Room deletion (fixes #43)

src/service/rooms/read_receipt/mod.rs

@@ -145,6 +145,10 @@ impl Service {
 			.last_privateread_update(user_id, room_id)
 			.await
 	}
+
+	pub async fn delete_all_read_receipts(&self, room_id: &RoomId) -> Result {
+		self.db.delete_all_read_receipts(room_id).await
+	}
 }
 
 #[must_use]