Is there a way to delete events before a certain release?

I am getting new instances of an issue - and a lot of duplicates. Is there any way from the Sentry web page to delete old events or events before a certain date or release? I see the trashcan icon, but that says “delete and discard future events”. I want to “delete old events” but start accumulating future events of this type. These are all data errors but the duplicate occurrences are making it tedious to hunt through them.

Alternately, there is discussion of an API. Is there a way to query events for an issue and group them by the url? (I am using the Django / Python / raven SDK)