Caused by d854bf6b. Banning an artist would deadlock because it was
performed in a transaction, which didn't work with the `parallel_each`
inside the "create an implication to banned_artist" step.
Caused by d854bf6b. Banning an artist would deadlock because it was
performed in a transaction, which didn't work with the `parallel_each`
inside the "create an implication to banned_artist" step.