It seems to be an issue where ImageMagick filled up the drive, which in turn killed the database. After freeing the space, the database has now an inconsistent state and throws errors. It also looks like the db backups are corrupt. For whatever reason I’m still able to use this account through the Sync app.
I have these information from their matrix room https://matrix.io/#/#feddit:tilde.fun
As wgbirne already said, the admin has more important real life stuff to do unfortunately. If I understood it correctly, the lack of storage also killed the database, leaving it in an inconsistent state. In addition to that there seems to be an issue with the backups so no easy rollback and probably a lot of manual fixing needed.