Use Drizzle adapter and Drizzle CLI auth migrations

lib/server/db/index.ts

@@ -0,0 +1,41 @@
+import { drizzle } from 'drizzle-orm/node-postgres';
+import { Pool } from 'pg';
+import { authSchema } from './schema';
+
+type AuthDrizzleDb = ReturnType<typeof createDb>;
+
+declare global {
+  // eslint-disable-next-line no-var
+  var __fiscalAuthPgPool: Pool | undefined;
+  // eslint-disable-next-line no-var
+  var __fiscalAuthDrizzleDb: AuthDrizzleDb | undefined;
+}
+
+function getConnectionString() {
+  const connectionString = process.env.DATABASE_URL?.trim();
+  if (!connectionString) {
+    throw new Error('DATABASE_URL is required for PostgreSQL.');
+  }
+
+  return connectionString;
+}
+
+export function getPool() {
+  if (!globalThis.__fiscalAuthPgPool) {
+    globalThis.__fiscalAuthPgPool = new Pool({
+      connectionString: getConnectionString()
+    });
+  }
+
+  return globalThis.__fiscalAuthPgPool;
+}
+
+function createDb() {
+  return drizzle(getPool(), { schema: authSchema });
+}
+
+export const db = globalThis.__fiscalAuthDrizzleDb ?? createDb();
+
+if (!globalThis.__fiscalAuthDrizzleDb) {
+  globalThis.__fiscalAuthDrizzleDb = db;
+}