[syslog-ng] Log analysis software for syslog-ng+mysql?

[Crayola]

I have used swatch, logchecker, and logwatch 
in the past against standard OS logs.. 

Now I have a centralized syslog system where everything is 
being pumped directly into multiple MySQL databases. 

Are there any log analysis tools that can look at syslog
data in a mysl database and send out alerts based on it?

Thanks, 
Mike