Turn of user acc - MySQL

Hello I made small web based application and it uses MySql database. I can add user accounts, create packages, add access points etc and now I need to create script for user control. Question is next. Is it better to remove the username from radcheck table or it is better option to add access-reject atribute for specific user in radreply table. Is there any better solution. Also I'm thinking to create small perl script which I can call during auth process. I'm not sure did you understand me :)