I should have been more specific--technically the cache would be wiped for a specific post, never for the entire db of posts. But you're totally right about the

I should have been more specific--technically the cache would be wiped for a specific post, never for the entire db of posts. But you're totally right about the persistence --that's why something like redis made sense to me. Useful tip about randomkey and del, thank you. I def. could switch it over to an incr/decr setup. Maybe I'll do that tonight.