debusine-server-delete-expired.service fails due to violated constraint for db_worker

This started 2 days ago.

This is the latest instance with a bit of context:

Dec 24 00:00:50 poseidon debusine-admin[3044929]: Deleted artifact 2683002
Dec 24 00:00:50 poseidon debusine-admin[3044929]: Deleted artifact 2683003
Dec 24 00:00:50 poseidon debusine-admin[3044929]: Deleted artifact 2683004
Dec 24 00:00:50 poseidon debusine-admin[3044929]: Deleted artifact 2683005
Dec 24 00:00:50 poseidon debusine-admin[3044929]: Deleted artifact 2683006
Dec 24 00:00:53 poseidon debusine-admin[3044929]: Lock timed out (5 seconds). Try again.
Dec 24 00:00:53 poseidon debusine-admin[3044929]: CommandError: Database error: new row for relation "db_worker" violates check constraint "db_worker_celery_or_token"
Dec 24 00:00:53 poseidon debusine-admin[3044929]: DETAIL:  Failing row contains (8263, ec2-amd64-008, 2025-12-21 15:19:29.393519+00, null, {}, {}, null, null, 1, external, null, 3, {}, null).
Dec 24 00:00:53 poseidon debusine-admin[3044929]: Deleted artifact 2683007
Dec 24 00:00:53 poseidon debusine-admin[3044929]: Deleted artifact 2683008
Dec 24 00:00:53 poseidon debusine-admin[3044929]: Deleted artifact 2683009
Dec 24 00:00:53 poseidon debusine-admin[3044929]: Deleted artifact 2683010

And there are all instances:

Dec 22 00:00:58 poseidon debusine-admin[123754]: CommandError: Database error: new row for relation "db_worker" violates check constraint "db_worker_celery_or_token"
Dec 23 00:03:19 poseidon debusine-admin[1415732]: CommandError: Database error: new row for relation "db_worker" violates check constraint "db_worker_celery_or_token"
Dec 23 16:07:40 poseidon debusine-admin[2382139]: CommandError: Database error: new row for relation "db_worker" violates check constraint "db_worker_celery_or_token"
Dec 24 00:00:53 poseidon debusine-admin[3044929]: CommandError: Database error: new row for relation "db_worker" violates check constraint "db_worker_celery_or_token"