ReadonlySTATE_Capacity Interval is currently active (start_time <= now < end_time).
ReadonlySTATE_Capacity Interval is fully in the past (end_time <= now).
ReadonlySTATE_Capacity Interval is fully in the future (now < start_time).
ReadonlySTATE_Shouldn't happen.
Defines the static values of CapacityIntervalStatus_State.