I am leveraging the new auto purge settings to remove device event history. All devices is currently set to 100 across my 4 hubs. But this said, it is not removing all history and I have some event history from prior to enabling this feature and dates vary depending on how old the hub is. My zigbee hub for example has some history for one device dating back to 06/06/2019.
Seems there is an issue with the auto purge @gopher.ny