优化后台高频查询性能

backend/internal/jobs/refundretry/job_test.go

@@ -21,7 +21,7 @@ func setupRefundRetryTestDB(t *testing.T) *gorm.DB {
 	if err != nil {
 		t.Fatalf("创建测试数据库失败: %v", err)
 	}
-	if err := db.AutoMigrate(&model.PaymentOrder{}, &model.RentalOrder{}); err != nil {
+	if err := db.AutoMigrate(&model.PaymentOrder{}, &model.RentalOrder{}, &model.ChatConversation{}); err != nil {
 		t.Fatalf("数据库迁移失败: %v", err)
 	}
 	return db
@@ -165,19 +165,19 @@ func TestResetRetryClearsRetryFields(t *testing.T) {
 func createArbitrationOrphanFixture(t *testing.T, db *gorm.DB, suffix string, settlementStatus string) model.RentalOrder {
 	t.Helper()
 	order := model.RentalOrder{
-		OrderNo:            "ORD" + suffix,
-		ListingID:          1,
-		AccountID:          1,
-		OwnerID:            1,
-		RenterID:           2,
-		RentAmountCent:     1000,
-		DepositAmountCent:  500,
-		Status:             "closed",
-		HandoffStatus:      "arbitrated",
-		SettlementStatus:   settlementStatus,
-		RefundStatus:       "pending",
-		RefundAmountCent:   800,
-		UpdatedAt:          time.Now().Add(-20 * time.Minute), // 超过 10min 静默窗口
+		OrderNo:           "ORD" + suffix,
+		ListingID:         1,
+		AccountID:         1,
+		OwnerID:           1,
+		RenterID:          2,
+		RentAmountCent:    1000,
+		DepositAmountCent: 500,
+		Status:            "closed",
+		HandoffStatus:     "arbitrated",
+		SettlementStatus:  settlementStatus,
+		RefundStatus:      "pending",
+		RefundAmountCent:  800,
+		UpdatedAt:         time.Now().Add(-20 * time.Minute), // 超过 10min 静默窗口
 	}
 	if err := db.Create(&order).Error; err != nil {
 		t.Fatalf("create order failed: %v", err)