Represents a binding between an internal room and an external platform room.
Constraints:
- Unique: {channel, bridge_id, external_room_id} - one internal room per external bridge
- Non-unique: room_id - one internal room can have many external bindings
Direction
The :direction field controls message flow:
:both(default) - Messages flow in both directions:inbound- Only receive messages from external platform:outbound- Only send messages to external platform