Resolve "Celery backend_cleanup task fails due to foreign key constraint"

Closes #843 (closed)

added type::bug label

added 102 commits

• 58e8dbb8...c4354c13 - 92 earlier commits
• 88fa7287 - Fix system status page in SPA
• ff3470df - Merge branch...
• 0f9a3c28 - Merge branch '842-remove-vue_dummy' into 'release-3.0'
• fc0d5d42 - Merge branch 'release-3.0' into...
• 6f2d6890 - Merge branch...
• f9ef79d6 - Mark dynamic routes as hidden when the respective object registering them is deleted
• 2e9446c0 - Merge branch 'release-3.0' into...
• ff43ec6e - Merge branch...
• 1efa4e17 - Fix displaying of django messages
• c7dd3ca5 - Merge branch '811-fix-displaying-of-messages-in-vue-frontend' into 'release-3.0'

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added 1 commit

• bbc5b47a - Update version of django-celery-results

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changed target branch from master to release-3.0

assigned to @hansegucker

added 7 commits

• bbc5b47a...3b3875d2 - 6 commits from branch release-3.0
• 7692fe94 - Merge branch 'release-3.0' into...

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marked this merge request as ready

mentioned in commit d5948f66

merged