add sku mapping

backend/migrations/2026_04_14_100000_extend_skus_mapping_table.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+use Hyperf\Database\Schema\Schema;
+use Hyperf\Database\Schema\Blueprint;
+use Hyperf\Database\Migrations\Migration;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('skus_mapping', function (Blueprint $table) {
+            $table->bigInteger('origin_sku_id')->nullable()->comment('关联 skus_origin.id（FK）');
+            $table->text('platform_outer_sku')->nullable()->comment('平台侧使用的 SKU 编码');
+            $table->text('generation_strategy')->nullable()->comment('生成策略记录，如 prefix:C03、prefix_random:C03:4、manual');
+
+            $table->index(['company_id', 'origin_sku_id', 'platform_id'], 'idx_company_origin_platform');
+            $table->index(['platform_outer_sku', 'platform_id'], 'idx_outer_sku_platform');
+
+            $table->foreign('origin_sku_id')
+                ->references('id')
+                ->on('skus_origin')
+                ->onDelete('restrict')
+                ->onUpdate('cascade');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('skus_mapping', function (Blueprint $table) {
+            $table->dropForeign(['origin_sku_id']);
+            $table->dropIndex('idx_company_origin_platform');
+            $table->dropIndex('idx_outer_sku_platform');
+            $table->dropColumn(['origin_sku_id', 'platform_outer_sku', 'generation_strategy']);
+        });
+    }
+};