Presence is planned as a Redis key with a TTL refreshed by the SSE heartbeat, which reports stream-open rather than actively-viewing.
Why it is open
Presence is planned as a Redis key with a TTL refreshed by the SSE heartbeat.
This reports "has an open stream", not "is looking at this chat", and a client
killed between heartbeats stays online until expiry.
Revisit trigger
The demo needing per-chat presence or accurate last-seen.
Presence is planned as a Redis key with a TTL refreshed by the SSE heartbeat, which reports stream-open rather than actively-viewing.
Why it is open
Presence is planned as a Redis key with a TTL refreshed by the SSE heartbeat.
This reports "has an open stream", not "is looking at this chat", and a client
killed between heartbeats stays online until expiry.
Revisit trigger
The demo needing per-chat presence or accurate last-seen.