nizika_video/server/core/initializers/migrations/0755-unique-viewer-url.ts

import * as Sequelize from 'sequelize'

async function up (utils: {
  transaction: Sequelize.Transaction
  queryInterface: Sequelize.QueryInterface
  sequelize: Sequelize.Sequelize
  db: any
}): Promise<void> {
  const { transaction } = utils

  const query = 'DELETE FROM "localVideoViewer" t1 ' +
  'USING (SELECT MIN(id) as id, "url" FROM "localVideoViewer" GROUP BY "url" HAVING COUNT(*) > 1) t2 ' +
  'WHERE t1."url" = t2."url" AND t1.id <> t2.id'

  await utils.sequelize.query(query, { transaction })
}

async function down (utils: {
  queryInterface: Sequelize.QueryInterface
  transaction: Sequelize.Transaction
}) {
}

export {
  up,
  down
}