L3 - Default Description
As part of event processing to store event traces and sequence counts, we need to maintain a record of the ingestion timestamp of the most recently processed event in order to page through events. We currently store this in memory, so the timestamp is lost on restart and we need to process all events ever ingested to get back to where it was when it was left off. We should instead persist this last ingested timestamp so that we can resume from where we left off after restart. See discussion and original PR: https://github.com/camunda/camunda-optimize/pull/1369#discussion_r354862470