perf: Strip unsigned over federation and generate it on the fly locally

src/api/client/message.rs

@@ -140,7 +140,17 @@ pub(crate) async fn get_message_events_route(
 		.wide_filter_map(|item| visibility_filter(&services, item, sender_user))
 		.take(limit)
 		.then(async |mut pdu| {
-			pdu.1.set_unsigned(Some(sender_user));
+			let ctx = services
+				.rooms
+				.timeline
+				.get_unsigned_context(&pdu.1, Some(sender_user))
+				.await;
+			pdu.1.set_unsigned(
+				ctx.user_id,
+				ctx.membership,
+				ctx.prev_content,
+				ctx.redacted_because,
+			);
 			if let Err(e) = services
 				.rooms
 				.pdu_metadata