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

    collection.indexes = [
      'CREATE UNIQUE INDEX `idx_unique_qdtuuld1` ON `instances` (`subdomain`)',
    ]

    // remove
    collection.schema.removeField('yxby5r6b')

    // update
    collection.schema.addField(
      new SchemaField({
        system: false,
        id: 'qdtuuld1',
        name: 'subdomain',
        type: 'text',
        required: true,
        unique: false,
        options: {
          min: null,
          max: 50,
          pattern: '^[a-z][\\-a-z]+$',
        },
      }),
    )

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

    collection.indexes = [
      'CREATE UNIQUE INDEX "idx_unique_qdtuuld1" on "instances" ("subdomain")',
    ]

    // add
    collection.schema.addField(
      new SchemaField({
        system: false,
        id: 'yxby5r6b',
        name: 'platform',
        type: 'text',
        required: true,
        unique: false,
        options: {
          min: null,
          max: null,
          pattern: '',
        },
      }),
    )

    // update
    collection.schema.addField(
      new SchemaField({
        system: false,
        id: 'qdtuuld1',
        name: 'subdomain',
        type: 'text',
        required: true,
        unique: true,
        options: {
          min: null,
          max: 50,
          pattern: '^[a-z][\\-a-z]+$',
        },
      }),
    )

    return dao.saveCollection(collection)
  },
)