fix(client): Allow setting read receipts on backfilled events

src/api/client/read_marker.rs

@@ -1,7 +1,7 @@
 use std::collections::BTreeMap;
 
 use axum::extract::State;
-use conduwuit::{Err, PduCount, Result, err};
+use conduwuit::{Err, Result, err};
 use ruma::{
 	MilliSecondsSinceUnixEpoch,
 	api::client::{read_marker::set_read_marker, receipt::create_receipt},
@@ -94,11 +94,7 @@ pub(crate) async fn set_read_marker_route(
 			.await
 			.map_err(|_| err!(Request(NotFound("Event not found."))))?;
 
-		let PduCount::Normal(count) = count else {
-			return Err!(Request(InvalidParam(
-				"Event is a backfilled PDU and cannot be marked as read."
-			)));
-		};
+		let count = count.into_unsigned();
 
 		services
 			.rooms
@@ -192,11 +188,7 @@ pub(crate) async fn create_receipt_route(
 				.await
 				.map_err(|_| err!(Request(NotFound("Event not found."))))?;
 
-			let PduCount::Normal(count) = count else {
-				return Err!(Request(InvalidParam(
-					"Event is a backfilled PDU and cannot be marked as read."
-				)));
-			};
+			let count = count.into_unsigned();
 
 			services
 				.rooms

src/service/rooms/read_receipt/mod.rs

@@ -93,7 +93,7 @@ impl Service {
 		});
 
 		let (pdu_count, shortroomid) = try_join!(pdu_count, shortroomid)?;
-		let shorteventid = PduCount::Normal(pdu_count);
+		let shorteventid = PduCount::from_unsigned(pdu_count);
 		let pdu_id: RawPduId = PduId { shortroomid, shorteventid }.into();
 		let pdu = self.services.timeline.get_pdu_from_id(&pdu_id).await?;
 
@@ -101,8 +101,7 @@ impl Service {
 		let user_id: OwnedUserId = user_id.to_owned();
 
 		let mut receipt = ruma::events::receipt::Receipt::default();
-		// TODO: start storing the timestamp so we can return one
-		receipt.ts = None;
+		receipt.ts = Some(pdu.origin_server_ts());
 		receipt.thread = ruma::events::receipt::ReceiptThread::Unthreaded;
 
 		let content: BTreeMap<OwnedEventId, Receipts> = BTreeMap::from_iter([(