Endpoint after RS provision to RS serverless migration?

The serverless workgroup endpoint naming convention is different from provisioned cluster

workgroup-name.account-number.aws-region.redshift-serverless.amazonaws.com:port/dev

It is a best practice to use some form of DNS to provide a friendly URL to all downstream applications. You can also configure Amazon Route 53 as your DNS service.

This DNS entry should be used by all downstream applications. This DNS entry can be re-pointed towards the serverless workgroup to minimize impact on downstream applications connections.