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That works when metadata.db is corrupted and cant be opened, and continues to work to this day.
Once you start modifying metadata.db outside of calibre you can do pretty much anything including changing data and those changes will propagate to the distributed backups, leading to the above mentioned total data loss. Simply *never* modify metadata.db outside of calibre. metadata.db is *internal to calibre*. And calibre has *never* been robust against users messing with metadata.db directly and never will be.
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