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Matthew Hodgson
c159933058
Two new caches serve the room hierarchy (space summary) endpoints without touching the database once warm: * get_room_hierarchy_state (state store): the room's authoritative join rule and history visibility, the join-rules state id (for the restricted-allow computation) and the stripped m.space.child events. Invalidated whenever a state event is persisted in the room (and on room purge), including over replication. * get_room_with_stats (room store) is now @cached, invalidated where the room stats rows are written (update_room_state and the room stats delta), when the room's directory visibility changes, and on purge. The handler serves local room entries from these caches; accessibility checks use the cached authoritative join rule / history visibility plus the existing per-user cached membership lookups, so a warm request for a public hierarchy does no DB work. Partial-state and unknown rooms fall back to the uncached path. Join rule and history visibility for access decisions are read from current state, not the stats copies, so access control never rides a stale asynchronously-updated stats row. Remote rooms were already TTL-cached by the federation client (5 minutes); change-based invalidation is not possible across federation. Ties in child ordering beyond origin_server_ts now break on the child room id (per MSC2946) rather than the previously arbitrary input order.