Trouble rebuilding database

After having used the 8.1 container for a while docker reported it being unhealthy, this led to the container freeze and remaining unusable. Luckily I had a backup from the 8.0 aio mastercontainer and could use that. My files luckily reside on a separate vm and are still there, but when I try to rescan for files that we’re uploaded since that last backup (about a month ago), the php request seems to freeze… (its been like this for atleast 15 hours now)
any suggestions on how to get more information why? the rest of nextcloud still seems to work.

note: I migrated hence my username is still ncp

update 1: running the command verbose shows that it gets stuck on a certain folder, it does not tell why however…