Deletes locally cached copies of remote media last accessed before the given millisecond timestamp, freeing disk space on federated servers. If a user later requests purged media, Synapse re-fetches it from the origin server. before_ts is a Unix timestamp in milliseconds, for example 1735689600000 is 2025-01-01. Combine with size_gt-style filters on the media delete endpoint for local files.
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