added media fixes, search, push updates, pwa, metrics. preparing release 1.0

2026-09-27 23:26:15 +03:00
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+# ADR 0002: In-memory WebSocket hub
+
+- Status: accepted
+- Date: 2026-09
+
+## Context
+Realtime delivery (messages, typing, presence, read receipts) must reach
+connected clients immediately. Options: external broker (Redis pub/sub,
+NATS), Postgres LISTEN/NOTIFY, or an in-process hub.
+
+## Decision
+Use an in-process hub: `map[userID] -> connections` plus
+`map[conversationID] -> subscribers`, guarded by a mutex. Membership and
+read-state are resolved through a `MembershipProvider` interface implemented
+by the store.
+
+## Consequences
+- Sub-millisecond fan-out, no extra moving parts.
+- Presence checks (`IsOnline`) are lock-free reads used by the push notifier.
+- Multi-node scaling would require a broker; the hub's publish methods are
+  the seam where that would plug in.