In the projects I've seen so far... for the replay use case (new read model) we/they do replay each event from the beginning.... => getEvents https://github.com/adrai/node-eventstore#query-your-events
and for occasionally missing events => getEventsByRevision
and only for edge cases when denormalizers where down for a longer time... they do get the "THE_LAST_EVENT_SEEN" containing an occurredAt field and use getEventsSince

Thanks for the fast reply... the last point is how I do it currently. However, I quite often had events that occurred at the same time (yes, exactly same time down to milliseconds). Guess I just augment my function so it ignores everything that comes before the last seen event ID.