feat(go): close the db;

main.go

@@ -62,6 +62,7 @@ func main() {
 	if servercfg.DeployedByOperator() && !servercfg.IsPro {
 		logic.SetFreeTierLimits()
 	}
+	defer db.CloseDB()
 	defer database.CloseDB()
 	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGTERM, os.Interrupt)
 	defer stop()