separate read and write db in prune() #75
Merged
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fixes #72, alternative to #73.
This PR takes care that the write transaction of prune() is as short-lived as possible. It avoids touching the db.py complexity, as I don't fully understand the difference of transactions and connections and what @hpk42 had in mind when he wrote that (note that it was before mailcow times).
@link2xt what do you think?