Hello. I just uploaded some new books to the Calibre directory on the COPS server, but I'm having trouble getting COPS to update the index. Even if I move the Calibre directory out of the way, the list of books is still the same as it was, so the index seems to be cached somewhere. Is there a file I would need to delete to make COPS recreate the index? (In case it matters, the Calibre directory is mounted from another machine over NFS).