ScheduledValue::TimespanDrop
A range of time. Both "start" and "finish" are optional; omitting either of them will lead to an infinite-length timespan.
Fields
finish (ActiveSupport::TimeWithZone)
The end of the timespan (or null if it has no end)
start (ActiveSupport::TimeWithZone)
The start of the timespan (or null if it has no start)