public function deleteDuplicates()
    {
        $cron_schedule = Mage::getSingleton('core/resource')->getTableName('cron_schedule');
        $conn = Mage::getSingleton('core/resource')->getConnection('core_read');

        // TODO: Direct sql is not nice. We can do better... :)
        $results = $conn->fetchAll("
			SELECT
				GROUP_CONCAT(schedule_id) AS ids,
				CONCAT(job_code, scheduled_at) AS jobkey,
				count(*) AS qty
			FROM {$cron_schedule}
			WHERE status = '" . Aoe_Scheduler_Model_Schedule::STATUS_PENDING . "'
			GROUP BY jobkey
			HAVING qty > 1;
		");
        foreach ($results as $row) {
            $ids = explode(',', $row['ids']);
            $removeIds = array_slice($ids, 1);
            foreach ($removeIds as $id) {
                Mage::getModel('cron/schedule')->load($id)->delete();
            }
        }
    }