feat: track image search links and preserve manual overrides (#279)

server/app/goauto/models/schema.go

@@ -417,7 +417,8 @@ type ShopeeProduct struct {
 	// PDDProductID stays nullable and must NOT be unique: one Shopee product maps
 	// to at most one PDD product, but several Shopee products may share the same
 	// PDD product.
-	PDDProductID *uint64 `json:"pddProductId" gorm:"index"`
+	PDDProductID      *uint64 `json:"pddProductId" gorm:"index"`
+	ImageSearchLinked bool    `json:"imageSearchLinked" gorm:"not null;default:false;index"`
 	// ImageURL holds the SYB-provided reference image URL. It is written by the
 	// #41 import and may be overridden manually; the product domain never joins
 	// syb_products at read time.

server/app/goauto/shopeeproduct/service.go

@@ -303,7 +303,7 @@ func (service *Service) LinkPDD(ctx context.Context, id uint64, request LinkPDDR
 		return SaveResponse{}, err
 	}
 	result := db.Model(&models.ShopeeProduct{}).Where("id = ?", id).Updates(map[string]any{
-		"pdd_product_id": request.PDDProductID, "last_update_request_id": request.RequestID,
+		"pdd_product_id": request.PDDProductID, "image_search_linked": false, "last_update_request_id": request.RequestID,
 	})
 	if result.Error != nil {
 		return SaveResponse{}, internalError(result.Error)

server/cmd/migrate/migration/version-local/1789400100000_image_search_link_marker.go

@@ -0,0 +1,25 @@
+package version_local
+
+import (
+	"runtime"
+
+	goautomigrations "go-admin/app/goauto/migrations"
+	"go-admin/cmd/migrate/migration"
+	common "go-admin/common/models"
+	"gorm.io/gorm"
+)
+
+func init() {
+	_, fileName, _, _ := runtime.Caller(0)
+	migration.Migrate.SetVersion(migration.GetFilename(fileName), migrateImageSearchLinkMarker)
+}
+
+// #279 stores whether the current Shopee→PDD link was created by image search.
+func migrateImageSearchLinkMarker(db *gorm.DB, version string) error {
+	return db.Transaction(func(tx *gorm.DB) error {
+		if err := goautomigrations.Migrate(tx); err != nil {
+			return err
+		}
+		return tx.Create(&common.Migration{Version: version}).Error
+	})
+}