$ hydra-ctl collections prefix dea agency
1 decision(s) are filed under dea: ids; the new prefix would orphan them.
Run again with --rekey to rewrite them. Nothing changed.

$ hydra-ctl collections prefix dea agency --rekey
Changed dea's prefix: dea -> agency (1 decision rewritten)
Rebuilt breakingbad: 244 records, 226 entities, 33 open questions
1 of 1 rewritten decisions found their rows