Note that books that have had an author or title change since the last backup will be 'lost' if you restore the database. Reason: author and title are used to construct the folder path for the book. When you change one of them, the folders are moved to the new names. Restoring a metadata.db with the old author/title metadata will look in the old (and now non-existent) folder. Result: books are gone.
This was the reason I decided not to do an automatic backup of metadata.db when you do a search/replace. If you were playing with authors or titles, restoring the old copy could make the problem much much worse. I didn't want to imply a promise we couldn't keep.
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