I am designing a database for a document management app for my office. I want to get the backend right so I don’t have issues in the future. Basically all users will be categorized into roles e.g, super admin, admin, staff and interns. All documents will have access restrictions e.g public(all user roles can view the document), private (only user who created it can view), role-based(this means only users with the same roles can view these documents). However, Admins and super admins can view all documents. One user can have many documents. Also user roles can be updated e.g from staff to admin etc. I will be using Postgres with Sequelize as my ORM for this project. Based on the description above, is this a good design? What can be improved? Any inputs will be appreciated.