This seems related: https://keen.canny.io/feature-requests/p/bulk-delete. We tried years ago to implement our own routine for cleaning up old data, but ran into trouble with the limits on deletes. Also, I recall someone telling me that deletions cause a re-index to occur and that becomes expensive for Keen's systems.

We would definitely use this. Setting an property on an individual event record would work well for us. Setting a TTL on an entire collection would also work. Thanks for considering this feature.