Delete participations of long inactive users #3939

Job	Run time
Formatting	1m 34s
Formatting	1m 34s
Linter	2m 14s
Linter	2m 14s
Backup process	3m 4s
Backup process	3m 4s
Build wheel	1m 48s
Build wheel	1m 48s
Build nix environment on MacOS	4m 22s
Build nix environment on MacOS	4m 22s
MyPy	1m 43s
MyPy	1m 43s
Test + Coverage	2m 54s
Test + Coverage	2m 54s
Test Frontend	3m 10s
Test Frontend	3m 10s
Test (shuffled order)	2m 29s
Test (shuffled order)	2m 29s
Test if testdata is up to date	1m 58s
Test if testdata is up to date	1m 58s
Test Typescript	1m 38s
Test Typescript	1m 38s
Install wheel with system Python	10s
Install wheel with system Python	15s
	54m 13s

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