gist/matrix/retention/README.md

Room history retention settings / state event m.room.retention

• https://brendan.abolivier.bzh/matrix-retention-policies/

Read that, it explains what is actually done etc.

Notes

• Not part of spec. https://github.com/matrix-org/matrix-spec-proposals/pull/1763
• Matrix uses milliseconds, keep that in mind!
• Everything requires every server involved to have rention support enabled, otherwise the messages go nowhere and are fetchable upon request.
• 86400000 = 1 day (seen in min lifetimes)
• Helpful: https://unitchefs.com/milliseconds/days/ / https://unitchefs.com/days/milliseconds/