Import Orders Into Dispatch Plan

Add up to 22,000 orders per request to the plan's unplanned backlog. Orders the plan already holds are reported as unchanged, so a retry is safe. The whole selection is refused when any id is unknown or ineligible (400 PLAN_SELECTION_INVALID, naming the ids) or another plan holds one of its orders (409 ORDER_HELD_BY_PLAN). More ids than one request takes fail with 422 VALIDATION_ERRORS. A plan holds at most 22,000 orders, 1,500 routes and 24,000 stops; an import that would grow it past them is refused with 400 PLAN_DOCUMENT_INVALID. Fails with 409 PLAN_LEASE_HELD (naming heldBy) while anyone has the plan open in the Planner, and with 409 PLAN_REVISION_STALE (naming currentRevision) when the plan changed since expectedRevision.