Merge commit '525efab61' into anoa/dinsic_release_1_21_x

* commit '525efab61':
  1.20.0rc1
  Systemd docs: configure workers to start after main process. (#8276)
  Only add rows to the push actions table if the event notifies or should be marked unread (#8274)
  Avoid table-scanning users at startup (#8271)
  Fix unread count failing on NULL values (#8270)
  Add more logging to debug slow startup (#8264)
  Refuse to upgrade database on worker processes (#8266)

Author: anoadragon453