new: add channel management

database/migrations/shop/2025_03_06_000001_add_default_sale_channel_id_to_shop_customers_table.php

@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up()
+    {
+        Schema::table('shop_customers', function (Blueprint $table) {
+            if (! Schema::hasColumn('shop_customers', 'default_sale_channel_id')) {
+                $table->unsignedInteger('default_sale_channel_id')->nullable()->after('settings');
+                $table->index('default_sale_channel_id', 'shop_customers_default_sale_channel_id_index');
+            }
+        });
+    }
+
+    public function down()
+    {
+        Schema::table('shop_customers', function (Blueprint $table) {
+            if (Schema::hasColumn('shop_customers', 'default_sale_channel_id')) {
+                $table->dropIndex('shop_customers_default_sale_channel_id_index');
+                $table->dropColumn('default_sale_channel_id');
+            }
+        });
+    }
+};