@witek this was discussed here I think last week. Someone came in with the same idea and I was skeptical about the value gained. After brainstorming a bit we couldn't really come up with scenarios where you'd gain value from using re-frame's model on the server. It is designed for the client, after all.

One big hurdle is that you want to avoid stateful services

You did mention in-memory database though, it could make more sense in that case

I think that core.async should (easily) be used to solve any kind of a "data flow" problem in server-side.

Well maybe except for that subscription part.