fix is_read

internal/repository/letter_outgoing_repository.go

@@ -540,8 +540,15 @@ func (r *LetterOutgoingRecipientRepository) GetByLetterIDsAndUser(ctx context.Co
 
 	db := DBFromContext(ctx, r.db)
 	var recipients []entities.LetterOutgoingRecipient
+
 	if err := db.WithContext(ctx).
-		Where("letter_id IN ? AND user_id = ?", letterIDs, userID).
+		Where(`id IN (
+           SELECT id FROM (
+               SELECT id, ROW_NUMBER() OVER (PARTITION BY letter_id ORDER BY created_at DESC) as rn
+               FROM letter_outgoing_recipients 
+               WHERE letter_id IN ? AND user_id = ?
+           ) t WHERE rn = 1
+       )`, letterIDs, userID).
 		Find(&recipients).Error; err != nil {
 		return nil, err
 	}

internal/repository/letter_repository.go

@@ -890,8 +890,15 @@ func (r *LetterIncomingRecipientRepository) GetByLetterIDsAndUser(ctx context.Co
 
 	db := DBFromContext(ctx, r.db)
 	var recipients []entities.LetterIncomingRecipient
+
 	if err := db.WithContext(ctx).
-		Where("letter_id IN ? AND recipient_user_id = ?", letterIDs, userID).
+		Where(`id IN (
+           SELECT id FROM (
+               SELECT id, ROW_NUMBER() OVER (PARTITION BY letter_id ORDER BY created_at DESC) as rn
+               FROM letter_incoming_recipients 
+               WHERE letter_id IN ? AND recipient_user_id = ?
+           ) t WHERE rn = 1
+       )`, letterIDs, userID).
 		Find(&recipients).Error; err != nil {
 		return nil, err
 	}