Rooms

persistent: stays open until explicitly closed (but hard_ttl still enforced as safety net)

idle_close: closes after idle_ttl seconds with no members or messages

hard_deadline: absolute lifetime cap

Seconds without activity before room closes (idle_close mode). Resets on any publish.

Absolute lifetime cap. Enforced even on persistent rooms (safety net). Default 6 hours.

Maximum concurrent subscribers. For massive broadcast channels, use approximate counts.

Number of last messages replayed on subscribe (stored in Redis list, TTL = room TTL). 0 = disabled.