ST_ROLE - Virtual system table defining possible role.
| value | Description | 
| root | Administrator of the organisation. All rights granted. | 
| president | President of the organisation. | 
| assistant | Assistant of the organisation, usually assist the president. | 
| accountManager | Account manager of the organisation. | 
| employee | Employee of the organisation. | 
| member | Member of the organisation, or member of a section. | 
| sectionManager | Manager of a section. | 
| supervisor | Supervisor of a section. | 
Each role defines a level. A level grant access to define on a higher level:
A role with level equals or higher than 1000 cannot log in the application.