State machines

Postgres enums constrain the stored value. These maps constrain the edge.

Aggregate	Source	Page
Order	two identical files	Order state machine
Fulfillment	fulfillment-state-machine.ts	Fulfillment
Return	return-state-machine.ts	Returns
Purchase order	purchase-order-state-machine.ts	Procurement
Goods receipt	goods-receipt-state-machine.ts	Procurement
Channel	schema comment plus circuit breaker	Channels
Outbox	dispatcher	Async processing

Order and return helpers return true when the current status is null. Fulfillment does not. Shipment status was not copied into a single map on this page. It is applied in shipment services and courier webhooks.