retainNewest abstract method
Keeps the count newest entries in store order (LogCursor), removes the
rest and sends their ids as LogEntriesRemovedById to changes, or
LogStoreInvalidated if the ids are not cheaply known: the application's
count limit, store.retainNewest(50000). A store may also remove entries
on its own (a size limit), reporting them the same way.
Implementation
Future<void> retainNewest(int count);