Merge branch 'delete_orphaned_activities' into develop

diff --cc CHANGELOG.md
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--- 2/CHANGELOG.md
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@@@ -9,9 -9,9 +9,12 @@@ The format is based on [Keep a Changelo
  ## Fixed
  - Allowed contentMap to be updated on edit
  
 +### Changed
 +- Restoring the database from a dump now goes much faster without need for work-arounds
 +
+ ### Added
+ - Extend the mix task `prune_objects` with option `--prune-orphaned-activities` to also prune orphaned activities, allowing to reclaim even more database space
+ 
  ## 2023.02
  
  ### Added