need my referral script modified

Currently my referral tracking script inputs every single uniq hit into the database.. being i run an adult site this db is getting fairly Huge. I would like it to stop inputting them in sql but still keep track of the totals per domain, i can only use this same script since it is linked to my site and allows people to submit to my site at a ratio in/out. Also I want to limit what domains it tracks, currently it will track any and every domain that sends traffic. i included the [login to view URL] for you to get an idea.