text: DELETE
  FROM roles;
  
  DELETE
  FROM users;
  
  DELETE
  FROM userroles;
  
  INSERT INTO roles(roleid, role)
      VALUES (1, 'ADMIN'),
             (2, 'USER');
  
  INSERT INTO users(userid, username, password)
      VALUES (1, 'lindell', 'password'),
             (2, 'jason', 'password');
  
  INSERT INTO userroles(userid, roleid)
      VALUES (1, 1),
             (1, 2),
             (2, 2);
  