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Calibre CAN rebuild the DB fairly quickly if nothing else was corrupted .
Every folder contains a Metadata.opf. That is the metadata that was in the Library at the time each entry was last updated.
You will see an entry: Metadata backup status
That is how many entries are still in the queue (usually the queue empties fast, except when you do something that affect a large number of books).
That is what is used If you right click the Library icon:Library Maintenance: Restore database.
This ASSUMES the rest of the Library files are intact (This is why a NAS/networked drive is dangerous and not to be used. Delays can cause pieces to be out of place/lost. )
Each Library (DB) is ONLY associated with the folders in the same Tree branch. Corrupt 'books' and your 'Comics' library was not involved.
THIS does not apply to a Hardware / Malware caused fail.
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