[rules-users] Architectural problems and web service call

Hi, I'm new on Drools and i try to understand the architecture of the suite and the dependencies between Guvnor and Expert. I want to know if there is a physical link between the repository of rules managed by Guvnor and the rules engine Expert when playing a rule in production. if not, is it possible to modify a rule in production without an IT redeployment? More generally, how are persist rules in the repository? Is it possible to save them in a database or is it only persist in cache? if you have any documentation on that. And last question, do you have any documentation on how to expose a service rule as a web service and how to consume it with the API? Thanks you for your feedback.