text: 
  exports.up = async function (knex) {
    await knex.raw(`
      ALTER TABLE post
      ADD COLUMN visibility ENUM('public', 'private', 'not-listed') DEFAULT 'not-listed'
    ;`)
  }
  
  exports.down = async function (knex) {
    await knex.raw(`
      ALTER TABLE post
      DROP COLUMN visibility
    ;`)
  }
  