn delete-transform!
+  "Delete a transform and publish the delete event."
+  [transform]
+  (t2/delete! :model/Transform (:id transform))
+  (events/publish-event! :event/transform-delete
+                         {:object transform
+                          :user-id api/*current-user-id*})
+  nil)
+
 ;; TODO (Cam 2025-11-25) please add a response schema to this API endpoint, it makes it easier for our customers to
 ;; use our API + we will need it when we make auto-TypeScript-signature generation happen
 ;;
@@ -261,12 +329,7 @@
   [{:keys [id]} :- [:map
                     [:id ms/PositiveInt]]]
   (api/check-superuser)
-  (let [transform (api/check-404 (t2/select-one :model/Transform id))]
-    (t2/delete! :model/Transform id)
-    (events/publish-event! :event/transform-delete
-                           {:object transform
-                            :user-id api/*current-user-id*}))
-  nil)
+  (delete-transform! (api/check-404 (t2/select-one :model/Transform id))))
 
 ;; TODO (Cam 2025-11-25) please add a response schema to this API endpoint, it makes it easier for our customers to
 ;; use our API + we will need it when we make auto-TypeScript-signature generation happen
@@ -296,18 +359,12 @@
       (transforms.canceling/cancel-run! (:id run))))
   nil)
 
-;; TODO (Cam 2025-11-25) please add a response schema to this API endpoint, it makes it easier for our customers to
-;; use our API + we will need it when we make auto-TypeScript-signature generation happen
-;;
-#_{:clj-kondo/ignore [:metabase/validate-defendpoint-has-response-schema]}
-(api.macros/defendpoint :post "/:id/run"
-  "Run a transform."
-  [{:keys [id]} :- [:map
-                    [:id ms/PositiveInt]]]
-  (api/check-superuser)
-  (let [transform (api/check-404 (t2/select-one :model/Transform id))
-        _         (check-feature-enabled! transform)
-        start-promise (promise)]
+(defn run-transform!
+  "Run a transform. Returns a 202 response with run_id.
+   The transform must already be fetched and validated."
+  [transform]
+  (check-feature-enabled! transform)
+  (let [start-promise (promise)]
     (u.jvm/in-virtual-thread*
      (transforms.execute/execute! transform {:start-promise start-promise
                                              :run-method :manual}))
@@ -320,6 +377,17 @@
                               :run_id run-id})
           (assoc :status 202)))))
 
+;; TODO (Cam 2025-11-25) please add a response schema to this API endpoint, it makes it easier for our customers to
+;; use our API + we will need it when we make auto-TypeScript-signature generation happen
+;;
+#_{:clj-kondo/ignore [:metabase/validate-defendpoint-has-response-schema]}
+(api.macros/defendpoint :post "/:id/run"
+  "Run a transform."
+  [{:keys [id]} :- [:map
+                    [:id ms/PositiveInt]]]
+  (api/check-superuser)
+  (run-transform! (api/check-404 (t2/select-one :model/Transform id))))
+
 (defn- extract-columns-from-query
   "Attempts to extract column names from an MBQL query without executing it.
 

enterprise/backend/src/metabase_enterprise/transforms/core.clj

@@ -1,6 +1,7 @@
 (ns metabase-enterprise.transforms.core
   "API namespace for the `metabase-enterprise.transform` module."
   (:require
+   [metabase-enterprise.transforms.models.transform]
    [metabase-enterprise.transforms.models.transform-run]
    [metabase-enterprise.transforms.settings]
    [metabase-enterprise.transforms.util]
@@ -12,6 +13,9 @@
  [metabase-enterprise.transforms.util
   native-query-transform?
   python-transform?
-  query-transform?]
+  query-transform?
+  transform-source-type]
  [metabase-enterprise.transforms.models.transform-run
-  timeout-run!])
+  timeout-run!]
+ [metabase-enterprise.transforms.models.transform
+  update-transform-tags!])

enterprise/backend/src/metabase_enterprise/transforms/models/transform.clj

@@ -60,7 +60,7 @@
     (collection/check-allowed-content :model/Transform collection_id))
   (assoc transform
          :source_type (transforms.util/transform-source-type source)
-         :target_db_id (or (:database target) (:target_db_id transform))))
+         :target_db_id (or (transforms.i/target-db-id transform) (:database target) (:target_db_id transform))))
 
 (t2/define-before-update :model/Transform
   [{:keys [source target] :as transform}]

enterprise/backend/src/metabase_enterprise/transforms/query_impl.clj

@@ -21,7 +21,9 @@
 (defmethod transforms.i/target-db-id :query
   [transform]
   (or (get-in transform [:target :database])
-      (:target_db_id transform)))
+      (:target_db_id transform)
+      ;; Fallback to source. https://github.com/metabase/metabase/pull/67084#discussion_r2630147855
+      (-> transform :source :query :database)))
 
 (mr/def ::transform-details
   [:map

enterprise/backend/src/metabase_enterprise/transforms/schema.clj

@@ -45,14 +45,14 @@
   [:map
    [:database {:optional true} :int]
    [:type [:= "table"]]
-   [:schema {:optional true} [:or ms/NonBlankString :nil]]
+   [:schema {:optional true} [:maybe ms/NonBlankString]]
    [:name :string]])
 
 (mr/def ::table-incremental-target
   [:map
    [:database {:optional true} :int]
    [:type [:= "table-incremental"]]
-   [:schema {:optional true} [:or ms/NonBlankString :nil]]
+   [:schema {:optional true} [:maybe ms/NonBlankString]]
    [:name :string]
    [:target-incremental-strategy ::target-incremental-strategy]])
 

enterprise/backend/src/metabase_enterprise/transforms/util.clj

@@ -436,33 +436,28 @@
 (defn- matching-timestamp?
   [job field-path {:keys [start end]}]
   (when-let [field-instant (->instant (get-in job field-path))]
-    (let [start-instant (some-> start u.date/parse ->instant)
-          end-instant (some-> end u.date/parse ->instant)]
-      (and (or (nil? start)
-               (not (.isBefore field-instant start-instant)))
-           (or (nil? end)
-               (.isAfter end-instant field-instant))))))
+    (let [parse #(-> % u.date/parse ->instant)]
+      ;; logic here is to find when it's not matching and invert this
+      (not (or (and start (.isBefore field-instant (parse start)))
+               (and end   (.isAfter field-instant (parse end))))))))
 
 (defn ->date-field-filter-xf
   "Returns an xform for a date filter."
   [field-path filter-value]
-  (let [range (some-> filter-value (params.dates/date-string->range {:inclusive-end? false}))]
-    (if range
-      (filter #(matching-timestamp? % field-path range))
-      identity)))
+  (if-let [range (some-> filter-value (params.dates/date-string->range {:inclusive-end? false}))]
+    (filter #(matching-timestamp? % field-path range))
+    identity))
 
 (defn ->status-filter-xf
   "Returns an xform for a transform run status filter."
   [field-path statuses]
-  (let [statuses (->> statuses (map keyword) set not-empty)]
-    (if statuses
-      (filter #(statuses (get-in % field-path)))
-      identity)))
+  (if-let [statuses (->> statuses (map keyword) set not-empty)]
+    (filter #(statuses (get-in % field-path)))
+    identity))
 
 (defn ->tag-filter-xf
   "Returns an xform for a transform tag filter."
   [field-path tag-ids]
-  (let [tag-ids (-> tag-ids set not-empty)]
-    (if tag-ids
-      (filter #(some tag-ids (get-in % field-path)))
-      identity)))
+  (if-let [tag-ids (-> tag-ids set not-empty)]
+    (filter #(some tag-ids (get-in % field-path)))
+    identity))

enterprise/backend/src/metabase_enterprise/transforms_python/execute.clj

@@ -12,6 +12,7 @@
    [metabase.app-db.core :as app-db]
    [metabase.driver :as driver]
    [metabase.driver.util :as driver.u]
+   [metabase.events.core :as events]
    [metabase.util :as u]
    [metabase.util.format :as u.format]
    [metabase.util.i18n :as i18n]
@@ -360,6 +361,7 @@
       (log/info "Executing Python transform" transform-id "with target" (pr-str target))
       (let [start-ms          (u/start-timer)
             transform-details {:db-id          (:id db)
+                               :transform-id   transform-id
                                :transform-type (keyword (:type target))
                                :conn-spec      (driver/connection-spec driver db)
                                :output-schema  (:schema target)
@@ -372,7 +374,8 @@
             result            (transforms.instrumentation/with-stage-timing [run-id [:computation :python-execution]]
                                 (transforms.util/run-cancelable-transform! run-id driver transform-details run-fn :ex-message-fn ex-message-fn))]
         (transforms.instrumentation/with-stage-timing [run-id [:import :table-sync]]
-          (transforms.util/sync-target! target db))
+          (transforms.util/sync-target! target db)
+          (events/publish-event! :event/transform-run-complete {:object transform-details}))
         {:run_id run-id
          :result result}))
     (catch Throwable t

enterprise/backend/src/metabase_enterprise/transforms_python/impl.clj

@@ -10,7 +10,7 @@
 
 (defmethod transforms.i/source-db-id :python
   [transform]
-  (-> transform :source :database))
+  (-> transform :source :source-database))
 
 #_{:clj-kondo/ignore [:discouraged-var]}
 (defmethod transforms.i/execute! :python

enterprise/backend/src/metabase_enterprise/workspaces/api.clj

@@ -0,0 +1,872 @@
+(ns metabase-enterprise.workspaces.api
+  "`/api/ee/workspace/` routes"
+  (:require
+   [clojure.set :as set]
+   [clojure.string :as str]
+   [honey.sql.helpers :as sql.helpers]
+   [metabase-enterprise.transforms.core :as transforms]
+   [metabase-enterprise.transforms.util :as transforms.util]
+   [metabase-enterprise.workspaces.common :as ws.common]
+   [metabase-enterprise.workspaces.impl :as ws.impl]
+   [metabase-enterprise.workspaces.merge :as ws.merge]
+   [metabase-enterprise.workspaces.models.workspace :as ws.model]
+   [metabase-enterprise.workspaces.models.workspace-input-external]
+   [metabase-enterprise.workspaces.models.workspace-log]
+   [metabase-enterprise.workspaces.models.workspace-output-external]
+   [metabase-enterprise.workspaces.types :as ws.t]
+   [metabase-enterprise.workspaces.validation :as ws.validation]
+   [metabase.api.common :as api]
+   [metabase.api.macros :as api.macros]
+   [metabase.api.routes.common :refer [+auth]]
+   [metabase.driver.util :as driver.u]
+   [metabase.lib.core :as lib]
+   [metabase.queries.schema :as queries.schema]
+   [metabase.request.core :as request]
+   [metabase.util :as u]
+   [metabase.util.i18n :as i18n :refer [deferred-tru tru]]
+   [metabase.util.malli.registry :as mr]
+   [metabase.util.malli.schema :as ms]
+   [toucan2.core :as t2]))
+
+(set! *warn-on-reflection* true)
+
+(def ^:private log-limit "Maximum number of recent workspace log items to show" 20)
+
+(mr/def ::appdb-or-ref-id [:or ::ws.t/appdb-id ::ws.t/ref-id])
+
+(mr/def ::status [:enum :uninitialized :pending :ready] #_[:enum :uninitialized :database-not-read :graph-not-ready :ready])
+
+(def ^:private Workspace
+  [:map
+   [:id ::ws.t/appdb-id]
+   [:name :string]
+   [:collection_id ::ws.t/appdb-id]
+   [:database_id ::ws.t/appdb-id]
+   [:status ::status]
+   [:created_at ms/TemporalInstant]
+   [:updated_at ms/TemporalInstant]
+   [:archived_at [:maybe :any]]])
+
+;; Transform-related schemas (adapted from transforms/api.clj)
+;; TODO we should reuse these schemas, by exposing common types from the transforms module. they *can* match exactly.
+
+(mr/def ::transform-source
+  [:multi {:dispatch (comp keyword :type)}
+   [:query
+    [:map
+     [:type [:= "query"]]
+     [:query ::queries.schema/query]]]
+   [:python
+    [:map {:closed true}
+     [:source-database {:optional true} :int]
+     [:source-tables   [:map-of [:string {:min 1}] :int]]
+     [:type [:= "python"]]
+     [:body :string]]]])
+
+(mr/def ::transform-target
+  [:map {:closed true}
+   [:database {:optional true} ::ws.t/appdb-id]
+   [:type [:enum "table"]]
+   [:schema {:optional true} [:maybe [:string {:min 1}]]]
+   [:name [:string {:min 1}]]])
+
+(mr/def ::run-trigger
+  [:enum "none" "global-schedule"])
+
+(defn- check-transforms-enabled!
+  [db-id]
+  (let [database (api/check-400 (t2/select-one :model/Database db-id)
+                                (deferred-tru "The target database cannot be found."))]
+    (api/check (transforms.util/check-feature-enabled nil)
+               [402 (deferred-tru "Premium features required for transforms are not enabled.")])
+    (api/check-400 (not (:is_sample database))
+                   (deferred-tru "Cannot run transforms on the sample database."))
+    (api/check-400 (not (:is_audit database))
+                   (deferred-tru "Cannot run transforms on audit databases."))
+    (api/check-400 (driver.u/supports? (:engine database) :transforms/table database)
+                   (deferred-tru "The database does not support the requested transform target type."))
+    (api/check-400 (not (transforms.util/db-routing-enabled? database))
+                   (deferred-tru "Transforms are not supported on databases with DB routing enabled."))))
+
+(defn- ws->response [ws]
+  (select-keys ws [:id :name :collection_id :database_id :status :created_at :updated_at :archived_at]))
+
+;;; routes
+
+(def ^:private WorkspaceListing
+  [:map {:closed true}
+   [:id ::ws.t/appdb-id]
+   [:database_id ::ws.t/appdb-id]
+   [:name :string]
+   [:archived :boolean]])
+
+(api.macros/defendpoint :get "/" :- [:map {:closed true}
+                                     [:items [:sequential WorkspaceListing]]
+                                     [:limit [:maybe :int]]
+                                     [:offset [:maybe :int]]]
+  "Get a list of all workspaces"
+  [_route-params
+   _query-params]
+  {:items  (t2/select [:model/Workspace :id :name :database_id [[:not= nil :archived_at] :archived]]
+                      (cond-> {:order-by [[:created_at :desc]]}
+                        (request/limit) (sql.helpers/limit (request/limit))
+                        (request/offset) (sql.helpers/offset (request/offset))))
+   :limit  (request/limit)
+   :offset (request/offset)})
+
+(mr/def ::input-table
+  [:map
+   ;; Future-proof with cross-db Python transforms
+   [:db_id ::ws.t/appdb-id]
+   [:schema [:maybe :string]]
+   [:table :string]
+   [:table_id [:maybe ::ws.t/appdb-id]]])
+
+(mr/def ::output-table
+  [:map
+   ;; Future-proof with multi-db Workspaces, plus necessary to resolve table references when id is null.
+   [:db_id ::ws.t/appdb-id]
+   [:global [:map
+             ;; transform_id is nil for workspace outputs, int for external outputs
+             [:transform_id [:maybe ::ws.t/appdb-id]]
+             [:schema [:maybe :string]]
+             [:table :string]
+             [:table_id [:maybe ::ws.t/appdb-id]]]]
+   [:isolated [:map
+               ;; transform_id is ref_id (string) for workspace outputs, int for external outputs
+               [:transform_id [:or ::ws.t/ref-id ::ws.t/appdb-id]]
+               [:schema :string]
+               [:table :string]
+               [:table_id [:maybe ::ws.t/appdb-id]]]]])
+
+(defn- batch-lookup-table-ids
+  "Given a bounded list of tables, all within the same database, return an association list of [db schema table] => id"
+  [db-id schema-key table-key table-refs]
+  (when (seq table-refs)
+    (t2/select-fn-vec (juxt (juxt (constantly db-id) :schema :name) :id)
+                      [:model/Table :id :schema :name]
+                      :db_id db-id
+                      {:where (into [:or] (for [tr table-refs]
+                                            [:and
+                                             [:= :schema (get tr schema-key)]
+                                             [:= :name (get tr table-key)]]))})))
+
+(defn- table-ids-fallbacks
+  "Given a list of maps holding [db_id schema table], return a mapping from those tuples => table_id"
+  [schema-key table-key id-key table-refs]
+  (when-let [table-refs (seq (remove id-key table-refs))]
+    ;; These are ordered by db, so this will partition fine.
+    (u/for-map [table-refs (partition-by :db_id table-refs)
+                :let [db_id (:db_id (first table-refs))]
+                ;; Guesstimating a number that prevents this query being too large.
+                table-refs (partition-all 20 table-refs)
+                map-entry (batch-lookup-table-ids db_id schema-key table-key table-refs)]
+      map-entry)))
+
+(api.macros/defendpoint :get "/:id/table"
+  :- [:map {:closed true}
+      [:inputs [:sequential ::input-table]]
+      [:outputs [:sequential ::output-table]]]
+  "Get workspace tables"
+  [{:keys [id]} :- [:map [:id ms/PositiveInt]]
+   _query-params]
+  (api/check-404 (t2/select-one :model/Workspace :id id))
+  (let [order-by         {:order-by [:db_id :global_schema :global_table]}
+        outputs          (t2/select [:model/WorkspaceOutput
+                                     :db_id :global_schema :global_table :global_table_id
+                                     :isolated_schema :isolated_table :isolated_table_id :ref_id]
+                                    :workspace_id id order-by)
+        external-outputs (t2/select [:model/WorkspaceOutputExternal
+                                     :db_id :global_schema :global_table :global_table_id
+                                     :isolated_schema :isolated_table :isolated_table_id :transform_id]
+                                    :workspace_id id order-by)
+        all-outputs      (concat outputs external-outputs)
+        raw-inputs       (t2/select [:model/WorkspaceInput :db_id :schema :table :table_id]
+                                    :workspace_id id {:order-by [:db_id :schema :table]})
+        external-inputs  (t2/select [:model/WorkspaceInputExternal :db_id :schema :table :table_id]
+                                    :workspace_id id {:order-by [:db_id :schema :table]})
+        all-raw-inputs   (concat raw-inputs external-inputs)
+        ;; Some of our inputs may be shadowed by the outputs of other transforms. We only want external inputs.
+        shadowed?        (into #{} (map (juxt :db_id :global_schema :global_table)) all-outputs)
+        inputs           (remove (comp shadowed? (juxt :db_id :schema :table)) all-raw-inputs)
+        ;; Build a map of [d s t] => id for every table that has been synced since the output row was written.
+        fallback-map     (merge
+                          (table-ids-fallbacks :global_schema :global_table :global_table_id all-outputs)
+                          (table-ids-fallbacks :isolated_schema :isolated_table :isolated_table_id all-outputs))]
+    {:inputs  (sort-by (juxt :db_id :schema :table) inputs)
+     :outputs (sort-by
+               (juxt :db_id (comp (juxt :schema :table) :global))
+               (concat
+                ;; Workspace transform outputs
+                (for [{:keys [ref_id db_id global_schema global_table global_table_id
+                              isolated_schema isolated_table isolated_table_id]} outputs]
+                  {:db_id    db_id
+                   :global   {:transform_id nil
+                              :schema       global_schema
+                              :table        global_table
+                              :table_id     (or global_table_id (get fallback-map [db_id global_schema global_table]))}
+                   :isolated {:transform_id ref_id
+                              :schema       isolated_schema
+                              :table        isolated_table
+                              :table_id     (or isolated_table_id (get fallback-map [db_id isolated_schema isolated_table]))}})
+                ;; External transform outputs
+                (for [{:keys [transform_id db_id global_schema global_table global_table_id
+                              isolated_schema isolated_table isolated_table_id]} external-outputs]
+                  {:db_id    db_id
+                   :global   {:transform_id transform_id
+                              :schema       global_schema
+                              :table        global_table
+                              :table_id     (or global_table_id (get fallback-map [db_id global_schema global_table]))}
+                   :isolated {:transform_id transform_id
+                              :schema       isolated_schema
+                              :table        isolated_table
+                              :table_id     (or isolated_table_id (get fallback-map [db_id isolated_schema isolated_table]))}})))}))
+
+(api.macros/defendpoint :get "/:id" :- Workspace
+  "Get a single workspace by ID"
+  [{:keys [id]} :- [:map [:id ms/PositiveInt]]
+   _query-params]
+  (-> (t2/select-one :model/Workspace :id id) api/check-404 ws->response))
+
+(api.macros/defendpoint :get "/:id/log"
+  :- [:map
+      [:workspace_id ms/PositiveInt]
+      [:status ::status]
+      [:updated_at :any]
+      [:last_completed_at [:maybe :any]]
+      [:logs [:sequential [:map
+                           [:id ms/PositiveInt]
+                           [:task :keyword]
+                           [:description ms/LocalizedString]
+                           [:started_at :any]
+                           [:updated_at :any]
+                           [:completed_at [:maybe :any]]
+                           [:status [:maybe :keyword]]
+                           [:message [:maybe :string]]]]]]
+  "Get workspace creation status and recent log entries for polling during async setup"
+  [{:keys [id]} :- [:map [:id ms/PositiveInt]]
+   _query-params]
+  (let [workspace (api/check-404 (t2/select-one :model/Workspace :id id))
+        logs      (t2/select [:model/WorkspaceLog
+                              :id :task :started_at :completed_at :status :message
+                              :updated_at]
+                             :workspace_id id
+                             {:order-by [[:started_at :desc]]
+                              :limit    log-limit})]
+    {:workspace_id      id
+     :status            (:status workspace)
+     :logs              logs
+     :updated_at        (->> (map :updated_at logs) sort reverse first)
+     :last_completed_at (->> (seq (keep :completed_at logs)) sort reverse first)}))
+
+(def ^:private CreateWorkspace
+  [:map
+   [:name {:optional true} [:string {:min 1}]]
+   [:database_id {:optional true} ::ws.t/appdb-id]])
+
+(defn- first-supported-database-id
+  "Return the ID of the first database that supports workspaces, or nil if none."
+  []
+  (:id
+   (u/seek #(driver.u/supports? (:engine %) :workspace %)
+           (t2/select :model/Database :is_audit false :is_sample false {:order-by [:name]}))))
+
+(api.macros/defendpoint :post "/" :- Workspace
+  "Create a new workspace
+
+  Potential payload:
+  {:name \"a\" :database_id 2}}"
+  [_route-params
+   _query-params
+   {:keys [database_id] :as body} :- CreateWorkspace]
+
+  (when database_id
+    (check-transforms-enabled! database_id))
+
+  ;; If no database_id provided, use first supported DB as provisional default (uninitialized workspace)
+  (let [provisional? (not database_id)
+        database-id  (or database_id
+                         (api/check-400 (first-supported-database-id)
+                                        (tru "No supported databases configured. Please add a database that supports workspaces.")))]
+    (ws->response (ws.common/create-workspace! api/*current-user-id*
+                                               (assoc body
+                                                      :database_id database-id
+                                                      :provisional? provisional?)))))
+
+(defn- db-unsupported-reason [db]
+  (when (not (driver.u/supports? (:engine db) :workspace db))
+    "Database type not supported."))
+
+(api.macros/defendpoint :get "/enabled" :- [:map [:supported :boolean] [:reason {:optional true} :string]]
+  "Test whether the current user can use Workspaces. Optionally takes a specific database.
+   Factors include: driver support, database user privileges, metabase permissions."
+  [_url-params
+   {:keys [database-id]} :- [:map [:database-id {:optional true} ms/PositiveInt]]]
+  (if-let [reason (or (when (not api/*is-superuser?*)
+                        (tru "Not allowed."))
+                      (when database-id
+                        (db-unsupported-reason (api/check-404 (t2/select-one :model/Database database-id)))))]
+    {:supported false, :reason reason}
+    {:supported true}))
+
+(api.macros/defendpoint :get "/database" :- [:map
+                                             [:databases
+                                              [:sequential [:map
+                                                            [:id ms/PositiveInt]
+                                                            [:name :string]
+                                                            [:supported :boolean]
+                                                            [:reason {:optional true} :string]]]]]
+  "Get a list of databases to show in the workspace picker, along with whether they're supported."
+  [_url-params
+   _query-params]
+  {:databases (->> (t2/select :model/Database :is_audit false :is_sample false {:order-by [:name]})
+                   ;; Omit those we don't even support
+                   (filter #(driver.u/supports? (:engine %) :workspace %))
+                   (mapv (fn [db]
+                           (merge (select-keys db [:id :name])
+                                  (if-let [reason (db-unsupported-reason db)]
+                                    {:supported false, :reason reason}
+                                    {:supported true})))))})
+
+(api.macros/defendpoint :put "/:id" :- Workspace
+  "Update simple workspace properties.
+
+  Can set database_id only on uninitialized workspaces."
+  [{:keys [id]} :- [:map [:id ms/PositiveInt]]
+   _query-params
+   {:keys [name database_id]} :- [:map {:closed true}
+                                  [:name {:optional true} [:string {:min 1}]]
+                                  [:database_id {:optional true} ::ws.t/appdb-id]]]
+  (let [workspace (api/check-404 (t2/select-one :model/Workspace :id id))
+        _         (api/check-400 (nil? (:archived_at workspace)) "Cannot update an archived workspace")
+        data      (cond-> {}
+                    database_id (-> (u/prog1
+                                      (api/check-400 (= :uninitialized (:status workspace))
+                                                     "Can only set database_id on uninitialized workspace")
+                                      (check-transforms-enabled! database_id))
+                                    (assoc :database_id database_id))
+                    name        (assoc :name name))]
+    (ws->response
+     (if (seq data)
+       (do
+         (t2/update! :model/Workspace id data)
+         (t2/select-one :model/Workspace :id id))
+       workspace))))
+
+(api.macros/defendpoint :post "/:id/archive" :- Workspace
+  "Archive a workspace. Deletes the isolated schema and tables, but preserves mirrored entities."
+  [{:keys [id]} :- [:map [:id ms/PositiveInt]]
+   _query-params
+   _body-params]
+  (let [ws (api/check-404 (t2/select-one :model/Workspace :id id))]
+    (api/check-400 (nil? (:archived_at ws)) "You cannot archive an archived workspace")
+    (ws.model/archive! ws)
+    (-> (t2/select-one :model/Workspace :id id)
+        ws->response)))
+
+(api.macros/defendpoint :post "/:id/unarchive" :- Workspace
+  "Restore an archived workspace. Recreates the isolated schema and tables."
+  [{:keys [id]} :- [:map [:id ms/PositiveInt]]
+   _query-params
+   _body-params]
+  (let [ws (api/check-404 (t2/select-one :model/Workspace :id id))]
+    (api/check-400 (some? (:archived_at ws)) "You cannot unarchive a workspace that is not archived")
+    (ws.model/unarchive! ws)
+    (-> (t2/select-one :model/Workspace :id id)
+        ws->response)))
+
+(api.macros/defendpoint :delete "/:ws-id" :- [:map [:ok [:= true]]]
+  "Delete a workspace and all its contents, including mirrored entities."
+  [{:keys [ws-id]} :- [:map [:ws-id ms/PositiveInt]]
+   _query-params]
+  (let [ws (api/check-404 (t2/select-one :model/Workspace :id ws-id))]
+    (api/check-400 (some? (:archived_at ws)) "You cannot delete a workspace without first archiving it")
+    (ws.model/delete! ws)
+    {:ok true}))
+
+(def ^:private ExternalTransform
+  ;; Might be interesting to show whether they're enclosed, once we have the graph.
+  ;; When they're enclosed, it could also be interesting to know whether they're stale.
+  [:map
+   [:id ::ws.t/appdb-id]
+   [:name :string]
+   [:source_type :keyword]
+   [:checkout_disabled [:maybe :string]]])
+
+(api.macros/defendpoint :get "/:ws-id/external/transform" :- [:map [:transforms [:sequential ExternalTransform]]]
+  "Get transforms that are external to the workspace, i.e. no matching workspace_transform row exists."
+  [{:keys [ws-id]} :- [:map [:ws-id ::ws.t/appdb-id]]
+   {:keys [database-id]} :- [:map [:database-id {:optional true} ::ws.t/appdb-id]]]
+  (api/check-superuser)
+  (let [db-id      (or database-id
+                       (:database_id (api/check-404 (t2/select-one [:model/Workspace :database_id] ws-id))))
+        transforms (t2/select [:model/Transform :id :name :source_type :source]
+                              {:left-join [[:workspace_transform :wt]
+                                           [:and
+                                            [:= :transform.id :wt.global_id]
+                                            [:= :wt.workspace_id ws-id]]]
+                               ;; NULL workspace_id means transform is not checked out into this workspace
+                               :where     [:and
+                                           [:= nil :wt.workspace_id]
+                                           [:= :target_db_id db-id]]
+                               :order-by  [[:id :asc]]})]
+    {:transforms
+     (into []
+           (map #(-> %
+                     (dissoc :source)
+                     (assoc :checkout_disabled (case (:source_type %)
+                                                 :mbql   "mbql"
+                                                 :native (when (seq (lib/template-tags-referenced-cards (:query (:source %))))
+                                                           "card-reference")
+                                                 :python nil
+                                                 "unknown-type"))))
+           ;; (Sanya 2025-12-24) - do we need this line?
+           #_(map #(update % :last_run transforms.util/localize-run-timestamps))
+           transforms
+           ;; Perhaps we want to expose some of this later?
+           #_(t2/hydrate transforms :last_run :creator))}))
+
+(api.macros/defendpoint :post "/:ws-id/run"
+  :- [:map
+      [:succeeded [:sequential ::ws.t/ref-id]]
+      [:failed [:sequential ::ws.t/ref-id]]
+      [:not_run [:sequential ::ws.t/ref-id]]]
+  "Execute all transforms in the workspace in dependency order.
+   Returns which transforms succeeded, failed, and were not run."
+  [{:keys [ws-id]} :- [:map [:ws-id ::ws.t/appdb-id]]
+   _query-params
+   ;; Hmmm, I wonder why this isn't a boolean? T_T
+   {:keys [stale_only]} :- [:map [:stale_only {:optional true} [:or [:= 1] :boolean]]]]
+  (let [workspace (t2/select-one :model/Workspace :id ws-id)]
+    (api/check-404 workspace)
+    (api/check-400 (nil? (:archived_at workspace)) "Cannot execute archived workspace")
+    (ws.impl/execute-workspace! workspace {:stale-only stale_only})))
+
+(mr/def ::graph-node-type [:enum :input-table :external-transform :workspace-transform])
+
+(mr/def ::graph-node
+  [:map
+   [:id ::appdb-or-ref-id]
+   [:type [:enum :input-table :external-transform :workspace-transform]]
+   [:dependents_count [:map-of ::graph-node-type ms/PositiveInt]]
+   [:data :map]])
+
+(mr/def ::graph-edge
+  [:map
+   [:from_entity_id ::appdb-or-ref-id]
+   [:from_entity_type :string]
+   [:to_entity_id ::appdb-or-ref-id]
+   [:to_entity_type :string]])
+
+(def ^:private GraphResult
+  [:map
+   [:nodes [:sequential ::graph-node]]
+   [:edges [:sequential ::graph-edge]]])
+
+(defn- node-type [node]
+  (let [nt (:node-type node)]
+    (case nt
+      :table :input-table
+      nt)))
+
+(defn- node-id [{:keys [node-type id]}]
+  (case node-type
+    :workspace-transform id
+    :external-transform id
+    :table (str (:db id) "-" (:schema id) "-" (:table id))))
+
+;; TODO we'll want to bulk query this of course...
+(defn- node-data [{:keys [node-type id]}]
+  (case node-type
+    :table id
+    :external-transform (t2/select-one [:model/Transform :id :name] id)
+    ;; TODO we'll want to select by workspace as well here, to relax uniqueness assumption
+    :workspace-transform (t2/select-one [:model/WorkspaceTransform :ref_id :name] :ref_id id)))
+
+(api.macros/defendpoint :get "/:ws-id/graph" :- GraphResult
+  "Display the dependency graph between the Changeset and the (potentially external) entities that they depend on."
+  [{:keys [ws-id]} :- [:map [:ws-id ms/PositiveInt]]
+   _query-params]
+  (let [workspace (api/check-404 (t2/select-one :model/Workspace :id ws-id))
+        {:keys [inputs entities dependencies]} (ws.impl/get-or-calculate-graph workspace)
+        ;; TODO Graph analysis doesn't return this currently, we need to invert the deps graph
+        ;;      It could be cheaper to build it as we go.
+        inverted (reduce
+                  (fn [inv [c parents]]
+                    (reduce (fn [inv p] (update inv p (fnil conj #{}) c)) inv parents))
+                  {}
+                  dependencies)
+        dep-count #(frequencies (map node-type (get inverted %)))]
+
+    {:nodes (concat (for [i inputs]
+                      {:type             :input-table
+                       ;; Use an id that's independent of whether the table exists yet.
+                       :id               (node-id {:id i, :node-type :table})
+                       :data             i
+                       :dependents_count (dep-count {:node-type :table, :id i})})
+                    (for [e entities]
+                      {:type             (node-type e)
+                       :id               (:id e)
+                       :data             (node-data e)
+                       :dependents_count (dep-count e)}))
+     :edges (for [[child parents] dependencies, parent parents]
+              ;; Yeah, this graph points to dependents, not dependencies
+              {:from_entity_type (name (node-type parent))
+               :from_entity_id   (node-id parent)
+               :to_entity_type   (name (node-type child))
+               :to_entity_id     (node-id child)})}))
+
+;;; ---------------------------------------- Problems/Validation ----------------------------------------
+
+(api.macros/defendpoint :get "/:id/problem" :- [:sequential ::ws.t/problem]
+  "Detect problems in the workspace that would affect downstream transforms after merge.
+
+   Returns a list of problems, each with:
+   - category:    the problem category (e.g. 'unused', 'internal-downstream', 'external-downstream')
+   - problem:     the specific problem (e.g. 'not-run', 'stale', 'removed-field')
+   - severity:    :error, :warning, or :info
+   - block-merge: whether this problem prevents merging
+   - data:        extra information, shape depends on the problem type
+
+   See `metabase-enterprise.workspaces.types/problem-types` for the full list."
+  [{:keys [id]} :- [:map [:id ms/PositiveInt]]
+   _query-params]
+  (let [workspace (api/check-404 (t2/select-one :model/Workspace :id id))
+        graph     (ws.impl/get-or-calculate-graph workspace)]
+    (ws.validation/find-downstream-problems id graph)))
+
+(def ^:private db+schema+table (juxt :database :schema :name))
+
+(defn- internal-target-conflict?
+  "Check whether the given table is the target of another transform within the workspace. Ignores global transforms."
+  [ws-id target & [tx-id]]
+  (contains?
+   (t2/select-fn-set (comp db+schema+table :target)
+                     [:model/WorkspaceTransform :target]
+                     :ref_id [:not= tx-id]
+                     :workspace_id ws-id)
+   (db+schema+table target)))
+
+(api.macros/defendpoint :post "/:ws-id/transform/validate/target"
+  :- [:map [:status :int] [:body [:or :string i18n/LocalizedString]]]
+  "Validate the target table for a workspace transform"
+  [{:keys [ws-id]} :- [:map [:ws-id ::ws.t/appdb-id]]
+   {:keys [transform-id]} :- [:map [:transform-id {:optional true} ::ws.t/ref-id]]
+   {:keys [db_id target]} :- [:map
+                              [:db_id {:optional true} ::ws.t/appdb-id]
+                              [:target [:map
+                                        [:database {:optional true} ::ws.t/appdb-id]
+                                        [:type :string]
+                                        [:schema :string]
+                                        [:name :string]]]]]
+  (let [workspace (api/check-404 (t2/select-one [:model/Workspace :database_id :status] ws-id))
+        target    (update target :database #(or % db_id))
+        tx-id     (when transform-id (parse-long transform-id))
+        ;; For uninitialized workspaces we skip over checks for their db id
+        ws-db-id  (when (not= :uninitialized (:status workspace)) (:database_id workspace))]
+    (cond
+      (not= "table" (:type target))
+      {:status 403 :body (deferred-tru "Unsupported target type")}
+
+      (and db_id ws-db-id (not= db_id ws-db-id))
+      {:status 403 :body (deferred-tru "Must target the workspace database")}
+
+      (not (or db_id ws-db-id))
+      {:status 403 :body (deferred-tru "Must target a database")}
+
+      (str/starts-with? (:schema target) "mb__isolation_")
+      {:status 403 :body (deferred-tru "Must not target an isolated workspace schema")}
+
+      ;; Within a workspace, we defer blocking on conflicts outside the workspace
+      #_{:status 403 :body (deferred-tru "A table with that name already exists.")}
+
+      ;; TODO consider deferring this validation until merge also.
+      (internal-target-conflict? ws-id target tx-id)
+      {:status 403 :body (deferred-tru "Another transform in this workspace already targets that table")}
+
+      :else
+      {:status 200 :body "OK"})))
+
+(defn- malli-map-keys [schema]
+  (into [] (map first) (rest schema)))
+
+(defn- select-malli-keys
+  "Like select-keys, but with the arguments reversed, and taking the malli schema for the output map.
+   Nothing smart - for example, it doesn't understand optional verus maybe."
+  ([schema m]
+   (select-keys m (malli-map-keys schema)))
+  ([schema alias-map m]
+   (merge (select-malli-keys schema m)
+          (u/for-map [[to from] alias-map] [to (from m)]))))
+
+(defn- select-model-malli-keys
+  "Build the model-fields vector for a t2/select from a malli schema for the output row(s)"
+  ([model schema]
+   (into [model] (malli-map-keys schema)))
+  ([model schema alias-map]
+   (into [model]
+         (map (fn [to] (if-let [from (to alias-map)] [from to] to)))
+         (malli-map-keys schema))))
+
+(def ^:private WorkspaceTransform
+  [:map
+   [:ref_id ::ws.t/ref-id]
+   [:global_id [:maybe ::ws.t/appdb-id]]
+   [:name :string]
+   [:description [:maybe :string]]
+   [:source :map]
+   [:target :map]
+   ;; Not yet calculated, see https://linear.app/metabase/issue/BOT-684/mark-stale-transforms-workspace-only
+   [:target_stale :boolean]
+   [:workspace_id ::ws.t/appdb-id]
+   [:creator_id [:maybe ::ws.t/appdb-id]]
+   [:archived_at :any]
+   [:created_at :any]
+   [:updated_at :any]
+   [:last_run_at :any]
+   [:last_run_message [:maybe :string]]])
+
+(def ^:private workspace-transform-alias {:target_stale :stale})
+
+(api.macros/defendpoint :post "/:id/transform"
+  :- WorkspaceTransform
+  "Add another transform to the Changeset. This could be a fork of an existing global transform, or something new."
+  [{:keys [id]} :- [:map [:id ::ws.t/appdb-id]]
+   _query-params
+   body :- [:map #_{:closed true}
+            [:name :string]
+            [:description {:optional true} [:maybe :string]]
+            [:source ::transform-source]
+            ;; Not sure why this schema is giving trouble
+            #_[:target ::transform-target]]]
+  (api/check (transforms.util/check-feature-enabled body)
+             [402 (deferred-tru "Premium features required for this transform type are not enabled.")])
+  (t2/with-transaction [_tx]
+    (let [workspace (u/prog1 (api/check-404 (t2/select-one :model/Workspace :id id))
+                      (api/check-400 (nil? (:archived_at <>)) "Cannot create transforms in an archived workspace"))
+          ;; TODO why 400 here and 403 in the validation route? T_T
+          _         (api/check-400 (not (internal-target-conflict? id (:target body)))
+                                   (deferred-tru "Another transform in this workspace already targets that table"))
+          global-id (:global_id body (:id body))
+          ;; For uninitialized workspaces, preserve the target database from the request body
+          ;; (add-to-changeset! will reinitialize the workspace with it if different from provisional)
+          ;; For initialized workspaces, ensure the target database matches the workspace's database
+          body      (-> body (dissoc :global_id)
+                        (cond-> (not= :uninitialized (:status workspace))
+                          (update :target assoc :database (:database_id workspace))))
+          transform (ws.common/add-to-changeset! api/*current-user-id* workspace :transform global-id body)]
+      (select-malli-keys WorkspaceTransform workspace-transform-alias transform))))
+
+;; TODO Confirm precisely which fields are needed by the FE
+(def ^:private WorkspaceTransformListing
+  "Schema for a transform in a workspace"
+  [:map {:closed true}
+   [:ref_id ::ws.t/ref-id]
+   [:global_id [:maybe ::ws.t/appdb-id]]
+   [:name :string]
+   [:source_type [:maybe :keyword]]
+   [:creator_id [:maybe ::ws.t/appdb-id]]
+   ;[:last_run :map]
+   ; See https://metaboat.slack.com/archives/C099RKNLP6U/p1765205882655869?thread_ts=1765205222.888209&cid=C099RKNLP6U
+   #_[:target_stale :boolean]])
+
+;; Global transforms precalculate these in a toucan hook - maybe we should do that too? Let's review later.
+(defn- map-source-type [ws-tx]
+  (-> ws-tx
+      (assoc :source_type (transforms/transform-source-type (:source ws-tx)))
+      (dissoc :source)))
+
+(api.macros/defendpoint :get "/:id/transform" :- [:map [:transforms [:sequential WorkspaceTransformListing]]]
+  "Get all transforms in a workspace."
+  [{:keys [id]} :- [:map [:id ::ws.t/appdb-id]]]
+  (api/check-404 (t2/select-one :model/Workspace :id id))
+  {:transforms (->> (t2/select [:model/WorkspaceTransform :ref_id :global_id :name :source :creator_id]
+                               :workspace_id id {:order-by [:created_at]})
+                    (map map-source-type))})
+
+(defn- fetch-ws-transform [ws-id tx-id]
+  ;; TODO We still need to do some hydration, e.g. of the target table (both internal and external)
+  (-> (select-model-malli-keys :model/WorkspaceTransform WorkspaceTransform workspace-transform-alias)
+      (t2/select-one :ref_id tx-id :workspace_id ws-id)
+      api/check-404))
+
+(api.macros/defendpoint :get "/:id/transform/:tx-id" :- WorkspaceTransform
+  "Get a specific transform in a workspace."
+  [{:keys [id tx-id]} :- [:map [:id ::ws.t/appdb-id] [:tx-id ::ws.t/ref-id]]]
+  (fetch-ws-transform id tx-id))
+
+(api.macros/defendpoint :put "/:ws-id/transform/:tx-id" :- WorkspaceTransform
+  "Update a transform in a workspace."
+  [{:keys [ws-id tx-id]} :- [:map [:ws-id ::ws.t/appdb-id] [:tx-id ::ws.t/ref-id]]
+   _query-params
+   body :- [:map
+            [:name {:optional true} :string]
+            [:description {:optional true} [:maybe :string]]
+            [:source {:optional true} ::transform-source]
+            [:target {:optional true} ::transform-target]]]
+  (t2/with-transaction [_tx]
+    (api/check-404 (t2/select-one :model/WorkspaceTransform :ref_id tx-id :workspace_id ws-id))
+    (t2/update! :model/WorkspaceTransform tx-id body)
+    ;; Being cheeky and using the API response value for the pre-validation, to save a query.
+    (u/prog1 (fetch-ws-transform ws-id tx-id)
+      ;; NOTE: FE may send these fields even when unchanged, causing unnecessary re-syncs.
+      ;; This is acceptable for now, but using t2/changes in hooks might catch false positives?
+      ;; The most reliable thing would be to have a clear, tested contract with the FE to NOT send them if unchanged.
+      (when (or (:source body) (:target body))
+        ;; Note that we do NOT want to couple ourselves to the response shape of this API.
+        ;; We want to be extremely mindful of the fields we depend on, in case we remove them from the response.
+        (let [transform (select-keys <> [:ref_id :source :source_type :target])
+              workspace (t2/select-one :model/Workspace :id ws-id)]
+          ;; Re-sync dependencies if source or target changed.
+          (ws.impl/sync-transform-dependencies! workspace transform))))))
+
+(api.macros/defendpoint :post "/:id/transform/:tx-id/archive" :- :nil
+  "Mark the given transform to be archived when the workspace is merged.
+   For provisional transforms we will skip even creating it in the first place."
+  [{:keys [id tx-id]} :- [:map [:id ::ws.t/appdb-id] [:tx-id ::ws.t/ref-id]]]
+  (api/check-404 (pos? (t2/update! :model/WorkspaceTransform {:ref_id tx-id :workspace_id id} {:archived_at [:now]})))
+  nil)
+
+(api.macros/defendpoint :post "/:id/transform/:tx-id/unarchive" :- :nil
+  "Unmark the given transform for archival. This will recall the last definition it had within the workspace."
+  [{:keys [id tx-id]} :- [:map [:id ::ws.t/appdb-id] [:tx-id ::ws.t/ref-id]]]
+  (api/check-404 (pos? (t2/update! :model/WorkspaceTransform {:ref_id tx-id :workspace_id id} {:archived_at nil})))
+  nil)
+
+(api.macros/defendpoint :delete "/:id/transform/:tx-id" :- :nil
+  "Discard a transform from the changeset.
+   Equivalent to resetting a checked-out transform to its global definition, or deleting a provisional transform."
+  [{:keys [id tx-id]} :- [:map [:id ::ws.t/appdb-id] [:tx-id ::ws.t/ref-id]]]
+  (api/check-404 (pos? (t2/delete! :model/WorkspaceTransform :ref_id tx-id :workspace_id id)))
+  nil)
+
+(api.macros/defendpoint :post "/:id/transform/:tx-id/run"
+  :- ::ws.t/execution-result
+  "Run a transform in a workspace.
+
+  App DB changes are rolled back. Warehouse DB changes persist."
+  [{:keys [id tx-id]} :- [:map [:id ::ws.t/appdb-id] [:tx-id ::ws.t/ref-id]]]
+  (let [workspace  (api/check-404 (t2/select-one :model/Workspace id))
+        transform  (api/check-404 (t2/select-one :model/WorkspaceTransform :ref_id tx-id :workspace_id id))]
+    (api/check-400 (nil? (:archived_at workspace)) "Cannot execute archived workspace")
+    (check-transforms-enabled! (:database_id workspace))
+    (ws.impl/run-transform! workspace transform)))
+
+#_{:clj-kondo/ignore [:metabase/validate-defendpoint-route-uses-kebab-case]}
+(api.macros/defendpoint :get "/checkout"
+  :- [:map
+      [:transforms [:sequential
+                    [:map
+                     [:id ::ws.t/ref-id]
+                     [:name :string]
+                     [:workspace [:map
+                                  [:id ms/PositiveInt]
+                                  [:name :string]]]]]]]
+  "Get all downstream transforms for a transform that is not in a workspace.
+   Returns the transforms that were mirrored from this upstream transform, with workspace info."
+  [_route-params
+   {:keys [transform-id]} :- [:map {:closed true} [:transform-id ms/PositiveInt]]]
+  (let [transforms       (t2/select [:model/WorkspaceTransform :ref_id :name :workspace_id] :global_id transform-id)
+        workspace-ids    (map :workspace_id transforms)
+        workspaces-by-id (when (seq transforms)
+                           (t2/select-fn->fn :id identity [:model/Workspace :id :name] :id [:in workspace-ids]))]
+    {:transforms (for [{:keys [ref_id name workspace_id]} transforms]
+                   {:id        ref_id
+                    :name      name
+                    :workspace (get workspaces-by-id workspace_id)})}))
+
+(api.macros/defendpoint :post "/:ws-id/merge"
+  :- [:or
+      [:map
+       [:merged
+        [:map
+         [:transforms [:sequential
+                       [:map
+                        [:op [:enum :create :delete :update :noop]]
+                        [:global_id {:optional true} [:maybe ::ws.t/appdb-id]]
+                        [:ref_id ::ws.t/ref-id]]]]]]
+       [:errors
+        [:sequential
+         [:map
+          [:op [:enum :create :delete :update :noop]]
+          [:global_id {:optional true} [:maybe ::ws.t/appdb-id]]
+          [:ref_id ::ws.t/ref-id]]]]
+       [:workspace [:map [:id ::ws.t/appdb-id] [:name :string]]]
+       [:archived_at [:maybe :any]]]
+      ;; error message from check-404 or check-400
+      :string]
+  "This will:
+   1. Update original transforms with workspace versions
+   2. Delete the workspace and clean up isolated resources
+   Returns a report of merged entities, or error in errors key.
+
+   Request body may include:
+   - commit-message: A description of what changes are being merged (optional, will be required in future)"
+  [{:keys [ws-id] :as _query-params} :- [:map [:ws-id ::ws.t/appdb-id]]
+   _query-params
+   {:keys [commit-message]
+    :or   {commit-message "Placeholder for merge commit message. Should be required on FE"}} :- [:map
+                                                                                                 [:commit-message {:optional true} [:string {:min 1}]]]]
+  (let [ws               (u/prog1 (t2/select-one :model/Workspace :id ws-id)
+                           (api/check-404 <>)
+                           (api/check-400 (nil? (:archived_at <>)) "Cannot merge an archived workspace"))
+        {:keys [merged
+                errors]} (-> (ws.merge/merge-workspace! ws api/*current-user-id* commit-message)
+                             (update :errors
+                                     (partial mapv #(-> %
+                                                        (update :error (fn [e] (.getMessage ^Throwable e)))
+                                                        (set/rename-keys {:error :message})))))]
+    (u/prog1
+      {:merged      merged
+       :errors      errors
+       :workspace   {:id ws-id, :name (:name ws)}
+       :archived_at (when-not (seq errors)
+                      ;; TODO call a ws.common method, which can handle the clean-up too
+                      (t2/update! :model/Workspace :id ws-id {:archived_at [:now]})
+                      (t2/select-one-fn :archived_at [:model/Workspace :archived_at] :id ws-id))}
+      (when-not (seq errors)
+        ;; Most of the APIs and the FE are not respecting when a Workspace is archived yet.
+        (ws.model/delete! ws)))))
+
+(api.macros/defendpoint :post "/:ws-id/transform/:tx-id/merge"
+  :- [:map
+      [:op [:enum :create :delete :update :noop]]
+      [:global_id [:maybe ::ws.t/appdb-id]]
+      [:ref_id ::ws.t/ref-id]
+      [:message {:optional true} :string]]
+  "Merge single transform from workspace back to the core. If workspace transform is archived
+  the corresponding core transform is deleted.
+
+   Request body may include:
+   - commit-message: A description of what changes are being merged (optional, will be required in future)"
+  [{:keys [ws-id tx-id] :as _query-params} :- [:map
+                                               [:ws-id ::ws.t/appdb-id]
+                                               [:tx-id ::ws.t/ref-id]]
+   _query-params
+   {:keys [commit-message]
+    :or   {commit-message "Placeholder for merge commit message. Should be required on FE"}} :- [:map
+                                                                                                 [:commit-message {:optional true} [:string {:min 1}]]]]
+  (let [ws              (api/check-404 (t2/select-one [:model/Workspace :id :name] :id ws-id))
+        ws-transform    (api/check-404 (t2/select-one :model/WorkspaceTransform :workspace_id ws-id :ref_id tx-id))
+        ws-merge-id     (t2/insert-returning-pk!
+                         :model/WorkspaceMerge
+                         {:workspace_id   (:id ws)
+                          :workspace_name (:name ws)
+                          :commit_message commit-message
+                          :creator_id     api/*current-user-id*})
+        {:keys [error] :as result} (ws.merge/merge-transform! {:ws-transform       ws-transform
+                                                               :workspace          ws
+                                                               :workspace-merge-id ws-merge-id
+                                                               :merging-user-id    api/*current-user-id*
+                                                               :commit-message     commit-message})]
+    (if error
+      (throw (ex-info "Failed to merge transform."
+                      (-> result
+                          (dissoc :error)
+                          (assoc :status-code 500))
+                      error))
+      result)))
+
+(def ^{:arglists '([request respond raise])} routes
+  "`/api/ee/workspace/` routes."
+  (api.macros/ns-handler *ns* api/+check-superuser +auth))

enterprise/backend/src/metabase_enterprise/workspaces/common.clj

@@ -0,0 +1,183 @@
+(ns metabase-enterprise.workspaces.common
+  (:require
+   [clojure.string :as str]
+   [metabase-enterprise.workspaces.dag :as ws.dag]
+   [metabase-enterprise.workspaces.impl :as ws.impl]
+   [metabase-enterprise.workspaces.isolation :as ws.isolation]
+   [metabase-enterprise.workspaces.models.workspace-log :as ws.log]
+   [metabase-enterprise.workspaces.util :as ws.u]
+   [metabase.api-keys.core :as api-key]
+   [metabase.api.common :as api]
+   [metabase.util :as u]
+   [metabase.util.log :as log]
+   [metabase.util.quick-task :as quick-task]
+   [toucan2.core :as t2]))
+
+;; should be encapsulated in our dag namespace, or dependency module
+(defn check-no-card-dependencies!
+  "Check that transforms don't depend on cards. Throws 400 if they do."
+  [transform-ids]
+  (when-let [card-ids (seq (ws.dag/unsupported-dependency? transform-ids))]
+    (api/check-400 false
+                   (format "Cannot add transforms that depend on saved questions (cards). Found dependencies on card IDs: %s"
+                           (pr-str (vec card-ids))))))
+
+(defn- extract-suffix-number
+  "Extract the numeric suffix from a workspace name like 'Foo (3)', or nil if no valid suffix."
+  [ws-name base-name]
+  (when (= (str/replace ws-name #"\s*\(\d+\)$" "") base-name)
+    (when-let [[_ n] (re-find #"\((\d+)\)$" ws-name)]
+      (parse-long n))))
+
+(defn- generate-unique-workspace-name
+  "Generate a unique workspace name by appending (N) if the name already exists.
+
+  Strategy:
+  1. If the base name doesn't exist, use it as-is
+  2. If it exists, strip any existing (N) suffix and find the highest N among similar names
+  3. Return the base name with (N+1) appended
+
+  Note: This function has a potential race condition between checking existence and insertion.
+  Callers should handle unique constraint violations by retrying."
+  [base-name]
+  (when (str/blank? base-name)
+    (throw (ex-info "Workspace name cannot be empty" {:status-code 400})))
+  (if-not (t2/exists? :model/Workspace :name base-name)
+    base-name
+    (let [stripped-name (str/replace base-name #"\s*\(\d+\)$" "")
+          existing      (t2/select-fn-set :name :model/Workspace
+                                          :name [:like (str stripped-name " (%)")])
+          numbers       (keep #(extract-suffix-number % stripped-name) existing)
+          next-num      (inc (apply max 0 numbers))]
+      (str stripped-name " (" next-num ")"))))
+
+;; TODO: Generate new metabase user for the workspace
+;; TODO: Should we move this to model as per the diagram?
+(defn- create-workspace-container!
+  "Create the workspace and its related collection, user, and api key."
+  [creator-id db-id workspace-name status]
+  ;; TODO (Chris 2025-11-19) Unsure API key name is unique, and remove this (insecure) workaround.
+  (let [api-key (let [key-name (format "API key for Workspace %s" workspace-name)]
+                  (or (t2/select-one :model/ApiKey :name key-name)
+                      (api-key/create-api-key-with-new-user! {:key-name key-name})))
+        ;; TODO (Chris 2025-11-19) Associate the api-key user with the workspace as well.
+        ws      (t2/insert-returning-instance! :model/Workspace
+                                               {:name           workspace-name
+                                                :creator_id     creator-id
+                                                :database_id    db-id
+                                                :api_key_id     (:id api-key)
+                                                :execution_user (:user_id api-key)
+                                                :status         status})
+        coll    (t2/insert-returning-instance! :model/Collection
+                                               {:name         (format "Collection for Workspace %s" workspace-name)
+                                                :namespace    "workspace"
+                                                :workspace_id (:id ws)})
+        ;; Only set schema for initialized workspaces (not uninitialized)
+        schema  (when (not= status :uninitialized) (ws.u/isolation-namespace-name ws))
+        ws      (assoc ws
+                       :collection_id (:id coll)
+                       :schema schema)]
+    ;; Set the backlink from the workspace to the collection inside it and set the schema.
+    (t2/update! :model/Workspace (:id ws) (cond-> {:collection_id (:id coll)}
+                                            schema (assoc :schema schema)))
+    ;; TODO (Sanya 2025-11-18) - not sure how to transfer this api key to agent
+    #_(log/infof "Generated API key for workspace: %s" (u.secret/expose (:unmasked_key api-key)))
+    ws))
+
+(defn- unique-constraint-violation?
+  "Check if an exception is due to a unique constraint violation."
+  [e]
+  (let [msg (str (ex-message e) (some-> (ex-cause e) ex-message))]
+    (or (str/includes? msg "unique")
+        (str/includes? msg "duplicate")
+        (str/includes? msg "UNIQUE"))))
+
+(defn- run-workspace-setup!
+  "Background job: runs isolation, grants. Updates status to :ready when done."
+  [{ws-id :id :as workspace} database]
+  (try
+    (ws.log/track! ws-id :workspace-setup
+      (let [isolation-details (ws.log/track! ws-id :database-isolation
+                                (ws.isolation/ensure-database-isolation! workspace database))]
+        (t2/update! :model/Workspace ws-id (merge (select-keys isolation-details [:schema :database_details])
+                                                  {:status :ready}))))
+    (catch Exception e
+      (log/error e "Failed to setup workspace")
+      (throw e))))
+
+(defn initialize-workspace!
+  "Initialize an uninitialized workspace with the given database_id.
+   Updates database_id (if different from provisional), sets schema, creates isolation resources async,
+   and transitions to :pending status. Returns the updated workspace with schema set."
+  [workspace database-id]
+  (let [database (t2/select-one :model/Database :id database-id)
+        schema   (ws.u/isolation-namespace-name workspace)
+        res      (t2/update! :model/Workspace {:id     (:id workspace)
+                                               :status :uninitialized}
+                             {:database_id database-id
+                              :schema      schema
+                              :status      :pending})]
+    (when (zero? res)
+      (let [new-db-id (t2/select-one-fn :database_id :model/Workspace (:id workspace))]
+        (when (not= database-id new-db-id)
+          (throw (ex-info "Workspace has been initialized already with a different database"
+                          {:requested-db-id database-id
+                           :actual-db-id    new-db-id})))))
+    (u/prog1 (t2/select-one :model/Workspace :id (:id workspace))
+      (quick-task/submit-task! #(run-workspace-setup! <> database)))))
+
+(defn- create-uninitialized-workspace!
+  "Create a workspace with a provisional database_id but no isolation resources.
+   Retries on unique constraint violations for workspace name."
+  [creator-id db-id ws-name max-retries]
+  (loop [attempt 1]
+    (let [unique-name         (generate-unique-workspace-name ws-name)
+          {:keys [retry
+                  workspace]} (try
+                                {:workspace (create-workspace-container! creator-id db-id unique-name :uninitialized)}
+                                (catch Exception e
+                                  (if (and (< attempt max-retries) (unique-constraint-violation? e))
+                                    {:retry true}
+                                    (throw e))))]
+      (if retry
+        (recur (inc attempt))
+        workspace))))
+
+;; TODO internal: test!
+(defn create-workspace!
+  "Create workspace. If :provisional is true, creates an uninitialized workspace with a
+   provisional database_id (no isolation resources yet). Otherwise creates a pending
+   workspace and kicks off async setup."
+  [creator-id {ws-name-maybe :name
+               db-id         :database_id
+               provisional?  :provisional?}]
+  (let [ws-name (or ws-name-maybe (ws.u/generate-name))
+        ws      (create-uninitialized-workspace! creator-id db-id ws-name 5)]
+    (if provisional?
+      ws
+      (initialize-workspace! ws db-id))))
+
+(defn add-to-changeset!
+  "Add the given transform to the workspace changeset.
+   If workspace is uninitialized, initializes it with the transform's target database."
+  [creator-id workspace entity-type global-id body]
+  (ws.u/assert-transform! entity-type)
+  ;; Initialize workspace if uninitialized (outside transaction so async task can see committed data)
+  (let [workspace (if (= :uninitialized (:status workspace))
+                    (let [target-db-id (get-in body [:target :database])]
+                      (api/check-400 target-db-id "Transform must have a target database")
+                      (initialize-workspace! workspace target-db-id))
+                    workspace)]
+    (t2/with-transaction [_]
+      (let [workspace-id    (:id workspace)
+            workspace-db-id (:database_id workspace)
+            body            (assoc-in body [:target :database] workspace-db-id)
+            transform       (t2/insert-returning-instance!
+                             :model/WorkspaceTransform
+                             (assoc (select-keys body [:name :description :source :target])
+                                    :ref_id (ws.u/generate-ref-id)
+                                    :creator_id creator-id
+                                    :global_id global-id
+                                    :workspace_id workspace-id))]
+        (ws.impl/sync-transform-dependencies! workspace (select-keys transform [:ref_id :source_type :source :target]))
+        transform))))

enterprise/backend/src/metabase_enterprise/workspaces/core.clj

@@ -0,0 +1,2 @@
+;; For now, we do not anticipate any non-API usage of this module.
+(ns metabase-enterprise.workspaces.core)

enterprise/backend/src/metabase_enterprise/workspaces/dag.clj

@@ -0,0 +1,212 @@
+;; TODO consider renaming this to dataflow
+(ns metabase-enterprise.workspaces.dag
+  "Used to do graph computations with respect to dataflow within a workspace.
+
+   This namespace should encapsulate all coupling to the [[metabase-enterprise.dependencies]] module, including through
+   database artifacts.
+
+   It is purely concerned with calculation, any side effects wanted as a result of the analysis should happen outside."
+  (:require
+   [metabase-enterprise.workspaces.util :as ws.u]
+   [metabase.util :as u]
+   [toucan2.core :as t2]
+   [toucan2.realize :as t2.realize]))
+
+;; Is this working with appdb-ids or ref-ids?
+(defn unsupported-dependency?
+  "Return a map of the entities which have unsupported dependencies, or nil if there are none."
+  [{transform-ids :transforms :as _entity-map}]
+  ;; TODO filter out those that don't have a card dependency
+  (when (seq transform-ids)
+    {:transforms transform-ids}))
+
+;; TODO (chris 2025/12/15) Should we leverage data-authority table metadata to speed things up?
+
+(defn- table-id->coord [id]
+  (t2/select-one [:model/Table :id :schema [:name :table] [:db_id :db]] id))
+
+(defn- global-parents
+  "Dependencies analyzed by global hooks - may be incomplete. For example, excluding transforms that have not been run."
+  [ws-id node-type id]
+  ;; Note: from_entity_type is transformed to a keyword by the Dependency model
+  (t2/select-fn-vec (fn [{id :to_entity_id entity-type :to_entity_type}]
+                      (case entity-type
+                        :card {:node-type :external-card, :id id}
+                        :table {:node-type :table, :id (table-id->coord id)}
+                        :transform {:node-type :external-transform, :id id}))
+                    [:model/Dependency :to_entity_type :to_entity_id]
+                    :from_entity_type node-type
+                    :from_entity_id id
+                    ;; Exclude transforms which are being overridden in the workspace.
+                    ;; Note: use string "transform" in SQL WHERE clause (db stores strings)
+                    {:where [:not [:and
+                                   [:= "transform" :to_entity_type]
+                                   [:exists {:select [1]
+                                             :from   [[:workspace_transform :wt]]
+                                             :where  [:and
+                                                      [:= :wt.workspace_id ws-id]
+                                                      [:= :wt.global_id :to_entity_id]]}]]]}))
+
+(defn- ws-transform-parents [ws-id ref-id]
+  ;; We assume there are no card dependencies yet
+  (t2/select-fn-vec (fn [table-coord]
+                      {:node-type :table, :id (t2.realize/realize table-coord)})
+                    [:model/WorkspaceInput [:db_id :db] :schema :table [:table_id :id]]
+                    :workspace_id ws-id
+                    :id [:in {:select [:to_entity_id]
+                              :from   [:workspace_dependency]
+                              :where  [:and
+                                       [:= "transform" :from_entity_type]
+                                       [:= ref-id :from_entity_id]
+                                       [:= "input" :to_entity_type]]}]))
+
+(defn- table-producers [ws-id id-or-coord]
+  ;; Work with either logical co-ords or an id
+  (let [{:keys [db schema table id]} (if (map? id-or-coord) id-or-coord (table-id->coord id-or-coord))
+        tx-ref-id (t2/select-one-fn :ref_id [:model/WorkspaceOutput :ref_id]
+                                    {:where [:and
+                                             [:= :workspace_id ws-id]
+                                             [:or
+                                              (when id
+                                                [:= :global_table_id id])
+                                              [:and
+                                               [:= :db_id db]
+                                               [:= :global_schema schema]
+                                               [:= :global_table table]]]]})]
+    (if tx-ref-id
+      ;; If there is a workspace transform that targets this table, ignore any global transform that also targets it.
+      [{:node-type :workspace-transform :id tx-ref-id}]
+      (global-parents ws-id "table" id))))
+
+(defn- table? [{:keys [node-type]}] (= :table node-type))
+
+(defn- node-parents [ws-id {:keys [node-type id]}]
+  (case node-type
+    :workspace-transform (ws-transform-parents ws-id id)
+    :external-transform  (global-parents ws-id "transform" id)
+    :external-card       (global-parents ws-id "card" id)
+    :table               (table-producers ws-id id)))
+
+(defn- node->allowed-parents
+  [pred deps node]
+  (if-not (pred node)
+    [node]
+    ;; Collapse to the things that *produce* node. If it is a root node, leave it in.
+    (or (seq (mapcat (partial node->allowed-parents pred deps) (deps node)))
+        [node])))
+
+(defn- collapse
+  "Remove nodes that satisfy pred, in-lining their transitive dependencies instead."
+  [pred deps]
+  (u/for-map [[child parents] deps
+              :when (not (pred child))]
+    [child (mapcat (partial node->allowed-parents pred deps) parents)]))
+
+(defn- render-graph [entities parents deps & {:keys [table? table-sort unwrap-table]
+                                              :or   {table?         table?
+                                                     table-sort     (juxt :db :schema :table)
+                                                     unwrap-table   :id}}]
+  (let [table-nodes (filter table? entities)
+        ;; Any table that has a parent in the subgraph is an output
+        outputs     (filter deps table-nodes)
+        ;; Anything other parent table is an input
+        inputs      (->> entities (mapcat parents) (filter table?) (remove (set outputs)) distinct)
+        entities    (->> (ws.u/toposort-dfs deps) (remove table?))
+        deps+input  (reduce
+                     (fn [deps [c parents]]
+                       (if-not (deps c)
+                         deps
+                         (update deps c into parents)))
+                     deps
+                     parents)]
+    {:inputs       (sort-by table-sort (map unwrap-table inputs))
+     :outputs      (sort-by table-sort (map unwrap-table outputs))
+     :entities     entities
+     ;; collapse tables out, directly connecting transforms? smaller graphs are easier for humans to read
+     :dependencies (collapse table? deps+input)}))
+
+(defn- path-induced-subgraph*
+  "Implementation for [[path-induced-subgraph]] that takes the lookup functions as arguments. Useful for testing."
+  [init-nodes fns]
+  (loop [members (set init-nodes)
+         cache   {}
+         ;; Association list sets from nodes to their direct dependencies
+         deps    (u/for-map [node init-nodes] [node #{}])
+         ;; Paths are vectors sorted from child to parent
+         [path & paths] (for [node members] [node])]
+    (if-not path
+      ;; Finished walking all paths, render the result.
+      (render-graph members cache deps fns)
+      ;; Look-up from cache first
+      (let [_        (when (some #(not= 1 (val %)) (frequencies path))
+                       (throw (ex-info "Cycle detected" {:path path})))
+            head     (peek path)
+            node-parents* (:node-parents fns)
+            parents  (cache head (node-parents* head))
+            cache    (assoc cache head parents)
+            continue (when parents (remove members parents))]
+        (if (not= parents continue)
+          ;; At least one parent is in the enclosed subgraph, so this entire path is as well.
+          (let [add-dep    (fn [deps [child parent]]
+                             (update deps child (fnil conj #{}) parent))
+                ;; Break up the path into adjacent child-parent pairs.
+                pairs      (concat (partition 2 1 path)
+                                   (map (fn [end] [(peek path) end]) (filter members parents)))
+                ;; Since everything along this path will now be added to deps already, we can truncate the paths.
+                next-paths (into paths (for [c continue] [(peek path) c]))]
+            (recur (into members path) cache (reduce add-dep deps pairs) next-paths))
+          ;; We have not reached another member of the enclosed subgraph yet, so keep extending.
+          (recur members cache deps (into paths (for [c continue] (conj path c)))))))))
+
+;;;; Public API
+
+(defn path-induced-subgraph
+  "Given a map of entity types to IDs, compute the path-induced subgraph.
+   `entities-by-type` is a map like {:transform [1 2 3]}.
+
+   Returns a map with:
+   - :inputs       - tables that the subgraph directly depends on, that are not themselves produced by the subgraph.
+                     ordered lexically by db+schema+table, to be stable across metabase instances, and visibly sorted.
+   - :outputs      - outputs of both the changeset transforms, and the external transforms enclosed by the changeset.
+                     both the external names, and the internal (isolated) names. sorted by the external names.
+                     point back to their relevant transform.
+
+   - :entities     - the full list of entities, both in the changeset, and those that are enclosed. topo-sorted.
+   - :dependencies - association list for the subgraph, with keys and values both in topological order"
+  [ws-id changeset]
+  (ws.u/assert-transforms! changeset)
+  (if (empty? changeset)
+    {:inputs       []
+     :outputs      []
+     :entities     []
+     :dependencies {}}
+    (let [tx-nodes   (for [{:keys [entity-type id]} changeset]
+                       (case entity-type
+                         :transform {:node-type :workspace-transform, :id id}))
+          outputs    (when (seq tx-nodes)
+                       (t2/select-fn-vec (fn [row]
+                                           {:node-type :table, :id (t2.realize/realize row)})
+                                         [:model/WorkspaceOutput
+                                          [:db_id :db]
+                                          [:global_schema :schema]
+                                          [:global_table :table]
+                                          [:global_table_id :id]]
+                                         :ref_id [:in (map :id tx-nodes)]))
+          init-nodes (concat tx-nodes outputs)
+          fns        {:node-parents (partial node-parents ws-id)
+                      :table?       table?}]
+      (path-induced-subgraph* init-nodes fns))))
+
+;; source-table ---------> checked-out-transform
+;;          \____external-transform__/
+;;
+;; should external-transform be enclosed? answer: no, because it won't become stale from changes in the workspace
+;;
+;; source-table ----> model ---> checked-out-transform
+;;
+;; this time we *need* the model to be serialized, because we need to read it in a fresh instance.
+;; it doesn't need to be remapped or "run" independently though, so does it make sense to call it enclosed?
+;;
+;; enclosed: between changeset only? or including the model in the example above?
+;; ancestors: as far back as you can go
+;;

enterprise/backend/src/metabase_enterprise/workspaces/dependencies.clj

@@ -0,0 +1,400 @@
+(ns metabase-enterprise.workspaces.dependencies
+  "Workspace-local dependency tracking.
+
+   Unlike the global `dependency` table which links to `table_id` (requiring the table to exist),
+   workspace dependencies use three tables that support logical references:
+
+   - `workspace_input`  - external tables transforms consume (may not exist yet)
+   - `workspace_output` - tables transforms produce
+   - `workspace_dependency` - edges: transform → input (external) or transform → output (internal)
+
+   ## Example: Internal Dependency (Transform B depends on Transform A's output)
+
+   Transform A produces `analytics.orders_summary`:
+   ```
+   {:ref_id \"happy-dolphin-a1b2\"
+    :target {:database 1 :schema \"analytics\" :name \"orders_summary\"}}
+   ```
+
+   Transform B reads from `analytics.orders_summary`:
+   ```
+   {:ref_id \"brave-lion-g7h8\"
+    :source {:type \"query\" :query \"SELECT * FROM analytics.orders_summary\"}
+    :target {:database 1 :schema \"analytics\" :name \"orders_report\"}}
+   ```
+
+   After processing both transforms:
+
+   workspace_output:
+   | id  | ref_id             | schema    | table          |
+   |-----|--------------------|-----------|----------------|
+   | 101 | happy-dolphin-a1b2 | analytics | orders_summary |
+   | 104 | brave-lion-g7h8    | analytics | orders_report  |
+
+   workspace_dependency:
+   | from_entity_type | from_entity_id     | to_entity_type | to_entity_id | meaning                 |
+   |------------------|--------------------| ---------------|--------------|-------------------------|
+   | transform        | brave-lion-g7h8    | output         | 101          | B depends on A's output |
+
+   Transform B's dependency points to `output:101` (Transform A's output), NOT to a new `input`.
+   This is because `analytics.orders_summary` matches an existing `workspace_output` record.
+
+   If Transform A also depended on an external table ORDERS, we'd also have:
+
+   workspace_input:
+   | id  | schema | table  | table_id |
+   |-----|--------|--------|----------|
+   | 201 | PUBLIC | ORDERS | 42       |
+
+   workspace_dependency:
+   | from_entity_type | from_entity_id     | to_entity_type | to_entity_id | meaning                      |
+   |------------------|--------------------| ---------------|--------------|------------------------------|
+   | transform        | happy-dolphin-a1b2 | input          | 201          | A depends on external ORDERS |
+   | transform        | brave-lion-g7h8    | output         | 101          | B depends on A's output      |"
+  (:require
+   [clojure.set :as set]
+   [metabase-enterprise.workspaces.models.workspace-dependency]
+   [metabase-enterprise.workspaces.models.workspace-input]
+   [metabase-enterprise.workspaces.models.workspace-output]
+   [metabase-enterprise.workspaces.util :as ws.u]
+   [metabase.app-db.core :as app-db]
+   [metabase.driver :as driver]
+   [metabase.driver.sql :as driver.sql]
+   [metabase.lib.core :as lib]
+   [metabase.lib.metadata :as lib.metadata]
+   [metabase.util :as u]
+   [metabase.util.log :as log]
+   [metabase.util.malli :as mu]
+   [metabase.util.malli.registry :as mr]
+   [metabase.util.performance :as perf]
+   [toucan2.core :as t2]))
+
+;;; ---------------------------------------- Schemas ----------------------------------------
+
+(mr/def ::table-ref
+  "A logical reference to a table by schema and name. Includes table_id if the table exists."
+  [:map
+   [:db_id :int]
+   [:schema [:maybe :string]]
+   [:table :string]
+   [:table_id {:optional true} [:maybe :int]]])
+
+(mr/def ::output-ref
+  "A reference to an output table (transform target)."
+  [:map
+   [:db_id :int]
+   [:schema [:maybe :string]]
+   [:table :string]])
+
+(mr/def ::analysis
+  "The result of analyzing an entity's dependencies."
+  [:map
+   [:output ::output-ref]
+   [:inputs [:sequential ::table-ref]]])
+
+;;; ---------------------------------------- Batch table lookups ----------------------------------------
+
+(defn- batch-table-refs-from-ids
+  "Look up table metadata for multiple table IDs in a single query.
+   Returns a map of table-id -> {:db_id :schema :table :table_id}."
+  [table-ids]
+  (when (seq table-ids)
+    (t2/select-fn->fn :id
+                      (fn [{:keys [id db_id schema name]}]
+                        {:db_id    db_id
+                         :schema   schema
+                         :table    name
+                         :table_id id})
+                      [:model/Table :id :db_id :schema :name]
+                      :id [:in table-ids])))
+
+(defn- batch-lookup-table-ids
+  "Look up table_ids for multiple logical table references in a single query.
+   Uses the same matching logic as find-table-or-transform: if parsed schema is nil,
+   it matches against the driver's default schema.
+   Returns a map of [db_id search-schema table] -> table_id where search-schema
+   is the schema used for lookup (defaulted if nil)."
+  [driver db-id table-refs]
+  (when (seq table-refs)
+    (let [default-schema  (driver.sql/default-schema driver)
+          ;; Include default-schema in filter so nil refs can match that too
+          nil-schema? (some (comp nil? :schema) table-refs)
+          schemas-to-query (into #{} (map #(or (:schema %) default-schema)) table-refs)
+          db-table-lookup (t2/select-fn->fn (juxt :schema :name) :id
+                                            [:model/Table :id :schema :name]
+                                            :db_id db-id
+                                            :name [:in (map :table table-refs)]
+                                            {:where (if nil-schema?
+                                                      [:or [:= :schema nil] [:in :schema schemas-to-query]]
+                                                      [:in :schema schemas-to-query])})]
+      (into {}
+            (keep (fn [{:keys [schema table]}]
+                    (let [table-id (or (get db-table-lookup [schema table])
+                                       (when (nil? schema)
+                                         (get db-table-lookup [default-schema table])))]
+                      (when table-id
+                        [[db-id schema table] table-id]))))
+            table-refs))))
+
+(defn- output-from-target
+  "Extract output table info from a transform's :target field."
+  [{:keys [database schema name] :as _target}]
+  {:db_id  database
+   :schema schema
+   :table  name})
+
+;;; ---------------------------------------- Input extraction ----------------------------------------
+
+(defn- inputs-from-mbql-query
+  "Extract table refs from an MBQL query. Tables are looked up by ID in batch."
+  [query]
+  (let [table-ids   (-> #{}
+                        (into (lib/all-source-table-ids query))
+                        (into (lib/all-implicitly-joined-table-ids query)))
+        table-refs  (batch-table-refs-from-ids table-ids)]
+    (u/keepv table-refs table-ids)))
+
+(defn- inputs-from-native-query
+  "Extract table refs from a native query. Uses driver/native-query-table-refs to get
+   schema+table directly, then batch looks up table_ids for tables that exist.
+   Uses the same default schema logic as find-table-or-transform."
+  [query db-id]
+  (let [driver         (:engine (lib.metadata/database query))
+        parsed-refs    (driver/native-query-table-refs driver query)
+        ;; Batch lookup existing table IDs (handles default schema logic)
+        table-id-map   (batch-lookup-table-ids driver db-id parsed-refs)]
+    (perf/for [{:keys [schema table]} parsed-refs
+               :let [table-id (get table-id-map [db-id schema table])]]
+      (cond-> {:db_id  db-id
+               :schema schema
+               :table  table}
+        table-id (assoc :table_id table-id)))))
+
+(defn- inputs-from-query
+  "Extract table refs from a query (MBQL or native)."
+  [query db-id]
+  (if (lib/native-only-query? query)
+    (inputs-from-native-query query db-id)
+    (inputs-from-mbql-query query)))
+
+(defn- inputs-from-python-transform
+  "Extract table refs from a python transform's source-tables.
+   Python transforms require tables to exist (they map name -> table_id). Batch lookup."
+  [source-tables]
+  (let [table-ids  (set (vals source-tables))
+        table-refs (batch-table-refs-from-ids table-ids)]
+    (u/keepv table-refs (vals source-tables))))
+
+(mu/defn analyze-entity :- ::analysis
+  "Analyze a workspace entity to find its dependencies.
+
+   Arguments:
+   - entity-type: keyword, must be :transform (asserted)
+   - entity: the workspace transform map with :source and :target
+
+   Returns:
+   {:output {:db_id int :schema string :table string}
+    :inputs [{:db_id int :schema string :table string} ...]}"
+  [entity-type :- :keyword
+   entity      :- :map]
+  (ws.u/assert-transform! entity-type)
+  (let [{{:keys [query source-tables], source-type :type} :source
+         target :target} entity
+        db-id (:database target)
+        inputs (cond
+                 (= (keyword source-type) :query)
+                 (inputs-from-query query db-id)
+
+                 (= (keyword source-type) :python)
+                 (inputs-from-python-transform source-tables)
+
+                 :else
+                 (do (log/warnf "Don't know how to analyze deps of transform with source type '%s'" source-type)
+                     []))]
+    {:output (output-from-target target)
+     :inputs inputs}))
+
+;;; ---------------------------------------- Write helpers ----------------------------------------
+
+(defn- upsert-workspace-output!
+  "Upsert a workspace_output record for the transform's target table.
+   Stores both global (original) and isolated (workspace-specific) table identifiers.
+   Returns the workspace_output id."
+  [workspace-id ref-id isolated-schema {:keys [db_id schema table]} normalize-sql]
+  (app-db/update-or-insert! :model/WorkspaceOutput
+                            {:workspace_id workspace-id
+                             :ref_id       ref-id}
+                            (fn [existing]
+                              (let [isolated-table (ws.u/isolated-table-name schema table)
+                                    qry-table-id   (fn [schema table]
+                                                     (t2/select-one-fn :id [:model/Table :id]
+                                                                       :db_id db_id
+                                                                       :schema (normalize-sql schema)
+                                                                       :name (normalize-sql table)))
+                                    id-if-match    (fn [schema-key schema table-key table id-key]
+                                                     (when (and (= schema (get existing schema-key))
+                                                                (= table (get existing table-key)))
+                                                       (get existing id-key)))
+                                    id-or-fallback (fn [schema-key schema table-key table id-key]
+                                                     (or (id-if-match schema-key schema table-key table id-key)
+                                                         (qry-table-id schema table)))]
+                                {:db_id             db_id
+                                 :global_schema     schema
+                                 :global_table      table
+                                 :global_table_id   (id-or-fallback
+                                                     :global_schema schema
+                                                     :global_table table
+                                                     :global_table_id)
+                                 :isolated_schema   isolated-schema
+                                 :isolated_table    isolated-table
+                                 :isolated_table_id (id-or-fallback
+                                                     :isolated_schema isolated-schema
+                                                     :isolated_table isolated-table
+                                                     :isolated_table_id)}))))
+
+(defn- build-output-lookup
+  "Build a lookup map for workspace outputs: [db_id global_schema global_table] -> output_id.
+   Single query to fetch all outputs for the workspace."
+  [workspace-id]
+  (t2/select-fn->fn (juxt :db_id :global_schema :global_table) :id
+                    :model/WorkspaceOutput
+                    :workspace_id workspace-id))
+
+(defn- build-input-lookup
+  "Build a lookup map for workspace inputs: [db_id schema table] -> {:id :table_id}.
+   Single query to fetch all inputs for the workspace."
+  [workspace-id]
+  (t2/select-fn->fn (juxt :db_id :schema :table)
+                    #(select-keys % [:id :table_id])
+                    [:model/WorkspaceInput :id :db_id :schema :table :table_id]
+                    :workspace_id workspace-id))
+
+(defn- normalize-input-schema
+  "Normalize an input's schema: replace nil with the driver's default schema.
+   This ensures consistent comparison with output schemas which are always explicit."
+  [default-schema input]
+  (update input :schema #(or % default-schema)))
+
+(defn- ensure-workspace-inputs!
+  "Ensure all external inputs exist in workspace_input table.
+   Uses batch lookup to avoid N+1. Returns map of [db_id schema table] -> input_id.
+   Inputs should already have normalized schemas (nil replaced with driver default)."
+  [workspace-id inputs existing-input-lookup]
+  (let [{existing true new-inputs false}
+        (group-by (fn [{:keys [db_id schema table]}]
+                    (contains? existing-input-lookup [db_id schema table]))
+                  inputs)
+
+        ;; TODO: This N+1 section could be optimized into one batch update using HoneySQL
+        _ (doseq [{:keys [db_id schema table table_id]} existing]
+            (let [existing-record (get existing-input-lookup [db_id schema table])]
+              (when (and existing-record
+                         (not= (:table_id existing-record) table_id))
+                (t2/update! :model/WorkspaceInput (:id existing-record) {:table_id table_id}))))
+
+        new-input-records (when (seq new-inputs)
+                            (t2/insert-returning-instances!
+                             :model/WorkspaceInput
+                             (for [{:keys [db_id schema table table_id]} new-inputs]
+                               {:workspace_id workspace-id
+                                :db_id        db_id
+                                :schema       schema
+                                :table        table
+                                :table_id     table_id})))
+
+        new-input-lookup (into {} (map (fn [{:keys [id db_id schema table]}]
+                                         [[db_id schema table] id])
+                                       new-input-records))]
+    (merge (into {} (map (fn [[k v]] [k (:id v)]) existing-input-lookup))
+           new-input-lookup)))
+
+(defn- create-dependency-edges!
+  "Batch create workspace_dependency edges."
+  [workspace-id ref-id dep-specs]
+  (when (seq dep-specs)
+    (t2/insert! :model/WorkspaceDependency
+                (for [{:keys [to_entity_type to_entity_id]} dep-specs]
+                  {:workspace_id     workspace-id
+                   :from_entity_type :transform
+                   :from_entity_id   ref-id
+                   :to_entity_type   to_entity_type
+                   :to_entity_id     to_entity_id}))))
+
+(defn- delete-stale-edges!
+  "Delete dependency edges that are no longer present.
+   Uses single delete with OR conditions for batch deletion."
+  [workspace-id ref-id stale-edges]
+  (when (seq stale-edges)
+    (doseq [{:keys [to_entity_type to_entity_id]} stale-edges]
+      ;; TODO: Could optimize further with raw SQL DELETE ... WHERE (type, id) IN (...)
+      (t2/delete! :model/WorkspaceDependency
+                  :workspace_id workspace-id
+                  :from_entity_type :transform
+                  :from_entity_id ref-id
+                  :to_entity_type to_entity_type
+                  :to_entity_id to_entity_id))))
+
+(defn- current-edge-specs
+  "Get the current dependency edge specs for a transform."
+  [workspace-id ref-id]
+  (into #{}
+        (map #(select-keys % [:to_entity_type :to_entity_id]))
+        (t2/select [:model/WorkspaceDependency :to_entity_type :to_entity_id]
+                   :workspace_id workspace-id
+                   :from_entity_type :transform
+                   :from_entity_id ref-id)))
+
+(mu/defn write-dependencies! :- :nil
+  "Persist dependency analysis for a workspace entity.
+
+   Arguments:
+   - workspace-id: int
+   - isolated-schema: string, the workspace's isolated schema name
+   - entity-type: keyword, must be :transform
+   - ref-id: string, the workspace_transform.ref_id
+   - analysis: result from analyze-entity
+
+   Side effects:
+   - Upserts workspace_output for this transform (with both global and isolated identifiers)
+   - Upserts workspace_input for each external table dependency
+   - Creates workspace_dependency edges
+   - Deletes stale edges"
+  [workspace-id    :- :int
+   isolated-schema :- :string
+   entity-type     :- :keyword
+   ref-id          :- :string
+   {:keys [output inputs]} :- ::analysis]
+  (ws.u/assert-transform! entity-type)
+  (t2/with-transaction [_conn]
+    (let [output-lookup         (build-output-lookup workspace-id)
+          existing-input-lookup (build-input-lookup workspace-id)
+          current-edges         (current-edge-specs workspace-id ref-id)
+          driver                (t2/select-one-fn :engine [:model/Database :engine]
+                                                  :id [:in {:select [:database_id]
+                                                            :from   [:workspace]
+                                                            :where  [:= :id workspace-id]}])
+          ;; TODO (chris 2025/12/17) I solemnly declare that we will clean up this coupling nightmare for table normalization
+          ;; -> lbrdnk: requring resolve instead of normal :require here to avoid reformat attempt of the cljfmt
+          ;;            performed in CI, which if successful moves the ignore where it should not be, hence the linter
+          ;;            is failing, or the reformat alone fails the CI.
+          normalize             (partial @(requiring-resolve 'metabase.driver.sql.normalize/normalize-name) driver)]
+      (upsert-workspace-output! workspace-id ref-id isolated-schema output normalize)
+      (let [{internal-inputs true external-inputs false} (group-by (fn [{:keys [db_id schema table]}]
+                                                                     (contains? output-lookup [db_id schema table]))
+                                                                   inputs)
+            default-schema (driver.sql/default-schema driver)
+            ;; Normalize external inputs so lookups use consistent schema keys
+            normalized-external-inputs (map (partial normalize-input-schema default-schema) external-inputs)
+            input-id-lookup (ensure-workspace-inputs! workspace-id normalized-external-inputs existing-input-lookup)
+            new-dep-specs (concat
+                           (for [{:keys [db_id schema table]} internal-inputs]
+                             {:to_entity_type :output
+                              :to_entity_id   (get output-lookup [db_id schema table])})
+                           (for [{:keys [db_id schema table]} normalized-external-inputs]
+                             {:to_entity_type :input
+                              :to_entity_id   (get input-id-lookup [db_id schema table])}))
+            new-dep-specs-set (set new-dep-specs)
+            edges-to-create (set/difference new-dep-specs-set current-edges)
+            edges-to-delete (set/difference current-edges new-dep-specs-set)]
+        (create-dependency-edges! workspace-id ref-id edges-to-create)
+        (delete-stale-edges! workspace-id ref-id edges-to-delete)))))

enterprise/backend/src/metabase_enterprise/workspaces/execute.clj

@@ -0,0 +1,120 @@
+(ns metabase-enterprise.workspaces.execute
+  "This namespace is concerned with executing non-AppDB transforms, with optional reference re-mappings.
+
+  It currently lives inside the workspace module, but eventually will become part of the transform module, so it should
+  not make any assumptions about being run within a workspace, having the input / output semantics of a workspace, and
+  especially it should not touch any of the Workspace entities inside AppDb, or any of the other workspace namespaces.
+
+  For now, it uses AppDB as a side-channel with the transforms module, but in future this module should be COMPLETELY
+  decoupled from AppDb."
+  (:require
+   [macaw.core :as macaw]
+   [metabase-enterprise.transforms.core :as transforms]
+   [metabase-enterprise.transforms.execute :as transforms.execute]
+   [metabase.api.common :as api]
+   [metabase.util :as u]
+   [toucan2.core :as t2]))
+
+(set! *warn-on-reflection* true)
+
+(defn- execution-results
+  "Extract execution metadata from transform_run and target table info.
+   Must be called within the transaction before rollback."
+  [{xf-id :id :keys [target]}]
+  (let [run (t2/select-one :model/TransformRun :transform_id xf-id)]
+    (merge
+     (select-keys run [:status :start_time :end_time :message])
+     {:table {:name   (:name target)
+              :schema (:schema target)}})))
+
+(defn- remap-python-source
+  "Remap source-tables in a Python transform source to point to isolated tables.
+   Handles both legacy integer format and new map format (from PR #66934)."
+  [table-mapping source]
+  (letfn [(remap [{:keys [database_id schema table table_id] :as table-ref}]
+            (if-let [{:keys [id db-id schema table]} (or (table-mapping table-ref)
+                                                         (some-> table_id table-mapping)
+                                                         (when table
+                                                           (table-mapping [database_id schema table])))]
+              ;; Prefer table ID when available; map format won't work until PR #66934 is merged:
+              ;; https://github.com/metabase/metabase/pull/66934
+              (or id {:database_id db-id, :schema schema, :table table})
+              ;; Leave it un-mapped if we don't have an override.
+              table-ref))]
+    (update source :source-tables update-vals remap)))
+
+(defn- remap-sql-source [table-mapping source]
+  (let [remapping (reduce
+                   (fn [remapping [[_ source-schema source-table] {target-schema :schema, target-table :table}]]
+                     (-> remapping
+                         (assoc-in [:schemas source-schema] target-schema)
+                         (assoc-in [:tables {:schema source-schema
+                                             :table  source-table}] target-table)))
+                   {:schemas {}
+                    :tables  {}}
+                   ;; Strip out the numeric keys (table ids)
+                   (filter (comp vector? key) table-mapping))]
+    ;; We may need to set other options, like the case insensitivity (driver dependent)
+    (update-in source [:query :stages 0 :native] #(macaw/replace-names % remapping {:allow-unused? true}))))
+
+(defn- remap-mbql-source [_table-mapping _field-map source]
+  (throw (ex-info "Remapping MBQL queries is not supported yet" {:source source})))
+
+(defn- remap-source [table-map field-map source-type source]
+  (case source-type
+    :mbql (remap-mbql-source table-map field-map source)
+    ;; TODO make sure it's actually a SQL dialect though..
+    :native (remap-sql-source table-map source)
+    :python (remap-python-source table-map source)))
+
+;; You might prefer a multi-method? I certainly would.
+
+(defn- remap-target [table-map target-fallback {d :database, s :schema, t :name :as target}]
+  (if-let [replacement (or (table-map [d s t]) (target-fallback [d s t]))]
+    ;; Always fallback to tables for re-mapped outputs, regardless of the type used in the original target.
+    {:type     (:type replacement "table")
+     :database (:db-id replacement)
+     :schema   (:schema replacement)
+     :name     (:table replacement)}
+    target))
+
+(def ^:private no-mapping {})
+
+(defn run-transform-with-remapping
+  "Execute a given collection with the given table and field re-mappings.
+
+   This is used by Workspaces to re-route the output of each transform to a non-production table, and
+   to re-write their queries where these outputs transitively become inputs to other transforms.
+
+   Returns an ::ws.t/execution-result map with status, timing, and table metadata.
+
+   -------
+
+   NOTE: currently execution is done using transaction-rollback pattern, as a short-term hack.
+
+   1. Creating temporary Transform/TransformRun records in a transaction
+   2. Executing using existing transform infrastructure
+   3. Scraping metadata (execution stats + table schema)
+   4. Rolling back the transaction (no app DB records persist)
+
+   The warehouse DB changes (actual table data) DO persist in the isolated schema."
+  [{:keys [source target] :as transform} remapping]
+  (t2/with-transaction [_conn]
+    (let [s-type          (transforms/transform-source-type source)
+          table-mapping   (:tables remapping no-mapping)
+          target-fallback (:target-fallback remapping no-mapping)
+          field-mapping   (:fields remapping no-mapping)
+          new-xf          (-> (select-keys transform [:name :description])
+                              (assoc :creator_id api/*current-user-id*
+                                     :source (remap-source table-mapping field-mapping s-type source)
+                                     :target (remap-target table-mapping target-fallback target)))
+          _               (assert (:target new-xf) "Target mapping must not be nil")
+          temp-xf         (t2/insert-returning-instance! :model/Transform new-xf)]
+      (try
+        (transforms.execute/execute! temp-xf {:run-method :manual})
+        (catch Exception _e
+          ;; Execution failed - the TransformRun record has been updated with failure status and message
+          nil))
+      ;; Return execution results whether succeeded or failed
+      (u/prog1 (execution-results temp-xf)
+        (t2/delete! :model/Transform (:id temp-xf))))))

enterprise/backend/src/metabase_enterprise/workspaces/impl.clj

@@ -0,0 +1,364 @@
+(ns metabase-enterprise.workspaces.impl
+  "Glue code connecting workspace subsystems (dependencies, isolation)."
+  (:require
+   [clojure.set :as set]
+   [metabase-enterprise.workspaces.dag :as ws.dag]
+   [metabase-enterprise.workspaces.dependencies :as ws.deps]
+   [metabase-enterprise.workspaces.execute :as ws.execute]
+   [metabase-enterprise.workspaces.isolation :as ws.isolation]
+   [metabase-enterprise.workspaces.util :as ws.u]
+   [metabase.driver.sql :as driver.sql]
+   [metabase.util :as u]
+   [metabase.util.log :as log]
+   [toucan2.core :as t2]))
+
+(defn- query-ungranted-external-inputs
+  "Query for external inputs in a workspace that haven't been granted access yet.
+   External inputs are tables that are not shadowed by any output.
+   Returns seq of WorkspaceInput records where access_granted is false."
+  [workspace-id]
+  ;; NOTE: Could optimize with table_id join if workspace_output gets that column,
+  ;; but not worth it given the small number of rows per workspace.
+  (t2/select :model/WorkspaceInput
+             :workspace_id workspace-id
+             {:where [:and
+                      [:= :workspace_input.access_granted false]
+                      [:not [:exists {:select [1]
+                                      :from   [[:workspace_output :wo]]
+                                      :where  [:and
+                                               [:= :wo.workspace_id :workspace_input.workspace_id]
+                                               [:= :wo.db_id :workspace_input.db_id]
+                                               [:or
+                                                [:and [:= :wo.global_schema nil] [:= :workspace_input.schema nil]]
+                                                [:= :wo.global_schema :workspace_input.schema]]
+                                               [:= :wo.global_table :workspace_input.table]]}]]]}))
+
+(defn- external-input->table
+  [{:keys [schema table]}]
+  {:schema schema
+   :name   table})
+
+(defn sync-grant-accesses!
+  "Grant read access to external input tables for a workspace that haven't been granted yet.
+   External inputs are tables that are read by transforms but not produced by any transform in the workspace.
+   This should be called after adding transforms to a workspace or when re-initializing workspace isolation
+   (e.g., after unarchiving)."
+  [{workspace-id :id :as workspace}]
+  (let [ungranted-inputs (query-ungranted-external-inputs workspace-id)]
+    (if-not (:database_details workspace)
+      ;; TODO (chris 2025/12/15) we will want to make this strict before merging to master
+      #_(throw (ex-info "No database details, unable to grant read only access to the service account." {}))
+      (log/warn "No database details, unable to grant read only access to the service account.")
+      (when (seq ungranted-inputs)
+        (let [database (t2/select-one :model/Database :id (:database_id workspace))
+              tables   (mapv external-input->table ungranted-inputs)]
+          (try
+            (ws.isolation/grant-read-access-to-tables! database workspace tables)
+            ;; Mark inputs as granted after successful grant
+            (t2/update! :model/WorkspaceInput {:id [:in (map :id ungranted-inputs)]}
+                        {:access_granted true})
+            (catch Exception e
+              (log/warn e "Error granting RO table permissions"))))))))
+
+(defn sync-transform-dependencies!
+  "Analyze and persist dependencies for a workspace transform, then grant
+   read access to external input tables."
+  [{workspace-id :id, isolated-schema :schema :as workspace} transform]
+  (let [analysis (ws.deps/analyze-entity :transform transform)]
+    (ws.deps/write-dependencies! workspace-id isolated-schema :transform (:ref_id transform) analysis)
+    (sync-grant-accesses! workspace)))
+
+(defn- build-remapping [workspace]
+  ;; Build table remapping from stored WorkspaceOutput and WorkspaceOutputExternal data.
+  ;; Maps [db_id global_schema global_table] -> {:db-id :schema :table :id} for isolated tables.
+  ;; Also maps global_table_id -> same. This is more convenient and reliable for MBQL queries and Python transforms.
+  ;; Also maps [db_id nil global_table] for tables in the default schema, so unqualified SQL references work.
+  ;; This is used to remap queries, sources and targets to reflect the "isolated" tables used to seal the Workspace.
+  (let [outputs          (t2/select [:model/WorkspaceOutput
+                                     :db_id :global_schema :global_table :global_table_id
+                                     :isolated_schema :isolated_table :isolated_table_id]
+                                    :workspace_id (:id workspace))
+        external-outputs (t2/select [:model/WorkspaceOutputExternal
+                                     :db_id :global_schema :global_table :global_table_id
+                                     :isolated_schema :isolated_table :isolated_table_id]
+                                    :workspace_id (:id workspace))
+        all-outputs      (concat outputs external-outputs)
+        ;; Get default schema for each database involved
+        db-ids           (into #{} (map :db_id) all-outputs)
+        db-id->default   (when (seq db-ids)
+                           (t2/select-fn->fn :id #(driver.sql/default-schema (:engine %))
+                                             [:model/Database :id :engine]
+                                             :id [:in db-ids]))
+        table-map        (reduce
+                          (fn [m {:keys [db_id global_schema global_table global_table_id
+                                         isolated_schema isolated_table isolated_table_id]}]
+                            (let [replacement    {:db-id  db_id
+                                                  :schema isolated_schema
+                                                  :table  isolated_table
+                                                  :id     isolated_table_id}
+                                  default-schema (get db-id->default db_id)]
+                              (cond-> (assoc m [db_id global_schema global_table] replacement)
+                                global_table_id (assoc global_table_id replacement)
+                                ;; Add nil-schema entry for tables in the default schema
+                                (= global_schema default-schema) (assoc [db_id nil global_table] replacement))))
+                          {}
+                          all-outputs)]
+    {:tables          table-map
+     ;; We never want to write to any global tables, so remap on-the-fly if we hit an un-mapped target.
+     :target-fallback (fn [[d s t]]
+                        (log/warn "Missing remapping for" {:db d :schema s, :table s})
+                        {:db-id d, :schema (:schema workspace), :table (ws.u/isolated-table-name s t), :id nil})
+     ;; We won't need the field-map until we support MBQL.
+     :fields          nil}))
+
+(defn- backfill-isolated-table-id!
+  "Backfill workspace_output.isolated_table_id FK in the case where we just created the table for the first time."
+  [ref-id]
+  (when-let [table-id (:id (t2/query-one
+                            {:from   [[:workspace_output :wo]]
+                             :join   [[:metabase_table :t] [:and
+                                                            [:= :t.db_id :wo.db_id]
+                                                            [:= :t.schema :wo.isolated_schema]
+                                                            [:= :t.name :wo.isolated_table]]]
+                             :select [:t.id]
+                             :where  [:and
+                                      [:= :wo.ref_id ref-id]
+                                      [:or [:= :wo.isolated_table_id nil] [:not= :t.id :wo.isolated_table_id]]]}))]
+    (t2/update! :model/WorkspaceOutput {:ref_id ref-id} {:isolated_table_id table-id})))
+
+(defn- backfill-external-isolated-table-id!
+  "Backfill workspace_output_external.isolated_table_id FK after running an enclosed external transform."
+  [transform-id]
+  (when-let [table-id (:id (t2/query-one
+                            {:from   [[:workspace_output_external :woe]]
+                             :join   [[:metabase_table :t] [:and
+                                                            [:= :t.db_id :woe.db_id]
+                                                            [:= :t.schema :woe.isolated_schema]
+                                                            [:= :t.name :woe.isolated_table]]]
+                             :select [:t.id]
+                             :where  [:and
+                                      [:= :woe.transform_id transform-id]
+                                      [:or [:= :woe.isolated_table_id nil] [:not= :t.id :woe.isolated_table_id]]]}))]
+    (t2/update! :model/WorkspaceOutputExternal {:transform_id transform-id} {:isolated_table_id table-id})))
+
+(defn run-transform!
+  "Execute the given workspace transform or enclosed external transform."
+  ([workspace transform]
+   (run-transform! workspace transform (build-remapping workspace)))
+  ([workspace transform remapping]
+   (let [ref-id (:ref_id transform)
+         external-id (:id transform)
+         result (ws.isolation/with-workspace-isolation workspace (ws.execute/run-transform-with-remapping transform remapping))]
+     (when ref-id
+       (t2/update! :model/WorkspaceTransform ref-id {:last_run_at      (:end_time result)
+                                                     :last_run_message (:message result)}))
+     (when (= :succeeded (:status result))
+       (if ref-id
+         ;; Workspace transform
+         (backfill-isolated-table-id! ref-id)
+         ;; External transform (enclosed in workspace)
+         (backfill-external-isolated-table-id! external-id)))
+     result)))
+
+;;;; ---------------------------------------- External Transform Sync ----------------------------------------
+
+(defn- extract-external-transform-ids
+  "Extract IDs of external transforms from graph entities."
+  [entities]
+  (into [] (comp (filter #(= :external-transform (:node-type %)))
+                 (map :id))
+        entities))
+
+(defn- sync-external-outputs!
+  "Sync workspace_output_external table based on enclosed external transforms in the graph.
+   Deletes obsolete rows, upserts current ones, and backfills table IDs where possible."
+  [workspace-id isolated-schema entities]
+  (let [external-tx-ids (extract-external-transform-ids entities)
+        existing-rows   (when (seq external-tx-ids)
+                          (t2/select-fn->fn :transform_id identity
+                                            :model/WorkspaceOutputExternal
+                                            :workspace_id workspace-id))
+        existing-tx-ids (set (keys existing-rows))]
+    ;; Delete rows for transforms no longer in the graph
+    (let [obsolete-ids (set/difference existing-tx-ids (set external-tx-ids))]
+      (when (seq obsolete-ids)
+        (t2/delete! :model/WorkspaceOutputExternal
+                    :workspace_id workspace-id
+                    :transform_id [:in obsolete-ids])))
+    ;; Upsert rows for current external transforms
+    (when (seq external-tx-ids)
+      (let [transforms (t2/select [:model/Transform :id :target] :id [:in external-tx-ids])]
+        (doseq [{tx-id :id, {:keys [database schema name]} :target} transforms]
+          (let [isolated-table (ws.u/isolated-table-name schema name)
+                existing       (get existing-rows tx-id)
+                ;; Try to find table IDs - reuse existing if schema/table match
+                global-table-id (or (when (and existing
+                                               (= schema (:global_schema existing))
+                                               (= name (:global_table existing)))
+                                      (:global_table_id existing))
+                                    (t2/select-one-fn :id [:model/Table :id]
+                                                      :db_id database :schema schema :name name))
+                isolated-table-id (or (when (and existing
+                                                 (= isolated-schema (:isolated_schema existing))
+                                                 (= isolated-table (:isolated_table existing)))
+                                        (:isolated_table_id existing))
+                                      (t2/select-one-fn :id [:model/Table :id]
+                                                        :db_id database :schema isolated-schema :name isolated-table))]
+            (if existing
+              (t2/update! :model/WorkspaceOutputExternal (:id existing)
+                          {:db_id             database
+                           :global_schema     schema
+                           :global_table      name
+                           :global_table_id   global-table-id
+                           :isolated_schema   isolated-schema
+                           :isolated_table    isolated-table
+                           :isolated_table_id isolated-table-id})
+              (t2/insert! :model/WorkspaceOutputExternal
+                          {:workspace_id      workspace-id
+                           :transform_id      tx-id
+                           :db_id             database
+                           :global_schema     schema
+                           :global_table      name
+                           :global_table_id   global-table-id
+                           :isolated_schema   isolated-schema
+                           :isolated_table    isolated-table
+                           :isolated_table_id isolated-table-id}))))))))
+
+(defn- normalize-table-schema
+  "Normalize a table's schema: replace nil with the driver's default schema.
+   Takes a map of db_id -> default-schema for lookup."
+  [db-id->default-schema {:keys [db_id schema] :as table}]
+  (if (some? schema)
+    table
+    (assoc table :schema (get db-id->default-schema db_id))))
+
+(defn- sync-external-inputs!
+  "Sync workspace_input_external table based on enclosed external transforms in the graph.
+   Tracks external tables consumed by enclosed transforms that aren't outputs of other transforms.
+   Inputs are deduplicated per workspace. Normalizes nil schemas to driver defaults."
+  [workspace-id entities]
+  (let [external-tx-ids (extract-external-transform-ids entities)]
+    (when (seq external-tx-ids)
+      ;; Query global Dependency table for all inputs of external transforms
+      (let [input-tables (t2/select [:model/Dependency :to_entity_id]
+                                    :from_entity_type :transform
+                                    :from_entity_id [:in external-tx-ids]
+                                    :to_entity_type :table)
+            input-table-ids (into #{} (map :to_entity_id) input-tables)
+            ;; Get workspace output table IDs (both workspace and external outputs)
+            workspace-output-ids (t2/select-fn-set :global_table_id
+                                                   [:model/WorkspaceOutput :global_table_id]
+                                                   :workspace_id workspace-id
+                                                   {:where [:not= :global_table_id nil]})
+            external-output-ids (t2/select-fn-set :global_table_id
+                                                  [:model/WorkspaceOutputExternal :global_table_id]
+                                                  :workspace_id workspace-id
+                                                  {:where [:not= :global_table_id nil]})
+            all-output-ids (set/union workspace-output-ids external-output-ids)
+            ;; Filter to only true external inputs (not outputs of transforms in graph)
+            external-input-ids (set/difference input-table-ids all-output-ids)]
+        (when (seq external-input-ids)
+          ;; Get table details for external inputs
+          (let [tables (t2/select [:model/Table :id :db_id :schema :name] :id [:in external-input-ids])
+                ;; Build default schema lookup for each database involved
+                db-ids (into #{} (map :db_id) tables)
+                db-id->default-schema (when (seq db-ids)
+                                        (into {}
+                                              (map (fn [{:keys [id engine]}]
+                                                     [id (driver.sql/default-schema engine)]))
+                                              (t2/select [:model/Database :id :engine] :id [:in db-ids])))
+                ;; Normalize schemas: nil -> default schema for the table's database
+                normalized-tables (map (partial normalize-table-schema db-id->default-schema) tables)
+                new-inputs (into {}
+                                 (map (fn [{:keys [id db_id schema name]}]
+                                        [[db_id schema name] {:table_id id}]))
+                                 normalized-tables)
+                ;; Get existing external inputs
+                existing-inputs (t2/select-fn->fn (juxt :db_id :schema :table)
+                                                  #(select-keys % [:id :table_id])
+                                                  [:model/WorkspaceInputExternal :id :db_id :schema :table :table_id]
+                                                  :workspace_id workspace-id)
+                existing-keys (set (keys existing-inputs))
+                new-keys (set (keys new-inputs))
+                obsolete-keys (set/difference existing-keys new-keys)
+                missing-keys (set/difference new-keys existing-keys)]
+            ;; Delete obsolete rows
+            (doseq [[db_id schema table] obsolete-keys]
+              (t2/delete! :model/WorkspaceInputExternal
+                          :workspace_id workspace-id
+                          :db_id db_id
+                          :schema schema
+                          :table table))
+            ;; Insert missing rows
+            (when (seq missing-keys)
+              (t2/insert! :model/WorkspaceInputExternal
+                          (for [[db_id schema table] missing-keys]
+                            {:workspace_id   workspace-id
+                             :db_id          db_id
+                             :schema         schema
+                             :table          table
+                             :table_id       (:table_id (get new-inputs [db_id schema table]))
+                             :access_granted false})))))))))
+
+;; TODO save graph with invalidation hooks
+(defn get-or-calculate-graph
+  "Return the graph. Also syncs workspace_output_external and workspace_input_external tables."
+  [{ws-id :id, isolated-schema :schema :as _workspace}]
+  (let [graph (ws.dag/path-induced-subgraph ws-id (t2/select-fn-vec (fn [{:keys [ref_id]}] {:entity-type :transform :id ref_id})
+                                                                    [:model/WorkspaceTransform :ref_id]
+                                                                    :workspace_id ws-id))]
+    (sync-external-outputs! ws-id isolated-schema (:entities graph))
+    (sync-external-inputs! ws-id (:entities graph))
+    graph))
+
+(defn- transforms-to-execute
+  "Given a workspace and an optional filter, return the global and workspace definitions to run, in the correct order."
+  [{ws-id :id :as workspace} & {:keys [stale-only?]}]
+  ;; 1. Depending on what we end up storing in this field, we might not be considering stale ancestors.
+  ;; 2. For now, we never set this field to false, so we'll always run everything, even with the flag.
+  ;; Why is there all this weird code then? To avoid unused references.
+  (let [stale-clause (if stale-only? {:where [:= :stale true]} {})
+        entities     (:entities (get-or-calculate-graph workspace))
+        type->ids    (u/group-by :node-type :id entities)
+        id->tx       (merge
+                      {}
+                      (when-let [ids (seq (type->ids :external-transform))]
+                        (t2/select-fn->fn :id identity
+                                          [:model/Transform :id :name :source :target]
+                                          :id [:in ids]
+                                          stale-clause))
+                      (when-let [ref-ids (seq (type->ids :workspace-transform))]
+                        (t2/select-fn->fn :ref_id identity
+                                          [:model/WorkspaceTransform :ref_id :name :source :target]
+                                          :workspace_id ws-id
+                                          :ref_id [:in ref-ids]
+                                          stale-clause)))]
+    (keep (comp id->tx :id) entities)))
+
+(defn- id->str [ref-id-or-id]
+  (if (string? ref-id-or-id)
+    ref-id-or-id
+    (str "global-id:" ref-id-or-id)))
+
+(defn execute-workspace!
+  "Execute all the transforms within a given workspace."
+  [workspace & {:keys [stale-only?] :or {stale-only? false}}]
+  (let [ws-id     (:id workspace)
+        remapping (build-remapping workspace)]
+    (reduce
+     (fn [acc {external-id :id ref-id :ref_id :as transform}]
+       (let [node-type (if external-id :external-transform :workspace-transform)
+             id-str    (id->str (or external-id ref-id))]
+         (try
+           ;; Perhaps we want to return some of the metadata from this as well?
+           (if (= :succeeded (:status (run-transform! workspace transform remapping)))
+             (update acc :succeeded conj id-str)
+             ;; Perhaps the status might indicate it never ran?
+             (update acc :failed conj id-str))
+           (catch Exception e
+             (log/error e "Failed to execute transform" {:workspace-id ws-id :node-type node-type :id id-str})
+             (update acc :failed conj id-str)))))
+     {:succeeded []
+      :failed    []
+      :not_run   []}
+     (transforms-to-execute workspace {:stale-only stale-only?}))))

enterprise/backend/src/metabase_enterprise/workspaces/init.clj

@@ -0,0 +1,6 @@
+(ns metabase-enterprise.workspaces.init
+  "Initialize workspace models. Driver workspace isolation methods are now
+   defined directly in the driver files."
+  (:require
+   [metabase-enterprise.workspaces.models.workspace]
+   [metabase-enterprise.workspaces.models.workspace-transform]))

enterprise/backend/src/metabase_enterprise/workspaces/isolation.clj

@@ -0,0 +1,63 @@
+(ns metabase-enterprise.workspaces.isolation
+  "Workspace database isolation functions.
+
+  The actual driver-specific implementations are now in the driver files:
+  - metabase.driver.h2
+  - metabase.driver.postgres
+  - metabase.driver.redshift
+  - metabase.driver.snowflake
+  - metabase.driver.sqlserver
+  - metabase.driver.clickhouse
+  - metabase.driver.bigquery-cloud-sdk
+
+  This namespace provides the public API for workspace isolation."
+  (:require
+   [metabase.driver :as driver]
+   [metabase.driver.util :as driver.u]))
+
+;;;; Delegation to driver methods
+;; The actual multimethod implementations are now in the individual driver files.
+;; These functions dispatch through the driver multimethods.
+
+(defn init-workspace-database-isolation!
+  "Create database isolation for a workspace. Return the database details.
+   Delegates to driver/init-workspace-isolation!"
+  [database workspace]
+  (driver/init-workspace-isolation! (driver.u/database->driver database) database workspace))
+
+(defn grant-read-access-to-tables!
+  "Grant read access to these tables.
+   Delegates to driver/grant-workspace-read-access!"
+  [database workspace tables]
+  (driver/grant-workspace-read-access! (driver.u/database->driver database) database workspace tables))
+
+(defn destroy-workspace-isolation!
+  "Destroy all database resources created for workspace isolation.
+   This includes dropping tables, schemas/databases, users, roles, and logins.
+   Fails fast on first error. Should be called when deleting a workspace.
+   Delegates to driver/destroy-workspace-isolation!"
+  [database workspace]
+  (driver/destroy-workspace-isolation! (driver.u/database->driver database) database workspace))
+
+;;;; Public API
+
+(defn ensure-database-isolation!
+  "Wrapper around the driver method, to make migrations easier in future."
+  [workspace database]
+  (init-workspace-database-isolation! database workspace))
+
+(defn do-with-workspace-isolation
+  "Impl of [[with-workspace-isolation]]."
+  [workspace thunk]
+  (when-not (:database_details workspace)
+    (throw (ex-info (str "Workspace isolation was not initialized. "
+                         "If this is a test, ensure the workspace was created with isolation enabled.")
+                    {:workspace-id (:id workspace)})))
+  (driver/with-swapped-connection-details (:database_id workspace)
+    (:database_details workspace)
+    (thunk)))
+
+(defmacro with-workspace-isolation
+  "Execute body with necessary isolation."
+  [workspace & body]
+  `(do-with-workspace-isolation ~workspace (fn [] ~@body)))

enterprise/backend/src/metabase_enterprise/workspaces/merge.clj

@@ -0,0 +1,129 @@
+(ns metabase-enterprise.workspaces.merge
+  "Update global entities based on the definitions within a workspace.
+   All functions assumes that validation of the dependencies AFTER merge is done BEFORE calling any of these methods."
+  (:require
+   [metabase-enterprise.transforms.api :as transforms.api]
+   [metabase-enterprise.workspaces.models.workspace-merge]
+   [metabase-enterprise.workspaces.models.workspace-merge-transform]
+   [metabase-enterprise.workspaces.types :as ws.types]
+   [metabase.util.malli :as mu]
+   [toucan2.core :as t2])
+  (:import (java.sql Connection)))
+
+(set! *warn-on-reflection* true)
+
+(defn- create-merge-transform-history!
+  "Create a workspace_merge_transform record to track this merge operation.
+   Does nothing for :noop operations (archived transforms that don't exist globally)
+   or :delete operations (history would be CASCADE deleted with the transform anyway)."
+  [op merge-map]
+  (when (#{:create :update} op)
+    (t2/insert! :model/WorkspaceMergeTransform merge-map)))
+
+;; TODO (crisptrutski 2025/12/10): When there are more entity types support, this should update those too.
+(mu/defn merge-transform! :- [:map
+                              [:op [:enum :create :delete :noop :update]]
+                              [:ref_id ::ws.types/ref-id]
+                              [:global_id {:optional true} [:maybe ::ws.types/appdb-id]]
+                              [:error {:optional true} :any]]
+  "Make the given transform in the Changeset public, i.e. create or update the relevant model/Transform entities.
+   This should also clear it out from the Changset, as it no longer has any changes.
+
+   Creates a WorkspaceMergeTransform history record.
+   - :ws-transform - The workspace transform to merge
+   - :workspace - The workspace map (must have :id and :name keys)
+   - :workspace-merge-id - ID of parent WorkspaceMerge (caller must create this)
+   - :merging-user-id - user performing the merge
+   - :commit-message - description of the merge"
+  [{:keys [ws-transform workspace workspace-merge-id merging-user-id commit-message]}]
+  ;; Problems this may run into:
+  ;; It will recalculate and validate the dag greedily as it inserts each items, and this might fail of temporary conflicts.
+  ;; Some of these conflicts could be solved by ordering things smartly, but in the general case (e.g. reversing a
+  ;; chain) this will not be possible - we would need to defer all validation and calculation, which is a bit scary.
+  ;; Let's just focus on the happy path for now though, as this is a fundamental problem and unrelated to the design.
+  (let [{:keys [global_id ref_id archived_at]} ws-transform
+        {:keys [error] :as result}
+        (cond (and global_id archived_at)
+              (merge
+               {:op :delete :global_id global_id :ref_id ref_id}
+               (try
+                 (transforms.api/delete-transform! (t2/select-one :model/Transform :id global_id))
+                 nil
+                 (catch Throwable e
+                   {:error e})))
+
+              global_id
+              (merge
+               {:op :update :global_id global_id :ref_id ref_id}
+               (try
+                 (transforms.api/update-transform!
+                  global_id (select-keys ws-transform [:name :description :source :target]))
+                 nil
+                 (catch Throwable e
+                   {:error e})))
+
+              archived_at
+              {:op :noop :global_id nil :ref_id ref_id}
+
+              :else
+              (merge
+               {:op :create :global_id nil :ref_id ref_id}
+               (try
+                 {:global_id (:id (transforms.api/create-transform!
+                                   (select-keys ws-transform [:name :description :source :target])
+                                   (:creator_id ws-transform)))}
+                 (catch Throwable e
+                   {:error e}))))]
+
+    (when-not error
+      (t2/delete! :model/WorkspaceTransform :ref_id ref_id)
+      (create-merge-transform-history!
+       (:op result)
+       {:workspace_merge_id workspace-merge-id
+        :workspace_id       (:id workspace)
+        :workspace_name     (:name workspace)
+        :transform_id       (:global_id result)
+        :commit_message     commit-message
+        :merging_user_id    merging-user-id}))
+
+    result))
+
+;; TODO (crisptrutski 2025-12-XX): When there are more entity types support, this should update those too.
+(defn merge-workspace!
+  "Make all the transforms in the Changeset public, i.e. create or update the relevant model/Transform entities.
+   This should also clear the entire Changeset, as it no longer has any changes.
+
+   - workspace: The workspace map (must have :id and :name keys)
+   - merging-user-id: user performing the merge
+   - commit-message: description of the merge"
+  [workspace merging-user-id commit-message]
+  ;; Perhaps we want to solve the N+1?
+  ;; This will require reworking the lifecycle for validating and recalculating dependencies for the transforms.
+  (t2/with-transaction [tx]
+    (let [savepoint   (.setSavepoint ^Connection tx)
+          ws-merge-id (t2/insert-returning-pk!
+                       :model/WorkspaceMerge
+                       {:workspace_id   (:id workspace)
+                        :workspace_name (:name workspace)
+                        :commit_message commit-message
+                        :creator_id     merging-user-id})
+          result     (reduce
+                      (fn [acc ws-transform]
+                        (let [{:keys [error] :as result} (merge-transform! {:ws-transform      ws-transform
+                                                                            :workspace         workspace
+                                                                            :workspace-merge-id ws-merge-id
+                                                                            :merging-user-id   merging-user-id
+                                                                            :commit-message    commit-message})]
+                          (if error
+                            (reduced (-> acc
+                                         (update :errors conj result)
+                                         (assoc-in [:merged :transforms] [])
+                                         #_(assoc :short_circuit true)))
+                            (update-in acc [:merged :transforms] conj result))))
+                      {:merged {:transforms []}
+                       :errors []
+                       #_#_:short_circuit false}
+                      (t2/select :model/WorkspaceTransform :workspace_id (:id workspace)))]
+      (when (seq (:errors result))
+        (.rollback ^Connection tx savepoint))
+      result)))

enterprise/backend/src/metabase_enterprise/workspaces/models/workspace.clj

@@ -0,0 +1,66 @@
+(ns metabase-enterprise.workspaces.models.workspace
+  (:require
+   [metabase-enterprise.workspaces.impl :as ws.impl]
+   [metabase-enterprise.workspaces.isolation :as ws.isolation]
+   [metabase.models.interface :as mi]
+   [metabase.util.log :as log]
+   [methodical.core :as methodical]
+   [toucan2.core :as t2]))
+
+(methodical/defmethod t2/table-name :model/Workspace [_model] :workspace)
+
+(t2/deftransforms :model/Workspace
+  {:graph            mi/transform-json
+   :database_details mi/transform-encrypted-json
+   :status           mi/transform-keyword})
+
+(doto :model/Workspace
+  (derive :metabase/model)
+  (derive :hook/timestamped?))
+
+(defn archive!
+  "Archive a workspace. Destroys database isolation resources (best-effort), revokes access grants, sets archived_at.
+   Cleanup failures are logged but don't block archiving - the workspace can be unarchived to retry cleanup,
+   or deleted once the underlying permission issues are resolved."
+  [{workspace-id :id :as workspace}]
+  ;; Only destroy isolation if workspace was initialized (not uninitialized status)
+  (when (not= :uninitialized (:status workspace))
+    (let [database (t2/select-one :model/Database :id (:database_id workspace))]
+      ;; Best-effort cleanup - don't block archiving on cleanup failures
+      (try
+        (ws.isolation/destroy-workspace-isolation! database workspace)
+        (catch Exception e
+          (log/warnf e "Failed to cleanup isolation resources for workspace %s, proceeding with archive" workspace-id)))
+      ;; Mark all inputs as un-granted since the user may have been dropped
+      (t2/update! :model/WorkspaceInput {:workspace_id workspace-id}
+                  {:access_granted false})))
+  (t2/update! :model/Workspace workspace-id {:archived_at [:now]}))
+
+(defn unarchive!
+  "Unarchive a workspace. Re-initializes database isolation resources, re-grants read access
+   to source tables, and clears archived_at.
+   Cannot unarchive an uninitialized workspace (no isolation resources to restore)."
+  [workspace]
+  (when (= :uninitialized (:status workspace))
+    (throw (ex-info "Cannot unarchive an uninitialized workspace" {:status-code 400})))
+  (let [database         (t2/select-one :model/Database (:database_id workspace))
+        isolation-result (ws.isolation/ensure-database-isolation! workspace database)
+        workspace-id     (:id workspace)
+        _                (t2/update! :model/Workspace workspace-id
+                                     (merge {:archived_at nil}
+                                            (select-keys isolation-result [:schema :database_details])))
+        ;; Re-fetch workspace to get updated database_details and schema for granting permissions
+        updated-ws       (t2/select-one :model/Workspace workspace-id)]
+    ;; Re-grant read access to source tables (inputs were marked un-granted during archive)
+    (ws.impl/sync-grant-accesses! updated-ws)))
+
+(defn delete!
+  "Delete a workspace. Destroys database isolation resources and deletes the workspace."
+  [workspace]
+  ;; Only destroy isolation if workspace was initialized (not uninitialized status)
+  (when (not= :uninitialized (:status workspace))
+    (when-let [database (t2/select-one :model/Database :id (:database_id workspace))]
+      (ws.isolation/destroy-workspace-isolation! database workspace)
+      (t2/update! :model/WorkspaceInput {:workspace_id (:id workspace)}
+                  {:access_granted false})))
+  (t2/delete! :model/Workspace (:id workspace)))

enterprise/backend/src/metabase_enterprise/workspaces/models/workspace_dependency.clj

@@ -0,0 +1,17 @@
+(ns metabase-enterprise.workspaces.models.workspace-dependency
+  "Model for WorkspaceDependency - edges between workspace transforms and their dependencies."
+  (:require
+   [metabase.models.interface :as mi]
+   [methodical.core :as methodical]
+   [toucan2.core :as t2]))
+
+(methodical/defmethod t2/table-name :model/WorkspaceDependency [_model] :workspace_dependency)
+
+(doto :model/WorkspaceDependency
+  (derive :metabase/model)
+  (derive :hook/created-at-timestamped?))
+
+(t2/deftransforms :model/WorkspaceDependency
+  {:from_entity_type mi/transform-keyword
+   :to_entity_type   mi/transform-keyword
+   :from_entity_id   mi/transform-trim})

enterprise/backend/src/metabase_enterprise/workspaces/models/workspace_input.clj

@@ -0,0 +1,11 @@
+(ns metabase-enterprise.workspaces.models.workspace-input
+  "Model for WorkspaceInput - external tables that workspace transforms consume."
+  (:require
+   [methodical.core :as methodical]
+   [toucan2.core :as t2]))
+
+(methodical/defmethod t2/table-name :model/WorkspaceInput [_model] :workspace_input)
+
+(doto :model/WorkspaceInput
+  (derive :metabase/model)
+  (derive :hook/timestamped?))

enterprise/backend/src/metabase_enterprise/workspaces/models/workspace_input_external.clj

@@ -0,0 +1,11 @@
+(ns metabase-enterprise.workspaces.models.workspace-input-external
+  "Model for WorkspaceInputExternal - external tables that enclosed external transforms consume."
+  (:require
+   [methodical.core :as methodical]
+   [toucan2.core :as t2]))
+
+(methodical/defmethod t2/table-name :model/WorkspaceInputExternal [_model] :workspace_input_external)
+
+(doto :model/WorkspaceInputExternal
+  (derive :metabase/model)
+  (derive :hook/timestamped?))

enterprise/backend/src/metabase_enterprise/workspaces/models/workspace_log.clj

@@ -0,0 +1,70 @@
+(ns metabase-enterprise.workspaces.models.workspace-log
+  (:require
+   [java-time.api :as t]
+   [metabase.models.interface :as mi]
+   [metabase.util.i18n :refer [deferred-tru]]
+   [methodical.core :as methodical]
+   [toucan2.core :as t2]))
+
+(methodical/defmethod t2/table-name :model/WorkspaceLog [_model] :workspace_log)
+
+(doto :model/WorkspaceLog
+  (derive :metabase/model)
+  (derive :hook/timestamped?))
+
+(t2/deftransforms :model/WorkspaceLog
+  {:task   mi/transform-keyword
+   :status mi/transform-keyword})
+
+(defn- task->description
+  "Return a human-readable description for a workspace task."
+  [task]
+  (case task
+    :workspace-setup    (deferred-tru "Setting up the workspace")
+    :database-isolation (deferred-tru "Provisioning database isolation")
+    :mirror-entities    (deferred-tru "Mirroring entities")
+    :grant-read-access  (deferred-tru "Granting permissions")
+    (name task)))
+
+(t2/define-after-select :model/WorkspaceLog
+  [{:keys [task] :as log}]
+  (assoc log :description (task->description task)))
+
+(defn start!
+  "Create a log entry for a workspace setup task. Returns the created log."
+  [workspace-id task]
+  (t2/insert-returning-instance! :model/WorkspaceLog
+                                 {:workspace_id workspace-id
+                                  :task         task
+                                  :started_at   (t/offset-date-time)
+                                  :status       :started}))
+
+(defn- complete!
+  [status log-id & [message]]
+  (assert (#{:success :failure} status) "It can only be either success or failure")
+  (let [data (cond-> {:completed_at (t/offset-date-time)
+                      :status       status}
+               message (assoc :message message))]
+    (t2/update! :model/WorkspaceLog log-id data)))
+
+(defn success!
+  "Task was completed successfully"
+  [log-id & [message]]
+  (complete! :success log-id message))
+
+(defn failure!
+  "Task has failed"
+  [log-id & [message]]
+  (complete! :failure log-id message))
+
+(defmacro track!
+  "Wrap body with automatic logging: starts a log entry, marks success on completion, failure on exception."
+  [workspace-id task & body]
+  `(let [log# (start! ~workspace-id ~task)]
+     (try
+       (let [result# (do ~@body)]
+         (success! (:id log#))
+         result#)
+       (catch Exception e#
+         (failure! (:id log#) (ex-message e#))
+         (throw e#)))))

enterprise/backend/src/metabase_enterprise/workspaces/models/workspace_merge.clj

@@ -0,0 +1,14 @@
+(ns metabase-enterprise.workspaces.models.workspace-merge
+  "Model for WorkspaceMerge - tracks batch merge events with commit messages.
+   Survives workspace deletion through inlined workspace_name."
+  (:require
+   [methodical.core :as methodical]
+   [toucan2.core :as t2]))
+
+;;; -------------------------------------------------- Model Setup --------------------------------------------------
+
+(methodical/defmethod t2/table-name :model/WorkspaceMerge [_model] :workspace_merge)
+
+(doto :model/WorkspaceMerge
+  (derive :metabase/model)
+  (derive :hook/created-at-timestamped?))

enterprise/backend/src/metabase_enterprise/workspaces/models/workspace_merge_transform.clj

@@ -0,0 +1,15 @@
+(ns metabase-enterprise.workspaces.models.workspace-merge-transform
+  "Model for WorkspaceMergeTransform - tracks individual transform merges.
+   Linked to WorkspaceMerge for batch merges, standalone for single-transform merges.
+   Survives workspace deletion through inlined workspace_name."
+  (:require
+   [methodical.core :as methodical]
+   [toucan2.core :as t2]))
+
+;;; -------------------------------------------------- Model Setup --------------------------------------------------
+
+(methodical/defmethod t2/table-name :model/WorkspaceMergeTransform [_model] :workspace_merge_transform)
+
+(doto :model/WorkspaceMergeTransform
+  (derive :metabase/model)
+  (derive :hook/created-at-timestamped?))

enterprise/backend/src/metabase_enterprise/workspaces/models/workspace_output.clj

@@ -0,0 +1,15 @@
+(ns metabase-enterprise.workspaces.models.workspace-output
+  "Model for WorkspaceOutput - tables that workspace transforms produce."
+  (:require
+   [metabase.models.interface :as mi]
+   [methodical.core :as methodical]
+   [toucan2.core :as t2]))
+
+(methodical/defmethod t2/table-name :model/WorkspaceOutput [_model] :workspace_output)
+
+(doto :model/WorkspaceOutput
+  (derive :metabase/model)
+  (derive :hook/timestamped?))
+
+(t2/deftransforms :model/WorkspaceOutput
+  {:ref_id mi/transform-trim})

enterprise/backend/src/metabase_enterprise/workspaces/models/workspace_output_external.clj

@@ -0,0 +1,11 @@
+(ns metabase-enterprise.workspaces.models.workspace-output-external
+  "Model for WorkspaceOutputExternal - tables that enclosed external transforms produce."
+  (:require
+   [methodical.core :as methodical]
+   [toucan2.core :as t2]))
+
+(methodical/defmethod t2/table-name :model/WorkspaceOutputExternal [_model] :workspace_output_external)
+
+(doto :model/WorkspaceOutputExternal
+  (derive :metabase/model)
+  (derive :hook/timestamped?))

enterprise/backend/src/metabase_enterprise/workspaces/models/workspace_transform.clj

@@ -0,0 +1,49 @@
+(ns metabase-enterprise.workspaces.models.workspace-transform
+  "Model for WorkspaceTransform - holds the changeset of transforms being created
+   and edited within a workspace."
+  (:require
+   [clojure.string :as str]
+   [medley.core :as m]
+   [metabase.lib-be.core :as lib-be]
+   [metabase.lib.core :as lib]
+   [metabase.models.interface :as mi]
+   [methodical.core :as methodical]
+   [toucan2.core :as t2]))
+
+(methodical/defmethod t2/table-name :model/WorkspaceTransform [_model] :workspace_transform)
+
+(methodical/defmethod t2/primary-keys :model/WorkspaceTransform [_model] [:ref_id])
+
+(doto :model/WorkspaceTransform
+  (derive :metabase/model)
+  (derive :hook/timestamped?)
+  (derive :hook/entity-id))
+
+;; TODO (chris 2025/12/11) we need to share a bunch of stuff with transforms, i think we'll need to reorganize modules
+;;      suggestion: add a transforms-interfaces module which both transforms and workspaces depend on.
+
+(defn- transform-source-out-DUPLICATED [m]
+  (-> m
+      mi/json-out-without-keywordization
+      (update-keys keyword)
+      (m/update-existing :query lib-be/normalize-query)
+      (m/update-existing :type keyword)
+      (m/update-existing :source-incremental-strategy #(update-keys % keyword))))
+
+(defn- transform-source-in-DUPLICATED [m]
+  (-> m
+      (m/update-existing :query (comp lib/prepare-for-serialization lib-be/normalize-query))
+      mi/json-in))
+
+(t2/deftransforms :model/WorkspaceTransform
+  {:ref_id {:in identity :out str/trim}
+   :source {:out transform-source-out-DUPLICATED, :in transform-source-in-DUPLICATED}
+   :target mi/transform-json})
+
+(t2/define-before-insert :model/WorkspaceTransform
+  [instance]
+  ;; Ref id can not be added here due to mysql t2 bug
+  (when-not (string? (not-empty (:ref_id instance)))
+    (throw (ex-info "ref_id required for WorkspaceTransform insertion."
+                    {:instance instance})))
+  instance)

enterprise/backend/src/metabase_enterprise/workspaces/types.clj

@@ -0,0 +1,161 @@
+(ns metabase-enterprise.workspaces.types
+  (:require
+   [metabase.util.malli.registry :as mr]
+   [metabase.util.malli.schema :as ms]))
+
+(mr/def ::appdb-id ms/PositiveInt)
+
+(mr/def ::ref-id [:string {:min 1 :api/regex #".+"}])
+
+(def entity-types
+  "The kinds of entities we can store within a Workspace."
+  [{:name  "Transform"
+    :key   :transform
+    :group :transforms
+    :model :model/Transform}])
+
+(mr/def ::entity-type (into [:enum] (map :key) entity-types))
+
+(mr/def ::entity-grouping (into [:enum] (map :group) entity-types))
+
+;; Map like {:transforms [1 2 3]}
+(mr/def ::entity-map
+  [:map-of ::entity-grouping [:sequential ms/PositiveInt]])
+
+(mr/def ::execution-result
+  [:map
+   [:status [:enum :succeeded :failed]]
+   [:start_time {:optional true} [:maybe some?]]
+   [:end_time {:optional true} [:maybe some?]]
+   [:message {:optional true} [:maybe :string]]
+   [:table [:map
+            [:name :string]
+            [:schema {:optional true} [:maybe :string]]]]])
+
+;;; ---------------------------------------- Graph/Problem Types ----------------------------------------
+
+;; Node types used in workspace graphs and problem detection
+(mr/def ::node-type [:enum :input-table :external-transform :workspace-transform])
+
+(mr/def ::table-coord
+  "Logical reference to a table by database, schema, and name."
+  [:map
+   [:db_id ::appdb-id]
+   [:schema [:maybe :string]]
+   [:table :string]])
+
+(mr/def ::node-ref
+  "Reference to a node in the graph or a related entity."
+  [:map
+   [:type ::node-type]
+   [:id [:or ::appdb-id ::ref-id]]
+   [:name {:optional true} :string]])
+
+;;; ---------------------------------------- Problem Types ----------------------------------------
+
+;; Problem type definitions with metadata for FE display and merge-blocking behavior
+;; See validation.clj docstring for full documentation table
+
+(def problem-types
+  "All problem types with their metadata.
+
+   Each entry has:
+   - :description - human-readable explanation
+   - :severity - :error, :warning, or :info
+   - :block-merge - whether this problem should prevent merging
+   - :static? - true if determinable from metadata alone, false if requires runtime info
+
+   ## Categories
+
+   Dependency-based (about output state) - prefix indicates who depends on the output:
+   - unused-*              : nothing depends on this output
+   - internal-downstream-* : transforms within the workspace graph depend on this
+   - external-downstream-* : transforms outside the workspace depend on this
+
+   Structural (about graph shape) - prefix indicates scope of the issue:
+   - internal-* : between workspace transforms only
+   - external-* : involves global transforms (upstream or downstream)"
+  {;; No dependents (informational)
+   :unused/not-run {:description   "Output hasn't been created yet, but nothing depends on it"
+                    :severity      :info
+                    :block-merge false
+                    :static?       true}
+   :unused/stale   {:description   "Output is stale (needs re-run), but nothing depends on it"
+                    :severity      :info
+                    :block-merge false
+                    :static?       true}
+   :unused/failed  {:description   "Transform failed on last run, but nothing depends on it"
+                    :severity      :error
+                    :block-merge false
+                    :static?       false}
+
+   ;; Internal dependents (blocks workspace progress)
+   :internal-downstream/not-run {:description   "Output hasn't been created yet, other workspace transforms need it"
+                                 :severity      :warning
+                                 :block-merge true
+                                 :static?       true}
+   :internal-downstream/stale   {:description   "Output is stale, other workspace transforms need fresh data"
+                                 :severity      :warning
+                                 :block-merge true
+                                 :static?       true}
+   :internal-downstream/failed  {:description   "Transform failed on last run, other workspace transforms need it"
+                                 :severity      :error
+                                 :block-merge true
+                                 :static?       false}
+
+   ;; External dependents (would affect things after merge)
+   :external-downstream/not-run       {:description   "Output hasn't been created yet, external transforms depend on it"
+                                       :severity      :warning
+                                       :block-merge true
+                                       :static?       true}
+   :external-downstream/stale         {:description   "Output is stale, external transforms are using outdated data"
+                                       :severity      :warning
+                                       :block-merge true
+                                       :static?       true}
+   :external-downstream/removed-field {:description   "Field was removed that external transforms reference"
+                                       :severity      :error
+                                       :block-merge true
+                                       :static?       true}
+   :external-downstream/removed-table {:description   "Table was removed, external transforms will stop receiving updates"
+                                       :severity      :warning
+                                       :block-merge false
+                                       :static?       true}
+
+   ;; Structural issues (conflicts/cycles)
+   :internal/target-conflict {:description   "Multiple workspace transforms target the same table"
+                              :severity      :error
+                              :block-merge true
+                              :static?       true}
+   :internal/cycle           {:description   "Circular dependency between workspace transforms"
+                              :severity      :error
+                              :block-merge true
+                              :static?       true}
+   :external/target-conflict {:description   "Workspace transform conflicts with an existing global transform's target"
+                              :severity      :error
+                              :block-merge true
+                              :static?       true}
+   :external/cycle           {:description   "Workspace changes would create a circular dependency with global transforms"
+                              :severity      :error
+                              :block-merge true
+                              :static?       true}})
+
+(mr/def ::problem-type (into [:enum] (keys problem-types)))
+
+(mr/def ::severity [:enum :error :warning :info])
+
+;; Categories derived from problem-type namespaces
+(mr/def ::problem-category
+  (into [:enum] (distinct (map (comp keyword namespace) (keys problem-types)))))
+
+;; Problem names derived from problem-type names
+(mr/def ::problem-name
+  (into [:enum] (distinct (map (comp keyword name) (keys problem-types)))))
+
+(mr/def ::problem
+  "A problem detected during workspace validation."
+  [:map
+   [:category ::problem-category]
+   [:problem ::problem-name]
+   [:severity ::severity]
+   [:block_merge :boolean]
+   [:data :map]])

enterprise/backend/src/metabase_enterprise/workspaces/util.clj

@@ -0,0 +1,167 @@
+(ns metabase-enterprise.workspaces.util
+  (:require
+   [clojure.string :as str]
+   [metabase.system.core :as system]))
+
+(defn assert-transform!
+  "Test whether we support the given entity type within workspaces yet.
+   Named for the only case we support currently, to make call sites assumptions more obvious."
+  [entity-type]
+  (when (not= "transform" (name entity-type))
+    (throw (ex-info "Only transform entity type is supported"
+                    {:status-code 400
+                     :entity-type entity-type}))))
+
+(defn assert-transforms!
+  "Test that only supported types are given in the given list.
+   Named for the only case we support currently, to make call sites assumptions more obvious."
+  [entities]
+  (when-let [other-types (seq (remove #{:transform} (map :entity-type entities)))]
+    (throw (ex-info "Only transform entities are currently supported"
+                    {:status-code       400
+                     :unsupported-types other-types}))))
+
+(defn- toposort-visit [node child->parents visited result]
+  (cond
+    (visited node) [visited result]
+    :else (let [parents (child->parents node [])
+                [visited' result'] (reduce (fn [[v r] p]
+                                             (toposort-visit p child->parents v r))
+                                           [(conj visited node) result]
+                                           parents)]
+            [visited' (conj result' node)])))
+
+(defn toposort-dfs
+  "Perform a topological sort using depth-first search.
+   Takes a map from child nodes to their parent nodes (dependencies).
+   Returns nodes in topological order (dependencies before dependents)."
+  [child->parents]
+  ;; TODO (Chris 2025-11-20): Detect cycles and throw an error. (In practice inputs will never be cyclic, but still.)
+  (let [all-nodes (set (keys child->parents))]
+    (loop [visited   #{}
+           result    []
+           remaining all-nodes]
+      (if (empty? remaining)
+        result
+        (let [node (first remaining)
+              [visited' result'] (toposort-visit node child->parents visited result)]
+          (recur visited' result' (disj remaining node)))))))
+
+;;; Naming
+
+;; re-using https://github.com/metabase/metabase/pull/61887/commits/c92e4a9cc451c61a13fef19ed9d6107873b17f07
+;; (original ws isolation code)
+(defn- instance-uuid-slug
+  "Create a slug from the site UUID, taking the first character of each section."
+  [site-uuid-string]
+  (->> (str/split site-uuid-string #"-")
+       (map first)
+       (apply str)))
+
+;; WARNING: Changing this prefix requires backwards compatibility handling for existing workspaces.
+;; The prefix is used to identify isolation namespaces in the database, and existing workspaces
+;; will have namespaces created with the current prefix.
+(def ^:private isolated-prefix "mb__isolation")
+
+(defn isolation-namespace-name
+  "Generate namespace/database name for workspace isolation following mb__isolation_<slug>_<workspace-id> pattern.
+  Uses 'namespace' as the generic term that maps to 'schema' in Postgres, 'database' in ClickHouse, etc."
+  [workspace]
+  (assert (some? (:id workspace)) "Workspace must have an :id")
+  (let [instance-slug      (instance-uuid-slug (str (system/site-uuid)))
+        clean-workspace-id (str/replace (str (:id workspace)) #"[^a-zA-Z0-9]" "_")]
+    (format "%s_%s_%s" isolated-prefix instance-slug clean-workspace-id)))
+
+(defn isolated-table-name
+  "Generate name for a table mirroring transform target table in the isolated database namespace.
+   Returns schema__name when schema is present, or __name when schema is nil (to distinguish from global tables)."
+  [schema name]
+  ;; TODO: This naming scheme is not guaranteed to give a unique name, even if it's likely
+  ;; to always be unique in practice. Consider adding a hash suffix or conflict detection
+  ;; before merging to master.
+  (if schema
+    (format "%s__%s" schema name)
+    (format "__%s" name)))
+
+(defn isolation-user-name
+  "Generate username for workspace isolation."
+  [workspace]
+  (let [instance-slug (instance-uuid-slug (str (system/site-uuid)))]
+    (format "%s_%s_%s" isolated-prefix instance-slug (:id workspace))))
+
+(def ^:private password-char-sets
+  "Character sets for password generation. Cycles through these to ensure representation from each."
+  ["ABCDEFGHJKLMNPQRSTUVWXYZ"
+   "abcdefghjkmnpqrstuvwxyz"
+   "123456789"
+   "!#$%&*+-="])
+
+(defn random-isolated-password
+  "Generate a random password suitable for most database engines.
+   Ensures the password contains characters from all sets (uppercase, lowercase, digits, special)
+   by cycling through the character sets. Result is shuffled for randomness."
+  []
+  (->> (cycle password-char-sets)
+       (take (+ 32 (rand-int 32)))
+       (map rand-nth)
+       shuffle
+       (apply str)))
+
+;;; -------------------------------------------------- Cute Names --------------------------------------------------
+
+(def ^:private adjectives
+  "Adjectives for generating cute ref IDs, inspired by Docker's naming scheme."
+  ["admiring" "adoring" "affectionate" "agitated" "amazing" "angry" "awesome"
+   "beautiful" "blissful" "bold" "boring" "brave" "busy" "charming" "clever"
+   "cool" "compassionate" "competent" "condescending" "confident" "cranky"
+   "crazy" "dazzling" "determined" "distracted" "dreamy" "eager" "ecstatic"
+   "elastic" "elated" "elegant" "eloquent" "epic" "exciting" "fervent"
+   "festive" "flamboyant" "focused" "friendly" "frosty" "funny" "gallant"
+   "gifted" "goofy" "gracious" "great" "happy" "hardcore" "heuristic" "hopeful"
+   "hungry" "infallible" "inspiring" "intelligent" "interesting" "jolly"
+   "jovial" "keen" "kind" "laughing" "loving" "lucid" "magical" "modest"
+   "musing" "mystifying" "naughty" "nervous" "nice" "nifty" "nostalgic"
+   "objective" "optimistic" "peaceful" "pedantic" "pensive" "practical"
+   "priceless" "quirky" "quizzical" "recursing" "relaxed" "reverent" "romantic"
+   "sad" "serene" "sharp" "silly" "sleepy" "stoic" "strange" "stupefied"
+   "suspicious" "sweet" "tender" "thirsty" "trusting" "unruffled" "upbeat"
+   "vibrant" "vigilant" "vigorous" "wizardly" "wonderful" "xenodochial" "youthful"
+   "zealous" "zen"])
+
+(def ^:private animals
+  "Animals for generating cute ref IDs."
+  ["albatross" "alligator" "alpaca" "ant" "anteater" "antelope" "armadillo"
+   "baboon" "badger" "bat" "bear" "beaver" "bee" "bison" "boar" "buffalo"
+   "butterfly" "camel" "capybara" "caribou" "cat" "caterpillar" "cheetah"
+   "chicken" "chimpanzee" "chinchilla" "cobra" "condor" "cormorant" "coyote"
+   "crab" "crane" "crocodile" "crow" "deer" "dingo" "dog" "dolphin" "donkey"
+   "dove" "dragonfly" "duck" "eagle" "echidna" "eel" "elephant" "elk" "emu"
+   "falcon" "ferret" "finch" "firefly" "flamingo" "fox" "frog" "gazelle"
+   "gerbil" "giraffe" "goat" "goose" "gopher" "gorilla" "grasshopper" "grouse"
+   "hamster" "hare" "hawk" "hedgehog" "heron" "hippopotamus" "hornet" "horse"
+   "hummingbird" "hyena" "ibex" "iguana" "impala" "jackal" "jaguar" "jellyfish"
+   "kangaroo" "kingfisher" "kiwi" "koala" "komodo" "kookaburra" "lemur"
+   "leopard" "lion" "lizard" "llama" "lobster" "lynx" "magpie" "mallard"
+   "manatee" "mandrill" "marmot" "meerkat" "mink" "mole" "mongoose" "monkey"
+   "moose" "moth" "mouse" "mule" "narwhal" "newt" "nightingale" "ocelot"
+   "octopus" "okapi" "opossum" "orangutan" "orca" "oryx" "osprey" "ostrich"
+   "otter" "owl" "ox" "panda" "panther" "parrot" "partridge" "peacock"
+   "pelican" "penguin" "pheasant" "pig" "pigeon" "platypus" "pony" "porcupine"
+   "porpoise" "puma" "quail" "rabbit" "raccoon" "ram" "raven" "reindeer"
+   "rhinoceros" "salamander" "salmon" "sardine" "scorpion" "seahorse" "seal"
+   "shark" "sheep" "shrew" "skunk" "sloth" "snail" "snake" "sparrow" "spider"
+   "squid" "squirrel" "starfish" "stingray" "stork" "swallow" "swan" "tapir"
+   "tiger" "toad" "toucan" "turkey" "turtle" "viper" "vulture" "wallaby"
+   "walrus" "warthog" "wasp" "weasel" "whale" "wolf" "wolverine" "wombat"
+   "woodpecker" "yak" "zebra"])
+
+(defn generate-name
+  "Generate a cute adjective-animal style name. Making sure it's unique is your job."
+  []
+  (str (rand-nth adjectives) "-" (rand-nth animals)))
+
+(defn generate-ref-id
+  "Generate a cute adjective-animal style ref ID with a random suffix.
+   Format: adjective-animal-xxxx (where xxxx is a random 4-char hex suffix)"
+  []
+  (str (generate-name) "-" (format "%04x" (rand-int 65536))))

enterprise/backend/src/metabase_enterprise/workspaces/validation.clj

@@ -0,0 +1,279 @@
+(ns metabase-enterprise.workspaces.validation
+  "Validation of workspace changes against downstream dependencies.
+
+   ASSUMPTION: All transforms in the workspace have been run, and their outputs are not stale.
+   This validation checks the *current* isolated table schema against external transform requirements.
+
+   ## Problem Types
+
+   See `metabase-enterprise.workspaces.types/problem-types` for the full list of problem types
+   with their descriptions, severity levels, and merge-blocking behavior.
+
+   ## Currently Implemented
+
+   | Category            | Problem       | Description                                                    |
+   |---------------------|---------------|----------------------------------------------------------------|
+   | unused              | not-run       | Output hasn't been created, nothing depends on it              |
+   | internal-downstream | not-run       | Output hasn't been created, other workspace transforms need it |
+   | external-downstream | not-run       | Output hasn't been created, external transforms need it        |
+   | external-downstream | removed-field | Field was removed that external transforms reference           |"
+  (:require
+   [metabase-enterprise.workspaces.types :as ws.t]
+   [metabase.lib-be.core :as lib-be]
+   [metabase.lib.core :as lib]
+   [metabase.lib.metadata.protocols :as lib.metadata.protocols]
+   [toucan2.core :as t2]))
+
+(set! *warn-on-reflection* true)
+
+;;;; ---------------------------------------- Metadata Provider Override ----------------------------------------
+
+(defn- make-field-override-provider
+  "Create a metadata provider that overrides a table's fields with a different set of fields.
+   Used to simulate what external transforms would see after a merge.
+
+   - `base-provider`: the underlying metadata provider
+   - `target-table-id`: the global table ID whose fields we're overriding
+   - `replacement-fields`: the fields from the isolated table (what fields will exist after merge)"
+  [base-provider target-table-id replacement-fields]
+  (let [replacement-field-names (into #{} (map :name) replacement-fields)
+        ;; TODO we probably want to do one query for *all* the tables we care about, earlier in our validation.
+        table-field-id?         (t2/select-fn-set :id [:model/Field :id] :table_id target-table-id)]
+    (reify
+      lib.metadata.protocols/MetadataProvider
+      (database [_this]
+        (lib.metadata.protocols/database base-provider))
+      (metadatas [_this metadata-spec]
+       ;; Yes, for some reason :id is actually a set of ids
+        (let [{spec-type :lib/type spec-field-ids :id} metadata-spec]
+          (if (and (= :metadata/column spec-type) (some table-field-id? spec-field-ids))
+            ;; Return replacement fields with :active based on whether they exist
+            (let [original-fields (lib.metadata.protocols/metadatas base-provider metadata-spec)]
+              (map (fn [field]
+                     (if (contains? replacement-field-names (:name field))
+                       field
+                       (assoc field :active false)))
+                   original-fields))
+            ;; Delegate everything else
+            (lib.metadata.protocols/metadatas base-provider metadata-spec))))
+      (setting [_this setting-key]
+        (lib.metadata.protocols/setting base-provider setting-key))
+
+      lib.metadata.protocols/CachedMetadataProvider
+      (cached-metadatas [_this metadata-type metadata-ids]
+        (lib.metadata.protocols/cached-metadatas base-provider metadata-type metadata-ids))
+      (store-metadata! [_this a-metadata]
+        (lib.metadata.protocols/store-metadata! base-provider a-metadata))
+      (cached-value [_this k not-found]
+        (lib.metadata.protocols/cached-value base-provider k not-found))
+      (cache-value! [_this k v]
+        (lib.metadata.protocols/cache-value! base-provider k v))
+      (has-cache? [_this]
+        (lib.metadata.protocols/has-cache? base-provider))
+      (clear-cache! [_this]
+        (lib.metadata.protocols/clear-cache! base-provider)))))
+
+;;;; ---------------------------------------- External Transform Discovery ----------------------------------------
+
+;; TODO we could join these extra fields onto the graph before calling into this namespace, and save coupling
+(defn- workspace-outputs
+  "Get all workspace outputs with their global and isolated table info.
+   Includes both workspace transform outputs and enclosed external transform outputs."
+  [workspace-id]
+  (let [ws-outputs  (t2/select [:model/WorkspaceOutput
+                                :id :ref_id :db_id
+                                :global_schema :global_table :global_table_id
+                                :isolated_schema :isolated_table :isolated_table_id]
+                               :workspace_id workspace-id)
+        ;; External outputs use transform_id (int) instead of ref_id (string)
+        ;; Map transform_id to ref_id for compatibility with the rest of the validation code
+        ext-outputs (map #(assoc % :ref_id (:transform_id %) :external? true)
+                         (t2/select [:model/WorkspaceOutputExternal
+                                     :id :transform_id :db_id
+                                     :global_schema :global_table :global_table_id
+                                     :isolated_schema :isolated_table :isolated_table_id]
+                                    :workspace_id workspace-id))]
+    (concat ws-outputs ext-outputs)))
+
+(defn- ids-for-type [entities desired-node-type]
+  (for [{:keys [node-type id]} entities, :when (= node-type desired-node-type)] id))
+
+(defn- checked-out-transform-ids
+  "Get the global IDs of transforms that are checked out into this workspace.
+   Extracts workspace-transform ref_ids from the graph and looks up their global_ids."
+  [{:keys [entities] :as _graph}]
+  (if-let [ref-ids (seq (ids-for-type entities :workspace-transform))]
+    ;; TODO if we keep track of the global_id properties when building the graph, we can save this query.
+    (t2/select-fn-set :global_id
+                      [:model/WorkspaceTransform :global_id]
+                      :ref_id [:in ref-ids]
+                      {:where [:not= :global_id nil]})
+    #{}))
+
+(defn- enclosed-transform-ids
+  "Get the IDs of external transforms that are enclosed by the workspace graph.
+   These transforms run within the workspace, so they don't need further static validation."
+  [{:keys [entities] :as _graph}]
+  (ids-for-type entities :external-transform))
+
+(def ^:private table? #{:table})
+
+(defn- internal-dependents
+  "Build a map of non-table ids to the non-table ids that directly depend on it (internal to workspace).
+   This is essentially an inversion of the dependencies map, with some filtering."
+  [{:keys [dependencies] :as _graph}]
+  ;; :dependencies is {child #{parents...}}, we need to invert to {parent #{children...}}
+  (reduce (fn [acc [{child-type :node-type, child-id :id} parents]]
+            (if (table? child-type)
+              acc
+              (reduce (fn [acc {parent-type :node-type, parent-id :id}]
+                        (if (table? parent-type)
+                          acc
+                          (update acc parent-id (fnil conj #{}) child-id)))
+                      acc
+                      parents)))
+          {}
+          dependencies))
+
+(defn- external-transform-dependents
+  "Get external transforms that depend on a given table (by global_table_id).
+   Excludes transforms that are checked out or enclosed in the workspace."
+  [global-table-id checked-out-ids enclosed-ids]
+  (when global-table-id
+    (let [dependent-transform-ids (t2/select-fn-set :from_entity_id
+                                                    [:model/Dependency :from_entity_id]
+                                                    :to_entity_type :table
+                                                    :to_entity_id global-table-id
+                                                    :from_entity_type :transform)
+          ;; Remove checked out and enclosed transforms
+          external-ids            (-> dependent-transform-ids
+                                      (disj nil)
+                                      (as-> ids (apply disj ids checked-out-ids))
+                                      (as-> ids (apply disj ids enclosed-ids)))]
+      (when (seq external-ids)
+        (t2/select [:model/Transform :id :name :source] :id [:in external-ids])))))
+
+;;;; ---------------------------------------- Validation Logic ----------------------------------------
+
+(defn- validate-transform-against-fields
+  "Check if a transform would break given a modified set of fields.
+   Returns bad refs if the transform's query references fields that don't exist in replacement-fields."
+  [transform global-table-id replacement-fields]
+  (let [db-id (get-in transform [:source :query :database])]
+    (when db-id
+      (let [base-provider     (lib-be/application-database-metadata-provider db-id)
+            override-provider (make-field-override-provider base-provider global-table-id replacement-fields)
+            query             (lib/query override-provider (get-in transform [:source :query]))]
+        (lib/find-bad-refs query)))))
+
+(defn- get-table-fields
+  "Get all active fields for a table by ID."
+  [table-id]
+  (when table-id
+    (t2/select [:model/Field :id :name :base_type :semantic_type]
+               :table_id table-id
+               :active true)))
+
+(defn- make-problem
+  "Construct a problem map with type metadata from ws.t/problem-types.
+   Splits the namespaced problem-type into :category and :problem keys."
+  [problem-type data]
+  (let [{:keys [severity block-merge description]} (get ws.t/problem-types problem-type)]
+    {:category    (keyword (namespace problem-type))
+     :problem     (keyword (name problem-type))
+     :severity    severity
+     :block_merge block-merge
+     :description description
+     :data        data}))
+
+(defn- problems-for-output
+  "Find problems related to a single workspace output.
+   Returns a sequence of problem maps."
+  [output checked-out-ids enclosed-ids internal-dependents-map]
+  (let [{:keys [ref_id db_id global_schema global_table global_table_id
+                isolated_table_id external?]} output
+        ;; For external outputs, ref_id is actually the transform_id (an int)
+        transform-type           (if external? :external-transform :workspace-transform)
+        external-transforms      (external-transform-dependents global_table_id checked-out-ids enclosed-ids)
+        has-external-dependents? (seq external-transforms)
+        internal-dependents      (get internal-dependents-map ref_id)
+        has-internal-dependents? (seq internal-dependents)
+        table-coord              {:db_id db_id :schema global_schema :table global_table}]
+
+    (cond
+      ;; Case 1: Isolated table doesn't exist yet
+      (nil? isolated_table_id)
+      (cond
+        ;; External transforms depend on this output that doesn't exist
+        has-external-dependents?
+        [(make-problem :external-downstream/not-run
+                       {:output     table-coord
+                        :transform  {:type transform-type
+                                     :id   ref_id}
+                        :dependents (mapv (fn [{:keys [id name]}]
+                                            {:type :external-transform
+                                             :id   id
+                                             :name name})
+                                          external-transforms)})]
+        ;; Internal workspace transforms depend on this output that doesn't exist
+        has-internal-dependents?
+        [(make-problem :internal-downstream/not-run
+                       {:output     table-coord
+                        :transform  {:type transform-type
+                                     :id   ref_id}
+                        :dependents (mapv (fn [dep-ref-id]
+                                            {:type :workspace-transform
+                                             :id   dep-ref-id})
+                                          internal-dependents)})]
+        ;; No dependents - just informational
+        :else
+        [(make-problem :unused/not-run
+                       {:output    table-coord
+                        :transform {:type transform-type
+                                    :id   ref_id}})])
+
+      ;; Case 2: Isolated table exists - check for field breakages
+      has-external-dependents?
+      (let [isolated-fields (get-table-fields isolated_table_id)]
+        (into []
+              (mapcat (fn [transform]
+                        (when-let [bad-refs (validate-transform-against-fields
+                                             transform global_table_id isolated-fields)]
+                          [(make-problem :external-downstream/removed-field
+                                         {:output    table-coord
+                                          :transform {:type :external-transform
+                                                      :id   (:id transform)
+                                                      :name (:name transform)}
+                                          :bad-refs  bad-refs})])))
+              external-transforms))
+
+      ;; Case 3: No problems
+      :else [])))
+
+;;;; ---------------------------------------- Public API ----------------------------------------
+
+(defn find-downstream-problems
+  "Find problems that would affect transforms outside the workspace after merge.
+
+   Takes the workspace graph (from `ws.dag/path-induced-subgraph`) as an argument.
+
+   Returns a sequence of problem maps, each with:
+   - :category    - the problem category (e.g. :unused, :internal-downstream, :external-downstream)
+   - :problem     - the specific problem (e.g. :not-run, :removed-field)
+   - :severity    - :error, :warning, or :info
+   - :block-merge - whether this problem should prevent merging
+   - :data        - further data, depending on type
+
+   Currently implemented problem types (category + problem):
+   -              :unused/not-run       - output table hasn't been created (informational, no dependents)
+   - :internal-downstream/not-run       - output table hasn't been created, other workspace transforms need it
+   - :external-downstream/not-run       - output table hasn't been created, but external transforms depend on it
+   - :external-downstream/removed-field - a field was removed that external transforms need"
+  [workspace-id graph]
+  (let [outputs         (workspace-outputs workspace-id)
+        checked-out-ids (checked-out-transform-ids graph)
+        enclosed-ids    (enclosed-transform-ids graph)
+        dependents      (internal-dependents graph)]
+    (into []
+          (mapcat #(problems-for-output % checked-out-ids enclosed-ids dependents))
+          outputs)))

enterprise/backend/test/metabase_enterprise/dependencies/calculation_test.clj

@@ -181,6 +181,20 @@
                 :table #{checkins-id venues-id}}
                (calculation/upstream-deps:transform transform)))))))
 
+(deftest ^:parallel upstream-deps-python-transform-test
+  (mt/with-premium-features #{:transforms}
+    (let [products-id (mt/id :products)
+          orders-id (mt/id :orders)]
+      (mt/with-temp [:model/Transform transform {:name "Test Transform"
+                                                 :source {:type :python
+                                                          :source-tables {"PRODUCTS" products-id
+                                                                          "ORDERS" orders-id}
+                                                          :body "..."}
+                                                 :target {:schema "PUBLIC"
+                                                          :name "test_output"}}]
+        (is (= {:table #{products-id orders-id}}
+               (calculation/upstream-deps:transform transform)))))))
+
 (deftest ^:parallel upstream-deps-card-native-with-parameter-source-test
   (let [mp (mt/metadata-provider)
         products-id (mt/id :products)

enterprise/backend/test/metabase_enterprise/serialization/models/entity_id_test.clj

@@ -107,7 +107,19 @@
     :model/ConnectionImpersonation
     :model/CloudMigration
     :model/Comment
-    :model/CommentReaction})
+    :model/CommentReaction
+    ;; TODO (lbrdnk 2025/12/17): I've added rest of the workspace models here as Workspace was present. I believe
+    ;; going forward all of that will be available for export. We should revisit this later in the project.
+    :model/Workspace
+    :model/WorkspaceDependency
+    :model/WorkspaceInput
+    :model/WorkspaceInputExternal
+    :model/WorkspaceLog
+    :model/WorkspaceMerge
+    :model/WorkspaceMergeTransform
+    :model/WorkspaceOutput
+    :model/WorkspaceOutputExternal
+    :model/WorkspaceTransform})
 
 (deftest ^:parallel comprehensive-entity-id-test
   (let [entity-id-models (->> (v2.entity-ids/toucan-models)

enterprise/backend/test/metabase_enterprise/transforms/api/transform_job_test.clj

@@ -65,9 +65,11 @@
   (testing "GET /api/ee/transform-job/:id/transforms"
     (mt/with-premium-features #{:transforms}
       (let [crowberto-id (mt/user->id :crowberto)]
-        (mt/with-temp [:model/Transform {transform1-id :id} {:name "tr1" :creator_id crowberto-id}
-                       :model/Transform {transform2-id :id} {:name "tr2" :creator_id crowberto-id}
-                       :model/Transform _transform3 {}
+        (mt/with-temp [:model/Transform {transform1-id :id} {:name "tr1" :creator_id crowberto-id
+                                                             :target {:database (mt/id)}}
+                       :model/Transform {transform2-id :id} {:name "tr2" :creator_id crowberto-id
+                                                             :target {:database (mt/id)}}
+                       :model/Transform _transform3 {:target {:database (mt/id)}}
                        :model/TransformTag {tag-id :id} {}
                        :model/TransformTransformTag _ {:transform_id transform1-id :tag_id tag-id :position 0}
                        :model/TransformTransformTag _ {:transform_id transform2-id :tag_id tag-id :position 0}

enterprise/backend/test/metabase_enterprise/transforms/api_test.clj

@@ -11,6 +11,7 @@
                                                      with-transform-cleanup!]]
    [metabase-enterprise.transforms.util :as transforms.util]
    [metabase.driver :as driver]
+   [metabase.lib-be.metadata.jvm :as lib.metadata.jvm]
    [metabase.lib.core :as lib]
    [metabase.lib.metadata :as lib.metadata]
    [metabase.query-processor :as qp]
@@ -278,6 +279,139 @@
             (is (=? [{:id t2-id}]
                     (mt/user-http-request :crowberto :get 200 "ee/transform" :tag_ids [tag2-id])))))))))
 
+(deftest filter-transforms-by-type-test
+  (testing "should be able to filter transforms by source type"
+    (mt/test-drivers (mt/normal-drivers-with-feature :transforms/table)
+      (mt/with-premium-features #{:transforms :transforms-python}
+        (let [mp (mt/metadata-provider)
+              nq (lib/native-query mp "select 1")]
+          (mt/with-temp [:model/Transform {native-transform-id :id}
+                         {:name   "Native Transform"
+                          :source {:type  "query"
+                                   :query nq}
+                          :target {:type "table"
+                                   :name (str "test_native_" (u/generate-nano-id))}}
+                         :model/Transform {python-transform-id :id}
+                         {:name   "Python Transform"
+                          :source {:type          "python"
+                                   :body          "print('hello')"
+                                   :source-tables {}}
+                          :target {:type     "table"
+                                   :name     (str "test_python_" (u/generate-nano-id))
+                                   :database (mt/id)}}]
+            (testing "filter by native type"
+              (let [results (mt/user-http-request :crowberto :get 200 "ee/transform" :type ["native"])]
+                (is (some #(= native-transform-id (:id %)) results))
+                (is (not (some #(= python-transform-id (:id %)) results)))))
+            (testing "filter by python type"
+              (let [results (mt/user-http-request :crowberto :get 200 "ee/transform" :type ["python"])]
+                (is (some #(= python-transform-id (:id %)) results))
+                (is (not (some #(= native-transform-id (:id %)) results)))))
+            (testing "filter by both types returns all"
+              (let [results (mt/user-http-request :crowberto :get 200 "ee/transform" :type ["native" "python"])]
+                (is (some #(= native-transform-id (:id %)) results))
+                (is (some #(= python-transform-id (:id %)) results))))))))))
+
+(deftest filter-transforms-by-database-id-test
+  (testing "should be able to filter transforms by database_id"
+    (mt/test-drivers (mt/normal-drivers-with-feature :transforms/table)
+      (mt/with-premium-features #{:transforms}
+        (mt/with-temp [:model/Database {other-db-id :id} {:engine :h2 :details {}}
+                       :model/Transform {transform1-id :id} {:name   "Transform for main DB"
+                                                             :source {:type  "query"
+                                                                      :query {:database (mt/id)
+                                                                              :type     "native"
+                                                                              :native   {:query         "SELECT 1"
+                                                                                         :template-tags {}}}}
+                                                             :target_db_id (mt/id)
+                                                             :target {:type "table"
+                                                                      :name (str "test_main_" (u/generate-nano-id))}}
+                       :model/Transform {transform2-id :id} {:name   "Transform for other DB"
+                                                             :source {:type  "query"
+                                                                      :query {:database other-db-id
+                                                                              :type     "native"
+                                                                              :native   {:query         "SELECT 2"
+                                                                                         :template-tags {}}}}
+                                                             :target_db_id other-db-id
+                                                             :target {:type "table"
+                                                                      :name (str "test_other_" (u/generate-nano-id))}}]
+          (testing "filter by main database id"
+            (let [results (mt/user-http-request :crowberto :get 200 "ee/transform" :database_id (mt/id))]
+              (is (some #(= transform1-id (:id %)) results))
+              (is (not (some #(= transform2-id (:id %)) results)))))
+          (testing "filter by other database id"
+            (let [results (mt/user-http-request :crowberto :get 200 "ee/transform" :database_id other-db-id)]
+              (is (some #(= transform2-id (:id %)) results))
+              (is (not (some #(= transform1-id (:id %)) results)))))
+          (testing "filter by non-existent database returns empty for our transforms"
+            (let [results (mt/user-http-request :crowberto :get 200 "ee/transform" :database_id 999999)]
+              (is (not (some #(= transform1-id (:id %)) results)))
+              (is (not (some #(= transform2-id (:id %)) results))))))))))
+
+(deftest filter-transforms-by-database-id-target-test
+  (testing "should match transforms where target database matches"
+    (mt/test-drivers (mt/normal-drivers-with-feature :transforms/table)
+      (mt/with-premium-features #{:transforms :transforms-python}
+        (mt/with-temp [:model/Database {target-db-id :id} {:engine :h2 :details {}}
+                       :model/Transform {transform-id :id} {:name   "Python Transform with target DB"
+                                                            :source {:type          "python"
+                                                                     :body          "print('hello')"
+                                                                     :source-tables {}}
+                                                            :target_db_id target-db-id
+                                                            :target {:type     "table"
+                                                                     :name     (str "test_target_" (u/generate-nano-id))
+                                                                     :database target-db-id}}]
+          (testing "filter by target database id"
+            (let [results (mt/user-http-request :crowberto :get 200 "ee/transform" :database_id target-db-id)]
+              (is (some #(= transform-id (:id %)) results)))))))))
+
+(deftest filter-transforms-combined-test
+  (testing "should be able to combine database_id and type filters"
+    (mt/test-drivers (mt/normal-drivers-with-feature :transforms/table)
+      (mt/with-premium-features #{:transforms :transforms-python}
+        (let [nq (lib/native-query (mt/metadata-provider) "select 1")]
+          (mt/with-temp [:model/Database {other-db-id :id} {:engine :h2 :details {}}
+                         :model/Transform {query-main-id :id}
+                         {:name   "Query on main DB"
+                          :source_type :native
+                          :source {:type  "query"
+                                   :query nq}
+                          :target {:type "table"
+                                   :name (str "test_qm_" (u/generate-nano-id))}}
+                         :model/Transform {python-main-id :id}
+                         {:name   "Python on main DB"
+                          :source_type :python
+                          :source {:type          "python"
+                                   :body          "print('hello')"
+                                   :source-tables {}}
+                          :target {:type     "table"
+                                   :name     (str "test_pm_" (u/generate-nano-id))
+                                   :database (mt/id)}}
+                         :model/Transform {query-other-id :id}
+                         {:name   "Query on other DB"
+                          :source_type :native
+                          :source {:type  "query"
+                                   :query (lib/native-query
+                                           (lib.metadata.jvm/application-database-metadata-provider other-db-id)
+                                           "select 2")}
+                          :target {:type "table"
+                                   :name (str "test_qo_" (u/generate-nano-id))
+                                   :database other-db-id}}]
+            (testing "filter by main database and query type"
+              (let [results (mt/user-http-request :crowberto :get 200 "ee/transform"
+                                                  :database_id (mt/id)
+                                                  :type ["native"])]
+                (is (some #(= query-main-id (:id %)) results))
+                (is (not (some #(= python-main-id (:id %)) results)))
+                (is (not (some #(= query-other-id (:id %)) results)))))
+            (testing "filter by main database and python type"
+              (let [results (mt/user-http-request :crowberto :get 200 "ee/transform"
+                                                  :database_id (mt/id)
+                                                  :type ["python"])]
+                (is (some #(= python-main-id (:id %)) results))
+                (is (not (some #(= query-main-id (:id %)) results)))
+                (is (not (some #(= query-other-id (:id %)) results)))))))))))
+
 (deftest get-transforms-test
   (mt/test-drivers (mt/normal-drivers-with-feature :transforms/table)
     (mt/with-premium-features #{:transforms}

enterprise/backend/test/metabase_enterprise/transforms/util_test.clj

@@ -108,3 +108,44 @@
                 (catch Exception _e
                   ;; Ignore cleanup errors
                   nil)))))))))
+
+;;; ------------------------------------------------------------
+;;; Filter xf tests
+;;; ------------------------------------------------------------
+
+(deftest ^:parallel matching-timestamp?-test
+  (testing "matching-timestamp? checks if a timestamp falls within a date range [start, end)"
+    (let [matching-timestamp? #'transforms.util/matching-timestamp?
+          field-path          [:start_time]
+          range-jan-feb       {:start "2024-01-01T00:00:00Z" :end "2024-02-01T00:00:00Z"}
+          range-start-only    {:start "2024-01-01T00:00:00Z" :end nil}
+          range-end-only      {:start nil :end "2024-02-01T00:00:00Z"}]
+
+      (testing "with both start and end bounds"
+        (are [expected timestamp]
+             (= expected (matching-timestamp? {:start_time timestamp} field-path range-jan-feb))
+          nil   nil                       ; missing field returns nil
+          true  "2024-01-15T12:00:00Z"    ; timestamp in middle of range
+          false "2023-12-15T12:00:00Z"    ; timestamp before range
+          false "2024-02-15T12:00:00Z"    ; timestamp after range
+          true  "2024-01-01T00:00:00Z"    ; start boundary is inclusive
+          true  "2024-02-01T00:00:00Z"))  ; end boundary is inclusive too 🤷
+
+      (testing "with only start bound"
+        (are [expected timestamp]
+             (= expected (matching-timestamp? {:start_time timestamp} field-path range-start-only))
+          true  "2024-01-15T12:00:00Z"    ; timestamp after start
+          true  "2024-02-15T12:00:00Z"    ; any timestamp after start
+          false "2023-12-15T12:00:00Z"))  ; timestamp before start
+
+      (testing "with only end bound"
+        (are [expected timestamp]
+             (= expected (matching-timestamp? {:start_time timestamp} field-path range-end-only))
+          true  "2024-01-15T12:00:00Z"    ; timestamp before end
+          true  "2023-12-15T12:00:00Z"    ; any timestamp before end
+          false "2024-02-15T12:00:00Z"))  ; timestamp after end
+
+      (testing "returns nil when field value is missing"
+        (are [job] (nil? (matching-timestamp? job field-path range-jan-feb))
+          {}
+          {:other "value"})))))

enterprise/backend/test/metabase_enterprise/workspaces/dag_abstract.clj

@@ -0,0 +1,113 @@
+(ns metabase-enterprise.workspaces.dag-abstract
+  "Abstract graph solver using shorthand notation for testing.
+
+   Shorthand uses keywords like :x1, :t2, :m3 where:
+   - :x<n> is a transform
+   - :t<n> is a table (source/generated)
+   - :m<n> is a model (card)"
+  (:require
+   [clojure.set :as set]
+   [flatland.ordered.map :as ordered-map]
+   [metabase-enterprise.workspaces.util :as ws.u]
+   [metabase.util :as u]))
+
+;;;; Shorthand notation helpers
+
+(defn- related [t id]
+  (keyword (str (name t) (subs (name id) 1))))
+
+(def ^:private x->t (partial related :t))
+
+(defn is?
+  "Check if id is of type t (e.g., (is? :x :x1) => true)."
+  [t id]
+  (= (name t) (str (first (name id)))))
+
+(defn- lexico [id]
+  (let [n (name id)]
+    [(parse-long (subs n 1))
+     ({\x 1 \t 2 \m 3} (first n))]))
+
+(defn expand-shorthand
+  "As shorthand, we can use transforms in the place of their induced tables.
+   This function expands the graph to insert the induced tables, and replace the corresponding references."
+  [dependencies]
+  (let [xs (set (filter #(is? :x %) (concat (keys dependencies) (mapcat val dependencies))))]
+    (into (sorted-map-by #(compare (lexico %1) (lexico %2)))
+          (merge (zipmap (map x->t xs) (map vector xs))
+                 (into {} (filter (comp #(is? :t %) key)) dependencies)
+                 (update-vals
+                  (into {} (remove (comp #(is? :t %) key)) dependencies)
+                  (fn [deps] (->> deps
+                                  (map (fn [id]
+                                         (if (is? :x id)
+                                           (x->t id)
+                                           id)))
+                                  (sort-by lexico)
+                                  (vec))))))))
+
+;;;; Graph traversal helpers
+
+(defn- children [dependencies]
+  (reduce
+   (fn [acc [child parents]]
+     (reduce (fn [acc p] (update acc p u/conjv child)) acc parents))
+   (sorted-map-by #(compare (lexico %1) (lexico %2)))
+   dependencies))
+
+(defn- ->ts [ids]
+  (into #{}
+        (keep (fn [id]
+                (cond (is? :t id) id
+                      (is? :x id) (x->t id))))
+        ids))
+
+;;;; Toposort
+
+(defn- toposort-map [child->parents]
+  (let [child->parents (if (map? child->parents) child->parents (into {} child->parents))]
+    (into (ordered-map/ordered-map)
+          (keep (fn [n] (when-let [deps (get child->parents n)] [n deps])))
+          (ws.u/toposort-dfs child->parents))))
+
+;;;; Abstract path-induced subgraph solver
+
+(def ^:private max-iterations 100)
+
+(defn path-induced-subgraph
+  "Abstract solver for path-induced subgraph using shorthand notation."
+  [{:keys [check-outs dependencies] :as _graph}]
+  (let [->parents  dependencies
+        ->children (children dependencies)]
+    (loop [iteration  1
+           below      check-outs
+           above      check-outs
+           seen-down? check-outs
+           seen-up?   check-outs
+           to-descend check-outs
+           to-ascend  check-outs]
+      (if (and (empty? to-descend) (empty? to-ascend))
+        (let [nodes    (set/intersection above below)
+              entities (remove #(is? :t %) nodes)
+              tables   (sort-by lexico (filter #(is? :t %) nodes))]
+          {:check-outs   (sort-by lexico check-outs)
+           :inputs       (sort-by lexico (remove nodes (->ts (mapcat ->parents check-outs))))
+           :tables       tables
+           :transforms   (sort-by lexico (filter #(is? :x %) nodes))
+           :entities     (sort-by lexico entities)
+           :dependencies (apply dissoc
+                                (toposort-map
+                                 (for [n nodes]
+                                   [n (vec (filter nodes (get dependencies n)))]))
+                                tables)})
+        (if (> iteration max-iterations)
+          {:error "max iterations exceeded"}
+          (let [next-down (into #{} (comp (mapcat ->children) (remove seen-down?)) to-descend)
+                next-up   (into #{} (comp (mapcat ->parents) (remove seen-up?)) to-ascend)]
+            (recur (inc iteration)
+                   (into below next-down)
+                   (into above next-up)
+                   (into seen-down? next-down)
+                   (into seen-up? next-up)
+                   next-down
+                   next-up)))))))

enterprise/backend/test/metabase_enterprise/workspaces/dag_test.clj

@@ -0,0 +1,313 @@
+(ns metabase-enterprise.workspaces.dag-test
+  (:require
+   [clojure.string :as str]
+   [clojure.test :refer :all]
+   [flatland.ordered.map :as ordered-map]
+   [metabase-enterprise.workspaces.dag :as ws.dag]
+   [metabase-enterprise.workspaces.dag-abstract :as dag-abstract]
+   [metabase-enterprise.workspaces.impl :as ws.impl]
+   [metabase.app-db.core :as app-db]
+   [metabase.driver.sql.normalize :as sql.normalize]
+   [metabase.test :as mt]
+   [metabase.util :as u]
+   [toucan2.core :as t2]))
+
+(use-fixtures
+  :once
+  (fn [f]
+    (mt/with-premium-features [:dependencies :transforms :workspaces]
+      (mt/with-model-cleanup [:model/Dependency :model/Transform :model/Table]
+        (f)))))
+
+;;;; Example graphs for testing
+
+(def ^:private example-graph
+  {:x3  [:x1 :t2]
+   :x4  [:x3]
+   :m6  [:x4 :t5]
+   :m10 [:t9]
+   :x11 [:m10]
+   :m12 [:x11]
+   :m13 [:x11 :m12]})
+
+;;;; Test data helpers
+
+(defn- transform? [kw] (= \x (first (name kw))))
+(defn- table? [kw] (= \t (first (name kw))))
+(defn- kw->id [kw] (parse-long (subs (name kw) 1)))
+
+(defn- create-test-graph!
+  "Create test transforms and tables from shorthand notation, returning id mappings.
+
+   Shorthand uses keywords like :x1, :t2, :m3 where:
+   - :x<n> is a transform
+   - :t<n> is a table (source/generated)
+   - :m<n> is a model (card)
+
+   Returns a map from shorthand id to real database id, e.g. {:x1 123, :t2 456}
+
+   NOTE: Caller should wrap in mt/with-model-cleanup for proper cleanup."
+  [dependencies]
+  (let [schema     (str/replace (str (random-uuid)) "-" "_")
+        all-ids    (set (concat (keys dependencies)
+                                (mapcat val dependencies)))
+        transforms (filter transform? all-ids)
+        driver     (t2/select-one-fn :engine [:model/Database :engine] (mt/id))
+        normalize  #(sql.normalize/normalize-name driver %)
+        tables     (filter table? all-ids)
+        table-ids  (u/for-map [t tables]
+                     [t (t2/insert-returning-pk! :model/Table
+                                                 {:db_id  (mt/id)
+                                                  :schema (some-> schema normalize)
+                                                  :name   (normalize (str "test_table_" (kw->id t)))
+                                                  :active true})])
+        ;; Create transforms that reference their input tables
+        tx-ids     (u/for-map [tx transforms]
+                     (let [parent-tables (->> (get dependencies tx []) (filter table?) (map table-ids))
+                           id            (t2/insert-returning-pk! :model/Transform
+                                                                  {:name   (str "Test " (name tx))
+                                                                   :source {:type  :query
+                                                                            :query (if (seq parent-tables)
+                                                                                     #_{:database (mt/id)
+                                                                                        :type     :query
+                                                                                        :query    {:source-table (first parent-tables)
+                                                                                                   :joins        (for [pt (rest parent-tables)]
+                                                                                                                   {:source-table pt
+                                                                                                                    :condition    [:= 1 1]})}}
+                                                                                     {:database (mt/id)
+                                                                                      :type     :native
+                                                                                      :native   {:query (->> (t2/select-fn-vec #(str (:schema %) "." (:name %))
+                                                                                                                               [:model/Table :schema :name]
+                                                                                                                               :id [:in parent-tables])
+                                                                                                             (str/join ", ")
+                                                                                                             (str "SELECT * FROM "))}}
+                                                                                     {:database (mt/id)
+                                                                                      :type     :native
+                                                                                      :native   {:query "SELECT 1"}})}
+                                                                   :target {:type     "table"
+                                                                            :database (mt/id)
+                                                                            :schema   schema
+                                                                            :name     (str "test_table_" (kw->id tx))}})]
+                       [tx id]))]
+
+    ;; This is a workaround for the dependency between transforms and their output only being inserted on run.
+    (doseq [[tx-kw tx-id] tx-ids]
+      (app-db/update-or-insert! :model/Dependency
+                                {:to_entity_type   "transform"
+                                 :to_entity_id     tx-id
+                                 :from_entity_type "table"
+                                 :from_entity_id   (table-ids (keyword (str "t" (kw->id tx-kw))))}))
+
+    (merge tx-ids table-ids)))
+
+(defn- translate-result
+  "Translate result from real IDs back to shorthand notation for easier comparison."
+  [{:keys [inputs outputs entities dependencies] :as _result} id-map]
+  (let [reverse-map (u/for-map [[k v] id-map] [v k])
+        table->kw   (comp reverse-map :id)
+        node->kw    (fn [{:keys [node-type id]}]
+                      (reverse-map (case node-type
+                                     :table (:id id)
+                                     :external-transform id
+                                     :workspace-transform (t2/select-one-fn :global_id [:model/WorkspaceTransform :global_id] :ref_id id))))]
+    {:inputs       (into #{} (map table->kw) inputs)
+     :outputs      (into #{} (map table->kw) outputs)
+     :entities     (into #{} (map node->kw) entities)
+     :dependencies (u/for-map [[child parents] dependencies]
+                     [(node->kw child) (into #{} (map node->kw parents))])}))
+
+;;;; Tests
+
+(deftest path-induced-subgraph-shorthand-test
+  (testing "graph built from shorthand matches abstract solver"
+    (let [shorthand   {:x2 [:t1]}
+          id-map      (create-test-graph! (dag-abstract/expand-shorthand shorthand))
+          gtx         (t2/select-one :model/Transform (id-map :x2))]
+      ;; TODO make this nice and declarative too
+      (mt/with-temp [:model/Workspace          ws  {:name "Test Workspace", :database_id (mt/id)}
+                     :model/WorkspaceTransform wtx (merge
+                                                    (select-keys gtx [:name :source :target])
+                                                    {:workspace_id (:id ws)
+                                                     :global_id    (:id gtx)})]
+        (ws.impl/sync-transform-dependencies! ws wtx)
+        (let [entity     {:entity-type :transform, :id (:ref_id wtx)}
+              result     (ws.dag/path-induced-subgraph (:id ws) [entity])
+              translated (translate-result result id-map)]
+          (is (=? {:inputs       #{:t1}
+                   :outputs      #{:t2}
+                   :entities     #{:x2}
+                   :dependencies {:x2 #{:t1}}}
+                  translated)))))))
+
+(deftest path-induced-subgraph-larger-test
+  (testing "graph built from shorthand matches abstract solver"
+    ;; check-outs x2, x4
+    (let [shorthand   {:x1 [:t0]
+                       :x2 [:x1, :t10]
+                       :x3 [:x2, :t8]
+                       :x4 [:x3]
+                       :x5 [:x2, :x4, :t9]}
+          id-map     (create-test-graph! (dag-abstract/expand-shorthand shorthand))
+          gtx-2       (t2/select-one :model/Transform (id-map :x2))
+          gtx-4       (t2/select-one :model/Transform (id-map :x4))
+          fork        (fn [ws gtx]
+                        (merge
+                         (select-keys gtx [:name :source :target])
+                         {:workspace_id (:id ws)
+                          :global_id    (:id gtx)}))]
+      ;; TODO make a convenience method / method for doing these checkouts too
+      (mt/with-temp [:model/Workspace          ws    {:name "Test Workspace", :database_id (mt/id)}
+                     :model/WorkspaceTransform wtx-2 (fork ws gtx-2)
+                     :model/WorkspaceTransform wtx-4 (fork ws gtx-4)]
+        (ws.impl/sync-transform-dependencies! ws wtx-2)
+        (ws.impl/sync-transform-dependencies! ws wtx-4)
+        (let [entities   (for [wtx [wtx-2 wtx-4]]
+                           {:entity-type :transform, :id (:ref_id wtx)})
+              result     (ws.dag/path-induced-subgraph (:id ws) entities)
+              translated (translate-result result id-map)]
+          (is (=? {:inputs       #{:t1 :t8 :t10}
+                   :outputs      #{:t2 :t3 :t4}
+                   :entities     #{:x2 :x3 :x4}
+                   :dependencies {:x2 #{:t1 :t10}
+                                  :x3 #{:x2 :t8}
+                                  :x4 #{:x3}}}
+                  translated)))))))
+
+(deftest expand-solver-test
+  (testing "expand-shorthand inserts interstitial nodes for transform output tables"
+    (is (= {:t1  [:x1]
+            :x3  [:t1 :t2]
+            :t3  [:x3]
+            :x4  [:t3]
+            :t4  [:x4]
+            :m6  [:t4 :t5]
+            :m10 [:t9]
+            :x11 [:m10]
+            :t11 [:x11]
+            :m12 [:t11]
+            :m13 [:t11 :m12]}
+           (dag-abstract/expand-shorthand example-graph)))))
+
+(deftest abstract-path-induced-subgraph-test
+  (testing "path-induced-subgraph computes correct result for example graph"
+    (is (= {:check-outs   [:x3 :m6 :m10 :m13]
+            :inputs       [:t1 :t2 :t5 :t9]
+            :tables       [:t3 :t4 :t11]
+            :transforms   [:x3 :x4 :x11]
+            :entities     [:x3 :x4 :m6 :m10 :x11 :m12 :m13]
+            :dependencies (ordered-map/ordered-map
+                           :m10 []
+                           :x11 [:m10]
+                           :m12 [:t11]
+                           :m13 [:t11 :m12]
+                           :x3  []
+                           :x4  [:t3]
+                           :m6  [:t4])}
+           (dag-abstract/path-induced-subgraph
+            {:check-outs   #{:x3 :m6 :m10 :m13}
+             :dependencies (dag-abstract/expand-shorthand example-graph)})))))
+
+;;;; Card dependency detection tests
+
+(deftest unsupported-dependency-no-transforms-test
+  (testing "empty input returns nil"
+    (is (nil? (ws.dag/unsupported-dependency? {})))
+    (is (nil? (ws.dag/unsupported-dependency? {:transforms []})))))
+
+(deftest unsupported-dependency-mbql-card-test
+  #_(testing "transform with card dependencies are unsupported"
+      (let [tx-with-no-dependencies               1
+            ;; These tests transforms must seem pretty redundant - but it's intentional: we may relax them one case at
+            ;; at time in the future.
+            ;; ----------------------
+            ;; We don't allow MBQL card dependencies, as we do not support re-mapping their references on execution.
+            ;; This is only a problem if the card depends on a table that is shadowed in the isolated schema, but we
+            ;; want to keep the semantics simple.
+            tx-with-direct-mbql-card-dependency   2
+            ;; Even a transitive dependency would need to be remapped.
+            tx-with-indirect-mbql-card-dependency 3
+            ;; In fact, we don't allow *any* card dependency for two reasons:
+            ;; 1. We don't yet support reference re-mapping across entity references.
+            ;; 2. It's an anti-pattern to build transforms on models, the relationship is intended to be the other way
+            ;;    around.
+            tx-with-sql-card-dependency           4]
+        (is (= nil (ws.dag/unsupported-dependency? {:transforms [1]})))
+        (is (= {:transforms [2 3 4]} (ws.dag/unsupported-dependency? {:transforms [1 2 3 4]}))))))
+
+(deftest collapse-test
+  (is (= {:x1 [:x2 :x3]
+          :x2 [:t3]
+          :x3 [:x5]
+          :x4 []
+          :x5 []}
+         (#'ws.dag/collapse
+          table?
+          {:x1 [:t1 :t2]
+           :t1 [:x2]
+           :t2 [:x3]
+           :x2 [:t3]
+           :x3 [:t4]
+           :t4 [:x5]
+           :t5 [:x4]
+           :x4 []
+           :x5 []}))))
+
+(defn tx->table [kw]
+  (when (transform? kw)
+    (keyword (str "t" (kw->id kw)))))
+
+(defn- solve-in-memory [init-nodes graph]
+  (let [tx-nodes (filter transform? init-nodes)
+        tables   (map tx->table tx-nodes)]
+    (#'ws.dag/path-induced-subgraph*
+     ;; Include all changeset targets in the init-nodes
+     (distinct (into init-nodes tables))
+     {:node-parents (dag-abstract/expand-shorthand graph)
+      :table?       table?
+      :table-sort   kw->id
+      :unwrap-table identity})))
+
+(defn- chain->deps [chain]
+  (reduce
+   (fn [deps [from to]]
+     (assoc deps from [to]))
+   {}
+   (partition 2 1 (reverse chain))))
+
+(deftest in-memory-path-induced-subgraph-test
+  (testing "singleton"
+    (is (= {:inputs       [:t1]
+            :outputs      [:t2]
+            :entities     [:x2]
+            :dependencies {:x2 [:t1]}}
+           (solve-in-memory [:x2] {:x2 [:t1]}))))
+
+  (testing "encloses middle of a chain"
+    (is (= {:inputs       [:t1]
+            :outputs      [:t2 :t3 :t4]
+            :entities     [:x2 :x3 :x4]
+            :dependencies {:x2 [:t1]
+                           :x3 [:x2]
+                           :x4 [:x3]}}
+           (solve-in-memory [:x2 :x4] (chain->deps [:x1 :x2 :x3 :x4 :x5])))))
+
+  (testing "larger graph"
+    (is (= {:inputs       [:t1 :t2 :t5 :t9]
+            :outputs      [:t3 :t4 :t11]
+            :entities     [:m10 :x11 :m12 :m13 :x3 :x4 :m6]
+            :dependencies {:m10 [:t9]
+                           :m12 [:x11]
+                           :m13 [:m12 :x11]
+                           :m6  [:x4 :t5]
+                           :x11 [:m10]
+                           :x3  [:t2 :t1]
+                           :x4  [:x3]}}
+           (solve-in-memory
+            [:x3 :m6 :m10 :m13]
+            {:x3  [:x1 :t2]
+             :x4  [:x3]
+             :m6  [:x4 :t5]
+             :m10 [:t9]
+             :x11 [:m10]
+             :m12 [:x11]
+             :m13 [:x11 :m12]})))))

enterprise/backend/test/metabase_enterprise/workspaces/dependencies_test.clj

@@ -0,0 +1,318 @@
+(ns metabase-enterprise.workspaces.dependencies-test
+  (:require
+   [clojure.test :refer :all]
+   [metabase-enterprise.workspaces.dependencies :as ws.deps]
+   [metabase-enterprise.workspaces.test-util :as ws.tu]
+   [metabase.lib.core :as lib]
+   [metabase.lib.metadata :as lib.metadata]
+   [metabase.test :as mt]
+   [toucan2.core :as t2]))
+
+(set! *warn-on-reflection* true)
+
+(ws.tu/ws-fixtures!)
+
+;;; ---------------------------------------- analyze-entity tests ----------------------------------------
+
+(deftest ^:parallel analyze-entity-query-transform-test
+  (testing "analyze-entity extracts dependencies from a query transform"
+    (let [mp        (mt/metadata-provider)
+          query     (lib/query mp (lib.metadata/table mp (mt/id :orders)))
+          transform {:source {:type  "query"
+                              :query query}
+                     :target {:database (mt/id)
+                              :schema   "public"
+                              :name     "orders_with_products"}}
+          result    (ws.deps/analyze-entity :transform transform)]
+      (testing "output is extracted from target"
+        (is (= {:db_id  (mt/id)
+                :schema "public"
+                :table  "orders_with_products"}
+               (:output result))))
+      (testing "inputs contain the source table with table_id (since table exists)"
+        (let [inputs (:inputs result)
+              table-names (set (map :table inputs))]
+          (is (= 1 (count inputs)))
+          (is (contains? table-names (mt/format-name :orders)))
+          ;; MBQL queries have table_id since the tables must exist
+          (is (every? #(and (:db_id %)
+                            (:table %)
+                            (:table_id %))
+                      inputs)))))))
+
+(deftest ^:parallel analyze-entity-native-query-existing-table-test
+  (testing "analyze-entity extracts dependencies from native query referencing existing table"
+    (let [mp        (mt/metadata-provider)
+          query     (lib/native-query mp "SELECT * FROM ORDERS WHERE total > 100")
+          transform {:source {:type  "query"
+                              :query query}
+                     :target {:database (mt/id)
+                              :schema   "analytics"
+                              :name     "high_value_orders"}}
+          result    (ws.deps/analyze-entity :transform transform)]
+      (testing "output is extracted from target"
+        (is (= {:db_id  (mt/id)
+                :schema "analytics"
+                :table  "high_value_orders"}
+               (:output result))))
+      (testing "inputs include table_id since ORDERS table exists"
+        (let [inputs (:inputs result)]
+          ;; Native query parsing should detect ORDERS table reference and look up table_id
+          (is (pos? (count inputs)))
+          (is (every? #(and (:db_id %)
+                            (:table %)
+                            (:table_id %))
+                      inputs)))))))
+
+(deftest ^:parallel analyze-entity-native-query-nonexistent-table-test
+  (testing "analyze-entity handles native query referencing non-existent table"
+    (let [mp        (mt/metadata-provider)
+          ;; Reference a table that doesn't exist in the database
+          query     (lib/native-query mp "SELECT * FROM future_sales_data WHERE region = 'US'")
+          transform {:source {:type  "query"
+                              :query query}
+                     :target {:database (mt/id)
+                              :schema   "analytics"
+                              :name     "regional_sales"}}
+          result    (ws.deps/analyze-entity :transform transform)]
+      (testing "output is extracted from target"
+        (is (= {:db_id  (mt/id)
+                :schema "analytics"
+                :table  "regional_sales"}
+               (:output result))))
+      (testing "inputs have logical reference but no table_id (table doesn't exist)"
+        (let [inputs (:inputs result)]
+          ;; Should still parse the table reference even though table doesn't exist
+          (is (pos? (count inputs)))
+          ;; Has db_id and table name but NOT table_id
+          (is (every? #(and (:db_id %)
+                            (:table %))
+                      inputs))
+          ;; Verify table_id is nil or missing for non-existent tables
+          (is (every? #(nil? (:table_id %)) inputs)))))))
+
+(deftest ^:parallel analyze-entity-python-transform-test
+  (testing "analyze-entity extracts dependencies from a python transform"
+    (let [transform {:source {:type          "python"
+                              :source-tables {"orders"   (mt/id :orders)
+                                              "products" (mt/id :products)}
+                              :body          "def transform(orders, products): return orders"}
+                     :target {:database (mt/id)
+                              :schema   "public"
+                              :name     "python_result"}}
+          result    (ws.deps/analyze-entity :transform transform)]
+      (testing "output is extracted from target"
+        (is (= {:db_id  (mt/id)
+                :schema "public"
+                :table  "python_result"}
+               (:output result))))
+      (testing "inputs contain the source tables with table_ids"
+        (let [inputs (:inputs result)
+              table-names (set (map :table inputs))]
+          (is (= 2 (count inputs)))
+          (is (contains? table-names (mt/format-name :orders)))
+          (is (contains? table-names (mt/format-name :products)))
+          ;; Python transforms have table_ids since source-tables maps to existing table IDs
+          (is (every? :table_id inputs)))))))
+
+(deftest analyze-entity-asserts-transform-type-test
+  (testing "analyze-entity asserts entity-type is :transform"
+    (is (thrown-with-msg? Exception #"Only transform entity type is supported"
+                          (ws.deps/analyze-entity :card {})))))
+
+;;; ---------------------------------------- write-dependencies! tests ----------------------------------------
+
+(deftest write-dependencies-creates-output-test
+  (testing "write-dependencies! creates workspace_output record"
+    (mt/with-temp [:model/Workspace workspace {:name        "Test Workspace"
+                                               :database_id (mt/id)
+                                               :schema      "test_isolated_schema"}
+                   :model/WorkspaceTransform wt {:workspace_id (:id workspace)
+                                                 :name         "Test Transform"
+                                                 :source       {:type "query" :query {}}
+                                                 :target       {:database (mt/id)
+                                                                :schema   "public"
+                                                                :name     "test_output"}}]
+      (let [analysis {:output {:db_id  (mt/id)
+                               :schema "public"
+                               :table  "test_output"}
+                      :inputs []}]
+        (ws.deps/write-dependencies! (:id workspace) "test_isolated_schema" :transform (:ref_id wt) analysis)
+        (let [output (t2/select-one :model/WorkspaceOutput
+                                    :workspace_id (:id workspace)
+                                    :ref_id (:ref_id wt))]
+          (is (some? output))
+          (is (= (mt/id) (:db_id output)))
+          (is (= "public" (:global_schema output)))
+          (is (= "test_output" (:global_table output)))
+          (is (= "test_isolated_schema" (:isolated_schema output)))
+          (is (= "public__test_output" (:isolated_table output))))))))
+
+(deftest write-dependencies-creates-inputs-test
+  (testing "write-dependencies! creates workspace_input records for external dependencies"
+    (let [iso-schema "test_isolated_schema"]
+      (mt/with-temp [:model/Workspace workspace {:name        "Test Workspace"
+                                                 :database_id (mt/id)
+                                                 :schema      iso-schema}
+                     :model/WorkspaceTransform wt {:workspace_id (:id workspace)
+                                                   :name         "Test Transform"
+                                                   :source       {:type "query" :query {}}
+                                                   :target       {:database (mt/id)
+                                                                  :schema   "public"
+                                                                  :name     "test_output"}}]
+        (let [orders-table (t2/select-one [:model/Table :db_id :schema :name] :id (mt/id :orders))
+              analysis     {:output {:db_id  (mt/id)
+                                     :schema "public"
+                                     :table  "test_output"}
+                            :inputs [{:db_id  (:db_id orders-table)
+                                      :schema (:schema orders-table)
+                                      :table  (:name orders-table)}]}]
+          (ws.deps/write-dependencies! (:id workspace) iso-schema :transform (:ref_id wt) analysis)
+          (let [input (t2/select-one :model/WorkspaceInput
+                                     :workspace_id (:id workspace)
+                                     :table (:name orders-table))]
+            (is (some? input))
+            (is (= (:db_id orders-table) (:db_id input)))
+            (is (= (:name orders-table) (:table input)))))))))
+
+(deftest write-dependencies-creates-edges-test
+  (testing "write-dependencies! creates workspace_dependency edges"
+    (let [iso-schema "test_isolated_schema"]
+      (mt/with-temp [:model/Workspace workspace {:name        "Test Workspace"
+                                                 :database_id (mt/id)
+                                                 :schema      iso-schema}
+                     :model/WorkspaceTransform wt {:workspace_id (:id workspace)
+                                                   :name         "Test Transform"
+                                                   :source       {:type "query" :query {}}
+                                                   :target       {:database (mt/id)
+                                                                  :schema   "public"
+                                                                  :name     "test_output"}}]
+        (let [orders-table (t2/select-one [:model/Table :db_id :schema :name] :id (mt/id :orders))
+              analysis     {:output {:db_id  (mt/id)
+                                     :schema "public"
+                                     :table  "test_output"}
+                            :inputs [{:db_id  (:db_id orders-table)
+                                      :schema (:schema orders-table)
+                                      :table  (:name orders-table)}]}]
+          (ws.deps/write-dependencies! (:id workspace) iso-schema :transform (:ref_id wt) analysis)
+          (let [edges (t2/select :model/WorkspaceDependency
+                                 :workspace_id (:id workspace)
+                                 :from_entity_type :transform
+                                 :from_entity_id (:ref_id wt))]
+            (is (= 1 (count edges)))
+            (is (= :input (:to_entity_type (first edges))))))))))
+
+(deftest write-dependencies-internal-dependency-test
+  (testing "write-dependencies! links to workspace_output for internal dependencies"
+    (mt/with-temp [:model/Workspace workspace {:name        "Test Workspace"
+                                               :database_id (mt/id)
+                                               :schema      "test_isolated_schema"}
+                   :model/WorkspaceTransform wt1 {:workspace_id (:id workspace)
+                                                  :name         "Upstream Transform"
+                                                  :source       {:type "query" :query {}}
+                                                  :target       {:database (mt/id)
+                                                                 :schema   "public"
+                                                                 :name     "upstream_output"}}
+                   :model/WorkspaceTransform wt2 {:workspace_id (:id workspace)
+                                                  :name         "Downstream Transform"
+                                                  :source       {:type "query" :query {}}
+                                                  :target       {:database (mt/id)
+                                                                 :schema   "public"
+                                                                 :name     "downstream_output"}}]
+      ;; First, write dependencies for the upstream transform (creates the output)
+      (ws.deps/write-dependencies! (:id workspace) "test_isolated_schema" :transform (:ref_id wt1)
+                                   {:output {:db_id  (mt/id)
+                                             :schema "public"
+                                             :table  "upstream_output"}
+                                    :inputs []})
+
+      ;; Now write dependencies for downstream that depends on upstream's output
+      (ws.deps/write-dependencies! (:id workspace) "test_isolated_schema" :transform (:ref_id wt2)
+                                   {:output {:db_id  (mt/id)
+                                             :schema "public"
+                                             :table  "downstream_output"}
+                                    :inputs [{:db_id  (mt/id)
+                                              :schema "public"
+                                              :table  "upstream_output"}]})
+
+      (let [edges (t2/select :model/WorkspaceDependency
+                             :workspace_id (:id workspace)
+                             :from_entity_type :transform
+                             :from_entity_id (:ref_id wt2))]
+        (testing "creates edge to output (internal dependency)"
+          (is (= 1 (count edges)))
+          (is (= :output (:to_entity_type (first edges)))))
+        (testing "no workspace_input created for internal dependency"
+          (is (nil? (t2/select-one :model/WorkspaceInput
+                                   :workspace_id (:id workspace)
+                                   :table "upstream_output"))))))))
+
+(deftest write-dependencies-updates-on-change-test
+  (testing "write-dependencies! updates records and removes stale edges"
+    (mt/with-temp [:model/Workspace workspace {:name        "Test Workspace"
+                                               :database_id (mt/id)
+                                               :schema      "test_isolated_schema"}
+                   :model/WorkspaceTransform wt {:workspace_id (:id workspace)
+                                                 :name         "Test Transform"
+                                                 :source       {:type "query" :query {}}
+                                                 :target       {:database (mt/id)
+                                                                :schema   "public"
+                                                                :name     "test_output"}}]
+      (let [orders-table   (t2/select-one [:model/Table :db_id :schema :name] :id (mt/id :orders))
+            products-table (t2/select-one [:model/Table :db_id :schema :name] :id (mt/id :products))]
+        ;; First write with orders dependency
+        (ws.deps/write-dependencies! (:id workspace) "test_isolated_schema" :transform (:ref_id wt)
+                                     {:output {:db_id  (mt/id)
+                                               :schema "public"
+                                               :table  "test_output"}
+                                      :inputs [{:db_id  (:db_id orders-table)
+                                                :schema (:schema orders-table)
+                                                :table  (:name orders-table)}]})
+        (is (= 1 (t2/count :model/WorkspaceDependency :workspace_id (:id workspace))))
+
+        ;; Update to depend on products instead
+        (ws.deps/write-dependencies! (:id workspace) "test_isolated_schema" :transform (:ref_id wt)
+                                     {:output {:db_id  (mt/id)
+                                               :schema "public"
+                                               :table  "test_output"}
+                                      :inputs [{:db_id  (:db_id products-table)
+                                                :schema (:schema products-table)
+                                                :table  (:name products-table)}]})
+
+        (testing "old edge is removed"
+          (is (= 1 (t2/count :model/WorkspaceDependency :workspace_id (:id workspace)))))
+        (testing "new input is created"
+          (is (some? (t2/select-one :model/WorkspaceInput
+                                    :workspace_id (:id workspace)
+                                    :table (:name products-table)))))))))
+
+;;; ---------------------------------------- Integration test ----------------------------------------
+
+(deftest analyze-and-write-integration-test
+  (testing "Full flow: analyze a real transform and write its dependencies"
+    (let [mp    (mt/metadata-provider)
+          query (lib/query mp (lib.metadata/table mp (mt/id :orders)))]
+      (mt/with-temp [:model/Workspace workspace {:name        "Integration Test Workspace"
+                                                 :database_id (mt/id)
+                                                 :schema      "test_isolated_schema"}
+                     :model/WorkspaceTransform wt {:workspace_id (:id workspace)
+                                                   :name         "Orders Analysis"
+                                                   :source       {:type "query" :query {}}
+                                                   :target       {:database (mt/id)
+                                                                  :schema   "analytics"
+                                                                  :name     "orders_analysis"}}]
+        ;; Create the transform entity with the proper query (not from DB)
+        (let [transform-entity {:source {:type  "query"
+                                         :query query}
+                                :target {:database (mt/id)
+                                         :schema   "analytics"
+                                         :name     "orders_analysis"}}
+              analysis         (ws.deps/analyze-entity :transform transform-entity)]
+          (ws.deps/write-dependencies! (:id workspace) "test_isolated_schema" :transform (:ref_id wt) analysis)
+
+          (testing "output record created"
+            (is (= 1 (t2/count :model/WorkspaceOutput :workspace_id (:id workspace)))))
+          (testing "input record created for ORDERS table"
+            (is (= 1 (t2/count :model/WorkspaceInput :workspace_id (:id workspace)))))
+          (testing "dependency edge created"
+            (is (= 1 (t2/count :model/WorkspaceDependency :workspace_id (:id workspace))))))))))

enterprise/backend/test/metabase_enterprise/workspaces/drivers_test.clj

@@ -0,0 +1,20 @@
+(ns ^:mb/driver-tests metabase-enterprise.workspaces.drivers-test
+  (:require
+   [clojure.test :refer :all]
+   [metabase.driver :as driver]
+   [metabase.test :as mt]))
+
+(deftest drivers-support-workspaces-has-to-support-db-swapping-test
+  (mt/test-drivers (mt/normal-drivers-with-feature :workspace)
+    (let [db-swapped? (fn []
+                        (try
+                          (mt/run-mbql-query venues {:limit 1})
+                          false
+                          (catch Exception _e
+                            true)))]
+      (testing "db is swapped if being executed inside a macros"
+        (driver/with-swapped-connection-details (mt/id) {:user "unicorn"}
+          (is (db-swapped?))))
+
+      (testing "sanity check that it's not swapped outside of the macros"
+        (is (not (db-swapped?)))))))

enterprise/backend/test/metabase_enterprise/workspaces/e2e_test.clj

@@ -0,0 +1,79 @@
+(ns ^:mb/driver-tests metabase-enterprise.workspaces.e2e-test
+  (:require
+   [clojure.test :refer :all]
+   [metabase-enterprise.transforms.execute :as transforms.execute]
+   [metabase-enterprise.transforms.test-util :as transforms.tu]
+   [metabase-enterprise.workspaces.common :as ws.common]
+   [metabase-enterprise.workspaces.isolation :as ws.isolation]
+   [metabase-enterprise.workspaces.test-util :as ws.tu]
+   [metabase.driver :as driver]
+   [metabase.driver.sql.query-processor :as sql.qp]
+   [metabase.query-processor.preprocess :as qp.preprocess]
+   ^{:clj-kondo/ignore [:deprecated-namespace]}
+   [metabase.query-processor.store :as qp.store]
+   [metabase.test :as mt]
+   [metabase.util :as u]
+   [toucan2.core :as t2]))
+
+(defn- execute-workspace-transform!
+  "Execute a transform within workspace isolation context. For testing purposes."
+  [workspace ws-transform opts]
+  (ws.isolation/with-workspace-isolation workspace
+    (let [result (atom nil)]
+      (t2/with-transaction [_tx]
+        (let [transform (t2/insert-returning-instance!
+                         :model/Transform
+                         (select-keys ws-transform [:name :description :source :target]))]
+          (reset! result (transforms.execute/execute! transform opts))
+          ;; rather abort transaction
+          (t2/delete! :model/Transform (:id transform))))
+      @result)))
+
+(defn- mbql->native [query]
+  (qp.store/with-metadata-provider (mt/id)
+    (sql.qp/mbql->native driver/*driver* (qp.preprocess/preprocess query))))
+
+(deftest isolation-e2e-test
+  (mt/test-drivers (mt/normal-drivers-with-feature :workspace)
+    (transforms.tu/with-transform-cleanup! [output-table-name (str "test_table_1_" (mt/random-name))]
+      (mt/with-model-cleanup [:model/Transform :model/Workspace]
+        (mt/with-temp [:model/Transform {transform-id :id} {:name   "Transform 1"
+                                                            :source {:type  "query"
+                                                                     :query (mt/native-query (mbql->native (mt/mbql-query orders {:limit 3})))}
+                                                            :target {:type "table"
+                                                                     :name output-table-name
+                                                                     :database (mt/id)
+                                                                     :schema (t2/select-one-fn :schema :model/Table (mt/id :orders))}}]
+          (ws.tu/with-workspaces! [workspace {:name        (mt/random-name)
+                                              :database_id (mt/id)
+                                              :upstream    {:transforms [transform-id]}}]
+            (ws.common/add-to-changeset! (mt/user->id :crowberto) workspace
+                                         :transform transform-id
+                                         (t2/select-one :model/Transform transform-id))
+            (let [_workspace          (u/poll {:thunk      #(t2/select-one :model/Workspace (:id workspace))
+                                               :done?      #(= :ready (:status %))
+                                               :timeout-ms 5000})
+                  isolated-transform (t2/select-one :model/WorkspaceTransform :workspace_id (:id workspace))
+                  #_#_executed-transform (mt/with-current-user (mt/user->id :crowberto)
+                                           (ws.impl/run-transform! workspace isolated-transform))
+                  #_#_output-table       (-> executed-transform :table)]
+              ;; TODO: the table is synced but there are no fields even though the table and fields exist in the db
+              #_(testing "execute the transform with the original query is fine and the output is in an isolated schema"
+                  (u/poll {:thunk     #(t2/select-one :model/Table :name (:name output-table))
+                           :done?      some?
+                           :timeout-ms 1000})
+                  (transforms.tu/wait-for-table (:name output-table) 1000)
+                  (is (str/starts-with? (:schema output-table) "mb__isolation"))
+                  (is (= 1 (count (transforms.tu/table-rows (name output-table))))))
+
+              (testing "changing the query without granting access will fail"
+                (t2/update! :model/WorkspaceTransform
+                            {:ref_id (:ref_id isolated-transform)}
+                            {:source {:type  "query"
+                                      :query (mt/native-query (mbql->native (mt/mbql-query venues {:limit 1})))}})
+                (is (thrown-with-msg?
+                     Exception
+                     #"ERROR: permission denied for table.*"
+                     (execute-workspace-transform! workspace
+                                                   (t2/select-one :model/WorkspaceTransform :ref_id (:ref_id isolated-transform))
+                                                   {:run-method :manual})))))))))))

enterprise/backend/test/metabase_enterprise/workspaces/execute_test.clj

@@ -0,0 +1,196 @@
+(ns ^:mb/driver-tests metabase-enterprise.workspaces.execute-test
+  (:require
+   [clojure.string :as str]
+   [clojure.test :refer :all]
+   [metabase-enterprise.transforms.test-util :as transforms.tu]
+   [metabase-enterprise.workspaces.common :as ws.common]
+   [metabase-enterprise.workspaces.execute :as ws.execute]
+   [metabase-enterprise.workspaces.impl :as ws.impl]
+   [metabase-enterprise.workspaces.test-util :as ws.tu]
+   [metabase.test :as mt]
+   [toucan2.core :as t2]))
+
+(set! *warn-on-reflection* true)
+
+(ws.tu/ws-fixtures!)
+
+(deftest run-workspace-transform-no-input-test
+  (testing "Executing a workspace transform returns results and rolls back app DB records"
+    (transforms.tu/with-transform-cleanup! [output-table "ws_execute_test"]
+      (let [workspace    (ws.tu/create-ready-ws! "Execute Test Workspace")
+            db-id        (:database_id workspace)
+            ws-schema    (:schema workspace)
+            body         {:name   "Test Transform"
+                          :source {:type  "query"
+                                   :query (mt/native-query {:query "SELECT 1 as id, 'hello' as name"})}
+                          :target {:type     "table"
+                                   :database db-id
+                                   :schema   nil
+                                   :name     output-table}}
+            ws-transform (ws.common/add-to-changeset! (mt/user->id :crowberto) workspace :transform nil body)
+            before       {:xf    (t2/count :model/Transform)
+                          :xfrun (t2/count :model/TransformRun)}]
+
+        (testing "execution returns expected result structure"
+          (is (=? {:status     :succeeded
+                   :start_time some?
+                   :end_time   some?
+                   :table      {:name   #(str/includes? % output-table)
+                                :schema ws-schema}}
+                  (mt/with-current-user (mt/user->id :crowberto)
+                    (ws.impl/run-transform! workspace ws-transform))))
+          (is (=? {:last_run_at some?}
+                  (t2/select-one :model/WorkspaceTransform :ref_id (:ref_id ws-transform))))
+          (is (=? [{:workspace_id      (:id workspace)
+                    :global_table      output-table
+                    :global_schema     nil
+                    :global_table_id   nil
+                    :isolated_schema   string?
+                    :isolated_table    string?
+                    ;; TODO I think this is broken because of normalization breaking case equality
+                    #_#_:isolated_table_id number?}]
+                  (t2/select :model/WorkspaceOutput :ref_id (:ref_id ws-transform)))))
+
+        (testing "app DB records are rolled back"
+          (is (= before
+                 {:xf    (t2/count :model/Transform)
+                  :xfrun (t2/count :model/TransformRun)})))))))
+
+(deftest remap-python-source-test
+  (let [remap-python-source #'ws.execute/remap-python-source]
+    (testing "remaps to table ID when mapping has :id"
+      (let [table-mapping {[1 "public" "orders"] {:db-id  1
+                                                  :schema "ws_isolated_123"
+                                                  :table  "orders_isolated"
+                                                  :id     456}}
+            source        {:type          "python"
+                           :body          "import pandas as pd"
+                           :source-tables {"orders" {:database_id 1
+                                                     :schema      "public"
+                                                     :table       "orders"
+                                                     :table_id    123}}}]
+        (is (= {:type          "python"
+                :body          "import pandas as pd"
+                :source-tables {"orders" 456}}
+               (remap-python-source table-mapping source)))))
+
+    (testing "remaps to map format when mapping has nil :id"
+      (let [table-mapping {[1 "public" "orders"] {:db-id  1
+                                                  :schema "ws_isolated_123"
+                                                  :table  "orders_isolated"
+                                                  :id     nil}}
+            source        {:type          "python"
+                           :body          "import pandas as pd"
+                           :source-tables {"orders" {:database_id 1
+                                                     :schema      "public"
+                                                     :table       "orders"
+                                                     :table_id    123}}}]
+        (is (= {:type          "python"
+                :body          "import pandas as pd"
+                :source-tables {"orders" {:database_id 1
+                                          :schema      "ws_isolated_123"
+                                          :table       "orders_isolated"}}}
+               (remap-python-source table-mapping source)))))
+
+    (testing "leaves source-tables unchanged when no mapping exists"
+      (let [table-mapping {}
+            source        {:type          "python"
+                           :body          "import pandas as pd"
+                           :source-tables {"orders" {:database_id 1
+                                                     :schema      "public"
+                                                     :table       "orders"
+                                                     :table_id    123}}}]
+        (is (= source (remap-python-source table-mapping source)))))
+
+    (testing "remaps legacy integer to table ID when mapping has :id"
+      (let [table-mapping {123 {:db-id  1
+                                :schema "ws_isolated_123"
+                                :table  "orders_isolated"
+                                :id     456}}
+            source        {:type          "python"
+                           :body          "import pandas as pd"
+                           :source-tables {"orders" 123}}]
+        (is (= {:type          "python"
+                :body          "import pandas as pd"
+                :source-tables {"orders" 456}}
+               (remap-python-source table-mapping source)))))
+
+    (testing "remaps legacy integer to map format when mapping has nil :id"
+      (let [table-mapping {123 {:db-id  1
+                                :schema "ws_isolated_123"
+                                :table  "orders_isolated"
+                                :id     nil}}
+            source        {:type          "python"
+                           :body          "import pandas as pd"
+                           :source-tables {"orders" 123}}]
+        (is (= {:type          "python"
+                :body          "import pandas as pd"
+                :source-tables {"orders" {:database_id 1
+                                          :schema      "ws_isolated_123"
+                                          :table       "orders_isolated"}}}
+               (remap-python-source table-mapping source)))))
+
+    (testing "leaves legacy integer table-id unchanged when no mapping exists"
+      (let [table-mapping {}
+            source        {:type          "python"
+                           :body          "import pandas as pd"
+                           :source-tables {"orders" 123}}]
+        (is (= source (remap-python-source table-mapping source)))))
+
+    (testing "handles mixed formats with mappings for both"
+      (let [table-mapping {[1 "public" "orders"] {:db-id  1
+                                                  :schema "ws_isolated_123"
+                                                  :table  "orders_isolated"
+                                                  :id     456}
+                           789                    {:db-id  1
+                                                   :schema "ws_isolated_123"
+                                                   :table  "customers_isolated"
+                                                   :id     999}}
+            source        {:type          "python"
+                           :body          "import pandas as pd"
+                           :source-tables {"orders"    {:database_id 1
+                                                        :schema      "public"
+                                                        :table       "orders"
+                                                        :table_id    123}
+                                           "customers" 789}}]
+        (is (= {:type          "python"
+                :body          "import pandas as pd"
+                :source-tables {"orders"    456
+                                "customers" 999}}
+               (remap-python-source table-mapping source)))))
+
+    (testing "prefers table_id lookup over triple lookup for map format"
+      (let [table-mapping {123                    {:db-id  1
+                                                   :schema "ws_isolated_123"
+                                                   :table  "orders_by_id"
+                                                   :id     456}
+                           [1 "public" "orders"] {:db-id  1
+                                                  :schema "ws_isolated_123"
+                                                  :table  "orders_by_triple"
+                                                  :id     789}}
+            source        {:type          "python"
+                           :body          "import pandas as pd"
+                           :source-tables {"orders" {:database_id 1
+                                                     :schema      "public"
+                                                     :table       "orders"
+                                                     :table_id    123}}}]
+        (is (= {:type          "python"
+                :body          "import pandas as pd"
+                :source-tables {"orders" 456}}
+               (remap-python-source table-mapping source)))))
+
+    (testing "falls back to triple lookup when table_id not in mapping"
+      (let [table-mapping {[1 "public" "orders"] {:db-id  1
+                                                  :schema "ws_isolated_123"
+                                                  :table  "orders_isolated"
+                                                  :id     456}}
+            source        {:type          "python"
+                           :body          "import pandas as pd"
+                           :source-tables {"orders" {:database_id 1
+                                                     :schema      "public"
+                                                     :table       "orders"
+                                                     :table_id    999}}}]
+        (is (= {:type          "python"
+                :body          "import pandas as pd"
+                :source-tables {"orders" 456}}
+               (remap-python-source table-mapping source)))))))

enterprise/backend/test/metabase_enterprise/workspaces/impl_test.clj

@@ -0,0 +1,84 @@
+(ns metabase-enterprise.workspaces.impl-test
+  (:require
+   [clojure.test :refer :all]
+   [metabase-enterprise.workspaces.common :as ws.common]
+   [metabase-enterprise.workspaces.impl :as ws.impl]
+   [metabase-enterprise.workspaces.isolation :as ws.isolation]
+   [metabase-enterprise.workspaces.test-util :as ws.tu]
+   [metabase.lib.core :as lib]
+   [metabase.lib.metadata :as lib.metadata]
+   [metabase.test :as mt]
+   [toucan2.core :as t2]))
+
+(set! *warn-on-reflection* true)
+
+(ws.tu/ws-fixtures!)
+
+(deftest sync-transform-dependencies-test
+  (testing "sync-transform-dependencies! writes dependencies and grants access to external inputs"
+    (let [mp          (mt/metadata-provider)
+          query-a     (lib/query mp (lib.metadata/table mp (mt/id :orders)))
+          query-b     (lib/query mp (lib.metadata/table mp (mt/id :products)))
+          workspace   (ws.tu/create-provisional-ws! "Test Workspace")
+          grant-calls (atom [])]
+      ;; Set up mock BEFORE calling add-to-changeset! since it calls sync-transform-dependencies! internally
+      (mt/with-dynamic-fn-redefs [ws.isolation/grant-read-access-to-tables!
+                                  (fn [_database _workspace tables]
+                                    (swap! grant-calls conj (set (map :name tables))))]
+        (testing "Transform A depends on ORDERS"
+          (ws.common/add-to-changeset! (mt/user->id :crowberto) workspace
+                                       :transform nil
+                                       {:name   "Transform A"
+                                        :source {:type "query" :query query-a}
+                                        :target {:database (mt/id)
+                                                 :schema   "analytics"
+                                                 :name     "table_a"}})
+          (testing "creates output and input records"
+            (is (= 1 (t2/count :model/WorkspaceOutput :workspace_id (:id workspace))))
+            (is (= 1 (t2/count :model/WorkspaceInput :workspace_id (:id workspace)))))
+          (testing "input record has correct table name"
+            (is (= (mt/format-name :orders)
+                   (t2/select-one-fn :table :model/WorkspaceInput :workspace_id (:id workspace)))))
+          (testing "grants access to ORDERS"
+            (is (= 1 (count @grant-calls)))
+            (is (contains? (first @grant-calls) (mt/format-name :orders)))))
+
+        (testing "Transform B depends on PRODUCTS, table_a is internal output"
+          (reset! grant-calls [])
+          (ws.common/add-to-changeset! (mt/user->id :crowberto) workspace
+                                       :transform nil
+                                       {:name   "Transform B"
+                                        :source {:type "query" :query query-b}
+                                        :target {:database (mt/id)
+                                                 :schema   "analytics"
+                                                 :name     "table_b"}})
+          (testing "creates records for both transforms"
+            (is (= 2 (t2/count :model/WorkspaceOutput :workspace_id (:id workspace))))
+            (is (= 2 (t2/count :model/WorkspaceInput :workspace_id (:id workspace)))))
+          (testing "only grants access to newly discovered inputs (PRODUCTS), not already-granted ones"
+            (is (= 1 (count @grant-calls)))
+            ;; ORDERS was already granted in Transform A, so only PRODUCTS is in this grant call
+            (is (not (contains? (first @grant-calls) (mt/format-name :orders))))
+            (is (contains? (first @grant-calls) (mt/format-name :products)))
+            (is (not (contains? (first @grant-calls) "table_a")))))))))
+
+(deftest sync-transform-dependencies-idempotent-test
+  (testing "sync-transform-dependencies! is idempotent"
+    (let [mp        (mt/metadata-provider)
+          query     (lib/query mp (lib.metadata/table mp (mt/id :orders)))
+          workspace (ws.tu/create-provisional-ws! "Test Workspace")]
+      (mt/with-dynamic-fn-redefs [ws.isolation/grant-read-access-to-tables! (constantly nil)]
+        (let [wt (ws.common/add-to-changeset! (mt/user->id :crowberto) workspace
+                                              :transform nil
+                                              {:name         "Transform"
+                                               :source       {:type "query" :query query}
+                                               :target       {:database (mt/id)
+                                                              :schema   "analytics"
+                                                              :name     "output_table"}})]
+          ;; Call sync again to test idempotency
+          (ws.impl/sync-transform-dependencies! workspace wt)
+          (ws.impl/sync-transform-dependencies! workspace wt)
+          (testing "still has exactly one of each after multiple syncs"
+            (is (= 1 (t2/count :model/WorkspaceOutput :workspace_id (:id workspace))))
+            (is (= 1 (t2/count :model/WorkspaceInput :workspace_id (:id workspace))))
+            (is (= 1 (t2/count :model/WorkspaceDependency :workspace_id (:id workspace))))))))))

enterprise/backend/test/metabase_enterprise/workspaces/isolation_test.clj

@@ -0,0 +1,121 @@
+(ns ^:mb/driver-tests metabase-enterprise.workspaces.isolation-test
+  (:require
+   [clojure.java.jdbc :as jdbc]
+   [clojure.test :refer :all]
+   [metabase-enterprise.workspaces.common :as ws.common]
+   [metabase-enterprise.workspaces.isolation :as isolation]
+   [metabase-enterprise.workspaces.test-util :as ws.tu]
+   [metabase-enterprise.workspaces.util :as ws.u]
+   [metabase.driver :as driver]
+   [metabase.driver.sql-jdbc.connection :as sql-jdbc.conn]
+   [metabase.test :as mt]))
+
+(ws.tu/ws-fixtures!)
+
+(set! *warn-on-reflection* true)
+
+(def isolated-prefix @#'ws.u/isolated-prefix)
+
+;;; Test helper multimethod to verify cleanup
+
+(defmulti workspace-isolation-resources-exist?
+  "Check if isolation resources still exist for the workspace.
+  Returns a map with keys indicating which resources exist."
+  {:arglists '([database workspace])}
+  (fn [database _workspace]
+    (driver/the-driver (:engine database)))
+  :hierarchy #'driver/hierarchy)
+
+(defmethod workspace-isolation-resources-exist? :postgres
+  [database workspace]
+  (let [schema-name (ws.u/isolation-namespace-name workspace)
+        username    (ws.u/isolation-user-name workspace)
+        conn-spec   (sql-jdbc.conn/db->pooled-connection-spec (:id database))]
+    {:schema (-> (jdbc/query conn-spec
+                             ["SELECT 1 FROM information_schema.schemata WHERE schema_name = ?" schema-name])
+                 seq boolean)
+     :user   (-> (jdbc/query conn-spec
+                             ["SELECT 1 FROM pg_user WHERE usename = ?" username])
+                 seq boolean)}))
+
+(defmethod workspace-isolation-resources-exist? :h2
+  [database workspace]
+  (let [schema-name (ws.u/isolation-namespace-name workspace)
+        username    (ws.u/isolation-user-name workspace)
+        conn-spec   (sql-jdbc.conn/db->pooled-connection-spec (:id database))]
+    {:schema (-> (jdbc/query conn-spec
+                             ["SELECT 1 FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = ?" schema-name])
+                 seq boolean)
+     :user   (-> (jdbc/query conn-spec
+                             ["SELECT 1 FROM INFORMATION_SCHEMA.USERS WHERE NAME = ?" username])
+                 seq boolean)}))
+
+(defmethod workspace-isolation-resources-exist? :snowflake
+  [database workspace]
+  (let [schema-name (ws.u/isolation-namespace-name workspace)
+        db-name     (-> database :details :db)
+        role-name   (format "MB_ISOLATION_ROLE_%s" (:id workspace))
+        username    (ws.u/isolation-user-name workspace)
+        conn-spec   (sql-jdbc.conn/db->pooled-connection-spec (:id database))]
+    {:schema (-> (jdbc/query conn-spec
+                             [(format "SHOW SCHEMAS LIKE '%s' IN DATABASE \"%s\"" schema-name db-name)])
+                 seq boolean)
+     :user   (-> (jdbc/query conn-spec
+                             [(format "SHOW USERS LIKE '%s'" username)])
+                 seq boolean)
+     :role   (-> (jdbc/query conn-spec
+                             [(format "SHOW ROLES LIKE '%s'" role-name)])
+                 seq boolean)}))
+
+(defmethod workspace-isolation-resources-exist? :sqlserver
+  [database workspace]
+  (let [schema-name (ws.u/isolation-namespace-name workspace)
+        login-name  (format "%s_%s_login" isolated-prefix (:id workspace))
+        username    (ws.u/isolation-user-name workspace)
+        conn-spec   (sql-jdbc.conn/db->pooled-connection-spec (:id database))]
+    {:schema (-> (jdbc/query conn-spec
+                             ["SELECT 1 FROM sys.schemas WHERE name = ?" schema-name])
+                 seq boolean)
+     :user   (-> (jdbc/query conn-spec
+                             ["SELECT 1 FROM sys.database_principals WHERE name = ?" username])
+                 seq boolean)
+     :login  (-> (jdbc/query conn-spec
+                             ["SELECT 1 FROM master.sys.server_principals WHERE name = ?" login-name])
+                 seq boolean)}))
+
+(defmethod workspace-isolation-resources-exist? :clickhouse
+  [database workspace]
+  (let [db-name   (ws.u/isolation-namespace-name workspace)
+        username  (ws.u/isolation-user-name workspace)
+        conn-spec (sql-jdbc.conn/db->pooled-connection-spec (:id database))]
+    {:database (-> (jdbc/query conn-spec
+                               ["SELECT 1 FROM system.databases WHERE name = ?" db-name])
+                   seq boolean)
+     :user     (-> (jdbc/query conn-spec
+                               ["SELECT 1 FROM system.users WHERE name = ?" username])
+                   seq boolean)}))
+
+;;; Tests
+
+(deftest destroy-workspace-isolation-test
+  (mt/test-drivers (mt/normal-drivers-with-feature :workspace)
+    (ws.tu/with-workspaces! [workspace {:name "Test destroy isolation"}]
+      (ws.common/add-to-changeset! (mt/user->id :crowberto) workspace
+                                   :transform nil
+                                   {:name   "Transform A"
+                                    :source {:type "query" :query (mt/mbql-query orders {:limit 1})}
+                                    :target {:database (mt/id)
+                                             :schema   "analytics"
+                                             :name     "table_a"}})
+      (let [database (mt/db)]
+        (testing "resources are creeated during workspace initialization"
+          (let [resources (workspace-isolation-resources-exist? database workspace)]
+            (is (every? true? (vals resources)))))
+
+        (testing "destroy removes all isolation resources"
+          (isolation/destroy-workspace-isolation! database workspace)
+          (let [resources (workspace-isolation-resources-exist? database workspace)]
+            (is (every? false? (vals resources)))))
+
+        (testing "destroy is idempotent"
+          (isolation/destroy-workspace-isolation! database workspace))))))

enterprise/backend/test/metabase_enterprise/workspaces/test_util.clj

@@ -0,0 +1,141 @@
+(ns ^:mb/driver-tests metabase-enterprise.workspaces.test-util
+  (:require
+   [clojure.test :refer :all]
+   [metabase-enterprise.workspaces.common :as ws.common]
+   [metabase-enterprise.workspaces.isolation :as ws.isolation]
+   [metabase-enterprise.workspaces.models.workspace :as ws.model]
+   [metabase-enterprise.workspaces.util :as ws.u]
+   [metabase.config.core :as config]
+   [metabase.search.test-util :as search.tu]
+   [metabase.test :as mt]
+   [metabase.util :as u]
+   [metabase.util.log :as log]
+   [toucan2.core :as t2]))
+
+(defn ws-fixtures!
+  "Sets up test fixtures for workspace tests. Must be called at the top level of test namespaces."
+  []
+  (use-fixtures :once (fn [tests]
+                        ;; E.g. app-db.yml tests perorm driver tests. Workspaces are not supported on mysql.
+                        ;; Following disj suppresses those runs destined for failure.
+                        (mt/test-drivers (mt/normal-drivers-with-feature :workspace)
+                          (mt/with-premium-features [:workspaces :dependencies :transforms]
+                            (search.tu/with-index-disabled
+                              (tests))))))
+
+  (use-fixtures :each (fn [tests]
+                        (mt/with-model-cleanup [:model/Collection
+                                                :model/Transform
+                                                :model/TransformRun
+                                                :model/Workspace
+                                                :model/WorkspaceTransform
+                                                :model/WorkspaceInput
+                                                :model/WorkspaceOutput
+                                                :model/WorkspaceDependency]
+                          (tests)))))
+
+(derive :model/Workspace :model/WorkspaceCleanUpInTest)
+
+(t2/define-before-delete :model/WorkspaceCleanUpInTest
+  [workspace]
+  (try
+    (log/infof "Cleaningup workspace %d in tests" (:id workspace))
+    (when (:database_details workspace)
+      (ws.isolation/destroy-workspace-isolation! (t2/select-one :model/Database (:database_id workspace)) workspace))
+    (catch Exception e
+      (log/warn e "Failed to destroy isolation" {:workspace workspace})))
+  workspace)
+
+(defn ws-ready
+  "Poll until workspace status becomes :ready or timeout.
+   Note: uninitialized workspaces will never become ready without adding a transform."
+  [ws-or-id]
+  (let [ws-id (cond-> ws-or-id
+                (map? ws-or-id) :id)]
+    (or (u/poll {:thunk      #(t2/select-one :model/Workspace :id ws-id)
+                 :done?      #(not= :pending (:status %))
+                 ;; some cloud drivers are really slow
+                 :timeout-ms (if config/is-dev? 5000 60000)})
+        (throw (ex-info "Timeout waiting for workspace to be ready" {:workspace-id ws-id})))))
+
+(defn create-workspace-for-test!
+  "Create a workspace for testing using proper initialization.
+  Returns the workspace after waiting for it to be ready."
+  [props]
+  (let [creator-id (or (:creator_id props) (mt/user->id :crowberto))
+        props      (-> props
+                       (dissoc :creator_id)
+                       (update :database_id #(or % (mt/id))))]
+    (ws-ready (mt/with-current-user creator-id
+                (ws.common/create-workspace! creator-id props)))))
+
+(defn create-ready-ws!
+  "Create a workspace with full isolation and wait for it to be ready.
+   Use [[create-provisional-ws!]] for tests that don't need isolation."
+  [name]
+  (create-workspace-for-test! {:name name}))
+
+(defn create-provisional-ws!
+  "Create a workspace without database isolation for testing.
+   The workspace will have :ready status but no isolation resources.
+
+   Use this for tests that don't need actual database isolation, such as API
+   listing tests or tests that mock isolation functions.
+
+   For tests that need a :ready workspace with real isolation, use [[create-ready-ws!]]."
+  [name]
+  (let [creator-id (mt/user->id :crowberto)
+        db-id      (mt/id)]
+    (mt/with-current-user creator-id
+      (let [ws (ws.common/create-workspace! creator-id {:name         name
+                                                        :database_id  db-id
+                                                        :provisional? true})]
+        ;; Set schema and status to :ready so add-to-changeset! doesn't try to initialize
+        (t2/update! :model/Workspace (:id ws) {:schema (ws.u/isolation-namespace-name ws)
+                                               :status :ready})
+        (t2/select-one :model/Workspace :id (:id ws))))))
+
+(defn do-with-workspaces!
+  "Function that sets up workspaces for testing and cleans up afterwards.
+  Takes a sequence of props for workspace creation and a thunk that receives
+  the created workspaces as a vector. Each workspace is cleaned up by its own
+  stack frame, so cleanup naturally happens in reverse creation order."
+  [props-list thunk]
+  (if (empty? props-list)
+    (thunk [])
+    (let [ws (create-workspace-for-test! (first props-list))]
+      (try
+        (do-with-workspaces! (rest props-list)
+                             (fn [rest-workspaces]
+                               (thunk (into [ws] rest-workspaces))))
+        (finally
+          (when ws
+            (try
+              (ws.model/delete! (t2/select-one :model/Workspace :id (:id ws)))
+              (catch Exception _
+                ;; Workspace may already be deleted by the test
+                nil))))))))
+
+(defmacro with-workspaces!
+  "Execute body with properly initialized workspaces that are cleaned up afterward.
+
+  Creates each workspace using `ws.common/create-workspace!` and waits for it to
+  be ready. After body execution (or on error), cleans up using `ws.model/delete!`
+  which properly destroys database isolation resources.
+
+  Usage:
+    (with-workspaces [ws1 {:name \"Test WS 1\"}
+                      ws2 {:name \"Test WS 2\" :database_id (mt/id)}]
+      (testing \"workspace operations\"
+        (is (= :ready (:status ws1)))))"
+  [bindings & body]
+  (assert (vector? bindings) "bindings must be a vector")
+  (assert (even? (count bindings)) "bindings must have an even number of forms")
+  (let [pairs      (partition 2 bindings)
+        syms       (mapv first pairs)
+        props-list (mapv second pairs)]
+    `(do-with-workspaces!
+      [~@props-list]
+      (fn [[~@syms]]
+        ~@body))))
+

enterprise/backend/test/metabase_enterprise/workspaces/validation_test.clj

@@ -0,0 +1,178 @@
+(ns ^:mb/driver-tests metabase-enterprise.workspaces.validation-test
+  (:require
+   [clojure.test :refer :all]
+   [metabase-enterprise.workspaces.dag :as ws.dag]
+   [metabase-enterprise.workspaces.test-util :as ws.tu]
+   [metabase-enterprise.workspaces.validation :as ws.validation]
+   [metabase.test :as mt]
+   [toucan2.core :as t2]))
+
+(set! *warn-on-reflection* true)
+
+(ws.tu/ws-fixtures!)
+
+(defn- build-graph
+  "Build the workspace graph for validation tests."
+  [ws-id]
+  (let [changeset (t2/select-fn-vec (fn [{:keys [ref_id]}] {:entity-type :transform, :id ref_id})
+                                    [:model/WorkspaceTransform :ref_id] :workspace_id ws-id)]
+    (when (seq changeset)
+      (ws.dag/path-induced-subgraph ws-id changeset))))
+
+;;; ---------------------------------------- Basic API Tests ----------------------------------------
+
+(deftest find-downstream-problems-empty-workspace-test
+  (testing "find-downstream-problems returns empty for workspace with no transforms"
+    (let [workspace (ws.tu/create-provisional-ws! "Empty Workspace")]
+      (is (= [] (ws.validation/find-downstream-problems (:id workspace) nil))))))
+
+(deftest problems-endpoint-returns-empty-for-new-workspace-test
+  (testing "GET /api/ee/workspace/:id/problems returns empty list for workspace with no transforms"
+    (let [workspace (ws.tu/create-provisional-ws! "Test Workspace")
+          response  (mt/user-http-request :crowberto :get 200
+                                          (str "ee/workspace/" (:id workspace) "/problem"))]
+      (is (= [] response)))))
+
+(deftest problems-endpoint-requires-superuser-test
+  (testing "GET /api/ee/workspace/:id/problems requires superuser"
+    (let [workspace (ws.tu/create-provisional-ws! "Private Workspace")]
+      (is (= "You don't have permissions to do that."
+             (mt/user-http-request :rasta :get 403
+                                   (str "ee/workspace/" (:id workspace) "/problem")))))))
+
+(deftest problems-endpoint-404-for-nonexistent-workspace-test
+  (testing "GET /api/ee/workspace/:id/problems returns 404 for non-existent workspace"
+    (is (= "Not found."
+           (mt/user-http-request :crowberto :get 404 "ee/workspace/999999/problem")))))
+
+;;; ---------------------------------------- Problem Detection Tests ----------------------------------------
+
+(deftest unused-output-not-yet-created-test
+  (testing "detects when a workspace output table hasn't been created yet (no external dependents)"
+    (ws.tu/with-workspaces! [workspace {:name "Test Workspace"}]
+      (let [ws-id    (:id workspace)
+            ;; Create a workspace transform
+            {ref-id :ref_id} (mt/user-http-request :crowberto :post 200
+                                                   (str "ee/workspace/" ws-id "/transform")
+                                                   {:name   "Test Transform"
+                                                    :source {:type  "query"
+                                                             :query {:database (mt/id)
+                                                                     :type     :native
+                                                                     :native   {:query "SELECT 1 as col"}}}
+                                                    :target {:type   "table"
+                                                             :schema "public"
+                                                             :name   "test_output_table"}})
+            ;; The transform hasn't been run, so isolated_table_id is nil
+            ;; No external transforms depend on it
+            graph    (build-graph ws-id)
+            problems (ws.validation/find-downstream-problems ws-id graph)]
+        (is (= [{:category    :unused
+                 :problem     :not-run
+                 :severity    :info
+                 :block_merge false
+                 :description "Output hasn't been created yet, but nothing depends on it"
+                 :data        {:output    {:db_id (mt/id), :schema "public", :table "test_output_table"}
+                               :transform {:type :workspace-transform, :id ref-id}}}]
+               problems))))))
+
+(deftest dependent-transform-output-not-yet-created-test
+  (testing "detects when output table hasn't been created but external transforms depend on it"
+    (ws.tu/with-workspaces! [workspace {:name "Test Workspace"}]
+      (let [ws-id (:id workspace)]
+        ;; First, create the global output table that we'll have a dependency on
+        (mt/with-temp [:model/Table output-table {:db_id  (mt/id)
+                                                  :schema "public"
+                                                  :name   "global_output_table"
+                                                  :active true}]
+          ;; Create an external transform that depends on this table
+          ;; Note: The dependency will be created automatically by the Transform model hooks
+          (mt/with-temp [:model/Transform external-tx {:name   "External Transform"
+                                                       :source {:type  :query
+                                                                :query {:database (mt/id)
+                                                                        :type     :query
+                                                                        :query    {:source-table (:id output-table)}}}
+                                                       :target {:type     "table"
+                                                                :database (mt/id)
+                                                                :schema   "public"
+                                                                :name     "external_output"}}]
+            ;; Create a workspace transform that targets the same table
+            (let [{ref-id :ref_id} (mt/user-http-request :crowberto :post 200
+                                                         (str "ee/workspace/" ws-id "/transform")
+                                                         {:name   "Workspace Transform"
+                                                          :source {:type  "query"
+                                                                   :query {:database (mt/id)
+                                                                           :type     :native
+                                                                           :native   {:query "SELECT 1 as col"}}}
+                                                          :target {:type   "table"
+                                                                   :schema "public"
+                                                                   :name   "global_output_table"}})]
+              ;; Manually update the WorkspaceOutput to point to the global table
+              ;; (simulating a checked-out transform scenario)
+              (t2/update! :model/WorkspaceOutput
+                          {:workspace_id ws-id :ref_id ref-id}
+                          {:global_table_id (:id output-table)})
+
+              (is (= [{:category    :external-downstream
+                       :problem     :not-run
+                       :severity    :warning
+                       :block_merge true
+                       :description "Output hasn't been created yet, external transforms depend on it"
+                       :data        {:output    {:db_id (mt/id), :schema "public", :table "global_output_table"}
+                                     :transform {:type :workspace-transform, :id ref-id}
+                                     :dependents [{:type :external-transform
+                                                   :id   (:id external-tx)
+                                                   :name "External Transform"}]}}]
+                     (ws.validation/find-downstream-problems ws-id (build-graph ws-id)))))))))))
+
+(deftest no-problems-when-output-exists-and-no-field-changes-test
+  (testing "no problems when isolated table exists and has all required fields"
+    (ws.tu/with-workspaces! [workspace {:name "Test Workspace"}]
+      (let [ws-id (:id workspace)]
+        ;; Create both global and isolated tables with matching fields
+        (mt/with-temp [:model/Table global-table {:db_id  (mt/id)
+                                                  :schema "public"
+                                                  :name   "output_table"
+                                                  :active true}
+                       :model/Field _ {:table_id      (:id global-table)
+                                       :name          "col1"
+                                       :database_type "TEXT"
+                                       :base_type     :type/Text
+                                       :active        true}
+                       :model/Table isolated-table {:db_id  (mt/id)
+                                                    :schema "mb__isolation_test"
+                                                    :name   "public__output_table"
+                                                    :active true}
+                       :model/Field _ {:table_id      (:id isolated-table)
+                                       :name          "col1"
+                                       :database_type "TEXT"
+                                       :base_type     :type/Text
+                                       :active        true}]
+          ;; External transform that uses col1 via MBQL source-table
+          (mt/with-temp [:model/Transform _external-tx {:name   "External Transform"
+                                                        :source {:type  :query
+                                                                 :query {:database (mt/id)
+                                                                         :type     :query
+                                                                         :query    {:source-table (:id global-table)}}}
+                                                        :target {:type     "table"
+                                                                 :database (mt/id)
+                                                                 :schema   "public"
+                                                                 :name     "external_output"}}]
+            ;; Create workspace transform and output
+            (let [{ref-id :ref_id} (mt/user-http-request :crowberto :post 200
+                                                         (str "ee/workspace/" ws-id "/transform")
+                                                         {:name   "Workspace Transform"
+                                                          :source {:type  "query"
+                                                                   :query {:database (mt/id)
+                                                                           :type     :native
+                                                                           :native   {:query "SELECT 'test' as col1"}}}
+                                                          :target {:type   "table"
+                                                                   :schema "public"
+                                                                   :name   "output_table"}})]
+              ;; Update WorkspaceOutput to have both global and isolated table IDs
+              (t2/update! :model/WorkspaceOutput
+                          {:workspace_id ws-id :ref_id ref-id}
+                          {:global_table_id   (:id global-table)
+                           :isolated_table_id (:id isolated-table)})
+
+              ;; Should have no problems since isolated table has all required fields
+              (is (empty? (ws.validation/find-downstream-problems ws-id (build-graph ws-id)))))))))))

enterprise/frontend/src/metabase-enterprise/ai-sql-fixer/components/FixSqlQueryButton/FixSqlQueryButton.tsx

@@ -5,12 +5,27 @@ import { useMetabotAgent } from "metabase-enterprise/metabot/hooks";
 
 import { trackQueryFixClicked } from "../../analytics";
 
-export function FixSqlQueryButton() {
+type FixSqlQueryButtonProps = {
+  rawSql?: string | null;
+  errorMessage?: string | null;
+};
+
+export function FixSqlQueryButton({
+  rawSql,
+  errorMessage,
+}: FixSqlQueryButtonProps) {
   const { submitInput } = useMetabotAgent("omnibot");
 
   const handleClick = () => {
     trackQueryFixClicked();
-    submitInput("Fix this SQL query");
+    const promptParts = ["Fix this SQL query."];
+    if (errorMessage) {
+      promptParts.push(`The database returned this error: ${errorMessage}`);
+    }
+    if (rawSql) {
+      promptParts.push(`SQL:\n${rawSql}`);
+    }
+    submitInput(promptParts.join("\n\n"));
   };
 
   return <Button onClick={handleClick}>{t`Have Metabot fix it`}</Button>;

enterprise/frontend/src/metabase-enterprise/api/index.ts

@@ -20,3 +20,4 @@ export * from "./transform";
 export * from "./transform-job";
 export * from "./transform-tag";
 export * from "./upload-management";
+export * from "./workspace";

enterprise/frontend/src/metabase-enterprise/api/tags.ts

@@ -28,6 +28,8 @@ import type {
   TransformJob,
   TransformRun,
   TransformTag,
+  Workspace,
+  WorkspaceItem,
 } from "metabase-types/api";
 
 export const ENTERPRISE_TAG_TYPES = [
@@ -42,6 +44,10 @@ export const ENTERPRISE_TAG_TYPES = [
   "transform-job",
   "transform-job-via-tag",
   "transform-run",
+  "workspace-transforms",
+  "workspace-transform",
+  "workspace-tables",
+  "external-transforms",
   "git-tree",
   "git-file-content",
   "collection-dirty-entities",
@@ -49,6 +55,7 @@ export const ENTERPRISE_TAG_TYPES = [
   "remote-sync-branches",
   "remote-sync-current-task",
   "python-transform-library",
+  "workspace",
   "support-access-grant",
   "support-access-grant-current",
   "library-collection",
@@ -82,6 +89,24 @@ export function invalidateTags(
   return !error ? tags : [];
 }
 
+export function provideWorkspacesTags(
+  workspaces: Workspace[],
+): TagDescription<EnterpriseTagType>[] {
+  return [listTag("workspace"), ...workspaces.flatMap(provideWorkspaceTags)];
+}
+
+export function provideWorkspaceTags(
+  workspace: Workspace | WorkspaceItem,
+): TagDescription<EnterpriseTagType>[] {
+  return [idTag("workspace", workspace.id)];
+}
+
+export function provideWorkspaceContentItemsTags(
+  items: WorkspaceContentItem[],
+): TagDescription<EnterpriseTagType>[] {
+  return items.flatMap((transform) => idTag("transform", transform.id));
+}
+
 export function provideTransformTags(
   transform: Transform,
 ): TagDescription<EnterpriseTagType>[] {

enterprise/frontend/src/metabase-enterprise/api/transform.ts

@@ -151,7 +151,10 @@ export const transformApi = EnterpriseApi.injectEndpoints({
         body,
       }),
       invalidatesTags: (_, error) =>
-        invalidateTags(error, [listTag("transform")]),
+        invalidateTags(error, [
+          listTag("transform"),
+          listTag("external-transforms"),
+        ]),
     }),
     updateTransform: builder.mutation<Transform, UpdateTransformRequest>({
       query: ({ id, ...body }) => ({

enterprise/frontend/src/metabase-enterprise/api/workspace.ts

@@ -0,0 +1,405 @@
+import type {
+  CreateWorkspaceRequest,
+  CreateWorkspaceTransformRequest,
+  CreateWorkspaceTransformResponse,
+  ExternalTransformsRequest,
+  ExternalTransformsResponse,
+  TransformDownstreamMapping,
+  TransformId,
+  TransformUpstreamMapping,
+  UpdateWorkspaceTransformRequest,
+  ValidateTableNameRequest,
+  ValidateTableNameResponse,
+  Workspace,
+  WorkspaceAllowedDatabasesResponse,
+  WorkspaceCheckoutResponse,
+  WorkspaceGraphResponse,
+  WorkspaceId,
+  WorkspaceListResponse,
+  WorkspaceLogResponse,
+  WorkspaceMergeResponse,
+  WorkspaceProblem,
+  WorkspaceRunRequest,
+  WorkspaceRunResponse,
+  WorkspaceTablesResponse,
+  WorkspaceTransform,
+  WorkspaceTransformItem,
+  WorkspaceTransformMergeResponse,
+  WorkspaceTransformRef,
+  WorkspaceTransformRunResponse,
+  WorkspaceTransformsResponse,
+} from "metabase-types/api";
+
+import { EnterpriseApi } from "./api";
+import {
+  idTag,
+  invalidateTags,
+  listTag,
+  provideWorkspaceContentItemsTags,
+  provideWorkspaceTags,
+  provideWorkspacesTags,
+  tag,
+} from "./tags";
+
+export const workspaceApi = EnterpriseApi.injectEndpoints({
+  endpoints: (builder) => ({
+    getWorkspaces: builder.query<WorkspaceListResponse, void>({
+      query: () => ({
+        method: "GET",
+        url: "/api/ee/workspace",
+      }),
+      providesTags: (response) =>
+        response ? provideWorkspacesTags(response.items) : [],
+    }),
+    getWorkspace: builder.query<Workspace, WorkspaceId>({
+      query: (id) => ({
+        method: "GET",
+        url: `/api/ee/workspace/${id}`,
+      }),
+      providesTags: (workspace) =>
+        workspace ? provideWorkspaceTags(workspace) : [],
+    }),
+    createWorkspace: builder.mutation<Workspace, void>({
+      query: () => ({
+        method: "POST",
+        url: "/api/ee/workspace",
+      }),
+      invalidatesTags: (_, error) =>
+        invalidateTags(error, [listTag("workspace"), listTag("transform")]),
+    }),
+    updateWorkspace: builder.mutation<
+      Workspace,
+      { id: WorkspaceId; name?: string; database_id?: number }
+    >({
+      query: ({ id, ...body }) => ({
+        method: "PUT",
+        url: `/api/ee/workspace/${id}`,
+        body,
+      }),
+      invalidatesTags: (_, error, { id }) =>
+        invalidateTags(error, [idTag("workspace", id)]),
+    }),
+    createWorkspaceTransform: builder.mutation<
+      CreateWorkspaceTransformResponse,
+      { id: WorkspaceId } & CreateWorkspaceTransformRequest
+    >({
+      query: ({ id, ...body }) => ({
+        method: "POST",
+        url: `/api/ee/workspace/${id}/transform`,
+        body,
+      }),
+      invalidatesTags: (_, error, { id, global_id }) =>
+        invalidateTags(error, [
+          idTag("workspace", id),
+          idTag("workspace-transforms", id),
+          idTag("external-transforms", id),
+          idTag("workspace-tables", id),
+          listTag("transform"),
+          ...(global_id != null ? [idTag("transform", global_id)] : []),
+        ]),
+      transformResponse: (t: WorkspaceTransform) => ({ ...t, id: t.ref_id }),
+    }),
+    getTransformUpstreamMapping: builder.query<
+      TransformUpstreamMapping,
+      TransformId
+    >({
+      query: (id) => ({
+        method: "GET",
+        url: `/api/ee/workspace/mapping/transform/${id}/upstream`,
+      }),
+      providesTags: (mapping) =>
+        mapping?.transform
+          ? provideWorkspaceContentItemsTags([mapping.transform])
+          : [],
+    }),
+    getTransformDownstreamMapping: builder.query<
+      TransformDownstreamMapping,
+      TransformId
+    >({
+      query: (id) => ({
+        method: "GET",
+        url: `/api/ee/workspace/mapping/transform/${id}/downstream`,
+      }),
+      providesTags: (mapping) =>
+        mapping ? provideWorkspaceContentItemsTags(mapping.transforms) : [],
+    }),
+    getWorkspaceCheckout: builder.query<WorkspaceCheckoutResponse, TransformId>(
+      {
+        query: (transformId) => ({
+          method: "GET",
+          url: `/api/ee/workspace/checkout`,
+          params: { "transform-id": transformId },
+        }),
+        providesTags: (_, __, transformId) => [idTag("transform", transformId)],
+      },
+    ),
+    mergeWorkspace: builder.mutation<
+      WorkspaceMergeResponse,
+      { id: WorkspaceId; commit_message: string }
+    >({
+      query: ({ id, commit_message }) => ({
+        method: "POST",
+        url: `/api/ee/workspace/${id}/merge`,
+        body: { commit_message },
+      }),
+      invalidatesTags: (_, error) =>
+        invalidateTags(error, [tag("workspace"), tag("transform")]),
+    }),
+    mergeWorkspaceTransform: builder.mutation<
+      WorkspaceTransformMergeResponse,
+      WorkspaceTransformRef
+    >({
+      query: ({ workspaceId, transformId }) => ({
+        method: "POST",
+        url: `/api/ee/workspace/${workspaceId}/transform/${transformId}/merge`,
+      }),
+      invalidatesTags: (_, error) =>
+        invalidateTags(error, [tag("workspace"), tag("transform")]),
+    }),
+    archiveWorkspace: builder.mutation<Workspace, WorkspaceId>({
+      query: (id) => ({
+        method: "POST",
+        url: `/api/ee/workspace/${id}/archive`,
+      }),
+      invalidatesTags: (_, error) =>
+        invalidateTags(error, [tag("workspace"), tag("transform")]),
+    }),
+    unarchiveWorkspace: builder.mutation<Workspace, WorkspaceId>({
+      query: (id) => ({
+        method: "POST",
+        url: `/api/ee/workspace/${id}/unarchive`,
+      }),
+      invalidatesTags: (_, error) =>
+        invalidateTags(error, [tag("workspace"), tag("transform")]),
+    }),
+    deleteWorkspace: builder.mutation<void, WorkspaceId>({
+      query: (id) => ({
+        method: "DELETE",
+        url: `/api/ee/workspace/${id}`,
+      }),
+      invalidatesTags: (_, error) =>
+        invalidateTags(error, [tag("workspace"), tag("transform")]),
+    }),
+    validateTableName: builder.mutation<
+      ValidateTableNameResponse,
+      ValidateTableNameRequest
+    >({
+      query: ({ id, ...body }) => ({
+        method: "POST",
+        url: `/api/ee/workspace/${id}/transform/validate/target`,
+        body,
+      }),
+    }),
+    getWorkspaceTables: builder.query<WorkspaceTablesResponse, WorkspaceId>({
+      query: (id) => ({
+        method: "GET",
+        url: `/api/ee/workspace/${id}/table`,
+      }),
+      providesTags: (_, __, id) => [idTag("workspace-tables", id)],
+    }),
+    getWorkspaceGraph: builder.query<WorkspaceGraphResponse, WorkspaceId>({
+      query: (id) => ({
+        method: "GET",
+        url: `/api/ee/workspace/${id}/graph`,
+      }),
+      providesTags: (_, __, id) => [idTag("workspace", id)],
+    }),
+    getWorkspaceProblems: builder.query<WorkspaceProblem[], WorkspaceId>({
+      query: (id) => ({
+        method: "GET",
+        url: `/api/ee/workspace/${id}/problem`,
+      }),
+      providesTags: (_, __, id) => [idTag("workspace", id)],
+    }),
+    getWorkspaceTransforms: builder.query<
+      WorkspaceTransformItem[],
+      WorkspaceId
+    >({
+      query: (id) => ({
+        method: "GET",
+        url: `/api/ee/workspace/${id}/transform`,
+      }),
+      providesTags: (_, __, id) => [idTag("workspace-transforms", id)],
+      transformResponse: (response: WorkspaceTransformsResponse) =>
+        response.transforms,
+    }),
+    getExternalTransforms: builder.query<
+      ExternalTransformsResponse["transforms"],
+      ExternalTransformsRequest
+    >({
+      query: ({ workspaceId, databaseId }) => ({
+        method: "GET",
+        url: `/api/ee/workspace/${workspaceId}/external/transform`,
+        params: { database_id: databaseId },
+      }),
+      providesTags: (_, __, { workspaceId: id }) => [
+        listTag("external-transforms"),
+        idTag("external-transforms", id),
+      ],
+      transformResponse: (response: ExternalTransformsResponse) =>
+        response.transforms,
+    }),
+    getWorkspaceTransform: builder.query<
+      WorkspaceTransform,
+      { workspaceId: WorkspaceId; transformId: string }
+    >({
+      query: ({ workspaceId, transformId }) => ({
+        method: "GET",
+        url: `/api/ee/workspace/${workspaceId}/transform/${transformId}`,
+      }),
+      providesTags: (_, __, { transformId }) => [
+        // idTag("workspace-transforms", workspaceId),
+        idTag("workspace-transform", transformId),
+      ],
+      transformResponse: (response: WorkspaceTransform) => ({
+        ...response,
+        id: response.ref_id,
+      }),
+    }),
+    getWorkspaceLog: builder.query<WorkspaceLogResponse, WorkspaceId>({
+      query: (id) => ({
+        method: "GET",
+        url: `/api/ee/workspace/${id}/log`,
+      }),
+      providesTags: (_, _error, id) => [idTag("workspace", id)],
+    }),
+    runWorkspace: builder.mutation<WorkspaceRunResponse, WorkspaceRunRequest>({
+      query: ({ id, stale_only }) => ({
+        method: "POST",
+        url: `/api/ee/workspace/${id}/run`,
+        params: stale_only ? { stale_only: 1 } : undefined,
+      }),
+      invalidatesTags: (_, error, { id }) =>
+        invalidateTags(error, [
+          idTag("workspace", id),
+          idTag("workspace-transforms", id),
+          idTag("workspace-tables", id),
+          tag("workspace-transform"),
+          tag("transform"),
+        ]),
+    }),
+    runWorkspaceTransform: builder.mutation<
+      WorkspaceTransformRunResponse,
+      WorkspaceTransformRef
+    >({
+      query: ({ workspaceId, transformId }) => ({
+        method: "POST",
+        url: `/api/ee/workspace/${workspaceId}/transform/${transformId}/run`,
+      }),
+      invalidatesTags: (_, error, { workspaceId, transformId }) =>
+        invalidateTags(error, [
+          idTag("workspace", workspaceId),
+          idTag("workspace-transforms", workspaceId),
+          idTag("workspace-transform", transformId),
+          idTag("workspace-tables", workspaceId),
+        ]),
+    }),
+    updateWorkspaceTransform: builder.mutation<
+      WorkspaceTransform,
+      UpdateWorkspaceTransformRequest
+    >({
+      query: ({ workspaceId, transformId, ...body }) => ({
+        method: "PUT",
+        url: `/api/ee/workspace/${workspaceId}/transform/${transformId}`,
+        body,
+      }),
+      invalidatesTags: (_, error, { workspaceId, transformId }) =>
+        invalidateTags(error, [
+          idTag("workspace", workspaceId),
+          idTag("workspace-transforms", workspaceId),
+          idTag("workspace-transform", transformId),
+        ]),
+      transformResponse: (t: WorkspaceTransform) => ({ ...t, id: t.ref_id }),
+    }),
+    archiveWorkspaceTransform: builder.mutation<void, WorkspaceTransformRef>({
+      query: ({ workspaceId, transformId }) => ({
+        method: "POST",
+        url: `/api/ee/workspace/${workspaceId}/transform/${transformId}/archive`,
+      }),
+      invalidatesTags: (_, error, { workspaceId, transformId }) =>
+        invalidateTags(error, [
+          idTag("workspace", workspaceId),
+          idTag("workspace-transforms", workspaceId),
+          idTag("workspace-transform", transformId),
+          idTag("workspace-tables", workspaceId),
+          tag("transform"),
+        ]),
+    }),
+    unarchiveWorkspaceTransform: builder.mutation<void, WorkspaceTransformRef>({
+      query: ({ workspaceId, transformId }) => ({
+        method: "POST",
+        url: `/api/ee/workspace/${workspaceId}/transform/${transformId}/unarchive`,
+      }),
+      invalidatesTags: (_, error, { workspaceId, transformId }) =>
+        invalidateTags(error, [
+          idTag("workspace", workspaceId),
+          idTag("workspace-transforms", workspaceId),
+          idTag("workspace-transform", transformId),
+          idTag("workspace-tables", workspaceId),
+          tag("transform"),
+        ]),
+    }),
+    deleteWorkspaceTransform: builder.mutation<void, WorkspaceTransformRef>({
+      query: ({ workspaceId, transformId }) => ({
+        method: "DELETE",
+        url: `/api/ee/workspace/${workspaceId}/transform/${transformId}`,
+      }),
+      invalidatesTags: (_, error, { workspaceId, transformId }) =>
+        invalidateTags(error, [
+          idTag("workspace", workspaceId),
+          idTag("workspace-transforms", workspaceId),
+          idTag("external-transforms", workspaceId),
+          idTag("workspace-transform", transformId),
+          idTag("workspace-tables", workspaceId),
+          tag("transform"),
+        ]),
+    }),
+    getWorkspaceAllowedDatabases: builder.query<
+      WorkspaceAllowedDatabasesResponse,
+      void
+    >({
+      query: () => ({
+        method: "GET",
+        url: `/api/ee/workspace/database`,
+      }),
+    }),
+  }),
+});
+
+export const {
+  useGetWorkspacesQuery,
+  useGetWorkspaceQuery,
+  useGetWorkspaceTransformsQuery,
+  useGetExternalTransformsQuery,
+  useGetWorkspaceTransformQuery,
+  useLazyGetWorkspaceTransformQuery,
+  useCreateWorkspaceMutation,
+  useCreateWorkspaceTransformMutation,
+  useUpdateWorkspaceTransformMutation,
+  useArchiveWorkspaceTransformMutation,
+  useUnarchiveWorkspaceTransformMutation,
+  useDeleteWorkspaceTransformMutation,
+  useGetTransformUpstreamMappingQuery,
+  useGetTransformDownstreamMappingQuery,
+  useGetWorkspaceCheckoutQuery,
+  useMergeWorkspaceMutation,
+  useMergeWorkspaceTransformMutation,
+  useArchiveWorkspaceMutation,
+  useUnarchiveWorkspaceMutation,
+  useDeleteWorkspaceMutation,
+  useValidateTableNameMutation,
+  useUpdateWorkspaceMutation,
+  useGetWorkspaceTablesQuery,
+  useGetWorkspaceGraphQuery,
+  useGetWorkspaceProblemsQuery,
+  useGetWorkspaceLogQuery,
+  useRunWorkspaceMutation,
+  useRunWorkspaceTransformMutation,
+  useGetWorkspaceAllowedDatabasesQuery,
+} = workspaceApi;
+
+export const DEFAULT_WORKSPACE_TABLES_QUERY_RESPONSE: WorkspaceTablesResponse =
+  {
+    inputs: [],
+    outputs: [],
+  };

enterprise/frontend/src/metabase-enterprise/data-studio/app/pages/DataStudioLayout/DataStudioLayout.module.css

@@ -33,6 +33,7 @@
 .toggle {
   position: relative;
   color: var(--mb-color-text-primary);
+  font-weight: 600;
 
   &:hover,
   &.selected {
@@ -44,14 +45,103 @@
   }
 }
 
-.hoverButton {
-  &:hover {
-    .showOnHover {
-      opacity: 1;
-    }
+.workspacesSection {
+  border-top: 1px solid var(--mb-color-border);
+  padding-top: 0.75rem;
+}
 
-    .hideOnHover {
-      opacity: 0;
+.workspacesSectionHeader {
+  background-color: var(--mb-color-bg-secondary);
+  color: var(--mb-color-text-primary);
+  font-weight: 600;
+  transition: background-color 150ms ease;
+
+  &:hover {
+    background-color: var(--mb-color-brand-light);
+    color: var(--mb-color-brand);
+  }
+
+  &.selected {
+    background-color: var(--mb-color-brand-light);
+    color: var(--mb-color-brand);
+  }
+}
+
+.workspaceItem {
+  background-color: var(--mb-color-bg-white);
+  color: var(--mb-color-text-primary);
+  cursor: pointer;
+  border: 1px solid var(--mb-color-border);
+  transition:
+    background-color 150ms ease,
+    border-color 150ms ease,
+    color 150ms ease;
+
+  &:hover {
+    background-color: var(--mb-color-bg-light);
+    border-color: var(--mb-color-border-dark);
+  }
+
+  &:hover .workspaceMenuButton {
+    opacity: 1;
+  }
+
+  &.selected {
+    background-color: var(--mb-color-brand-lighter);
+    border-color: var(--mb-color-brand);
+    color: var(--mb-color-brand);
+  }
+
+  &.selected .workspaceMenuButton {
+    opacity: 1;
+  }
+
+  &:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+  }
+}
+
+.workspaceMenuButton {
+  color: var(--mb-color-text-secondary);
+  opacity: 0;
+  transition:
+    opacity 150ms ease,
+    background-color 150ms ease,
+    color 150ms ease;
+  flex-shrink: 0;
+
+  &:hover {
+    background-color: var(--mb-color-bg-medium);
+    color: var(--mb-color-text-primary);
+  }
+}
+
+.newWorkspaceButton {
+  background-color: transparent;
+  color: var(--mb-color-text-primary);
+  cursor: pointer;
+  border: none;
+  transition: color 150ms ease;
+
+  &:hover {
+    color: var(--mb-color-brand);
+  }
+
+  &:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+  }
+
+  .hoverButton {
+    &:hover {
+      .showOnHover {
+        opacity: 1;
+      }
+
+      .hideOnHover {
+        opacity: 0;
+      }
     }
   }
 }

enterprise/frontend/src/metabase-enterprise/data-studio/app/pages/DataStudioLayout/DataStudioLayout.tsx

@@ -28,6 +28,7 @@ import {
 } from "metabase/ui";
 
 import S from "./DataStudioLayout.module.css";
+import { WorkspacesSection } from "./WorkspaceSection";
 import { getCurrentTab } from "./utils";
 
 type DataStudioLayoutProps = {
@@ -87,7 +88,7 @@ function DataStudioNav({ isNavbarOpened, onNavbarToggle }: DataStudioNavProps) {
       justify="space-between"
       data-testid="data-studio-nav"
     >
-      <Stack gap="0.75rem">
+      <Stack gap="0.75rem" flex={1} mih={0}>
         <DataStudioNavbarToggle
           isNavbarOpened={isNavbarOpened}
           onNavbarToggle={onNavbarToggle}
@@ -144,6 +145,9 @@ function DataStudioNav({ isNavbarOpened, onNavbarToggle }: DataStudioNavProps) {
             showLabel={isNavbarOpened}
           />
         )}
+        {canAccessTransforms && (
+          <WorkspacesSection showLabel={isNavbarOpened} />
+        )}
       </Stack>
       <Stack gap="0.75rem">
         {canAccessTransforms && (
@@ -164,6 +168,7 @@ function DataStudioNav({ isNavbarOpened, onNavbarToggle }: DataStudioNavProps) {
             showLabel={isNavbarOpened}
           />
         )}
+
         <DataStudioTab
           label={t`Exit`}
           icon="exit"

enterprise/frontend/src/metabase-enterprise/data-studio/app/pages/DataStudioLayout/WorkspaceSection.tsx

@@ -0,0 +1,382 @@
+import { useDisclosure } from "@mantine/hooks";
+import { h } from "@tiptap/core";
+import cx from "classnames";
+import dayjs from "dayjs";
+import { useCallback, useMemo, useState } from "react";
+import { push } from "react-router-redux";
+import { t } from "ttag";
+
+import { ConfirmModal } from "metabase/common/components/ConfirmModal/ConfirmModal";
+import { ForwardRefLink } from "metabase/common/components/Link";
+import { useDispatch, useSelector } from "metabase/lib/redux";
+import * as Urls from "metabase/lib/urls";
+import { useMetadataToasts } from "metabase/metadata/hooks";
+import { getLocation } from "metabase/selectors/routing";
+import {
+  ActionIcon,
+  FixedSizeIcon,
+  Flex,
+  Group,
+  Icon,
+  type IconName,
+  Loader,
+  Menu,
+  Skeleton,
+  Stack,
+  Text,
+  Tooltip,
+  UnstyledButton,
+} from "metabase/ui";
+import {
+  useArchiveWorkspaceMutation,
+  useCreateWorkspaceMutation,
+  useDeleteWorkspaceMutation,
+  useGetWorkspacesQuery,
+  useUnarchiveWorkspaceMutation,
+} from "metabase-enterprise/api/workspace";
+import { TOOLTIP_OPEN_DELAY } from "metabase-enterprise/dependencies/components/DependencyGraph/constants";
+import type { Workspace, WorkspaceId } from "metabase-types/api/workspace";
+
+import S from "./DataStudioLayout.module.css";
+
+type WorkspacesSectionProps = {
+  showLabel: boolean;
+};
+
+function WorkspacesSection({ showLabel }: WorkspacesSectionProps) {
+  const dispatch = useDispatch();
+  const [isWorkspacesExpanded, setIsWorkspacesExpanded] = useState(true);
+  const { pathname } = useSelector(getLocation);
+  const { data: workspacesData, isLoading: areWorkspacesLoading } =
+    useGetWorkspacesQuery();
+  const [createWorkspace, { isLoading: isCreatingWorkspace }] =
+    useCreateWorkspaceMutation();
+
+  const workspaces = useMemo(
+    () =>
+      [...(workspacesData?.items ?? [])].sort((a, b) => {
+        // Archived workspaces should be placed at the end
+        if (a.archived !== b.archived) {
+          return a.archived ? 1 : -1;
+        }
+
+        // Within each group (archived/unarchived), sort by updated_at descending
+        const aDate = a.updated_at ? new Date(a.updated_at).getTime() : 0;
+        const bDate = b.updated_at ? new Date(b.updated_at).getTime() : 0;
+        return bDate - aDate;
+      }),
+    [workspacesData],
+  );
+
+  const handleOpenWorkspace = useCallback(
+    (workspaceId: number) => {
+      dispatch(push(Urls.dataStudioWorkspace(workspaceId)));
+    },
+    [dispatch],
+  );
+
+  const { sendErrorToast, sendSuccessToast } = useMetadataToasts();
+
+  const handleCreateWorkspace = useCallback(async () => {
+    try {
+      const workspace = await createWorkspace().unwrap();
+      handleOpenWorkspace(workspace.id);
+    } catch (error) {
+      sendErrorToast(t`Failed to create workspace`);
+    }
+  }, [createWorkspace, handleOpenWorkspace, sendErrorToast]);
+
+  const [archiveWorkspace] = useArchiveWorkspaceMutation();
+  const [unarchiveWorkspace] = useUnarchiveWorkspaceMutation();
+  const [deleteWorkspace] = useDeleteWorkspaceMutation();
+
+  const handleWorkspaceArchive = async (id: WorkspaceId) => {
+    try {
+      await archiveWorkspace(id).unwrap();
+      sendSuccessToast(t`Workspace archived successfully`);
+      dispatch(push(Urls.dataStudioWorkspaceList()));
+    } catch (error) {
+      sendErrorToast(t`Failed to archive workspace`);
+    }
+  };
+
+  const handleWorkspaceUnarchive = async (id: WorkspaceId) => {
+    try {
+      await unarchiveWorkspace(id).unwrap();
+      sendSuccessToast(t`Workspace restored successfully`);
+    } catch (error) {
+      sendErrorToast(t`Failed to restore workspace`);
+    }
+  };
+
+  const handleWorkspaceDelete = async (id: WorkspaceId) => {
+    try {
+      await deleteWorkspace(id).unwrap();
+      sendSuccessToast(t`Workspace deleted successfully`);
+      dispatch(push(Urls.dataStudioWorkspaceList()));
+    } catch (error) {
+      sendErrorToast(t`Failed to delete workspace`);
+    }
+  };
+
+  const isWorkspaceListPage = pathname === Urls.dataStudioWorkspaceList();
+
+  if (!showLabel) {
+    // In collapsed mode, show only an icon button with tooltip
+    return (
+      <Tooltip
+        label={t`Workspaces`}
+        position="right"
+        openDelay={TOOLTIP_OPEN_DELAY}
+      >
+        <UnstyledButton
+          className={cx(S.tab, { [S.selected]: isWorkspaceListPage })}
+          component={ForwardRefLink}
+          to={Urls.dataStudioWorkspaceList()}
+          p="0.75rem"
+          bdrs="md"
+        >
+          <Flex align="center" justify="center">
+            <FixedSizeIcon name="git_branch" display="block" />
+          </Flex>
+        </UnstyledButton>
+      </Tooltip>
+    );
+  }
+
+  return (
+    <Stack
+      data-testid="workspaces-section"
+      gap="0.5rem"
+      className={S.workspacesSection}
+      flex={1}
+      mih={0}
+    >
+      <UnstyledButton
+        className={cx(S.workspacesSectionHeader, {
+          [S.selected]: isWorkspaceListPage,
+        })}
+        onClick={() => setIsWorkspacesExpanded(!isWorkspacesExpanded)}
+        p="0.75rem"
+        bdrs="md"
+      >
+        <Flex align="center" justify="space-between" w="100%">
+          <Text size="sm" fw={600}>
+            {t`Workspaces`}
+          </Text>
+          <Icon
+            name={isWorkspacesExpanded ? "chevrondown" : "chevronright"}
+            size={16}
+          />
+        </Flex>
+      </UnstyledButton>
+
+      {isWorkspacesExpanded && (
+        <>
+          <UnstyledButton
+            className={S.newWorkspaceButton}
+            onClick={handleCreateWorkspace}
+            disabled={isCreatingWorkspace || areWorkspacesLoading}
+            p="0.5rem"
+            bdrs="md"
+          >
+            <Flex align="center" gap="xs">
+              {isCreatingWorkspace ? (
+                <Loader size="xs" />
+              ) : (
+                <Icon name="add" size={16} />
+              )}
+              <Text size="sm" fw={500}>
+                {t`New workspace`}
+              </Text>
+            </Flex>
+          </UnstyledButton>
+          <Stack
+            gap="0.75rem"
+            style={{ flex: 1, overflowY: "auto", minHeight: 0 }}
+          >
+            {areWorkspacesLoading ? (
+              <>
+                <Skeleton height={80} radius="md" />
+                <Skeleton height={80} radius="md" />
+              </>
+            ) : workspaces.length === 0 ? (
+              <Text c="text-secondary" size="xs" px="0.5rem">
+                {t`No workspaces yet`}
+              </Text>
+            ) : (
+              workspaces.map((workspace) => {
+                const isSelected =
+                  pathname === Urls.dataStudioWorkspace(workspace.id);
+
+                return (
+                  <WorkspaceItem
+                    key={workspace.id}
+                    workspace={workspace}
+                    isSelected={isSelected}
+                    onOpen={handleOpenWorkspace}
+                    onArchive={handleWorkspaceArchive}
+                    onUnarchive={handleWorkspaceUnarchive}
+                    onDelete={handleWorkspaceDelete}
+                  />
+                );
+              })
+            )}
+          </Stack>
+        </>
+      )}
+    </Stack>
+  );
+}
+
+export { WorkspacesSection };
+
+interface WorkspaceItemProps {
+  workspace: Workspace;
+  isSelected: boolean;
+  onOpen: (workspaceId: WorkspaceId) => void;
+  onArchive: (workspaceId: WorkspaceId) => Promise<void>;
+  onUnarchive: (workspaceId: WorkspaceId) => Promise<void>;
+  onDelete: (workspaceId: WorkspaceId) => Promise<void>;
+}
+
+function WorkspaceItem({
+  workspace,
+  isSelected,
+  onOpen,
+  onArchive,
+  onUnarchive,
+  onDelete,
+}: WorkspaceItemProps) {
+  const [
+    deleteModalOpened,
+    { open: openDeleteModal, close: closeDeleteModal },
+  ] = useDisclosure();
+  const timeAgo = workspace.updated_at
+    ? dayjs(workspace.updated_at).fromNow()
+    : null;
+
+  const handleArchive = () => {
+    onArchive(workspace.id);
+  };
+
+  const handleUnarchive = () => {
+    onUnarchive(workspace.id);
+  };
+
+  const handleDelete = () => {
+    openDeleteModal();
+  };
+
+  const handleConfirmDelete = async () => {
+    await onDelete(workspace.id);
+    closeDeleteModal();
+  };
+
+  const status = getWorkspaceListStatus(workspace);
+
+  return (
+    <UnstyledButton
+      className={cx(S.workspaceItem, { [S.selected]: isSelected })}
+      onClick={() => onOpen(workspace.id)}
+      p="0.75rem"
+      bdrs="md"
+      name={workspace.name}
+    >
+      <Flex align="flex-start" justify="space-between" gap="xs">
+        <Stack gap="xs" style={{ flex: 1, minWidth: 0 }}>
+          <Text size="sm" fw={600} truncate>
+            {workspace.name}
+          </Text>
+          {status && (
+            <Group
+              gap="xs"
+              align="center"
+              wrap="nowrap"
+              data-testid="workspace-status"
+            >
+              <Icon name={status.icon} size={10} c={status.color} />
+              <Text size="xs" fw={500} c={status.color}>
+                {status.label}
+              </Text>
+            </Group>
+          )}
+          {timeAgo && (
+            <Text size="xs" c="text-secondary" truncate>
+              {t`Updated ${timeAgo}`}
+            </Text>
+          )}
+        </Stack>
+        <Menu position="right" withinPortal>
+          <Menu.Target>
+            <ActionIcon
+              className={S.workspaceMenuButton}
+              component="span"
+              aria-label={t`More actions`}
+              onClick={(e: React.MouseEvent) => e.stopPropagation()}
+              size="sm"
+              variant="subtle"
+            >
+              <Icon name="ellipsis" size={16} />
+            </ActionIcon>
+          </Menu.Target>
+          <Menu.Dropdown onClick={(e: React.MouseEvent) => e.stopPropagation()}>
+            {workspace.archived ? (
+              <>
+                <Menu.Item
+                  leftSection={<Icon name="revert" />}
+                  onClick={handleUnarchive}
+                >
+                  {t`Restore`}
+                </Menu.Item>
+                <Menu.Divider />
+                <Menu.Item
+                  c="error"
+                  leftSection={<Icon name="trash" />}
+                  onClick={handleDelete}
+                  color="danger"
+                >
+                  {t`Delete`}
+                </Menu.Item>
+              </>
+            ) : (
+              <Menu.Item
+                leftSection={<Icon name="archive" />}
+                onClick={handleArchive}
+              >
+                {t`Archive`}
+              </Menu.Item>
+            )}
+          </Menu.Dropdown>
+        </Menu>
+      </Flex>
+
+      <ConfirmModal
+        confirmButtonText={t`Delete`}
+        message={t`This can't be undone.`}
+        opened={deleteModalOpened}
+        title={t`Delete ${workspace.name}?`}
+        onClose={closeDeleteModal}
+        onConfirm={handleConfirmDelete}
+      />
+    </UnstyledButton>
+  );
+}
+
+type WorkspaceListStatus = {
+  label: string;
+  icon: IconName;
+  color: string;
+};
+
+function getWorkspaceListStatus(workspace: Workspace): WorkspaceListStatus {
+  if (workspace.archived) {
+    return { label: t`Archived`, icon: "archive", color: "text-light" };
+  }
+
+  if (workspace.status === "pending") {
+    return { label: t`Pending setup`, icon: "clock", color: "warning" };
+  }
+
+  return { label: t`Ready`, icon: "check", color: "success" };
+}

enterprise/frontend/src/metabase-enterprise/data-studio/app/pages/WorkspacesSectionLayout/WorkspacesSectionLayout.tsx

@@ -0,0 +1,22 @@
+import { t } from "ttag";
+
+import { usePageTitle } from "metabase/hooks/use-page-title";
+
+import { SectionLayout } from "../../components/SectionLayout";
+
+type WorkspacesSectionLayoutProps = {
+  location: Location;
+  children?: React.ReactNode;
+};
+
+export function WorkspacesSectionLayout({
+  children,
+}: WorkspacesSectionLayoutProps) {
+  usePageTitle(t`Workspaces`);
+
+  return (
+    <SectionLayout>
+      {children}
+    </SectionLayout>
+  );
+}

enterprise/frontend/src/metabase-enterprise/data-studio/app/pages/WorkspacesSectionLayout/index.ts

@@ -0,0 +1 @@
+export * from "./WorkspacesSectionLayout";

enterprise/frontend/src/metabase-enterprise/data-studio/common/components/PaneHeader/PaneHeader.tsx

@@ -95,6 +95,7 @@ type PaneHeaderInputProps = {
   "data-testid"?: string;
   onChange?: (value: string) => void;
   onContentChange?: (value: string) => void;
+  disabled?: boolean;
 };
 
 export function PaneHeaderInput({
@@ -105,6 +106,7 @@ export function PaneHeaderInput({
   isOptional,
   onChange,
   onContentChange,
+  disabled,
 }: PaneHeaderInputProps) {
   return (
     <EditableText
@@ -118,6 +120,7 @@ export function PaneHeaderInput({
       px={isOptional ? "xs" : undefined}
       bd={isOptional ? "1px solid var(--mb-color-border)" : undefined}
       isOptional={isOptional}
+      isDisabled={disabled}
       data-testid={dataTestId}
       onChange={onChange}
       onContentChange={onContentChange}

enterprise/frontend/src/metabase-enterprise/data-studio/routes.tsx

@@ -15,11 +15,13 @@ import { DataStudioLayout } from "./app/pages/DataStudioLayout";
 import { DependenciesSectionLayout } from "./app/pages/DependenciesSectionLayout";
 import { LibrarySectionLayout } from "./app/pages/LibrarySectionLayout";
 import { TransformsSectionLayout } from "./app/pages/TransformsSectionLayout";
+import { WorkspacesSectionLayout } from "./app/pages/WorkspacesSectionLayout";
 import { getDataStudioMetadataRoutes } from "./data-model/routes";
 import { getDataStudioGlossaryRoutes } from "./glossary/routes";
 import { getDataStudioMetricRoutes } from "./metrics/routes";
 import { getDataStudioSnippetRoutes } from "./snippets/routes";
 import { getDataStudioTableRoutes } from "./tables/routes";
+import { getDataStudioWorkspaceRoutes } from "./workspaces/routes";
 
 export function getDataStudioRoutes(
   store: Store<State>,
@@ -54,6 +56,9 @@ export function getDataStudioRoutes(
           {getDataStudioMetricRoutes()}
           {getDataStudioSnippetRoutes()}
         </Route>
+        <Route path="workspaces" component={WorkspacesSectionLayout}>
+          {getDataStudioWorkspaceRoutes()}
+        </Route>
         {PLUGIN_DEPENDENCIES.isEnabled && (
           <Route path="dependencies" component={DependenciesSectionLayout}>
             {PLUGIN_DEPENDENCIES.getDataStudioDependencyRoutes()}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/components/MergeWorkspaceModal/MergeWorkspaceModal.module.css

@@ -0,0 +1,31 @@
+.sidebarItem {
+  cursor: pointer;
+  border-left: 2px solid transparent;
+
+  &:hover {
+    background: var(--mb-color-bg-light);
+  }
+}
+
+.sidebarItemActive {
+  background: var(--mb-color-bg-light);
+  border-left-color: var(--mb-color-brand);
+}
+
+.diffEditor {
+  height: 100%;
+
+  :global {
+    .cm-content {
+      padding: 0;
+    }
+
+    .cm-collapsedLines {
+      padding-left: 0;
+    }
+
+    .cm-scroller {
+      font-family: monospace;
+    }
+  }
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/components/MergeWorkspaceModal/MergeWorkspaceModal.tsx

@@ -0,0 +1,652 @@
+import { unifiedMergeView } from "@codemirror/merge";
+import cx from "classnames";
+import { diffLines } from "diff";
+import { useEffect, useMemo, useState } from "react";
+import { msgid, ngettext, t } from "ttag";
+import _ from "underscore";
+import * as Yup from "yup";
+
+import { CodeMirror } from "metabase/common/components/CodeMirror";
+import {
+  Form,
+  FormProvider,
+  FormSubmitButton,
+  FormTextarea,
+} from "metabase/forms";
+import { useSelector } from "metabase/lib/redux";
+import { useMetadataToasts } from "metabase/metadata/hooks";
+import EditorS from "metabase/query_builder/components/NativeQueryEditor/CodeMirrorEditor/CodeMirrorEditor.module.css";
+import { getMetadata } from "metabase/selectors/metadata";
+import {
+  Box,
+  Collapse,
+  Flex,
+  Group,
+  Icon,
+  Loader,
+  Modal,
+  Stack,
+  Text,
+  Title,
+} from "metabase/ui";
+import {
+  useGetWorkspaceProblemsQuery,
+  useLazyGetTransformQuery,
+  useLazyGetWorkspaceTransformQuery,
+} from "metabase-enterprise/api";
+import * as Lib from "metabase-lib";
+import type Metadata from "metabase-lib/v1/metadata/Metadata";
+import type {
+  TransformSource,
+  WorkspaceId,
+  WorkspaceTransformItem,
+} from "metabase-types/api";
+
+import S from "./MergeWorkspaceModal.module.css";
+import type { ProblemCheckCategory } from "./problemUtils";
+import {
+  formatProblemDetails,
+  getCheckName,
+  getCheckStatus,
+  getCheckStatusWithUnused,
+  groupProblemsByCategory,
+} from "./problemUtils";
+
+const MAX_COMMIT_MESSAGE_LENGTH = 255;
+
+type ReviewChangesModalProps = {
+  onClose: VoidFunction;
+  onSubmit: (commitMessage: string) => Promise<void>;
+  isLoading?: boolean;
+  workspaceId: WorkspaceId;
+  workspaceName: string;
+  workspaceTransforms: WorkspaceTransformItem[];
+};
+
+type MergeWorkspaceFormValues = {
+  commit_message: string;
+};
+
+const initialValues: MergeWorkspaceFormValues = {
+  commit_message: "",
+};
+
+const getMergeWorkspaceSchema = () =>
+  Yup.object().shape({
+    commit_message: Yup.string()
+      .trim()
+      .max(MAX_COMMIT_MESSAGE_LENGTH, t`Commit message is too long.`)
+      .required(t`Please provide a commit message.`),
+  });
+
+function getSourceCode(
+  transform: { source: TransformSource },
+  metadata: Metadata,
+): string {
+  if (transform.source.type === "python") {
+    return transform.source.body;
+  }
+  if (transform.source.type === "query") {
+    const metadataProvider = Lib.metadataProvider(
+      transform.source.query.database,
+      metadata,
+    );
+    const query = Lib.fromJsQuery(metadataProvider, transform.source.query);
+    if (Lib.queryDisplayInfo(query).isNative) {
+      return Lib.rawNativeQuery(query);
+    }
+  }
+  return "";
+}
+
+function computeDiffStats(
+  oldSource: string,
+  newSource: string,
+): { additions: number; deletions: number } {
+  const changes = diffLines(oldSource, newSource);
+  let additions = 0;
+  let deletions = 0;
+
+  for (const change of changes) {
+    const lineCount = change.count ?? 0;
+    if (change.added) {
+      additions += lineCount;
+    } else if (change.removed) {
+      deletions += lineCount;
+    }
+  }
+
+  return { additions, deletions };
+}
+
+const QualityChecksSection = ({
+  workspaceId,
+}: {
+  workspaceId: WorkspaceId;
+}) => {
+  const { data: problems = [], isLoading } =
+    useGetWorkspaceProblemsQuery(workspaceId);
+  const grouped = useMemo(() => groupProblemsByCategory(problems), [problems]);
+  const [expandedChecks, setExpandedChecks] = useState<
+    Set<ProblemCheckCategory>
+  >(new Set());
+
+  const checkCategories: ProblemCheckCategory[] = [
+    "external-dependencies",
+    "internal-dependencies",
+    "structural-issues",
+    "unused-outputs",
+  ];
+
+  const toggleCheck = (category: ProblemCheckCategory) => {
+    setExpandedChecks((prev) => {
+      const next = new Set(prev);
+      if (next.has(category)) {
+        next.delete(category);
+      } else {
+        next.add(category);
+      }
+      return next;
+    });
+  };
+
+  return (
+    <Stack gap="sm">
+      <Text fw="bold">{t`Quality Checks`}</Text>
+      <Stack gap="sm">
+        {checkCategories.map((category) => {
+          const categoryProblems = grouped[category];
+          const checkStatus =
+            category === "unused-outputs"
+              ? getCheckStatusWithUnused(categoryProblems)
+              : getCheckStatus(categoryProblems);
+          const isExpanded = expandedChecks.has(category);
+          const hasProblems = checkStatus.count > 0;
+
+          return (
+            <Box key={category}>
+              <Group
+                justify="space-between"
+                style={{ cursor: hasProblems ? "pointer" : "default" }}
+                onClick={() => hasProblems && toggleCheck(category)}
+              >
+                <Text>{getCheckName(category)}</Text>
+                {isLoading ? (
+                  <Loader size="xs" />
+                ) : (
+                  <Group gap="xs">
+                    {checkStatus.status === "passed" && (
+                      <Icon name="check" size={14} c="success" />
+                    )}
+                    <Text
+                      c={
+                        checkStatus.status === "passed"
+                          ? "success"
+                          : checkStatus.problems.some(
+                                (p) => p.severity === "error",
+                              )
+                            ? "error"
+                            : "warning"
+                      }
+                    >
+                      {checkStatus.status === "passed"
+                        ? category === "unused-outputs" && checkStatus.count > 0
+                          ? t`${checkStatus.count} info`
+                          : t`Passed`
+                        : checkStatus.count === 1
+                          ? t`Failed`
+                          : t`${checkStatus.count} issues`}
+                    </Text>
+                  </Group>
+                )}
+              </Group>
+              {hasProblems && (
+                <Collapse in={isExpanded}>
+                  <Stack gap="xs" mt="xs" pl="md">
+                    {checkStatus.problems.map((problem, idx) => (
+                      <Box key={idx}>
+                        <Text size="sm" c="text-medium">
+                          {formatProblemDetails(problem)}
+                        </Text>
+                      </Box>
+                    ))}
+                  </Stack>
+                </Collapse>
+              )}
+            </Box>
+          );
+        })}
+      </Stack>
+    </Stack>
+  );
+};
+
+const OverviewPanel = ({
+  commitMessageLength = 0,
+  hasCommitMessageError,
+  workspaceId,
+  transformCount,
+}: {
+  commitMessageLength?: number;
+  hasCommitMessageError: boolean;
+  workspaceId: WorkspaceId;
+  transformCount: number;
+}) => {
+  return (
+    <Box p="xl" h="100%" style={{ overflowY: "auto" }}>
+      <Stack>
+        <Box>
+          <Text>{t`This will merge all changes from this workspace back to the source transforms.`}</Text>
+          <Text mt="xs">
+            {t`The commit message will be used to display the history of transform changes.`}
+          </Text>
+        </Box>
+        <Stack mt="md" gap="xs">
+          <FormTextarea
+            data-autofocus
+            label={t`Commit message`}
+            name="commit_message"
+            placeholder={t`Describe the changes you made in this workspace...`}
+            minRows={4}
+            required
+          />
+          {!hasCommitMessageError && (
+            <Text size="xs" c="text-tertiary">
+              {commitMessageLength}/{MAX_COMMIT_MESSAGE_LENGTH}
+            </Text>
+          )}
+        </Stack>
+        <QualityChecksSection workspaceId={workspaceId} />
+        <Box
+          p="md"
+          style={{
+            backgroundColor: "var(--mb-color-bg-light)",
+            borderRadius: "var(--mb-radius-sm)",
+          }}
+        >
+          <Text>
+            {ngettext(
+              msgid`${transformCount} transform will be merged`,
+              `${transformCount} transforms will be merged`,
+              transformCount,
+            )}
+          </Text>
+        </Box>
+      </Stack>
+    </Box>
+  );
+};
+
+const DiffView = ({
+  transform,
+  workspaceId,
+}: {
+  transform: WorkspaceTransformItem;
+  workspaceId: WorkspaceId;
+}) => {
+  const metadata = useSelector(getMetadata);
+  const isNewTransform = transform.global_id == null;
+
+  const [fetchWorkspaceTransform, workspaceTransformResult] =
+    useLazyGetWorkspaceTransformQuery();
+  const [fetchGlobalTransform, globalTransformResult] =
+    useLazyGetTransformQuery();
+
+  useEffect(() => {
+    fetchWorkspaceTransform({
+      workspaceId,
+      transformId: transform.ref_id,
+    });
+    if (transform.global_id) {
+      fetchGlobalTransform(transform.global_id);
+    }
+  }, [
+    transform.global_id,
+    transform.ref_id,
+    workspaceId,
+    fetchWorkspaceTransform,
+    fetchGlobalTransform,
+  ]);
+
+  const isLoading =
+    workspaceTransformResult.isLoading ||
+    (!isNewTransform && globalTransformResult.isLoading);
+  const hasError =
+    workspaceTransformResult.error ||
+    (!isNewTransform && globalTransformResult.error);
+
+  const oldSource = globalTransformResult.data
+    ? getSourceCode(globalTransformResult.data, metadata)
+    : "";
+  const newSource = workspaceTransformResult.data
+    ? getSourceCode(workspaceTransformResult.data, metadata)
+    : "";
+
+  const extensions = useMemo(
+    () =>
+      _.compact([
+        oldSource &&
+          unifiedMergeView({
+            original: oldSource,
+            mergeControls: false,
+          }),
+      ]),
+    [oldSource],
+  );
+
+  if (isLoading) {
+    return (
+      <Flex
+        align="center"
+        justify="center"
+        h="100%"
+        direction="column"
+        gap="sm"
+      >
+        <Loader size="sm" />
+        <Text c="text-medium">{t`Loading diff...`}</Text>
+      </Flex>
+    );
+  }
+
+  if (hasError) {
+    return (
+      <Flex align="center" justify="center" h="100%">
+        <Text c="danger">{t`Failed to load diff`}</Text>
+      </Flex>
+    );
+  }
+
+  if (!newSource) {
+    return (
+      <Flex align="center" justify="center" h="100%">
+        <Text c="text-medium">{t`No source code to display`}</Text>
+      </Flex>
+    );
+  }
+
+  return (
+    <CodeMirror
+      className={cx(EditorS.editor, S.diffEditor)}
+      extensions={extensions}
+      value={newSource}
+      readOnly
+      autoCorrect="off"
+    />
+  );
+};
+
+const TransformListItem = ({
+  transform,
+  isSelected,
+  onClick,
+  workspaceId,
+}: {
+  transform: WorkspaceTransformItem;
+  isSelected: boolean;
+  onClick: () => void;
+  workspaceId: WorkspaceId;
+}) => {
+  const metadata = useSelector(getMetadata);
+  const isNewTransform = transform.global_id == null;
+  const [fetchWorkspaceTransform, workspaceTransformResult] =
+    useLazyGetWorkspaceTransformQuery();
+  const [fetchGlobalTransform, globalTransformResult] =
+    useLazyGetTransformQuery();
+
+  useEffect(() => {
+    fetchWorkspaceTransform({
+      workspaceId,
+      transformId: transform.ref_id,
+    });
+    if (transform.global_id) {
+      fetchGlobalTransform(transform.global_id);
+    }
+  }, [
+    transform.global_id,
+    transform.ref_id,
+    workspaceId,
+    fetchWorkspaceTransform,
+    fetchGlobalTransform,
+  ]);
+
+  const oldSource = globalTransformResult.data
+    ? getSourceCode(globalTransformResult.data, metadata)
+    : "";
+  const newSource = workspaceTransformResult.data
+    ? getSourceCode(workspaceTransformResult.data, metadata)
+    : "";
+
+  const stats = useMemo(() => {
+    if (isNewTransform && newSource) {
+      // For new transforms, count all lines as additions
+      const lineCount = newSource.split("\n").length;
+      return { additions: lineCount, deletions: 0 };
+    }
+    if (oldSource && newSource) {
+      return computeDiffStats(oldSource, newSource);
+    }
+    return null;
+  }, [isNewTransform, oldSource, newSource]);
+
+  return (
+    <Flex
+      align="center"
+      justify="space-between"
+      px="md"
+      py="sm"
+      className={cx(S.sidebarItem, isSelected && S.sidebarItemActive)}
+      onClick={onClick}
+    >
+      <Flex align="center" gap="sm" style={{ overflow: "hidden" }}>
+        <Icon name="code_block" size={14} c="text-medium" />
+        <Text truncate>{transform.name}</Text>
+      </Flex>
+      {stats && (stats.additions > 0 || stats.deletions > 0) && (
+        <Flex gap="xs" fz="xs" style={{ flexShrink: 0 }}>
+          {stats.additions > 0 && <Text c="success">+{stats.additions}</Text>}
+          {stats.deletions > 0 && <Text c="danger">-{stats.deletions}</Text>}
+        </Flex>
+      )}
+    </Flex>
+  );
+};
+
+export const ReviewChangesModal = ({
+  onClose,
+  onSubmit,
+  isLoading = false,
+  workspaceId,
+  workspaceName,
+  workspaceTransforms,
+}: ReviewChangesModalProps) => {
+  const { sendErrorToast } = useMetadataToasts();
+  const validationSchema = useMemo(() => getMergeWorkspaceSchema(), []);
+
+  const { data: workspaceProblems = [] } =
+    useGetWorkspaceProblemsQuery(workspaceId);
+  const hasBlockingProblems = useMemo(
+    () => workspaceProblems.some((p) => p.block_merge === true),
+    [workspaceProblems],
+  );
+
+  const updatedTransforms = useMemo(
+    () => workspaceTransforms.filter((t) => t.global_id != null),
+    [workspaceTransforms],
+  );
+
+  const newTransforms = useMemo(
+    () => workspaceTransforms.filter((t) => t.global_id == null),
+    [workspaceTransforms],
+  );
+
+  const [selectedTransformId, setSelectedTransformId] = useState<
+    string | "overview"
+  >("overview");
+
+  const selectedTransform =
+    selectedTransformId !== "overview"
+      ? workspaceTransforms.find((t) => t.ref_id === selectedTransformId)
+      : null;
+
+  const handleSubmit = async (values: MergeWorkspaceFormValues) => {
+    try {
+      await onSubmit(values.commit_message.trim());
+      onClose();
+    } catch (error) {
+      sendErrorToast(t`Failed to merge workspace`);
+      throw error;
+    }
+  };
+
+  return (
+    <Modal
+      data-testid="review-changes-modal"
+      onClose={onClose}
+      opened
+      title={
+        <Flex align="center" gap="sm">
+          <Icon name="git_branch" c="brand" />
+          <Flex direction="column" gap="xs">
+            <Title order={3}>{t`Review Changes`}</Title>
+            <Text size="sm" c="text-medium">
+              {workspaceName}
+            </Text>
+          </Flex>
+        </Flex>
+      }
+      size="xl"
+      padding={0}
+      styles={{
+        header: {
+          padding: "1.25rem 1.5rem",
+          borderBottom: "1px solid var(--mb-color-border)",
+        },
+      }}
+    >
+      <FormProvider
+        initialValues={initialValues}
+        validationSchema={validationSchema}
+        onSubmit={handleSubmit}
+      >
+        {({ values, touched, errors }) => (
+          <Form style={{ display: "flex", flexDirection: "column" }}>
+            <Flex h={500}>
+              <Box
+                pt="md"
+                w={220}
+                miw={220}
+                style={{
+                  borderRight: "1px solid var(--mb-color-border)",
+                  overflowY: "auto",
+                }}
+              >
+                <Flex
+                  align="center"
+                  gap="sm"
+                  px="md"
+                  py="sm"
+                  className={cx(
+                    S.sidebarItem,
+                    selectedTransformId === "overview" && S.sidebarItemActive,
+                  )}
+                  onClick={() => setSelectedTransformId("overview")}
+                >
+                  <Icon name="document" size={14} c="text-medium" />
+                  <Text>{t`Overview`}</Text>
+                </Flex>
+                {newTransforms.length > 0 && (
+                  <>
+                    <Text
+                      px="md"
+                      py="sm"
+                      fz="xs"
+                      fw={700}
+                      tt="uppercase"
+                      lts="0.5px"
+                      c="text-medium"
+                    >
+                      {t`New transforms`}
+                    </Text>
+                    {newTransforms.map((transform) => (
+                      <TransformListItem
+                        key={transform.ref_id}
+                        transform={transform}
+                        isSelected={selectedTransformId === transform.ref_id}
+                        onClick={() => setSelectedTransformId(transform.ref_id)}
+                        workspaceId={workspaceId}
+                      />
+                    ))}
+                  </>
+                )}
+                {updatedTransforms.length > 0 && (
+                  <>
+                    <Text
+                      px="md"
+                      py="sm"
+                      fz="xs"
+                      fw={700}
+                      tt="uppercase"
+                      lts="0.5px"
+                      c="text-medium"
+                    >
+                      {t`Modified transforms`}
+                    </Text>
+                    {updatedTransforms.map((transform) => (
+                      <TransformListItem
+                        key={transform.ref_id}
+                        transform={transform}
+                        isSelected={selectedTransformId === transform.ref_id}
+                        onClick={() => setSelectedTransformId(transform.ref_id)}
+                        workspaceId={workspaceId}
+                      />
+                    ))}
+                  </>
+                )}
+              </Box>
+              <Box flex={1} miw={0} style={{ overflow: "auto" }}>
+                {selectedTransformId === "overview" ? (
+                  <OverviewPanel
+                    commitMessageLength={values.commit_message?.length}
+                    hasCommitMessageError={!!errors.commit_message}
+                    workspaceId={workspaceId}
+                    transformCount={workspaceTransforms.length}
+                  />
+                ) : selectedTransform ? (
+                  <DiffView
+                    key={selectedTransform.ref_id}
+                    transform={selectedTransform}
+                    workspaceId={workspaceId}
+                  />
+                ) : (
+                  <Flex align="center" justify="center" h="100%">
+                    <Text c="text-medium">{t`Transform not found`}</Text>
+                  </Flex>
+                )}
+              </Box>
+            </Flex>
+            <Flex
+              justify="flex-end"
+              align="center"
+              p="md"
+              style={{ borderTop: "1px solid var(--mb-color-border)" }}
+            >
+              <FormSubmitButton
+                disabled={
+                  !values.commit_message?.trim() ||
+                  (touched.commit_message && !!errors.commit_message) ||
+                  hasBlockingProblems
+                }
+                label={t`Merge`}
+                loading={isLoading}
+                variant="filled"
+              />
+            </Flex>
+          </Form>
+        )}
+      </FormProvider>
+    </Modal>
+  );
+};
+
+export { ReviewChangesModal as MergeWorkspaceModal };

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/components/MergeWorkspaceModal/problemUtils.ts

@@ -0,0 +1,163 @@
+import type { WorkspaceProblem } from "metabase-types/api";
+
+export type ProblemCheckCategory =
+  | "external-dependencies"
+  | "internal-dependencies"
+  | "structural-issues"
+  | "unused-outputs";
+
+export type GroupedProblems = {
+  "external-dependencies": WorkspaceProblem[];
+  "internal-dependencies": WorkspaceProblem[];
+  "structural-issues": WorkspaceProblem[];
+  "unused-outputs": WorkspaceProblem[];
+};
+
+export type CheckStatus = {
+  status: "passed" | "failed";
+  count: number;
+  problems: WorkspaceProblem[];
+};
+
+/**
+ * Groups problems by category into logical Quality Check categories
+ */
+export function groupProblemsByCategory(
+  problems: WorkspaceProblem[],
+): GroupedProblems {
+  const grouped: GroupedProblems = {
+    "external-dependencies": [],
+    "internal-dependencies": [],
+    "structural-issues": [],
+    "unused-outputs": [],
+  };
+
+  for (const problem of problems) {
+    if (problem.category === "external-downstream") {
+      grouped["external-dependencies"].push(problem);
+    } else if (problem.category === "internal-downstream") {
+      grouped["internal-dependencies"].push(problem);
+    } else if (
+      problem.category === "internal" ||
+      problem.category === "external"
+    ) {
+      grouped["structural-issues"].push(problem);
+    } else if (problem.category === "unused") {
+      grouped["unused-outputs"].push(problem);
+    }
+  }
+
+  return grouped;
+}
+
+/**
+ * Calculates the status for a group of problems
+ * Unused problems are informational and don't affect status (always "passed")
+ */
+export function getCheckStatus(problems: WorkspaceProblem[]): CheckStatus {
+  // Filter out unused problems for status calculation - they're informational only
+  const relevantProblems = problems.filter((p) => p.category !== "unused");
+
+  // If all problems are unused, return passed with empty array
+  // If there are any non-unused problems, return failed with those problems
+  return {
+    status: relevantProblems.length === 0 ? "passed" : "failed",
+    count: relevantProblems.length,
+    problems: relevantProblems,
+  };
+}
+
+/**
+ * Calculates status including unused problems (for unused-outputs check)
+ */
+export function getCheckStatusWithUnused(
+  problems: WorkspaceProblem[],
+): CheckStatus {
+  return {
+    status: problems.length === 0 ? "passed" : "passed", // Unused is always passed (informational)
+    count: problems.length,
+    problems: problems, // Include all problems for display
+  };
+}
+
+/**
+ * Formats problem details for display
+ */
+export function formatProblemDetails(problem: WorkspaceProblem): string {
+  const parts: string[] = [];
+
+  // Add transform reference if available
+  if ("transform" in problem.data && problem.data.transform) {
+    const transform = problem.data.transform;
+    const transformName =
+      "name" in transform && transform.name
+        ? transform.name
+        : transform.id.toString();
+    const transformType =
+      transform.type === "workspace-transform" ? "workspace" : "external";
+    parts.push(`${transformType} transform "${transformName}"`);
+  }
+
+  // Add table reference if available
+  if ("output" in problem.data && problem.data.output) {
+    const output = problem.data.output;
+    if ("global" in output && output.global) {
+      const schema = output.global.schema || "";
+      const table = output.global.table || "";
+      if (schema && table) {
+        parts.push(`table "${schema}.${table}"`);
+      } else if (table) {
+        parts.push(`table "${table}"`);
+      }
+    }
+  }
+
+  // Add bad-refs for removed-field problems
+  if ("bad-refs" in problem.data && problem.data["bad-refs"]) {
+    const badRefs = problem.data["bad-refs"];
+    if (Array.isArray(badRefs) && badRefs.length > 0) {
+      const fieldNames = badRefs
+        .map((ref) => (ref.data?.name ? ref.data.name : null))
+        .filter(Boolean);
+      if (fieldNames.length > 0) {
+        parts.push(`removed fields: ${fieldNames.join(", ")}`);
+      }
+    }
+  }
+
+  // Add dependents if available
+  if ("dependents" in problem.data && problem.data.dependents) {
+    const dependents = problem.data.dependents;
+    if (Array.isArray(dependents) && dependents.length > 0) {
+      const dependentNames = dependents
+        .map((dep: { name?: string; id?: string | number }) =>
+          dep.name ? dep.name : dep.id?.toString(),
+        )
+        .filter(Boolean);
+      if (dependentNames.length > 0) {
+        parts.push(`affects: ${dependentNames.join(", ")}`);
+      }
+    }
+  }
+
+  // If we have the description and no specific details, use description
+  if (parts.length === 0 && problem.description) {
+    return problem.description;
+  }
+
+  return parts.length > 0
+    ? `${problem.description}. ${parts.join(". ")}`
+    : problem.description;
+}
+
+/**
+ * Gets user-friendly check name for a category
+ */
+export function getCheckName(category: ProblemCheckCategory): string {
+  return category
+    .split("-")
+    .map((word, index) =>
+      index === 0 ? word.charAt(0).toUpperCase() + word.slice(1) : word,
+    )
+    .join(" ");
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/components/WorkspaceRunButton/WorkspaceRunButton.tsx

@@ -0,0 +1,31 @@
+import { RunButton } from "metabase-enterprise/transforms/components/RunButton";
+import type {
+  TransformId,
+  TransformJobId,
+  TransformRun,
+} from "metabase-types/api";
+
+type WorkspaceRunButtonProps = {
+  id: TransformId | TransformJobId | undefined;
+  run: TransformRun | null | undefined;
+  isDisabled?: boolean;
+  allowCancellation?: boolean;
+  onRun: () => void;
+  onCancel?: () => void;
+};
+
+// A workspace-friendly wrapper that shows visual feedback during and after runs
+export function WorkspaceRunButton({ run, ...rest }: WorkspaceRunButtonProps) {
+  // Pass through active/completed run states for visual feedback
+  // - started/canceling: show in-progress state
+  // - succeeded/failed: show completion state (controlled by parent)
+  const activeRun =
+    run?.status === "started" ||
+    run?.status === "canceling" ||
+    run?.status === "succeeded" ||
+    run?.status === "failed"
+      ? run
+      : null;
+
+  return <RunButton run={activeRun} {...rest} />;
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/hooks/index.ts

@@ -0,0 +1 @@
+export { useWorkspaceTransformRun } from "./use-workspace-transform-run";

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/hooks/use-workspace-transform-run.ts

@@ -0,0 +1,185 @@
+import { useMemo, useState } from "react";
+import { t } from "ttag";
+
+import { useDispatch } from "metabase/lib/redux";
+import { useMetadataToasts } from "metabase/metadata/hooks";
+import {
+  DEFAULT_WORKSPACE_TABLES_QUERY_RESPONSE,
+  useGetWorkspaceTablesQuery,
+  useGetWorkspaceTransformQuery,
+  useRunWorkspaceTransformMutation,
+  workspaceApi,
+} from "metabase-enterprise/api";
+import type {
+  TransformRun,
+  WorkspaceId,
+  WorkspaceTransform,
+} from "metabase-types/api";
+
+type UseWorkspaceTransformRunOptions = {
+  workspaceId: WorkspaceId;
+  transform: WorkspaceTransform;
+};
+
+type UseWorkspaceTransformRunResult = {
+  /** Run object for RunStatus component - always shows last run info */
+  statusRun: TransformRun | null;
+  /** Run object for button - only shows feedback during/after user-triggered runs */
+  buttonRun: TransformRun | null;
+  /** Whether the run status is still loading */
+  isRunStatusLoading: boolean;
+  /** Whether a run is currently in progress */
+  isRunning: boolean;
+  /** Trigger a transform run */
+  handleRun: () => Promise<void>;
+  /** Output table info */
+  output: {
+    db_id: number;
+    table_id: number;
+    table_name: string;
+    schema: string;
+  } | null;
+};
+
+export function useWorkspaceTransformRun({
+  workspaceId,
+  transform,
+}: UseWorkspaceTransformRunOptions): UseWorkspaceTransformRunResult {
+  const dispatch = useDispatch();
+  const { sendErrorToast } = useMetadataToasts();
+  const [runTransform] = useRunWorkspaceTransformMutation();
+  const { data: workspaceTables = DEFAULT_WORKSPACE_TABLES_QUERY_RESPONSE } =
+    useGetWorkspaceTablesQuery(workspaceId);
+
+  const [isRunTriggered, setIsRunTriggered] = useState(false);
+  const [lastRunResult, setLastRunResult] = useState<{
+    status: "succeeded" | "failed";
+    end_time: string;
+    message: string | null;
+  } | null>(null);
+
+  // Fetch workspace transform to get updated last_run_at
+  const { data: fetchedWorkspaceTransform, isFetching } =
+    useGetWorkspaceTransformQuery(
+      {
+        workspaceId,
+        transformId: transform.ref_id,
+      },
+      { skip: !transform.ref_id },
+    );
+
+  const lastRunAt =
+    fetchedWorkspaceTransform?.last_run_at ?? transform.last_run_at;
+  const lastRunMessage =
+    fetchedWorkspaceTransform?.last_run_message ?? transform.last_run_message;
+
+  const lastRunStatus = lastRunMessage ? "failed" : "succeeded";
+
+  const statusRun: TransformRun | null = useMemo(
+    () =>
+      lastRunResult
+        ? {
+            id: -1,
+            status: lastRunResult.status,
+            start_time: lastRunResult.end_time,
+            end_time: lastRunResult.end_time,
+            message: lastRunResult.message,
+            run_method: "manual",
+          }
+        : lastRunAt
+          ? {
+              id: -1,
+              status: lastRunStatus,
+              start_time: lastRunAt,
+              end_time: lastRunAt,
+              message: lastRunMessage,
+              run_method: "manual",
+            }
+          : null,
+    [lastRunResult, lastRunAt, lastRunMessage, lastRunStatus],
+  );
+
+  const output = useMemo(() => {
+    const table = workspaceTables.outputs.find(
+      (table) => table.isolated.transform_id === transform.ref_id,
+    );
+    if (!table || statusRun?.status !== "succeeded") {
+      return null;
+    }
+    return {
+      db_id: table?.db_id,
+      table_id: table?.isolated.table_id,
+      table_name: table?.isolated.table,
+      schema: table?.isolated.schema,
+    };
+  }, [workspaceTables, transform.ref_id, statusRun]);
+
+  // Run object for button - only shows feedback during/after user-triggered runs
+  const buttonRun: TransformRun | null = isRunTriggered
+    ? {
+        id: -1,
+        status: "started",
+        start_time: new Date().toISOString(),
+        end_time: null,
+        message: null,
+        run_method: "manual",
+      }
+    : lastRunResult
+      ? {
+          id: -1,
+          status: lastRunResult.status,
+          start_time: lastRunResult.end_time,
+          end_time: lastRunResult.end_time,
+          message: lastRunResult.message,
+          run_method: "manual",
+        }
+      : null;
+
+  const handleRun = async () => {
+    try {
+      setIsRunTriggered(true);
+      setLastRunResult(null);
+
+      const result = await runTransform({
+        workspaceId,
+        transformId: transform.ref_id,
+      }).unwrap();
+
+      // Transform completed - store the result
+      const endTime = result.end_time ?? new Date().toISOString();
+      setLastRunResult({
+        status: result.status,
+        end_time: endTime,
+        message: result.message ?? null,
+      });
+      setIsRunTriggered(false);
+
+      // Invalidate caches to refetch updated data
+      dispatch(
+        workspaceApi.util.invalidateTags([
+          { type: "workspace", id: workspaceId },
+          { type: "workspace-transform", id: transform.ref_id },
+          { type: "workspace-tables", id: workspaceId },
+        ]),
+      );
+
+      if (result.status === "failed") {
+        sendErrorToast(t`Transform run failed`);
+      }
+    } catch (error) {
+      setIsRunTriggered(false);
+      setLastRunResult(null);
+      sendErrorToast(t`Failed to run transform`);
+      console.error("Failed to run transform", error);
+    }
+  };
+
+  return {
+    statusRun,
+    buttonRun,
+    isRunStatusLoading: statusRun == null && isFetching,
+    isRunning: isRunTriggered,
+    handleRun,
+    output,
+  };
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspaceListPage/WorkspaceListPage.tsx

@@ -0,0 +1,57 @@
+import { useEffect, useMemo } from "react";
+import { replace } from "react-router-redux";
+import { t } from "ttag";
+
+import { LoadingAndErrorWrapper } from "metabase/common/components/LoadingAndErrorWrapper";
+import { useDispatch } from "metabase/lib/redux";
+import * as Urls from "metabase/lib/urls";
+import { Box, Text, Title } from "metabase/ui";
+import { useGetWorkspacesQuery } from "metabase-enterprise/api";
+
+export function WorkspaceListPage() {
+  const dispatch = useDispatch();
+  const {
+    data: workspacesData,
+    error,
+    isLoading,
+    isFetching,
+  } = useGetWorkspacesQuery();
+
+  const workspaces = useMemo(
+    () => workspacesData?.items ?? [],
+    [workspacesData],
+  );
+
+  const firstWorkspaceId = workspaces[0]?.id;
+
+  useEffect(() => {
+    if (error || firstWorkspaceId == null) {
+      return;
+    }
+
+    dispatch(replace(Urls.dataStudioWorkspace(firstWorkspaceId)));
+  }, [dispatch, error, firstWorkspaceId]);
+
+  if (error) {
+    return <LoadingAndErrorWrapper error={error} loading={false} />;
+  }
+
+  if (firstWorkspaceId != null) {
+    return null;
+  }
+
+  if (isLoading || isFetching) {
+    return (
+      <LoadingAndErrorWrapper error={error} loading={isLoading || isFetching} />
+    );
+  }
+
+  return (
+    <Box data-testid="workspaces-page" p="lg">
+      <Title size="lg">{t`No active workspaces`}</Title>
+      <Text c="text-secondary">
+        {t`Create a new one from the left panel or by editing an existing transform.`}
+      </Text>
+    </Box>
+  );
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/AddTransformMenu.tsx

@@ -0,0 +1,89 @@
+import { t } from "ttag";
+
+import { ActionIcon, Icon, Menu } from "metabase/ui";
+import {
+  getInitialNativeSource,
+  getInitialPythonSource,
+} from "metabase-enterprise/transforms/pages/NewTransformPage/utils";
+import type {
+  DatabaseId,
+  TransformSource,
+  WorkspaceId,
+} from "metabase-types/api";
+import { createMockTransform } from "metabase-types/api/mocks/transform";
+
+import { useWorkspace } from "./WorkspaceProvider";
+
+type TransformType = "sql" | "python";
+
+interface Props {
+  databaseId: DatabaseId;
+  workspaceId: WorkspaceId;
+  disabled?: boolean;
+}
+
+export const AddTransformMenu = ({
+  databaseId,
+  workspaceId,
+  disabled,
+}: Props) => {
+  const { addUnsavedTransform } = useWorkspace();
+
+  const getSource = (type: TransformType): TransformSource => {
+    if (type === "sql") {
+      const source = getInitialNativeSource();
+      return {
+        ...source,
+        query: { ...source.query, database: databaseId },
+      };
+    }
+    return {
+      ...getInitialPythonSource(),
+      "source-database": databaseId,
+    };
+  };
+
+  return (
+    <>
+      <Menu position="bottom-end">
+        <Menu.Target>
+          <ActionIcon
+            size="2rem"
+            p="0"
+            ml="auto"
+            aria-label={t`Add transform`}
+            disabled={disabled}
+          >
+            <Icon name="add" size={16} aria-hidden tooltip={t`Add transform`} />
+          </ActionIcon>
+        </Menu.Target>
+        <Menu.Dropdown>
+          <Menu.Item
+            leftSection={<Icon name="sql" />}
+            onClick={() => {
+              const mockTransform = createMockTransform({
+                source: getSource("sql"),
+                workspace_id: workspaceId,
+              });
+              addUnsavedTransform(mockTransform);
+            }}
+          >
+            {t`SQL Transform`}
+          </Menu.Item>
+          <Menu.Item
+            leftSection={<Icon name="code_block" />}
+            onClick={() => {
+              const mockTransform = createMockTransform({
+                source: getSource("python"),
+                workspace_id: workspaceId,
+              });
+              addUnsavedTransform(mockTransform);
+            }}
+          >
+            {t`Python Script`}
+          </Menu.Item>
+        </Menu.Dropdown>
+      </Menu>
+    </>
+  );
+};

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/CodeTab/CodeTab.tsx

@@ -0,0 +1,179 @@
+import { useCallback } from "react";
+import { t } from "ttag";
+
+import EmptyState from "metabase/common/components/EmptyState";
+import { Stack, Text } from "metabase/ui";
+import {
+  useLazyGetTransformQuery,
+  useLazyGetWorkspaceTransformQuery,
+} from "metabase-enterprise/api";
+import type {
+  ExternalTransform,
+  Transform,
+  WorkspaceId,
+  WorkspaceTransform,
+} from "metabase-types/api";
+
+import { useWorkspace } from "../WorkspaceProvider";
+
+import { TransformListItem } from "./TransformListItem";
+import { TransformListItemMenu } from "./TransformListItemMenu";
+
+type CodeTabProps = {
+  activeTransformId?: number | string;
+  availableTransforms: ExternalTransform[];
+  workspaceId: WorkspaceId;
+  workspaceTransforms: WorkspaceTransform[];
+  onTransformClick: (transform: Transform | WorkspaceTransform) => void;
+};
+
+export const CodeTab = ({
+  activeTransformId,
+  availableTransforms,
+  workspaceId,
+  workspaceTransforms,
+  onTransformClick,
+}: CodeTabProps) => {
+  const { editedTransforms, hasTransformEdits } = useWorkspace();
+
+  const [fetchWorkspaceTransform] = useLazyGetWorkspaceTransformQuery();
+  const [fetchTransform] = useLazyGetTransformQuery();
+
+  const normalizeTransformId = useCallback(
+    (transform: Transform | WorkspaceTransform) =>
+      "ref_id" in transform ? transform.ref_id : transform.id,
+    [],
+  );
+
+  const handleTransformClick = useCallback(
+    (transform: Transform | WorkspaceTransform) => {
+      const transformId = normalizeTransformId(transform);
+      const edited = editedTransforms.get(transformId);
+      const transformToOpen =
+        edited != null ? { ...transform, ...edited } : transform;
+
+      onTransformClick(transformToOpen);
+    },
+    [editedTransforms, normalizeTransformId, onTransformClick],
+  );
+
+  const handleExternalTransformClick = useCallback(
+    async (externalTransform: ExternalTransform) => {
+      if (externalTransform.checkout_disabled) {
+        return;
+      }
+
+      const { data: transform } = await fetchTransform(
+        externalTransform.id,
+        true,
+      );
+
+      if (transform) {
+        handleTransformClick(transform);
+      }
+    },
+    [fetchTransform, handleTransformClick],
+  );
+
+  const handleWorkspaceTransformClick = useCallback(
+    async (workspaceTransform: WorkspaceTransform) => {
+      if (
+        typeof workspaceTransform.id === "number" &&
+        workspaceTransform.id < 0
+      ) {
+        return handleTransformClick(workspaceTransform);
+      }
+
+      const { data: transform } = await fetchWorkspaceTransform(
+        {
+          workspaceId,
+          transformId: workspaceTransform.ref_id,
+        },
+        true,
+      );
+
+      if (transform) {
+        handleTransformClick(transform);
+      }
+    },
+    [fetchWorkspaceTransform, workspaceId, handleTransformClick],
+  );
+
+  return (
+    <Stack h="100%" gap={0}>
+      <Stack
+        data-testid="workspace-transforms"
+        gap="xs"
+        pb="sm"
+        style={{
+          borderBottom: "1px solid var(--mb-color-border)",
+        }}
+      >
+        <Stack gap={0}>
+          <Text fw={600}>{t`Workspace transforms`}</Text>
+          {workspaceTransforms.map((transform) => {
+            const isEdited = hasTransformEdits(transform);
+            const isActive =
+              typeof activeTransformId === "string" &&
+              activeTransformId === transform.ref_id;
+
+            return (
+              <TransformListItem
+                key={transform.ref_id}
+                name={transform.name}
+                icon="pivot_table"
+                fw={600}
+                isActive={isActive}
+                isEdited={isEdited}
+                menu={
+                  <TransformListItemMenu
+                    transform={transform}
+                    workspaceId={workspaceId}
+                  />
+                }
+                onClick={() => {
+                  handleWorkspaceTransformClick(transform);
+                }}
+              />
+            );
+          })}
+        </Stack>
+
+        {workspaceTransforms.length === 0 && (
+          <EmptyState message={t`Workspace is empty`} />
+        )}
+      </Stack>
+
+      <Stack data-testid="mainland-transforms" py="sm" gap="xs">
+        <Text fw={600} mt="sm">{t`Available transforms`}</Text>
+        {availableTransforms.map((transform) => {
+          const tooltipLabel =
+            transform.checkout_disabled === "mbql"
+              ? t`This transform cannot be edited in a workspace because it uses MBQL.`
+              : transform.checkout_disabled === "card-reference"
+                ? t`This transform cannot be edited in a workspace because it references other questions.`
+                : transform.checkout_disabled
+                  ? t`This transform cannot be edited in a workspace.`
+                  : undefined;
+
+          return (
+            <TransformListItem
+              key={transform.id}
+              name={transform.name}
+              isActive={activeTransformId === transform.id}
+              isEdited={editedTransforms.has(transform.id)}
+              onClick={() => {
+                handleExternalTransformClick(transform);
+              }}
+              opacity={transform.checkout_disabled ? 0.5 : 1}
+              tooltipLabel={tooltipLabel}
+            />
+          );
+        })}
+        {availableTransforms.length === 0 && (
+          <EmptyState message={t`No available transforms`} />
+        )}
+      </Stack>
+    </Stack>
+  );
+};

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/CodeTab/TransformListItem.module.css

@@ -0,0 +1,33 @@
+.root {
+  display: flex;
+  align-items: center;
+  gap: var(--mantine-spacing-sm);
+  padding: var(--mantine-spacing-xs) var(--mantine-spacing-sm);
+  border-radius: var(--mantine-radius-sm);
+  cursor: default;
+  flex-wrap: nowrap;
+
+  &:hover .menu {
+    visibility: visible;
+  }
+
+  &:hover {
+    background-color: var(--mb-color-bg-light);
+  }
+}
+
+.label {
+  display: flex;
+  align-items: center;
+  gap: var(--mantine-spacing-sm);
+  flex: 1;
+  min-width: 0;
+}
+
+.cursorPointer {
+  cursor: pointer;
+}
+
+.menu {
+  visibility: hidden;
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/CodeTab/TransformListItem.tsx

@@ -0,0 +1,62 @@
+import cx from "classnames";
+import type { ReactNode } from "react";
+
+import {
+  Box,
+  type BoxProps,
+  Icon,
+  type IconName,
+  Text,
+  Tooltip,
+} from "metabase/ui";
+
+import { StatusDot } from "../components/StatusDot/StatusDot";
+
+import S from "./TransformListItem.module.css";
+
+type TransformListItemProps = {
+  name: string;
+  icon?: IconName;
+  isActive?: boolean;
+  isEdited?: boolean;
+  tooltipLabel?: string;
+  menu?: ReactNode;
+  onClick?: () => void;
+} & BoxProps;
+
+export const TransformListItem = ({
+  name,
+  icon = "database",
+  isActive,
+  isEdited,
+  tooltipLabel,
+  menu,
+  onClick,
+  ...props
+}: TransformListItemProps) => {
+  const label = (
+    <Box className={cx(S.label, { [S.cursorPointer]: !tooltipLabel })}>
+      <Icon name={icon} size={14} c="brand" />
+      <Text c={isActive ? "brand" : "text-dark"} truncate>
+        {name}
+      </Text>
+      {isEdited && <StatusDot status="changed" />}
+    </Box>
+  );
+
+  return (
+    <Box className={S.root} onClick={onClick} pl="sm" {...props}>
+      {tooltipLabel ? (
+        <Tooltip label={tooltipLabel} position="top">
+          {label}
+        </Tooltip>
+      ) : (
+        label
+      )}
+
+      <Box className={S.menu} flex="0 0 auto">
+        {menu}
+      </Box>
+    </Box>
+  );
+};

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/CodeTab/TransformListItemMenu.tsx

@@ -0,0 +1,74 @@
+import { t } from "ttag";
+
+import { useMetadataToasts } from "metabase/metadata/hooks";
+import { ActionIcon, Icon, Menu } from "metabase/ui";
+import { useDeleteWorkspaceTransformMutation } from "metabase-enterprise/api";
+import type {
+  Transform,
+  WorkspaceId,
+  WorkspaceTransformItem,
+} from "metabase-types/api";
+
+import { useWorkspace } from "../WorkspaceProvider";
+
+interface Props {
+  transform: WorkspaceTransformItem | Transform;
+  workspaceId: WorkspaceId;
+}
+
+export function TransformListItemMenu({ transform, workspaceId }: Props) {
+  const [deleteWorkspaceTransform] = useDeleteWorkspaceTransformMutation();
+
+  const {
+    removeEditedTransform,
+    removeOpenedTransform,
+    removeUnsavedTransform,
+  } = useWorkspace();
+  const { sendErrorToast, sendSuccessToast } = useMetadataToasts();
+
+  const handleRemove = async () => {
+    // Handle unsaved transforms (negative IDs) locally
+    if ("id" in transform && transform.id < 0) {
+      removeUnsavedTransform(transform.id);
+      return;
+    }
+
+    if (!("ref_id" in transform)) {
+      return;
+    }
+
+    try {
+      await deleteWorkspaceTransform({
+        workspaceId,
+        transformId: transform.ref_id,
+      }).unwrap();
+
+      sendSuccessToast(t`Transform removed from the workspace`);
+      removeEditedTransform(transform.ref_id);
+      removeOpenedTransform(transform.ref_id);
+    } catch (error) {
+      console.error("Failed to remove transform:", error);
+      sendErrorToast(t`Failed to remove transform from the workspace`);
+    }
+  };
+
+  return (
+    <Menu position="bottom-end" withinPortal>
+      <Menu.Target>
+        <ActionIcon
+          onClick={(event) => event.stopPropagation()}
+          size="sm"
+          variant="subtle"
+        >
+          <Icon name="ellipsis" />
+        </ActionIcon>
+      </Menu.Target>
+
+      <Menu.Dropdown onClick={(event) => event.stopPropagation()}>
+        <Menu.Item leftSection={<Icon name="trash" />} onClick={handleRemove}>
+          {t`Remove`}
+        </Menu.Item>
+      </Menu.Dropdown>
+    </Menu>
+  );
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/DataTab/DataTab.tsx

@@ -0,0 +1,89 @@
+import { useMemo } from "react";
+import { t } from "ttag";
+
+import { createMockMetadata } from "__support__/metadata";
+import { skipToken, useGetTableQuery } from "metabase/api";
+import { LoadingAndErrorWrapper } from "metabase/common/components/LoadingAndErrorWrapper";
+import CS from "metabase/css/core/index.css";
+import { Box, Stack, Text } from "metabase/ui";
+import Visualization from "metabase/visualizations/components/Visualization";
+import { useGetWorkspaceTransformQuery } from "metabase-enterprise/api";
+import type { DatabaseId, TableId } from "metabase-types/api";
+
+import { useTablePreview } from "./useTablePreview";
+
+interface DataTabProps {
+  workspaceId: number;
+  databaseId: DatabaseId | null;
+  tableId: TableId | null;
+  transformId?: string;
+}
+
+export function DataTab({
+  workspaceId,
+  databaseId,
+  tableId,
+  transformId,
+}: DataTabProps) {
+  const { data: table } = useGetTableQuery(
+    tableId ? { id: tableId } : skipToken,
+  );
+  const { data: transform } = useGetWorkspaceTransformQuery(
+    transformId ? { workspaceId, transformId } : skipToken,
+  );
+  const metadata = useMemo(
+    () =>
+      createMockMetadata({
+        tables: table
+          ? [
+              {
+                ...table,
+                visibility_type: null,
+              },
+            ]
+          : [],
+      }),
+    [table],
+  );
+
+  const { rawSeries, isFetching, error } = useTablePreview({
+    databaseId,
+    tableId,
+    metadata,
+    last_transform_run_time: transform?.last_run_at,
+  });
+
+  if (!databaseId || !tableId) {
+    return (
+      <Stack h="100%" align="center" justify="center">
+        <Text c="text-medium">{t`Select a table to view its data`}</Text>
+      </Stack>
+    );
+  }
+
+  if (isFetching) {
+    return <LoadingAndErrorWrapper loading />;
+  }
+
+  if (error) {
+    return (
+      <Stack h="100%" align="center" justify="center">
+        <Text c="error">{t`Error loading data`}</Text>
+      </Stack>
+    );
+  }
+
+  if (!rawSeries) {
+    return (
+      <Stack h="100%" align="center" justify="center">
+        <Text c="text-medium">{t`No data available`}</Text>
+      </Stack>
+    );
+  }
+
+  return (
+    <Box h="100%" className={CS.relative}>
+      <Visualization queryBuilderMode="dataset" rawSeries={rawSeries} />
+    </Box>
+  );
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/DataTab/DataTabSidebar.tsx

@@ -0,0 +1,105 @@
+import { t } from "ttag";
+
+import { Stack, Text } from "metabase/ui";
+import type {
+  TableId,
+  Transform,
+  WorkspaceTablesResponse,
+  WorkspaceTransformItem,
+} from "metabase-types/api";
+
+import { type OpenTable, useWorkspace } from "../WorkspaceProvider";
+
+import { TableListItem } from "./TableListItem";
+
+type DataTabSidebarProps = {
+  tables: WorkspaceTablesResponse;
+  workspaceTransforms: WorkspaceTransformItem[];
+  dbTransforms: Transform[];
+  selectedTableId?: TableId | null;
+  runningTransforms?: Set<string>;
+  onTransformClick?: (transform: WorkspaceTransformItem) => void;
+  onTableSelect?: (table: OpenTable) => void;
+  onRunTransform?: (transform: WorkspaceTransformItem) => void;
+};
+
+export const DataTabSidebar = ({
+  tables,
+  workspaceTransforms,
+  dbTransforms,
+  selectedTableId,
+  runningTransforms,
+  onTransformClick,
+  onTableSelect,
+  onRunTransform,
+}: DataTabSidebarProps) => {
+  const { hasTransformEdits } = useWorkspace();
+  return (
+    <Stack h="100%" gap="sm">
+      <Stack
+        gap="xs"
+        pb="sm"
+        style={{ borderBottom: "1px solid var(--mb-color-border)" }}
+      >
+        <Text fw={600}>{t`Data active in this workspace`}</Text>
+        {tables.outputs.length > 0 && (
+          <Text size="sm" fw={600} c="text-tertiary">{t`Output tables`}</Text>
+        )}
+        <Stack gap={0}>
+          {tables.outputs.map((table, index: number) => {
+            const workspaceTransform = workspaceTransforms.find(
+              (t) => t["ref_id"] === table.isolated.transform_id,
+            );
+            const originalTransform = workspaceTransform?.global_id
+              ? dbTransforms.find((t) => t.id === workspaceTransform.global_id)
+              : undefined;
+            const hasChanges = originalTransform
+              ? hasTransformEdits(originalTransform)
+              : false;
+            const tableId = table.isolated.table_id;
+
+            return (
+              <TableListItem
+                key={`output-${index}`}
+                name={table.global.table}
+                schema={table.global.schema}
+                icon="pivot_table"
+                type="output"
+                hasChanges={hasChanges}
+                transform={workspaceTransform}
+                tableId={tableId ?? undefined}
+                isSelected={tableId === selectedTableId}
+                isRunning={
+                  workspaceTransform
+                    ? runningTransforms?.has(workspaceTransform.ref_id)
+                    : false
+                }
+                onTransformClick={onTransformClick}
+                onTableClick={onTableSelect}
+                onRunTransform={onRunTransform}
+              />
+            );
+          })}
+        </Stack>
+        {tables.inputs.length > 0 && (
+          <Text size="sm" fw={600} c="text-tertiary">{t`Input tables`}</Text>
+        )}
+        <Stack gap={0}>
+          {tables.inputs.map((table, index) => (
+            <TableListItem
+              key={`input-${index}`}
+              name={table.table}
+              schema={table.schema}
+              icon="table"
+              type="input"
+              isSelected={table.table_id === selectedTableId}
+              tableId={table.table_id ?? undefined}
+              onTransformClick={onTransformClick}
+              onTableClick={onTableSelect}
+            />
+          ))}
+        </Stack>
+      </Stack>
+    </Stack>
+  );
+};

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/DataTab/TableListItem.module.css

@@ -0,0 +1,34 @@
+.root {
+  display: flex;
+  align-items: center;
+  gap: var(--mantine-spacing-sm);
+  padding: var(--mantine-spacing-xs) var(--mantine-spacing-sm);
+  border-radius: var(--mantine-radius-sm);
+  flex-wrap: nowrap;
+
+  &:hover .menu {
+    visibility: visible;
+  }
+
+  &:hover {
+    background-color: var(--mb-color-bg-light);
+  }
+}
+
+.clickable {
+  cursor: pointer;
+}
+
+.selected {
+  background-color: var(--mb-color-bg-medium);
+}
+.name {
+  flex: 1;
+  min-width: 0;
+}
+
+.actionIcon {
+  &:hover {
+    background-color: var(--mb-color-bg-medium) !important;
+  }
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/DataTab/TableListItem.tsx

@@ -0,0 +1,126 @@
+import cx from "classnames";
+import { t } from "ttag";
+
+import {
+  ActionIcon,
+  Box,
+  Icon,
+  type IconName,
+  Loader,
+  Text,
+  Tooltip,
+} from "metabase/ui";
+import type { TableId, WorkspaceTransformItem } from "metabase-types/api";
+
+import type { OpenTable } from "../WorkspaceProvider";
+import { StatusDot } from "../components/StatusDot/StatusDot";
+
+import S from "./TableListItem.module.css";
+
+type TableListItemProps = {
+  name: string;
+  schema?: string | null;
+  icon?: IconName;
+  type: "input" | "output";
+  hasChanges?: boolean;
+  transform?: WorkspaceTransformItem;
+  tableId?: TableId;
+  isSelected?: boolean;
+  isRunning?: boolean;
+  onTransformClick?: (transform: WorkspaceTransformItem) => void;
+  onTableClick?: (table: OpenTable) => void;
+  onRunTransform?: (transform: WorkspaceTransformItem) => void;
+};
+
+export const TableListItem = ({
+  name,
+  schema,
+  icon = "table",
+  type,
+  hasChanges = false,
+  transform,
+  tableId,
+  isSelected = false,
+  isRunning = false,
+  onTransformClick,
+  onTableClick,
+  onRunTransform,
+}: TableListItemProps) => {
+  const displayName = schema ? `${schema}.${name}` : name;
+
+  const handleTransformClick = (e: React.MouseEvent) => {
+    e.stopPropagation();
+    if (transform && onTransformClick) {
+      onTransformClick(transform);
+    }
+  };
+
+  const handleTableClick = () => {
+    if (isRunning) {
+      return;
+    }
+    if (tableId && onTableClick) {
+      onTableClick({ tableId, name, schema, transformId: transform?.ref_id });
+    } else if (type === "output" && transform && onRunTransform) {
+      onRunTransform(transform);
+    }
+  };
+
+  const hasResults = type === "output" && !!tableId;
+  const canRunTransform =
+    type === "output" && !hasResults && transform && onRunTransform;
+  const isClickable = (tableId && onTableClick) || canRunTransform;
+  const displayTooltip = type !== "input" && !hasResults && !isRunning;
+
+  return (
+    <Box
+      className={cx(S.root, {
+        [S.selected]: isSelected,
+        [S.clickable]: isClickable,
+      })}
+      aria-label={displayName}
+      onClick={isClickable ? handleTableClick : undefined}
+    >
+      {isRunning ? (
+        <Loader size="sm" />
+      ) : (
+        <Icon
+          name={icon}
+          size={14}
+          c={type === "input" ? "saturated-green" : "saturated-yellow"}
+        />
+      )}
+      <Tooltip
+        label={
+          isRunning
+            ? t`Running transform...`
+            : t`Run transform to see the results`
+        }
+        position="top"
+        disabled={!displayTooltip && !isRunning}
+      >
+        <Text
+          className={S.name}
+          c={displayTooltip ? "text-light" : "text-dark"}
+          truncate
+        >
+          {displayName}
+        </Text>
+      </Tooltip>
+      {hasChanges && <StatusDot status="changed" />}
+      {type === "output" && transform && (
+        <Tooltip label={t`Open transform`} position="top">
+          <ActionIcon
+            className={S.actionIcon}
+            ml="auto"
+            size="sm"
+            variant="subtle"
+            onClick={handleTransformClick}
+          >
+            <Icon name="code_block" size={14} c="text-medium" />
+          </ActionIcon>
+        </Tooltip>
+      )}
+    </Box>
+  );
+};

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/DataTab/index.ts

@@ -0,0 +1,4 @@
+export { DataTab } from "./DataTab";
+export { DataTabSidebar } from "./DataTabSidebar";
+export { useTablePreview as useTableQuestion } from "./useTablePreview";
+export type { OpenTable } from "../WorkspaceProvider";

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/DataTab/useTablePreview.ts

@@ -0,0 +1,91 @@
+import { useMemo } from "react";
+import _ from "underscore";
+
+import { skipToken, useGetAdhocQueryQuery } from "metabase/api";
+import { getErrorMessage } from "metabase/api/utils";
+import * as Lib from "metabase-lib";
+import type Metadata from "metabase-lib/v1/metadata/Metadata";
+import type { DatabaseId, RawSeries, TableId } from "metabase-types/api";
+import { createMockCard } from "metabase-types/api/mocks";
+
+interface UseTableQuestionProps {
+  databaseId: DatabaseId | null;
+  tableId: TableId | null;
+  metadata: Metadata;
+  last_transform_run_time?: string | null;
+}
+
+interface UseTablePreviewResult {
+  rawSeries?: RawSeries;
+  isFetching: boolean;
+  isLoading: boolean;
+  isError: boolean;
+  error?: string;
+}
+
+export function useTablePreview({
+  databaseId,
+  tableId,
+  metadata,
+  last_transform_run_time,
+}: UseTableQuestionProps): UseTablePreviewResult {
+  const metadataProvider =
+    Object.keys(metadata.tables).length > 0
+      ? Lib.metadataProvider(databaseId, metadata)
+      : null;
+
+  const table =
+    metadataProvider && tableId
+      ? Lib.tableOrCardMetadata(metadataProvider, tableId)
+      : null;
+
+  const query =
+    table && metadataProvider
+      ? Lib.queryFromTableOrCardMetadata(metadataProvider, table)
+      : null;
+
+  const { data, ...rest } = useGetAdhocQueryQuery(
+    query == null
+      ? skipToken
+      : {
+          ...Lib.toJsQuery(query),
+          ignore_error: true,
+          _refetchDeps: last_transform_run_time,
+        },
+  );
+  const base = {
+    ...rest,
+    error: rest.error ? getErrorMessage(rest.error) : undefined,
+    rawSeries: undefined,
+  };
+
+  const rawSeries = useMemo(
+    () =>
+      query
+        ? [
+            {
+              card: createMockCard({
+                dataset_query: Lib.toJsQuery(query),
+                display: "table",
+                visualization_settings: {},
+              }),
+              data: {
+                ...data?.data,
+                rows: _.uniq(data?.data?.rows ?? []),
+              },
+            },
+          ]
+        : ([] as RawSeries),
+    [data?.data, query],
+  );
+
+  if (data?.status === "failed") {
+    return { ...base, isError: true, error: getErrorMessage(data) };
+  }
+
+  if (query == null || !data?.data || data.data.cols.length === 0) {
+    return base;
+  }
+
+  return { ...base, rawSeries };
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/MetabotTab.tsx

@@ -0,0 +1,29 @@
+import { PLUGIN_METABOT } from "metabase/plugins";
+import { useRegisterMetabotTransformContext } from "metabase-enterprise/transforms/hooks/use-register-transform-metabot-context";
+import type { DraftTransformSource, Transform } from "metabase-types/api";
+
+type MetabotTabProps = {
+  transform?: Transform;
+  source?: DraftTransformSource;
+};
+
+const MetabotContextRegistration = ({ transform, source }: MetabotTabProps) => {
+  useRegisterMetabotTransformContext(transform, source);
+  return null;
+};
+
+export const MetabotTab = ({ transform, source }: MetabotTabProps) => {
+  const MetabotProvider = PLUGIN_METABOT.getMetabotProvider();
+  const MetabotChat = PLUGIN_METABOT.MetabotChat;
+  const metabotConfig = {
+    // Show top-level mention menu for transforms and databases.
+    suggestionModels: ["transform", "database"],
+  };
+
+  return (
+    <MetabotProvider>
+      <MetabotContextRegistration transform={transform} source={source} />
+      <MetabotChat config={metabotConfig} />
+    </MetabotProvider>
+  );
+};

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/PreviewTab/PreviewTab.tsx

@@ -0,0 +1,50 @@
+import { useMemo } from "react";
+import { t } from "ttag";
+
+import { LoadingAndErrorWrapper } from "metabase/common/components/LoadingAndErrorWrapper";
+import CS from "metabase/css/core/index.css";
+import { Box, Stack, Text } from "metabase/ui";
+import Visualization from "metabase/visualizations/components/Visualization";
+import type { Dataset, RawSeries } from "metabase-types/api";
+import { createMockCard } from "metabase-types/api/mocks";
+
+interface PreviewTabProps {
+  dataset: Dataset | null;
+  isLoading?: boolean;
+}
+
+export function PreviewTab({ dataset, isLoading }: PreviewTabProps) {
+  const rawSeries: RawSeries = useMemo(() => {
+    if (!dataset?.data || dataset.data.cols.length === 0) {
+      return [];
+    }
+
+    return [
+      {
+        card: createMockCard({
+          display: "table",
+          visualization_settings: {},
+        }),
+        data: dataset.data,
+      },
+    ];
+  }, [dataset?.data]);
+
+  if (isLoading) {
+    return <LoadingAndErrorWrapper loading />;
+  }
+
+  if (!dataset?.data || dataset.data.cols.length === 0) {
+    return (
+      <Stack h="100%" align="center" justify="center">
+        <Text c="text-medium">{t`No data available`}</Text>
+      </Stack>
+    );
+  }
+
+  return (
+    <Box h="100%" className={CS.relative}>
+      <Visualization queryBuilderMode="dataset" rawSeries={rawSeries} />
+    </Box>
+  );
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/PreviewTab/index.ts

@@ -0,0 +1 @@
+export { PreviewTab } from "./PreviewTab";

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/SaveTransformButton.tsx

@@ -0,0 +1,61 @@
+import { t } from "ttag";
+
+import { Button } from "metabase/ui";
+import { useUpdateWorkspaceTransformMutation } from "metabase-enterprise/api";
+import { isSameSource } from "metabase-enterprise/transforms/utils";
+import type { DatabaseId, WorkspaceTransform } from "metabase-types/api";
+
+import { useWorkspace } from "./WorkspaceProvider";
+
+interface Props {
+  databaseId: DatabaseId;
+  editedTransform: WorkspaceTransform;
+  transform: WorkspaceTransform;
+  workspaceId: number;
+  isArchived: boolean;
+}
+
+export const SaveTransformButton = ({
+  databaseId,
+  editedTransform,
+  transform,
+  workspaceId,
+  isArchived,
+}: Props) => {
+  const [updateTransform] = useUpdateWorkspaceTransformMutation();
+  const { updateTransformState } = useWorkspace();
+
+  const hasSourceChanged = !isSameSource(
+    editedTransform.source,
+    transform.source,
+  );
+  const hasTargetNameChanged =
+    transform.target.name !== editedTransform.target.name;
+  const hasChanges = hasSourceChanged || hasTargetNameChanged;
+
+  const handleClick = async () => {
+    const updated = await updateTransform({
+      workspaceId,
+      transformId: transform.id,
+      source: editedTransform.source,
+      name: editedTransform.name,
+      target: {
+        type: "table",
+        name: editedTransform.target.name,
+        schema: transform.target.schema,
+        database: databaseId,
+      },
+    }).unwrap();
+
+    updateTransformState(updated);
+  };
+
+  return (
+    <Button
+      disabled={!hasChanges || isArchived}
+      size="sm"
+      variant="filled"
+      onClick={handleClick}
+    >{t`Save`}</Button>
+  );
+};

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/SetupLog.tsx

@@ -0,0 +1,106 @@
+import { useEffect, useMemo, useState } from "react";
+import { match } from "ts-pattern";
+import { t } from "ttag";
+
+import LoadingAndGenericErrorWrapper from "metabase/common/components/LoadingAndGenericErrorWrapper";
+import { Group, Icon, Loader, Stack, Tooltip } from "metabase/ui";
+import { useGetWorkspaceLogQuery } from "metabase-enterprise/api";
+import type { WorkspaceId, WorkspaceLogStatus } from "metabase-types/api";
+
+interface SetupTabProps {
+  workspaceId: WorkspaceId;
+}
+
+const LOGS_POLLING_INTERVAL = 1000;
+
+export const SetupLog = ({ workspaceId }: SetupTabProps) => {
+  const [shouldPoll, setShouldPoll] = useState(true);
+  const {
+    data: workspace,
+    error,
+    isLoading,
+  } = useGetWorkspaceLogQuery(workspaceId, {
+    pollingInterval: LOGS_POLLING_INTERVAL,
+    refetchOnMountOrArgChange: true,
+    skip: !shouldPoll,
+  });
+  useEffect(() => {
+    if (
+      workspace?.status === "ready" ||
+      workspace?.status === "archived" ||
+      workspace?.status === "uninitialized"
+    ) {
+      setShouldPoll(false);
+    }
+  }, [workspace?.status]);
+
+  const logs = useMemo(() => workspace?.logs ?? [], [workspace]);
+
+  if (error || isLoading) {
+    return <LoadingAndGenericErrorWrapper error={error} loading={isLoading} />;
+  }
+
+  return (
+    <Stack
+      bd="1px solid var(--mb-color-border)"
+      bg="background-info"
+      bdrs="md"
+      gap="sm"
+      p="md"
+    >
+      {logs.length === 0 && workspace?.status === "pending" && (
+        <Loader size="xs" />
+      )}
+
+      {logs.map((log) => {
+        return (
+          <Group gap="xs" key={log.id}>
+            <Tooltip disabled={!log.message} label={log.message}>
+              <Group>
+                <LogIcon status={log.status} />
+              </Group>
+            </Tooltip>
+
+            <span>
+              {log.description}
+              {log.status === "started" && "…"}
+            </span>
+          </Group>
+        );
+      })}
+
+      {workspace?.status === "ready" && (
+        <Group gap="xs">
+          <LogIcon status="success" />
+
+          {t`Workspace ready!`}
+        </Group>
+      )}
+
+      {workspace?.status === "archived" && (
+        <Group gap="xs">
+          <Icon c="text-light" name="archive" />
+
+          {t`Workspace is archived`}
+        </Group>
+      )}
+    </Stack>
+  );
+};
+
+function LogIcon({ status }: { status: WorkspaceLogStatus | null }) {
+  return match(status)
+    .with("failure", () => {
+      return <Icon c="warning" name="warning_triangle_filled" />;
+    })
+    .with("started", () => {
+      return <Loader size="xs" />;
+    })
+    .with("success", () => {
+      return <Icon c="success" name="check" />;
+    })
+    .with(null, () => {
+      return <Icon name="chevronright" />;
+    })
+    .exhaustive();
+}

enterprise/frontend/src/metabase-enterprise/data-studio/workspaces/pages/WorkspacePage/SetupTab.tsx

@@ -0,0 +1,104 @@
+import { useCallback } from "react";
+import { t } from "ttag";
+
+import { useMetadataToasts } from "metabase/metadata/hooks";
+import { Select, Stack, Text, Title } from "metabase/ui";
+import {
+  useGetWorkspaceAllowedDatabasesQuery,
+  useUpdateWorkspaceMutation,
+} from "metabase-enterprise/api/workspace";
+import type { Workspace } from "metabase-types/api";
+
+import { isWorkspaceUninitialized } from "../../utils";
+
+import { SetupLog } from "./SetupLog";
+
+interface SetupTabProps {
+  databaseId?: number;
+  workspace: Workspace;
+}
+
+export const SetupTab = ({ databaseId, workspace }: SetupTabProps) => {
+  const { data: allowedDatabases, isLoading } =
+    useGetWorkspaceAllowedDatabasesQuery();
+  const [updateWorkspace, { isLoading: isUpdating }] =
+    useUpdateWorkspaceMutation();
+  const { sendErrorToast, sendSuccessToast } = useMetadataToasts();
+  const workspaceId = workspace.id;
+
+  const handleDatabaseChange = useCallback(
+    async (value: string) => {
+      const newDatabaseId = Number(value);
+      if (newDatabaseId !== databaseId) {
+        try {
+          await updateWorkspace({
+            id: workspaceId,
+            database_id: newDatabaseId,
+          }).unwrap();
+          sendSuccessToast(t`Successfully updated workspace database`);
+        } catch (error) {
+          console.error("Failed to update workspace database:", error);
+          sendErrorToast(t`Failed to update workspace database`);
+        }
+      }
+    },
+    [
+      databaseId,
+      workspaceId,
+      updateWorkspace,
+      sendErrorToast,
+      sendSuccessToast,
+    ],
+  );
+
+  const databaseOptions =
+    allowedDatabases?.databases
+      ?.filter((db) => db.supported)
+      ?.map((db) => ({
+        value: db.id.toString(),
+        label: db.name,
+      })) ?? [];
+
+  return (
+    <Stack gap="lg">
+      <Stack gap="xs">
+        <Title order={3}>{t`Workspace Setup`}</Title>
+
+        <Text c="text-medium">
+          {t`Configure your data warehouse connection for this workspace`}
+        </Text>
+      </Stack>
+
+      <Stack gap="xs">
+        <Text fw="bold">{t`Data warehouse`}</Text>
+        {isLoading ? (
+          <Text>{t`Loading databases...`}</Text>
+        ) : (
+          <Select
+            data={databaseOptions}
+            value={databaseId?.toString() ?? ""}
+            onChange={handleDatabaseChange}
+            placeholder={t`Select a database`}
+            disabled={!isWorkspaceUninitialized(workspace)}
+            maw="20rem"
+          />
+        )}
+
+        <Text c="text-light" size="sm">
+          {t`Data warehouse selection is locked after adding transforms to the workspace`}
+        </Text>
+      </Stack>
+
+      {!isWorkspaceUninitialized(workspace) && (
+        <Stack gap="xs">
+          <Text fw="bold">{t`Setup log`}</Text>
+
+          <SetupLog
+            key={workspaceId} // avoid showing status of other workspaces (forces RTK query hook remount)
+            workspaceId={workspaceId}
+          />
+        </Stack>
+      )}
+    </Stack>
+  );
+};