This is an interesting problem. It seems like it would be pretty messy if I copied the Calibre_Library folder and imported it again. Hopefully we would not import the duplicates but since the import no longer has the metadata, I'm expecting lots of duplicates with poor matching.
What would happen on a database restore if I had first edited all the metadata.opf files to have unique values here:
<dc:identifier opf:scheme="calibre" id="calibre_id">2663</dc:identifier>
Is this the only place in the metadata where a database id would collide?
Thanks,
Alan
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