diff --git a/backend/migrations/2025_11_13_068522_create_skus_mapping.php b/backend/migrations/2025_11_13_068522_create_skus_mapping.php
index b3e52ec..a547394 100644
--- a/backend/migrations/2025_11_13_068522_create_skus_mapping.php
+++ b/backend/migrations/2025_11_13_068522_create_skus_mapping.php
@@ -30,8 +30,9 @@ return new class extends Migration
             $table->text('note')->nullable()->default(null)->comment('备注信息');
             $table->timestampsTz();
 
-            // 创建联合唯一索引
-            $table->unique(['platform_id', 'platform_product_id', 'origin_sku'], 'uk_platform_product_origin');
+            // 创建联合唯一索引：确保同一平台的同一产品只能有一条映射记录
+            // 原始 SKU 的约束由业务侧实现
+            $table->unique(['platform_id', 'platform_product_id'], 'uk_platform_product');
         });
     }