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Responding to your first point - when you add a book to the Calibre library it uses its own naming scheme for the stored books, and you cannot change this. You should treat books that have been imported into the calibre library as calibres own private database. The number is actually the internal database ID that the book is stored against in the calibre metadata database. The number is used to allow possible duplicates to be handled correctly. If you try and rename the books Calibre will no longer be able to find them.
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