The Redis cleaner uses `KEYS`

[itamarhaber]

I recommend against using this tool in production... at all costs.

[mauro-oto]

@itamarhaber yes, you're not supposed to use database_cleaner in environments other than test. The README states that the gem should be inside your test group, not in development or production.

[mauro-oto]

Also, there are now safeguards against running in production as introduced here: #521