mailtrain/setup/knex/migrations/20170726155118_create_user_role.js

exports.up = (knex, Promise) => (async() => {
    await knex.schema.table('users', table => {
        table.string('role');
    });
    /* The user role is set automatically in rebuild permissions, which is called upon every start */
})();

exports.down = (knex, Promise) => (async() => {
})();