feat(studio): switch Vercel serverless API from InMemoryDriver to TursoDriver

Replace @objectstack/driver-memory with @objectstack/driver-turso in
the Studio Vercel API entrypoint (apps/studio/api/index.ts). On Vercel,
the driver connects to Turso cloud via TURSO_DATABASE_URL and
TURSO_AUTH_TOKEN env vars (remote mode). Falls back to :memory: for
local dev. Revert incorrect app-host changes from previous commits.

The browser MSW mock kernel (createKernel.ts) remains unchanged —
InMemoryDriver is the correct choice for browser dev mode.

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
Agent-Logs-Url: https://github.com/objectstack-ai/spec/sessions/85c7bfe8-af37-430d-b5dd-b974be65ad32

Author: Copilot

CHANGELOG.md

@@ -8,12 +8,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Changed
-- **Vercel deployment — switched from InMemoryDriver to TursoDriver** — The `app-host` example now
-  uses `@objectstack/driver-turso` (TursoDriver) instead of `@objectstack/driver-memory`
-  (InMemoryDriver) for Vercel deployments. In production, the driver connects to a Turso cloud
-  database via `TURSO_DATABASE_URL` and `TURSO_AUTH_TOKEN` environment variables (remote mode).
-  For local development without those variables, it falls back to `:memory:` (ephemeral SQLite).
-  This ensures data persistence across serverless function invocations on Vercel.
+- **Studio Vercel deployment — switched from InMemoryDriver to TursoDriver** — The Studio serverless
+  API entrypoint (`apps/studio/api/index.ts`) now uses `@objectstack/driver-turso` (TursoDriver)
+  instead of `@objectstack/driver-memory` (InMemoryDriver) for Vercel deployments. In production,
+  the driver connects to a Turso cloud database via `TURSO_DATABASE_URL` and `TURSO_AUTH_TOKEN`
+  environment variables (remote mode). For local development without those variables, it falls back
+  to `:memory:` (ephemeral SQLite). This ensures data persistence across serverless function
+  invocations on Vercel. The browser MSW mock kernel remains unchanged (InMemoryDriver).
 
 ### Added
 - **`@objectstack/driver-turso` — dual transport architecture** — TursoDriver now supports three

apps/studio/api/index.ts

@@ -27,7 +27,7 @@
 
 import { ObjectKernel, DriverPlugin, AppPlugin } from '@objectstack/runtime';
 import { ObjectQLPlugin } from '@objectstack/objectql';
-import { InMemoryDriver } from '@objectstack/driver-memory';
+import { TursoDriver } from '@objectstack/driver-turso';
 import { createHonoApp } from '@objectstack/hono';
 import { AuthPlugin } from '@objectstack/plugin-auth';
 import { SecurityPlugin } from '@objectstack/plugin-security';
@@ -70,7 +70,10 @@ async function ensureKernel(): Promise<ObjectKernel> {
             const kernel = new ObjectKernel();
 
             await kernel.use(new ObjectQLPlugin());
-            await kernel.use(new DriverPlugin(new InMemoryDriver(), 'memory'));
+            await kernel.use(new DriverPlugin(new TursoDriver({
+                url: process.env.TURSO_DATABASE_URL ?? ':memory:',
+                ...(process.env.TURSO_AUTH_TOKEN && { authToken: process.env.TURSO_AUTH_TOKEN }),
+            }), 'turso'));
             await kernel.use(new AppPlugin(studioConfig));
 
             // Auth plugin — uses better-auth for real authentication

apps/studio/package.json

@@ -20,6 +20,7 @@
     "@objectstack/client": "workspace:*",
     "@objectstack/client-react": "workspace:*",
     "@objectstack/driver-memory": "workspace:*",
+    "@objectstack/driver-turso": "workspace:*",
     "@objectstack/hono": "workspace:*",
     "@objectstack/metadata": "workspace:*",
     "@objectstack/objectql": "workspace:*",

apps/studio/vercel.json

@@ -7,7 +7,9 @@
   "build": {
     "env": {
       "VITE_RUNTIME_MODE": "server",
-      "VITE_SERVER_URL": ""
+      "VITE_SERVER_URL": "",
+      "TURSO_DATABASE_URL": "@turso_database_url",
+      "TURSO_AUTH_TOKEN": "@turso_auth_token"
     }
   },
   "rewrites": [

examples/app-host/debug-registry.ts

@@ -3,7 +3,7 @@
 
 import { ObjectKernel, DriverPlugin, AppPlugin } from '@objectstack/runtime';
 import { SchemaRegistry, ObjectQL, ObjectQLPlugin } from '@objectstack/objectql';
-import { TursoDriver } from '@objectstack/driver-turso';
+import { InMemoryDriver } from '@objectstack/driver-memory';
 
 import TodoApp from '@example/app-todo/objectstack.config';
 
@@ -16,7 +16,7 @@ import TodoApp from '@example/app-todo/objectstack.config';
 
     kernel
         .use(new ObjectQLPlugin())
-        .use(new DriverPlugin(new TursoDriver({ url: ':memory:' }), 'turso'))
+        .use(new DriverPlugin(new InMemoryDriver(), 'memory'))
         .use(new AppPlugin(TodoApp));
 
     await kernel.bootstrap();

examples/app-host/objectstack.config.ts

@@ -3,7 +3,7 @@
 import { defineStack } from '@objectstack/spec';
 import { AppPlugin, DriverPlugin } from '@objectstack/runtime';
 import { ObjectQLPlugin } from '@objectstack/objectql';
-import { TursoDriver } from '@objectstack/driver-turso';
+import { InMemoryDriver } from '@objectstack/driver-memory';
 import { AuthPlugin } from '@objectstack/plugin-auth';
 import CrmApp from '../app-crm/objectstack.config';
 import TodoApp from '../app-todo/objectstack.config';
@@ -35,11 +35,8 @@ export default defineStack({
   // The Runtime CLI will iterate this list and call kernel.use()
   plugins: [
     new ObjectQLPlugin(),
-    // Register Default Driver (Turso — remote mode on Vercel, in-memory for local dev)
-    new DriverPlugin(new TursoDriver({
-      url: process.env.TURSO_DATABASE_URL ?? ':memory:',
-      ...(process.env.TURSO_AUTH_TOKEN && { authToken: process.env.TURSO_AUTH_TOKEN }),
-    })),
+    // Register Default Driver (Memory)
+    new DriverPlugin(new InMemoryDriver()),
     // Authentication — required for production (Vercel) deployments
     authPlugin,
     // Wrap Manifests/Stacks in AppPlugin adapter
@@ -104,10 +101,7 @@ export const PreviewHostExample = defineStack({
   // Same plugins as the standard host
   plugins: [
     new ObjectQLPlugin(),
-    new DriverPlugin(new TursoDriver({
-      url: process.env.TURSO_DATABASE_URL ?? ':memory:',
-      ...(process.env.TURSO_AUTH_TOKEN && { authToken: process.env.TURSO_AUTH_TOKEN }),
-    })),
+    new DriverPlugin(new InMemoryDriver()),
     authPlugin,
     new AppPlugin(CrmApp),
     new AppPlugin(TodoApp),

examples/app-host/package.json

@@ -13,7 +13,7 @@
     "clean": "rm -rf dist node_modules"
   },
   "dependencies": {
-    "@objectstack/driver-turso": "workspace:*",
+    "@objectstack/driver-memory": "workspace:*",
     "@example/app-crm": "workspace:*",
     "@example/app-todo": "workspace:*",
     "@objectstack/metadata": "workspace:*",

examples/app-host/vercel.json

@@ -5,8 +5,6 @@
   "outputDirectory": "dist",
   "env": {
     "AUTH_SECRET": "@auth_secret",
-    "VERCEL_URL": "@vercel_url",
-    "TURSO_DATABASE_URL": "@turso_database_url",
-    "TURSO_AUTH_TOKEN": "@turso_auth_token"
+    "VERCEL_URL": "@vercel_url"
   }
 }