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The main sell of redis is the flexibility, if you take that away then why use redis over something that treats schemas as a first class citizen?

Absolutely no way am I going down that route when there are databases with schemas available.

Which in-memory database did you use?

Postgres + lots of RAM. In memory database is fine until you have to recover a 20 gig AOF.

We use H2 in production for a non-critical small app. If it goes down we just launch it again and it fetches data from other internal webapps.

I'd not recommend it for heavy-use in Production.