Originally Posted by kiwidude
@jackie_w - don't forget that calibre book id is not unique across libraries...
is that really a showstopper?
you are saying that i may send some book covers from library a, then switch library & send some more from library B with a risk of some overwriting?
well I for one could live with that. calibre already supports moving books from library A to B or vice verse, with or without deletion, so it's easy to work around if needed.
but better, find out how calibre does uniquely identify a book on the device & use that key in the cover name