Questions about file location, orphaned local files

[phette23]

Sorry if this isn't the appropriate way to ask these but I wanted to clarify a few things.

When a tuple in mdl_tool_objectfs_objects has location = -2 that means a file with a matching contenthash does not exist in the mdl_files table but does in remote storage, correct? And if we have set deleteexternal to "Delete external file on orphan clean-up" then these files should be delete from object storage the next time the delete_orphaned_object_metadata task runs?

Secondly, we have a gradually growing "Delta (filedir - objectfs)" / "Filedir" which accounts for most of the disk space utilized by our filedir volume, as I set sizethreshold to be quite small (2560). Are these files that are stored locally in our filedir but which have contenthashes in neither mdl_tool_objectfs_objects nor mdl_files? How do they get there? The plugin doesn't clean them up? I'm wondering if I have to write a script to remove files in our filedir which have no matching contenthashes periodically.