Refactor product relations to use new category_product and channel_product tables

- Updated queries and relationships in various controllers and models to replace `product_has_relations` with `category_product` and `channel_product`.
- Adjusted methods in `ProductFilterer`, `FilterParamsController`, and `FilterController` to reflect the new database structure.
- Modified seeder to insert data into the new `channel_product` table.
- Updated tests to ensure compatibility with the new product relation structure.

database/migrations/2026_02_09_001233_refactor_product_relationships.php

@@ -0,0 +1,61 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        // 1. Create new pivot tables
+        Schema::create('category_product', function (Blueprint $table) {
+            $table->foreignId('product_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('category_id')->constrained()->cascadeOnDelete();
+            // No primary key on pivot usually, but maybe composite unique?
+            // product_has_relations didn't have one explicitly shown but usually pivots do.
+            // Let's add an index for performance.
+            $table->unique(['product_id', 'category_id']);
+        });
+
+        Schema::create('collection_product', function (Blueprint $table) {
+            $table->foreignId('product_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('collection_id')->constrained()->cascadeOnDelete();
+            $table->unique(['product_id', 'collection_id']);
+        });
+
+        Schema::create('channel_product', function (Blueprint $table) {
+            $table->foreignId('product_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('channel_id')->constrained()->cascadeOnDelete();
+            $table->unique(['product_id', 'channel_id']);
+        });
+
+        Schema::create('product_related', function (Blueprint $table) {
+            $table->foreignId('product_id')->constrained()->cascadeOnDelete();
+            $table->foreignId('related_product_id')->constrained('products')->cascadeOnDelete();
+            $table->unique(['product_id', 'related_product_id']);
+        });
+
+        // 2. Migrate data
+        // Using raw SQL for efficiency and simplicity
+        DB::statement("INSERT INTO category_product (product_id, category_id) SELECT product_id, productable_id FROM product_has_relations WHERE productable_type = 'category'");
+        DB::statement("INSERT INTO collection_product (product_id, collection_id) SELECT product_id, productable_id FROM product_has_relations WHERE productable_type = 'collection'");
+        DB::statement("INSERT INTO channel_product (product_id, channel_id) SELECT product_id, productable_id FROM product_has_relations WHERE productable_type = 'channel'");
+        DB::statement("INSERT INTO product_related (product_id, related_product_id) SELECT product_id, productable_id FROM product_has_relations WHERE productable_type = 'product'");
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('category_product');
+        Schema::dropIfExists('collection_product');
+        Schema::dropIfExists('channel_product');
+        Schema::dropIfExists('product_related');
+    }
+};

database/seeders/new/ProductsTableSeeder.php

@@ -45,10 +45,9 @@ class ProductsTableSeeder extends Seeder
                 });
 
                 $channel = $user ? $user->channel() : tmpostChannel();
-                DB::table('product_has_relations')->insert([
+                DB::table('channel_product')->insert([
                     'product_id' => $data['id'],
-                    'productable_id' => $channel->id,
-                    'productable_type' => 'channel',
+                    'channel_id' => $channel->id,
                 ]);
             }