set_overdrive is location-wide; overdrive_applied and target_supply_setpoint are per-circuit °C values.{
"circuit_id": 42,
"set_overdrive": -2,
"effective_from": "2026-06-08T06:00:00.000Z",
"overdrive_applied": -2,
"target_supply_setpoint": 53.3,
"applied": true,
"reason": "pending",
"can_apply_overdrive": true,
"observed_at": "2026-06-08T09:19:31.000Z"
}