Forwarded RabbitMQ Message Envelope

All client messages are published in this body format:

{
  "action": "string",
  "data": {}
}

Header / Properties Model

Field	Type	Source	Description
headers.timestamp	string	generated in publisher	Unix epoch in milliseconds as string.
headers.msg_type	int	set per Forwarder method	Message category id used by consumers.
correlation_id	string | null	optional, propagated from handler context when provided	Correlates downstream processing.
content_type	string	constant	Always application/json.
delivery_mode	int	constant	Persistent message delivery.
expiration	int	constant	44000 ms TTL.

Notes

• f_id is not a fixed header field; it is inside data when present in action payload.
• Queue selection is action-dependent (prematch_queue vs live_queue).