@xxx in this particular case -
There is an issue either within the media itself, within the device Roon is installed on, or a situation where RAM or the PC is failing, or even that the database refresh wasn’t refreshed properly. The “something is wrong with the database” message is Roon detecting corruption. It does seem that this edge case issue has bypassed Roons guard allowing for a corrupted backup, so you’re in the right direction with that.
@Andreas_Heinze I’ll be on standby for your status update, and if you’re able to load a fresh database with your corrected files. 