[BetterRed]

Originally Posted by itimpi

It will be at least 2^32, and may well be 2^64 - I cannot remember off-hand which it is.

If calibre uses SQLite2 and book.id is an INTEGER PRIMARY KEY then I think its maximum value is 2,147,483,647 = see https://www.sqlite.org/datatypes.html

A 2 billion book calibre library - nuh, not in all our lifetimes laid end to end

BR