message: using singletonNextSlot for transaction index db migrate job
diff: @@ -48,6 +48,7 @@ class TransactionIndex extends TransactionIndexBase {
  });
  await this.jobQueue.publishAndWait('ethereum/transaction-index/migrate-db', {}, {
  singletonKey: 'ethereum/transaction-index/migrate-db',
  + singletonNextSlot: true
  });
  }
  