public static function deleteByProductId($id_product)
 {
     if (Db::getInstance()->execute('DELETE FROM `' . _DB_PREFIX_ . 'custom_price` WHERE `id_product` = ' . (int) $id_product)) {
         // Refresh cache of feature detachable
         Configuration::updateGlobalValue('PS_SPECIFIC_PRICE_FEATURE_ACTIVE', AphCustomPrice::isCurrentlyUsed('custom_price'));
         return true;
     }
     return false;
 }