Ghost_Kitchen/docs/adr/0002-order-items-are-independent.md

# Order Items are independent, not the Order

Preparation, queuing, pickup, and cancellation are all tracked per Order Item, not per Order. An Order is just a bundle that is "complete" once every Order Item in it has been picked up — but each Order Item cooks on its own Machine, becomes ready on its own, gets notified and picked up on its own, and can be cancelled on its own (locked only once its own first Preparation Step starts). We chose this over treating the Order as the atomic unit because items in the same order can have very different cook times (a pizza vs. a burger); forcing them to stay in lockstep would mean a finished item goes cold waiting on a slower one, or a customer loses the ability to cancel a not-yet-started item just because a sibling item already started cooking.
	`# Order Items are independent, not the Order`

	Preparation, queuing, pickup, and cancellation are all tracked per Order Item, not per Order. An Order is just a bundle that is "complete" once every Order Item in it has been picked up — but each Order Item cooks on its own Machine, becomes ready on its own, gets notified and picked up on its own, and can be cancelled on its own (locked only once its own first Preparation Step starts). We chose this over treating the Order as the atomic unit because items in the same order can have very different cook times (a pizza vs. a burger); forcing them to stay in lockstep would mean a finished item goes cold waiting on a slower one, or a customer loses the ability to cancel a not-yet-started item just because a sibling item already started cooking.