It would be best to look. You can start Task Manager as Administrator to look for unexpected Duplicati processes. From there or Start menu, Resource Monitor as Administrator CPU tab:
I have to say actions taken were confusing. It sounded like recreate was for configured DBs:
GUI delete and recreate would leave them at the same paths, so where were failed deletes?
Another odd thing is that Duplicati-server.sqlite is often held open, but idle job DB usually isn’t.
Regardless, looking around at the time might have found something, but problem is now gone.