feat(appkit): add appkit db migrate

.gitignore

@@ -19,6 +19,9 @@ coverage
 
 .databricks
 
+# `appkit db` holds it while a command changes the migration history
+**/config/database/.appkit-db.lock
+
 .claude/scheduled_tasks.lock
 internal
 

.oxlintrc.json

@@ -58,6 +58,56 @@
       "rules": {
         "no-restricted-imports": "off"
       }
+    },
+    {
+      "files": ["packages/appkit/src/**"],
+      "rules": {
+        "no-restricted-imports": [
+          "error",
+          {
+            "patterns": [
+              {
+                "group": [
+                  "@databricks/sdk-experimental",
+                  "@databricks/sdk-experimental/**"
+                ],
+                "message": "Import the Databricks SDK only through the wrapper in packages/shared/src/workspace-client. Add a re-export there if you need a new symbol."
+              },
+              {
+                "group": ["drizzle-kit", "drizzle-kit/**"],
+                "message": "drizzle-kit is an optional dev dependency that deployed apps do not install. Only packages/appkit/src/database/tooling may import it."
+              },
+              {
+                "group": [
+                  "**/tooling",
+                  "**/tooling/**",
+                  "@databricks/appkit/beta/database-tooling"
+                ],
+                "message": "The database tooling may import drizzle-kit, so only the CLI loads it. Runtime code must not import it."
+              }
+            ]
+          }
+        ]
+      }
+    },
+    {
+      "files": ["packages/appkit/src/database/tooling/**"],
+      "rules": {
+        "no-restricted-imports": [
+          "error",
+          {
+            "patterns": [
+              {
+                "group": [
+                  "@databricks/sdk-experimental",
+                  "@databricks/sdk-experimental/**"
+                ],
+                "message": "Import the Databricks SDK only through the wrapper in packages/shared/src/workspace-client. Add a re-export there if you need a new symbol."
+              }
+            ]
+          }
+        ]
+      }
     }
   ],
   "ignorePatterns": [

bundle-size-baseline.json

@@ -3,25 +3,25 @@
     {
       "name": "@databricks/appkit",
       "tarball": {
-        "packed": 1297373,
-        "unpacked": 4453717
+        "packed": 1364290,
+        "unpacked": 4666959
       },
       "dist": {
         "total": {
-          "raw": 4438327,
-          "gzip": 1520942
+          "raw": 4651188,
+          "gzip": 1599394
         },
         "js": {
-          "raw": 1320443,
-          "gzip": 468638
+          "raw": 1391995,
+          "gzip": 496182
         },
         "types": {
-          "raw": 474763,
-          "gzip": 172113
+          "raw": 478827,
+          "gzip": 174184
         },
         "maps": {
-          "raw": 2632326,
-          "gzip": 876373
+          "raw": 2769571,
+          "gzip": 925210
         },
         "css": {
           "raw": 0,
@@ -31,22 +31,22 @@
           "raw": 10795,
           "gzip": 3818
         },
-        "fileCount": 895
+        "fileCount": 935
       },
       "entries": [
         {
           "id": ".",
           "gzip": 111090,
           "composition": {
-            "initialGzip": 108517,
-            "lazyGzip": 2573,
+            "initialGzip": 108516,
+            "lazyGzip": 2574,
             "totalGzip": 111090,
             "own": 351738,
             "nodeModules": null,
             "chunks": [
               {
                 "label": "index.js",
-                "gzip": 103847,
+                "gzip": 103846,
                 "kind": "initial"
               },
               {
@@ -56,25 +56,25 @@
               },
               {
                 "label": "remote-tunnel-manager.js",
-                "gzip": 2573,
+                "gzip": 2574,
                 "kind": "lazy"
               }
             ]
           }
         },
         {
           "id": "./beta",
-          "gzip": 105499,
+          "gzip": 110783,
           "composition": {
-            "initialGzip": 105014,
+            "initialGzip": 110298,
             "lazyGzip": 485,
-            "totalGzip": 105499,
-            "own": 316145,
+            "totalGzip": 110783,
+            "own": 331023,
             "nodeModules": null,
             "chunks": [
               {
                 "label": "beta.js",
-                "gzip": 84463,
+                "gzip": 89747,
                 "kind": "initial"
               },
               {
@@ -125,13 +125,31 @@
             ]
           }
         },
+        {
+          "id": "./beta/database-tooling",
+          "gzip": 28557,
+          "composition": {
+            "initialGzip": 28557,
+            "lazyGzip": 0,
+            "totalGzip": 28557,
+            "own": 84002,
+            "nodeModules": null,
+            "chunks": [
+              {
+                "label": "index.js",
+                "gzip": 28557,
+                "kind": "initial"
+              }
+            ]
+          }
+        },
         {
           "id": "./testing",
-          "gzip": 79051,
+          "gzip": 79050,
           "composition": {
-            "initialGzip": 45993,
-            "lazyGzip": 33058,
-            "totalGzip": 79051,
+            "initialGzip": 45995,
+            "lazyGzip": 33055,
+            "totalGzip": 79050,
             "own": 228781,
             "nodeModules": null,
             "chunks": [
@@ -142,7 +160,7 @@
               },
               {
                 "label": "index.js",
-                "gzip": 10286,
+                "gzip": 10288,
                 "kind": "initial"
               },
               {
@@ -152,12 +170,12 @@
               },
               {
                 "label": "index.js",
-                "gzip": 28625,
+                "gzip": 28624,
                 "kind": "lazy"
               },
               {
                 "label": "remote-tunnel-manager.js",
-                "gzip": 2587,
+                "gzip": 2585,
                 "kind": "lazy"
               },
               {
@@ -188,17 +206,17 @@
         },
         {
           "id": "./type-generator",
-          "gzip": 26634,
+          "gzip": 26635,
           "composition": {
-            "initialGzip": 26634,
+            "initialGzip": 26635,
             "lazyGzip": 0,
-            "totalGzip": 26634,
+            "totalGzip": 26635,
             "own": 76220,
             "nodeModules": null,
             "chunks": [
               {
                 "label": "index.js",
-                "gzip": 26634,
+                "gzip": 26635,
                 "kind": "initial"
               }
             ]

docs/docs/plugins/database.md

@@ -112,6 +112,63 @@ Migrations applied on start into `public` also need
 `GRANT CREATE ON SCHEMA public` to the app's service principal, because it does
 not own `public`.
 
+## Generate and apply migrations locally
+
+:::note
+`appkit db` is hidden from `appkit --help` while the database development flow is
+in beta. Its logic ships in `@databricks/appkit/beta/database-tooling`, which
+only the AppKit CLI of the same release imports. It has no semver guarantee.
+:::
+
+`npx appkit db migrate` compares `config/database/schema.ts` with the latest
+committed snapshot. When they differ, it writes
+`config/database/migrations/NNNN_migration.sql`. It regenerates
+`shared/appkit-types/database.d.ts`, then applies pending migrations to the
+branch `.env` names. Commit the migrations with `schema.ts`.
+
+`migrate` applies migrations only to your dev branch or to this checkout's
+session branch. A session branch name includes a hash of the user who created
+it, so a `.env` copied from another developer does not make their session branch
+yours.
+
+### Branches `databricks.yml` deploys to
+
+`migrate` never applies migrations to a branch that `databricks.yml` deploys to.
+It reads every target, every `postgres` resource of every app, the
+`postgres_branch` variable, and the files that `include:` names. It also reads
+the variable values `databricks bundle` keeps for a target in
+`.databricks/bundle/<target>/variable-overrides.json`. A branch named there
+counts as well as the one `databricks.yml` names, because a deploy from this
+checkout uses the file's value.
+
+If a branch or database reference has no value in those files, `migrate` cannot
+tell which branch the reference names. Examples are a target that leaves
+`postgres_branch` unset and `${workspace.current_user.short_name}`. While any such
+reference exists, `migrate` applies migrations to no branch. The message names
+the target and where the reference is. To continue, give the reference a value
+in `databricks.yml`, or in the `variable-overrides.json` the message names. A
+`variable-overrides.json` that is not a JSON object stops `migrate` too.
+
+The check reads only this checkout's files. It does not see values passed at
+deploy time with `--var` or `BUNDLE_VAR_*`, or resources defined in Python. It
+protects branches from the CLI, and does not replace Lakebase permissions or
+protected branches.
+
+### One command at a time
+
+While `migrate` runs, it holds `config/database/.appkit-db.lock`. A second
+`appkit db` command in the same checkout fails and names the process that holds
+the lock. The lock goes when the command finishes or exits.
+
+A command stopped by a signal, such as SIGKILL, can leave the file behind. The
+next command then names the holder. When that process no longer runs, the
+message says the holder stopped. When its pid runs on this machine, the message
+says to wait for it. A pid can also belong to an unrelated process, for example
+after a reboot reused it. In either case, if no `appkit db` command runs in the
+checkout, delete `config/database/.appkit-db.lock` and run the command again.
+AppKit never deletes a lock it does not hold. Scaffolded apps list the file in
+`.gitignore`.
+
 ## Schema discovery and overrides
 
 `database()` and `database({})` use the same defaults. During setup, the plugin

knip.json

@@ -38,7 +38,8 @@
         "@databricks/sdk-statementexecution",
         "@databricks/sdk-warehouses",
         "@mlflow/core",
-        "autoevals"
+        "autoevals",
+        "drizzle-kit"
       ]
     },
     "packages/appkit-ui": {

packages/appkit/package.json

@@ -42,6 +42,11 @@
       "development": "./src/type-generator/index.ts",
       "default": "./dist/type-generator/index.js"
     },
+    "./beta/database-tooling": {
+      "types": "./dist/database/tooling/index.d.ts",
+      "development": "./src/database/tooling/index.ts",
+      "default": "./dist/database/tooling/index.js"
+    },
     "./testing": {
       "types": "./dist/testing/index.d.ts",
       "development": "./src/testing/index.ts",
@@ -126,6 +131,7 @@
   "peerDependencies": {
     "@mlflow/core": "0.4.0",
     "autoevals": "0.3.0",
+    "drizzle-kit": "0.31.10",
     "vitest": ">=3"
   },
   "peerDependenciesMeta": {
@@ -135,6 +141,9 @@
     "autoevals": {
       "optional": true
     },
+    "drizzle-kit": {
+      "optional": true
+    },
     "vitest": {
       "optional": true
     }
@@ -149,6 +158,7 @@
     "@types/ws": "8.18.1",
     "@vitejs/plugin-react": "5.1.1",
     "autoevals": "0.3.0",
+    "drizzle-kit": "0.31.10",
     "vitest": "3.2.4"
   },
   "overrides": {
@@ -161,6 +171,7 @@
       "./beta": "./dist/beta.js",
       "./dist/shared/src/plugin": "./dist/shared/src/plugin.d.ts",
       "./type-generator": "./dist/type-generator/index.js",
+      "./beta/database-tooling": "./dist/database/tooling/index.js",
       "./testing": {
         "types": "./dist/testing/index.d.ts",
         "default": "./dist/testing/index.js"

packages/appkit/src/connectors/lakebase/endpoint-host.ts

@@ -145,7 +145,7 @@ async function compareHosts(
 }
 
 /** Read every host the endpoint serves, read-write and read-only. */
-function endpointHosts(response: unknown): string[] {
+export function endpointHosts(response: unknown): string[] {
   if (!response || typeof response !== "object") return [];
   const status = Reflect.get(response, "status");
   if (!status || typeof status !== "object") return [];