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http://www.darwinbiler.com/role-based-access-control-erd/
https://stackoverflow.com/questions/13102872/better-way-to-represent-user-roles-in-database
https://dba.stackexchange.com/questions/195700/login-system-how-is-it-possible-to-model-multiple-user-types-identified-by-only
https://softwareengineering.stackexchange.com/questions/156072/database-erd-design-2-types-user-in-one-table
https://www.getdonedone.com/building-the-optimal-user-database-model-for-your-application/
https://developer.intacct.com/entity-relationship-diagrams/users-roles-groups-permissions/
https://www.researchgate.net/figure/ER-diagram-for-User-Role-Attribute_fig2_220480094
https://creately.com/diagram/example/h9om20ph5/ER%20diagram%20of%20user%20and%20admin
http://www.cs.uregina.ca/Links/class-info/215/erd/
https://www.lucidchart.com/pages/er-diagrams
https://searchdatamanagement.techtarget.com/definition/entity-relationship-diagram-ERD
https://www.comp.nus.edu.sg/~lingtw/cs4221/er.pdf
https://docs.bmc.com/docs/decisionsupportserverautomation/89/role-based-access-control-rbac-domain-661332200.html