Quote:
Originally Posted by Manichean
I think what he's trying to say is that if you overwrite your (assumedly broken) metadata.db with an older one, and in the meantime had changed some author names or titles, which Calibre would have mirrored in the folder structure, then the older, working metadata.db would point to nonexisting folders while, at the same time, you'd have nonreferenced folders in your library. Sorting out which is which might be decidedly non-trivial if you've changed a lot of things. Thus, making things even worse.
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I notices browsing the Metadata.DB contents (yes I peeked

), that Authors also get a non-reused (renaming an author gets a new number) index number.

If Calibre were to use this number, similar to that used for numbering title file names, finding "orphans" should now become a rather trivial (Not in list) operation