优化支付日志和配置删除提示

backend/internal/modules/paymentconfig/dto.go

@@ -46,6 +46,7 @@ type ConfigDTO struct {
 	Status            string         `json:"status"`
 	Environment       string         `json:"environment"`
 	BusinessTags      []string       `json:"business_tags"`
+	ReferenceCount    int64          `json:"reference_count"`
 	TotalTransactions int64          `json:"total_transactions"`
 	TotalAmountCent   int64          `json:"total_amount_cent"`
 	LastUsedAt        *string        `json:"last_used_at"`

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
 }

backend/internal/modules/paymentconfig/repository_test.go

@@ -121,6 +121,20 @@ func TestListUsesSuccessfulPaymentStats(t *testing.T) {
 			BizType:         "order_pay",
 			Status:          "closed",
 		},
+		{
+			PaymentNo:       "PAY-LEGACY",
+			OrderID:         3,
+			OrderNo:         "ORD-LEGACY",
+			UserID:          2,
+			PaymentConfigID: 0,
+			Provider:        "lakala",
+			MerchantID:      "M1",
+			ThirdOrderID:    "PAY-LEGACY",
+			PayWay:          "WXZF",
+			AmountCent:      10130,
+			BizType:         "order_pay",
+			Status:          "failed",
+		},
 	}
 	if err := db.Create(&payments).Error; err != nil {
 		t.Fatalf("create payments failed: %v", err)
@@ -137,6 +151,9 @@ func TestListUsesSuccessfulPaymentStats(t *testing.T) {
 	if items[0].TotalTransactions != 1 || items[0].TotalAmountCent != 10130 {
 		t.Fatalf("success stats = %d/%d, want 1/10130", items[0].TotalTransactions, items[0].TotalAmountCent)
 	}
+	if items[0].ReferenceCount != 3 {
+		t.Fatalf("reference_count = %d, want 3", items[0].ReferenceCount)
+	}
 	if items[0].LastUsedAt == nil {
 		t.Fatal("last success pay time should not be nil")
 	}