Thread: How Do I Refresh Calibre ID Numbers?
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Old 02-09-2014, 04:09 PM   #9
BetterRed
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- as well as the integer book id, I think calibre also assigns a UUID to each book, which is written as a ID in the opf that is embedded into EPUBs at least - you can see the value if you press 'I' on a book

Just out of curiosity what is it for?

BR
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