Note that the main Calibre program is NOT multi-user aware. If two people try and update the calibre database at the same time, they will trample on each others changes and may even corrupt the Calibre metadata database.
Work is under way to re-architect the Calibre database layer so that multiple clients can run against the same database. There is no ETA, however, for when this work will be completed. It is a non-trivial change that affects a lot of the Calibre internals.
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