exports.up = async function (knex, Promise) {
  await knex.schema.table('threads', table => {
    table.string('alert_id', 20).nullable().defaultTo(null).after('scheduled_close_name');
  });
};

exports.down = async function(knex, Promise) {
  await knex.schema.table('threads', table => {
    table.dropColumn('alert_id');
  });
};