fix: persist message delivery status across server restarts

app/messages/repository.py

@@ -180,6 +180,11 @@ async def create_message_receipt(
     return receipt
 
 
+async def list_chat_receipts(db: AsyncSession, *, chat_id: int) -> list[MessageReceipt]:
+    result = await db.execute(select(MessageReceipt).where(MessageReceipt.chat_id == chat_id))
+    return list(result.scalars().all())
+
+
 async def get_message_reaction(db: AsyncSession, *, message_id: int, user_id: int) -> MessageReaction | None:
     result = await db.execute(
         select(MessageReaction)