eikek f4a2b86ea8 Use a minimum age of items to remove
In order to keep deleted items for a while, the periodic task can now
use a duration to only remove items with a certain age. This can be
used to ensure that a deleted item stays at least X days before it
will be removed from the database.

Refs: #347
2021-08-15 12:32:50 +02:00
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