remove variant type id (enum) from variants table, use internal id for category field on variants form

src/Model/Entity/ProductCategoryVariant.php

@@ -3,6 +3,7 @@ declare(strict_types=1);
 
 namespace CakeProducts\Model\Entity;
 
+use Cake\Datasource\EntityInterface;
 use Cake\ORM\Entity;
 
 /**
@@ -12,11 +13,10 @@ use Cake\ORM\Entity;
  * @property string $name
  * @property string|null $product_category_id
  * @property string|null $product_id
- * @property int $variant_type_id
  * @property bool $enabled
  *
- * @property \App\Model\Entity\ProductCategory $product_category
- * @property \App\Model\Entity\Product $product
+ * @property ProductCategory|EntityInterface $product_category
+ * @property Product|EntityInterface $product
  */
 class ProductCategoryVariant extends Entity
 {
@@ -33,9 +33,9 @@ class ProductCategoryVariant extends Entity
         'name' => true,
         'product_category_id' => true,
         'product_id' => true,
-        'variant_type_id' => true,
         'enabled' => true,
-        'product_category' => true,
-        'product' => true,
+        // entities
+        'product_category' => false,
+        'product' => false,
     ];
 }