feat(app-host): switch Vercel deployment from InMemoryDriver to TursoDriver

Replace @objectstack/driver-memory with @objectstack/driver-turso in the
app-host example. On Vercel, the driver connects to Turso cloud via
TURSO_DATABASE_URL and TURSO_AUTH_TOKEN env vars (remote mode). For local
development without those variables, it falls back to :memory: (ephemeral
SQLite).

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>
Agent-Logs-Url: https://github.com/objectstack-ai/spec/sessions/1190de98-61cc-419b-b502-b9728e8e3db8

Author: Copilot

CHANGELOG.md

@@ -7,6 +7,14 @@ 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.
+
 ### Added
 - **`@objectstack/driver-turso` — dual transport architecture** — TursoDriver now supports three
   transport modes: `local`, `replica`, and `remote`. Remote mode (`url: 'libsql://...'`) enables

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

examples/app-host/vercel.json

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