update letter outgoing final attachment

internal/repository/letter_outgoing_repository.go

@@ -534,6 +534,60 @@ func (r *LetterOutgoingAttachmentRepository) ListByLetterIDs(ctx context.Context
 	return result, nil
 }
 
+type LetterOutgoingFinalAttachmentRepository struct{ db *gorm.DB }
+
+func NewLetterOutgoingFinalAttachmentRepository(db *gorm.DB) *LetterOutgoingFinalAttachmentRepository {
+	return &LetterOutgoingFinalAttachmentRepository{db: db}
+}
+
+func (r *LetterOutgoingFinalAttachmentRepository) Create(ctx context.Context, e *entities.LetterOutgoingFinalAttachment) error {
+	db := DBFromContext(ctx, r.db)
+	return db.WithContext(ctx).Create(e).Error
+}
+
+func (r *LetterOutgoingFinalAttachmentRepository) CreateBulk(ctx context.Context, list []entities.LetterOutgoingFinalAttachment) error {
+	db := DBFromContext(ctx, r.db)
+	if len(list) == 0 {
+		return nil
+	}
+	return db.WithContext(ctx).Create(&list).Error
+}
+
+func (r *LetterOutgoingFinalAttachmentRepository) ListByLetter(ctx context.Context, letterID uuid.UUID) ([]entities.LetterOutgoingFinalAttachment, error) {
+	db := DBFromContext(ctx, r.db)
+	var list []entities.LetterOutgoingFinalAttachment
+	if err := db.WithContext(ctx).Where("letter_id = ?", letterID).Order("uploaded_at ASC").Find(&list).Error; err != nil {
+		return nil, err
+	}
+	return list, nil
+}
+
+func (r *LetterOutgoingFinalAttachmentRepository) Delete(ctx context.Context, id uuid.UUID) error {
+	db := DBFromContext(ctx, r.db)
+	return db.WithContext(ctx).Where("id = ?", id).Delete(&entities.LetterOutgoingAttachment{}).Error
+}
+
+// ListByLetterIDs fetches attachments for multiple letters in a single query
+func (r *LetterOutgoingFinalAttachmentRepository) ListByLetterIDs(ctx context.Context, letterIDs []uuid.UUID) (map[uuid.UUID][]entities.LetterOutgoingFinalAttachment, error) {
+	if len(letterIDs) == 0 {
+		return make(map[uuid.UUID][]entities.LetterOutgoingFinalAttachment), nil
+	}
+
+	db := DBFromContext(ctx, r.db)
+	var attachments []entities.LetterOutgoingFinalAttachment
+	if err := db.WithContext(ctx).Where("letter_id IN ?", letterIDs).Order("uploaded_at ASC").Find(&attachments).Error; err != nil {
+		return nil, err
+	}
+
+	// Group attachments by letter ID
+	result := make(map[uuid.UUID][]entities.LetterOutgoingFinalAttachment)
+	for _, att := range attachments {
+		result[att.LetterID] = append(result[att.LetterID], att)
+	}
+
+	return result, nil
+}
+
 type LetterOutgoingRecipientRepository struct{ db *gorm.DB }
 
 func NewLetterOutgoingRecipientRepository(db *gorm.DB) *LetterOutgoingRecipientRepository {