We were baffled that some of the recent edits (via ArcMap 5.1 eith Roads and Highways extension) to an archive-enabled LRS feature class had not shown up in the FME-based ETL processes. It turned out that the edits went into the the archive H table instead. Could anyone tell us if this was a bug or user-error?
OK, we dug further and realized the H table represents the entirety of the event table. It was how archiving was supposed to work.