[sieabahlpark]

Redis is a memory store, you're the one who fucked up treating a cache as a persistence layer.

[itake]

Redis offers disk persistence [0]. Why can't it be used as a persistence layer?

[0] - https://redis.io/docs/management/persistence/

[ceejayoz]

Redis offers disk persistence; Heroku's free Redis offering did not.

[robertlagrant]

You can use Redis as a cache, but it's not fundamentally a cache.