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

src/api/client/room/event.rs

@@ -58,7 +58,12 @@ pub(crate) async fn get_room_event_route(
 		debug_warn!("Failed to add bundled aggregations to event: {e}");
 	}
 
-	event.set_unsigned(Some(body.identity.expect_sender_user()?));
+	let ctx = services
+		.rooms
+		.timeline
+		.get_unsigned_context(&event, Some(sender_user))
+		.await;
+	event.set_unsigned(ctx.user_id, ctx.membership, ctx.prev_content, ctx.redacted_because);
 
 	Ok(get_room_event::v3::Response::new(event.into_format()))
 }

src/api/client/room/initial_sync.rs

@@ -53,7 +53,17 @@ pub(crate) async fn room_initial_sync_route(
 		.pdus_rev(room_id, None)
 		.try_take(limit)
 		.and_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