Schedule
Records when the owner of the entry's partition next looks at it: when the entry is still at revision, the one the owner read, it is scheduled at (epoch milliseconds, ParkedAggregate.NEVER for an entry that is not retried automatically). So a claim, a repark or an operator's change made since the owner read the entry is never covered by a schedule computed before it.
Fields may be added: construct one with of; the constructor is internal to Wow.