Using the Purge Remote Media API, we can send a POST request to delete all cached remote media before a certain time:

Your account must be a server admin for this command to work.

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curl -X POST -H "Authorization: Bearer $ADMIN_ACCESS_TOKEN" "https://matrix.org/_synapse/admin/v1/purge_media_cache?before_ts=1672527600000"

before_ts takes time in UNIX epoch milliseconds, the one in the template is at 2023-01-01 00:00. You can generate one [here] (https://currentmillis.com/)z

Generating an access token

If you don’t have an access token, you can also generate one using curl:

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curl -XPOST \
  -d '{"type":"m.login.password", "user":"<userid>", "password":"<password>"}' \
  "https://matrix.org/_matrix/client/r0/login"

Sources

https://matrix-org.github.io/synapse/latest/admin_api/media_admin_api.html#purge-remote-media-api Bing AI.