/**
* Update the cache on the database
* @return int The number of new event saved
*/
public static function updateCache()
{
$startTime = microtime(true);
$lastDate = CacheService::fetchLastDate();
$events = CacheService::getEvents($lastDate);
CacheService::putEvents($events);
$endTime = microtime(true);
Logger::log("Tempo di fetch dei log:", $endTime - $startTime);
return count($events);
}