basically what i want in my model that there is enviroment , in which i want to that particular user can have that access to the particular files(modules) or not . same user can have multiple roles(viewer,planner,approver,admin) for different modules(basically routes on that site/enviroment) for different ad_account. its something like that , but i am not able to setup my schema according to thatt to validate it. kindly help me forming schema and relations