Add embedded PGlite support as zero-config database option

Add @electric-sql/pglite so the server can run without an external
Postgres instance. When DATABASE_URL is not set, the server auto-creates
an embedded PGlite database in ./data/pglite with schema push on startup.

- Add createPgliteDb() alongside the existing createDb()
- Make DATABASE_URL optional in server config
- Update drizzle config to glob schema files
- Update migrate script to support both Postgres and PGlite
- Add data/ to .gitignore for local PGlite storage

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/db/src/client.ts

@@ -1,10 +1,26 @@
-import { drizzle } from "drizzle-orm/postgres-js";
+import { mkdirSync } from "node:fs";
+import { drizzle as drizzlePg } from "drizzle-orm/postgres-js";
+import { drizzle as drizzlePglite } from "drizzle-orm/pglite";
 import postgres from "postgres";
+import { PGlite } from "@electric-sql/pglite";
 import * as schema from "./schema/index.js";
 
 export function createDb(url: string) {
   const sql = postgres(url);
-  return drizzle(sql, { schema });
+  return drizzlePg(sql, { schema });
+}
+
+export async function createPgliteDb(dataDir: string) {
+  mkdirSync(dataDir, { recursive: true });
+  const client = new PGlite(dataDir);
+  const db = drizzlePglite({ client, schema });
+
+  // Auto-push schema to PGlite on startup (like drizzle-kit push)
+  const { pushSchema } = await import("drizzle-kit/api");
+  const { apply } = await pushSchema(schema, db as any);
+  await apply();
+
+  return db;
 }
 
 export type Db = ReturnType<typeof createDb>;

packages/db/src/index.ts

@@ -1,2 +1,2 @@
-export { createDb, type Db } from "./client.js";
+export { createDb, createPgliteDb, type Db } from "./client.js";
 export * from "./schema/index.js";

packages/db/src/migrate.ts

@@ -1,13 +1,23 @@
-import { migrate } from "drizzle-orm/postgres-js/migrator";
+import { migrate as migratePg } from "drizzle-orm/postgres-js/migrator";
+import { migrate as migratePglite } from "drizzle-orm/pglite/migrator";
 import postgres from "postgres";
-import { drizzle } from "drizzle-orm/postgres-js";
+import { PGlite } from "@electric-sql/pglite";
+import { drizzle as drizzlePg } from "drizzle-orm/postgres-js";
+import { drizzle as drizzlePglite } from "drizzle-orm/pglite";
 
+const migrationsFolder = new URL("./migrations", import.meta.url).pathname;
 const url = process.env.DATABASE_URL;
-if (!url) throw new Error("DATABASE_URL is required");
 
-const sql = postgres(url, { max: 1 });
-const db = drizzle(sql);
+if (url) {
+  const sql = postgres(url, { max: 1 });
+  const db = drizzlePg(sql);
+  await migratePg(db, { migrationsFolder });
+  await sql.end();
+} else {
+  const client = new PGlite("./data/pglite");
+  const db = drizzlePglite({ client });
+  await migratePglite(db, { migrationsFolder });
+  await client.close();
+}
 
-await migrate(db, { migrationsFolder: new URL("./migrations", import.meta.url).pathname });
-await sql.end();
 console.log("Migrations complete");

packages/db/src/migrations/meta/_journal.json

@@ -0,0 +1 @@
+{"version":"7","dialect":"postgresql","entries":[]}