specific realm accounting

Is there a way to have only 2 particular realms get entered into our local accounting database? We proxy for 34 realms and presently all their data as well as our 2 local auth realms are being posted into accounting which makes our accounting database really huge. I want to pass any accounting data I receive on to the downstream realms without keeping a record of it locally. I only want our 2 local domains to be in the accounting table. As long as all info we receive is passed along, we hae no need or desire to maintain data on any of our proxied realms other than the auth lines in radius.log. Is there a way to do this? We use mysql but soon will be converting to postgresql. -- Chuck