text: /**
   * Create users table.
   *
   * @param  {object} knex
   * @return {Promise}
   */
  export function up(knex) {
    return knex.schema.createTable('tags', table => {
      table.increments();
      table
        .string('tag')
        .unique()
        .notNull();
    });
  }
  
  /**
   * Drop tags table.
   *
   * @param  {object} knex
   * @return {Promise}
   */
  export function down(knex) {
    return knex.schema.dropTable('tags');
  }
  