text: const knex = require('knex')
  
  /**
   * @param {knex} knex
   */
  exports.up = function (knex) {
    return knex.schema.alterTable('files', $ => {
      $.integer('size').notNullable()
    })
  };
  
  /**
   * @param {knex} knex
   */
  exports.down = function (knex) {
    return knex.schema.alterTable('files', $ => {
      $.dropColumn('size')
    })
  };
  