static function get_query_data($id)
 {
     $result = new stdClass();
     $result->labels = Database::get_labels_of_user($id);
     $result->label_list_attachments = Database::get_label_list_attachments_of_user($id);
     $result->lists = Database::get_query_lists_of_user($id);
     return $result;
 }