public function purgeAllProfiles()
    {
        $table = Mage::getResourceModel('sheep_debug/requestInfo')->getMainTable();
        $deleteSql = "DELETE FROM {$table}";

        /** @var Magento_Db_Adapter_Pdo_Mysql $connection */
        $connection = Mage::getSingleton('core/resource')->getConnection('core_write');

        /** @var Varien_Db_Statement_Pdo_Mysql $result */
        $result = $connection->query($deleteSql);

        return $result->rowCount();
    }