Change a live deployment's schedule in place: interval, delay, properties, twins, version, or re-pin imageId. The record keeps its id, release and sha — only the schedule is rewritten. Read-only fields (status, steps, sha, release, ...) may be present with their current values, so a GET body can be PUT back unchanged, but changing one is a 400. Edge targets are supported: send twins as {twin, target, deviceId} to move one between cloud and edge, and the side it left is cleaned up. Refused while pending or deploying.