Delay save_all_media_for_source while database tasks run

tubesync/sync/tasks.py

@@ -401,6 +401,11 @@ def index_source_task(source_id):
     wait_for_database_queue(
         verbose_name=_('Waiting for database tasks to complete'),
     )
+    wait_for_database_queue(
+        priority=29, # the checking task uses 30
+        queue=Val(TaskQueue.FS),
+        verbose_name=_('Delaying checking all media for database tasks'),
+    )
     delete_task_by_source('sync.tasks.save_all_media_for_source', source.pk)
     num_videos = len(videos)
     log.info(f'Found {num_videos} media items for source: {source}')