Garbage Collection

Inactive queries (no subscribers) are automatically garbage-collected after their cache-time-ms expires. This uses per-query timers, following the same model as TanStack Query and RTK Query:

1. Component unmounts → query marked inactive → setTimeout starts with cache-time-ms
2. Component remounts before timer fires → timer is cancelled, query stays in cache
3. Timer fires → query removed from app-db (only if still inactive)

Config	Default	Description
:cache-time-ms	300000 (5 min)	Time before inactive query is GC'd
:stale-time-ms	none	Time before data is considered stale

Timer handles are stored in a side-channel atom (not in app-db) to keep the re-frame store fully serializable.