Paul suggested the following. These seem not required, as they can be accomplished without specific convience operations and therefore not minimal.

PATCH /operator/permanent-device(opid,did,cid) – to associate a device with a consumer 1-1 for all time
PATCH /operator/temporary-device(opid,did,cid,time-period) – to associate a device with a consumer for a time period (e.g. a wristband). Atoms received outside this time period are ignored / quarantined
PATCH /operator/shared-device(opid,did,cid) – to associate a device with a consumer, in addition to other consumers it is already associated with.