Message retention problem

Hello. I asked this question on #synapse:matrix.org, but noone answered me. So I try my luck here.

We are runing Synapse server and have some problem with message retention.

When we are trying to set m.room.retention event with empty content it still deletes messages like it is using previous m.room.retention event.

So. To be clear.

1. Send m.room.retention event with max_lifetime = 60000 Messeges do not show after 1 min
2. Send m.room.retention event with max_lifetime = 86400000 As purge_jobs did not work, we see messages that wasnt seen in step 1.
3. Repeat step 1 - messages deleted
4. try to send m.room.retention event with empty content expectation: I can see messages what wasn deleted by purge_jobs yet reality: Can not see messages. They are still removed 1 min after.
5. Repeat step 2 - see that messages still there.

So what am i doing wrong? maybe there are some options in configurations need to be set?

And then we are sending m.room.retention event with empty content it is not saved in room_retention table in db. But It is saved in event_json table.

[richvdh]

note that message retention is an experimental feature - if it works at all, you’re lucky, and it’s not something we can really support.

At a guess though: you’re sending the m.room.retention event as a regular event rather than a state event.

[richvdh]

closing this due to lack of info.