[Zope] keeping sql data and catalog in sync?

I have a large SQL database and have successfully cataloged that using the nice howto on zope.org. The problem is that this database is constantly growing. What's the best way to get new data into the catalog? And how do I update catalog entries when the database changes? This database is maintained by a separate app (not Zope). I could just drop the catalog and re-create it daily but I was wondering if anyone else has faced this problem before and had any suggestions. thanks much -Kevin __________________________________________________ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/