Quote:
Originally Posted by Jerome0840
so it just keeps increasing and never decrease?
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Yes. Calibre uses an SQLite database. I believe (but haven't checked the code) that the number is from a column with autoincrement set. If I'm right, every time a record (ie book) is added, that column's value will be one greater than the previous value used. Deletions won't affect it.
Ultimately, though, it doesn't matter. The files and folders in the library folder are part of the database. Just ignore them, same as you ignore the SQLite database file itself.