优化支付日志和配置删除提示

backend/internal/modules/paymentconfig/query.go

@@ -66,6 +66,9 @@ func (r *Repository) List(ctx context.Context, query ListQuery) ([]ConfigDTO, in
 	if err := r.applySuccessfulPaymentStats(ctx, dtos); err != nil {
 		return nil, 0, err
 	}
+	if err := r.applyReferenceCounts(ctx, dtos); err != nil {
+		return nil, 0, err
+	}
 
 	return dtos, total, nil
 }
@@ -87,6 +90,9 @@ func (r *Repository) FindByID(ctx context.Context, id uint64, includeSecret bool
 	if err := r.applySuccessfulPaymentStats(ctx, statDTOs); err != nil {
 		return nil, err
 	}
+	if err := r.applyReferenceCounts(ctx, statDTOs); err != nil {
+		return nil, err
+	}
 	dto = statDTOs[0]
 	if includeSecret {
 		if err := appendAuditLog(r.db.WithContext(ctx), actorID, "payment_config.view_secret", item.ID, meta, map[string]any{
@@ -145,6 +151,29 @@ func (r *Repository) applySuccessfulPaymentStats(ctx context.Context, dtos []Con
 	return nil
 }
 
+// applyReferenceCounts 使用删除保护的同一口径统计配置被支付记录引用的次数。
+func (r *Repository) applyReferenceCounts(ctx context.Context, dtos []ConfigDTO) error {
+	for idx := range dtos {
+		count, err := r.referenceCount(ctx, dtos[idx])
+		if err != nil {
+			return err
+		}
+		dtos[idx].ReferenceCount = count
+	}
+	return nil
+}
+
+func (r *Repository) referenceCount(ctx context.Context, dto ConfigDTO) (int64, error) {
+	var count int64
+	db := r.db.WithContext(ctx).Model(&model.PaymentOrder{}).
+		Where("payment_config_id = ?", dto.ID).
+		Or("(payment_config_id = ? OR payment_config_id IS NULL) AND provider = ? AND merchant_id = ? AND pay_way = ?", 0, dto.Provider, dto.MerchantID, dto.PayWay)
+	if err := db.Count(&count).Error; err != nil {
+		return 0, err
+	}
+	return count, nil
+}
+
 type nullableTime struct {
 	Time *time.Time
 }