[rules-users] Running rules from the past

Hi folks, I work at a bank and I am currently studying the best way to use JBoss Rules so that it fits our needs. Our loan analysis process can take several months depending on the type of the loan. Although our business rules can evolve, a loan must follow the rules valid at the time the loan application was made. In order to attend this requirement I thought about storing at the database the name of the current snapshot with the loan application data, so that it will possible run this rules in the future without freezing my rule database. * Is there a better way to attend this requirement? * How can I retrieve meta information from a snapshot, such as the date when the snapshot was created? Thanks in advance, Celso