feat: implement graceful shutdown handling

src/lib/DrizzleClient.ts

@@ -4,6 +4,10 @@ import * as schema from "@db/schema";
 import { env } from "@lib/env";
 
 const connectionString = env.DATABASE_URL;
-const postgres = new SQL(connectionString);
+export const postgres = new SQL(connectionString);
 
-export const DrizzleClient = drizzle(postgres, { schema });
+export const DrizzleClient = drizzle(postgres, { schema });
+
+export const closeDatabase = async () => {
+    await postgres.close();
+};