create table users (
  id integer not null,
  username text not null,
  role text references user_roles not null,
  created_at timestamptz not null,
  updated_at timestamptz not null
);
comment on table users is '
  User
';

comment on column users.id is '
  Unique user id
';
comment on column users.username is '
  Username
';
comment on column users.role is '
  User Role
';
comment on column users.created_at is '
  Creation date-time
';
comment on column users.updated_at is '
  Last update date-time
';