Hello Wayne,
I don't think it is exactly what you are looking for, but I'm currently evaluating Computer Associates eTrust Antivirus for use in a quite mixed environment. It works quite good and has something they call "Alert Manager". I haven't had the chance to review all data sinks they provide, but I think they will at least support a user-defined script (which could then insert data into your RDBMs).
They also provide a great Report-Engine which probably already provides most of the reporst you could genereate through your RDBMS.
The only problem - at least for me - is that they currently don't support RHEL 4 (which will change in the next release).
Oh... and just to mention it: it only costs about $ 40 per license, no matter what system it shall run on (Windows 95-2003, Linux/i386, Linux/390, HP-UX, MacOS X, Netware) and what options (i.e. MS-Exchange and/or Novell Groupwise Scanner) you need.
Regards, Andreas