Originally Posted by PeterT
The other drawback to a reset is that the corrupt data (in my case at least) came ON a sync from Kobo; shelves were restored to me that I had dropped a long time ago; this was apparent from looking in the database at the time stamps on the rows in the shelves table.
Exactly. When I could delete them, they reappeared with every sync.
You have dates with yours? Interestingly enough, my offending shelves are missing the "created on" date.