fix: lazy-init DB client to avoid build-time connection failure

Author: HeZeBang

src/server/db/index.ts

@@ -2,10 +2,25 @@ import postgres from "postgres";
 import { drizzle } from "drizzle-orm/postgres-js";
 import * as schema from "./schema";
 
-const queryClient = postgres(process.env.DATABASE_URL!, {
-  max: 10,
-  idle_timeout: 20,
-  connect_timeout: 10,
-});
+let _db: ReturnType<typeof drizzle> | null = null;
+
+export function getDb() {
+  if (!_db) {
+    const queryClient = postgres(process.env.DATABASE_URL!, {
+      max: 10,
+      idle_timeout: 20,
+      connect_timeout: 10,
+    });
+    _db = drizzle(queryClient, { schema });
+  }
+  return _db;
+}
 
-export const db = drizzle(queryClient, { schema });
+// Backward-compatible `db` getter
+export const db = new Proxy({} as ReturnType<typeof drizzle>, {
+  get(_target, prop, receiver) {
+    const real = getDb();
+    const val = Reflect.get(real, prop, receiver);
+    return typeof val === "function" ? val.bind(real) : val;
+  },
+});