You can write a sql query to find the profile pictures not in use. Take a look at the answer here, it may be of help.
That way I find the current picture, but I am looking for the no longer used ones.
If a user changes it’s profile picture, the previous one remains in the avatar list next to the current picture.
I found this in the database under attachments, but I think simple deleting the entry and the file isn’t a good idea, since there seem to be any further dependance.
So the topic should better be “How to delete previous user pictures?” :-)
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