Errors in nextcloud

These errors, did you already have them with NC 25 or any other version between 25 and 30, or did it just start at NC 30?

Between the versions, a few indices were added to different tables. You can use the occ command to add them:

Worst case, if that is the only problem left, you can try to add the column manually:

If you do things manually, don’t forget to do a full backup.