migrate(
  (db) => {
    const dao = new Dao(db)
    const collection = dao.findCollectionByNameOrId('etae8tuiaxl6xfv')

    // add
    collection.schema.addField(
      new SchemaField({
        system: false,
        id: 'mexrkb5z',
        name: 'maintenance',
        type: 'bool',
        required: false,
        unique: false,
        options: {},
      }),
    )

    return dao.saveCollection(collection)
  },
  (db) => {
    const dao = new Dao(db)
    const collection = dao.findCollectionByNameOrId('etae8tuiaxl6xfv')

    // remove
    collection.schema.removeField('mexrkb5z')

    return dao.saveCollection(collection)
  },
)