You use a global db atom in re-frame for global state, but there's nothing stopping you from using a reagent atom local to a component, is there?
I never thought of the existence of the global db as the thing that ALL state should go in., or is that a community best practice?
Edit: after digging through the re-frame docs themselves, you can see here that local reagent atoms are used for local state even with the global app db: https://github.com/day8/re-frame/blob/69a3fcd411369fff65404e...