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Impex, Bootstrap, Demo and Local Data explains the tables need to initially load people into your local system. (See also KOLE 1.5.x Installation Guide for when to load this data)
Roles and permissions are being refactored for 2.0. You can look at the refactoring that is being proposed.
A workbook that defines the tables required to load roles and permissions as part of the data build is here: (in draft) (link to come.)