// Create primary table
	if err := DB.AutoMigrate(&DynamicUser{}); err != nil {
		t.Fatalf("AutoMigrate create table error: %#v", err)
	}

	// Create sub tables
	for _, v := range []string{"01", "02", "03"} {
		tableName := "dynamic_users_" + v
		m := DB.Scopes(func(db *gorm.DB) *gorm.DB {
			return db.Table(tableName)
		}).Migrator()

		if err := m.AutoMigrate(&DynamicUser{}); err != nil {

        override fun contentLength(): Long = 1024 * 1024 * 256

        override fun writeTo(sink: BufferedSink) {
          var failureCount = 0
          for (i in 0..1023) {
            try {
              sink.write(ByteArray(1024 * 256))
              sink.flush()
            } catch (e: IOException) {
              failureCount++
              if (failureCount == 3) throw e