-# gpx_files_timestamp_idx (timestamp)
-# gpx_files_user_id_idx (user_id)
-# gpx_files_visible_visibility_idx (visible,visibility)
+# gpx_files_timestamp_idx (timestamp)
+# gpx_files_user_id_idx (user_id)
+# gpx_files_visible_visibility_idx (visible,visibility)
+# index_gpx_files_on_user_id_and_id (user_id,id)