Pour ma part j'utilise un script fait maison :

<?php
    require(dirname(__FILE__).'/config/config.inc.php');
    
    /*******************************************************************************
    ********** Supression des Stats appelé par Cron *******************************
    *******************************************************************************/
    
    // nbr de jours à conserver
    $days=180; 	//connections etc ...
    $day_page=180; 	//page viewed
    
    // nbr de guest à conserver
    $nbGuest=5000;
    
    $interval=$days.' DAY';
    
    //1- ps_connections_pages delete
    $res=Db::getInstance()->Execute('
    DELETE FROM `'._DB_PREFIX_.'connections_page`
    WHERE time_start < DATE_SUB(NOW(), INTERVAL '.$interval.')');
    if(!$res)
    	die('error delete ps_connections_pages for '.$days.' day(s)');
    
    
    //2- ps_connections delete
    $res=Db::getInstance()->Execute('
    DELETE FROM `'._DB_PREFIX_.'connections`
    WHERE date_add < DATE_SUB(NOW(), INTERVAL '.$interval.')');
    if(!$res)
    	die('error delete ps_connections for '.$days.' day(s)');
    
    //3- ps_connections_source delete
    $res=Db::getInstance()->Execute('
    DELETE FROM `'._DB_PREFIX_.'connections_source`
    WHERE date_add < DATE_SUB(NOW(), INTERVAL '.$interval.')');
    if(!$res)
    	die('error delete ps_connections_source for '.$days.' day(s)');
    
    //4- ps_page_viewed delete
    $currentRange=DateRange::getCurrentRange();
    $endRange = $currentRange-$day_page;
    $res=Db::getInstance()->Execute('
    DELETE FROM `'._DB_PREFIX_.'page_viewed`
    WHERE id_date_range < '.$endRange);
    if(!$res)
    	die('error delete ps_page_viewed for '.$endRange.' date_range');
    
    //5- ps_guest delete
    $sql="SELECT `id_guest` FROM `ps_guest` ORDER BY `id_guest` DESC LIMIT 0, 1";
    $res = Db::getInstance()->ExecuteS($sql);
    if(!$res)
    	die('error select highest ps_guest');
    $currentGuest=$res[0]['id_guest'];
    $endGuest = $currentGuest-$nbGuest;
    $res=Db::getInstance()->Execute('
    DELETE FROM `'._DB_PREFIX_.'guest`
    WHERE id_guest < '.$endGuest);
    if(!$res)
    	die('error delete ps_guest for '.$endGuest.' endGuest');