fix(db): no default sqlite dumped

Former-commit-id: 763198a34f09cfecc6d768b0b6eb28a29e1bf288

cpp/src/db/db_connection.cpp

@@ -24,7 +24,7 @@ SqliteDBPtr connect() {
     return temp;
 }
 
-SqliteDBPtr Connection::connect_ = connect();
+/* SqliteDBPtr Connection::connect_ = connect(); */
 
 }
 }