I found a nice "workaround" that will help other plugin developers that need to parse the parameters (column params) from table qa_eventlog to an associative array:
$queryRecentEvents = mysql_query("SELECT datetime,ipaddress,handle,event,params
FROM `qa_eventlog`
WHERE datetime > NOW() - INTERVAL 8 HOUR
ORDER BY datetime DESC
");
while($row = mysql_fetch_assoc($queryRecentEvents)) {
// convert tab jumps to & to be able to use query function
$toURL = str_replace("\t","&",$row['params']);
// parse as URL
parse_str($toURL, $data);
// access keys in array
$postid = $data['postid'];
// ... do what you like
}