code: public PanelUser updateRole(PanelUser panelUser, PanelUserRole panelUserRole, User modifier) {
      panelUser.setRole(panelUserRole);
      panelUser.setLastModified(new Date());
      panelUser.setLastModifier(modifier);
      
      return persist(panelUser);
    }
docs: Updates panel user's role
  
  @param panelUser panel user
  @param panelUserRole new role
  @param modifier modifier
  @return updated user