add bookmarks proposal

proposals/2766-bookmarks.md

@@ -0,0 +1,46 @@
+# MSC2766: Message Bookmarks
+
+Matrix is currently lacking a feature to bookmark events as a user to provide a way of easy finding
+important messages without needing to know a search term.
+
+Note: This is not the same as Element's message pinning feature.
+
+## Proposal
+
+Bookmarks are selected by a User on a Event. This means a user can select a event and add it to the bookmarks.
+The bookmark event inside of the account data is used for clients to keep track of bookmarked events.
+
+The bookmarks are saved with the type `dev.nordgedanken.bookmarks` (later: `m.bookmarks`).
+
+It is being saved inside of the rooms account data
+
+```json
+{
+  "events": [
+    "$12345:example.com",
+    "$67890:example.com"
+  ]
+}
+```
+
+## Alternatives
+
+Instead of using the room account data it would be possible to save this in the global account data.
+This would be similiar to `m.direct`.
+
+The events are grouped by the room id to allow easier filtering of bookmarks based on rooms.
+
+```json
+{
+  "!12345:example.com": [
+    "$67890:example.com"
+  ],
+  "!67890:example.com": [
+    "$12345:example.com"
+  ]
+}
+```
+
+## Potential issues
+
+* With the alternative version we might hit the 64k limit sooner.