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For what it's worth, a SQLite data base can have up to 4,294,967,294 (2^32-2) pages with a maximum page size of 65536 bytes. Unless you happen to have a couple of spare 256TB (counting in 1024s, disk manufacturers love counting in 1000s so ~281TB) disks kicking around, you are likely to run out of disk space to store your ebooks long before calibre runs out of available entries in it's database.
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