filter out or delete log entries

I have rather odd question.  We are looking to actually remove some types of logging entries before they come in not just filter them on the display.  We use Kiwi Syslog to feed a custom Network Management Platform we have.  We have a pearl script pulling in the log file entries from Kiwi Sylog every 5 min and populating a MySQL database.  Right now we parse messages in the database, but I'd like to have a way of deleting them in the Kiwi Syslog files before the database pulls them in