修复更新节点时并发导致的分配失败问题

actions/cities.go

@@ -20,7 +20,7 @@ func FindCitiesWithEdgesCount(tx *gorm.DB) ([]model.City, error) {
 		model.City
 		EdgesCount int `gorm:"column:edges_count"`
 	}
-	err := tx.Debug().
+	err := tx.
 		Select("cityhash.*, COUNT(edge.id) AS edges_count").
 		Joins("LEFT JOIN edge ON edge.city_id = cityhash.id").
 		Where("cityhash.label IS NOT NULL").