comments on rules processing

I'm not really sure what I need, and that may be the problem.  What I 
got now is basically an advanced CRUD application.  What I want in the 
application is to set up rules, configurable at run time, that will 
trigger other items to happen.  I don't want the "rules" hard coded in a 
helper or model, but rather in a db or conf file that could be changed 
by user.

I don't want to reinvent the wheel here, so are there any best practices 
or tools that anyone here uses?

Comments appreciated
gene
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