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--- en:howto:matrix:max_lifetime [2022/11/29 18:49] – gelöscht - Externe Bearbeitung (Unknown date) 127.0.0.1
+++ en:howto:matrix:max_lifetime [2026/01/05 14:55] (current) – Fix howto y
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+====== Change Matrix room retention time ======
+Systemli's Matrix home server instance has a default retention time of 30 days. We allow values from 1-180 days.
+<note important>Clients that have already downloaded and stored the event/message might continue to show it, unless they themselves implement support for message retention policies, the homeserver can not do anything about this.</note>
+----
+It is possible to send custom events from developer tools of element web and set room retention time there.
+  - The developer tools can be opened by typing ''/devtools'' in the message editor.
+  - In the devtools, select "Explore room state"
+  - If the retention has not previously set, `m.room.retention` will not show up in the overview
+  - Click "Send custom state event"
+    - You'll first need to convert the desired time in days to milliseconds, i.e.: 1000*60*60*24*<number_of_days>
+    - Event Type: <code>m.room.retention</code>
+    - Event Content: <code>
+{
+    "max_lifetime": 2592000000
+}</code>
+    - State Key: leave this empty
+    - Click "Send"
+After sending, you can verify that the retention is set: Go back and choose "Explore room state". Now ''m.room.retention'' should show up in the overview.
+----
+Source: https://github.com/vector-im/element-web/issues/3800#issuecomment-1030568445
+===== Further reading =====
+  * [[https://github.com/matrix-org/synapse/blob/develop/docs/message_retention_policies.md#room-configuration|Matrix Message retention policies]]
+  * [[https://spec.matrix.org/latest/|Matrix Client API documentation]]