Message seen not uniquely identify

[pradeepkumar24rk]

markAsSeen before update in database in sender have in messageList
{
"senderId": "6704ed7d43c7900df7e97ee0",
"receiverId": "65b9ddc3c1512617e0d0bc0e",
"isSeen": false,
"message": "test 20",
"createdAt": "2024-10-23T11:08:49.962Z"
}
in receiver side have

{
"_id": "6718d9418409919c69056649",
"senderId": "6704ed7d43c7900df7e97ee0",
"receiverId": "65b9ddc3c1512617e0d0bc0e",
"roomId": "65b9ddc3c1512617e0d0bc0e_6704ed7d43c7900df7e97ee0",
"message": "test 20",
"isSeen": false,
"createdAt": "2024-10-23T11:08:49.967Z",
"updatedAt": "2024-10-23T11:08:49.967Z",
"__v": 0
}
when the receiver seen the message it send the {
"_id": "6718d9418409919c69056649",
"senderId": "6704ed7d43c7900df7e97ee0",
"receiverId": "65b9ddc3c1512617e0d0bc0e",
"roomId": "65b9ddc3c1512617e0d0bc0e_6704ed7d43c7900df7e97ee0",
"message": "test 20",
"isSeen": false,
"createdAt": "2024-10-23T11:08:49.967Z",
"updatedAt": "2024-10-23T11:08:49.967Z",
"__v": 0
} this message to sender. Then how to sender messageList that message has seen.