You can only do those if schema changes are transactional. The transaction could update the checksum and return it for the caller to use in subsequent calls. A

You can only do those if schema changes are transactional. The transaction could update the checksum and return it for the caller to use in subsequent calls. And yes, that would shut off other clients that want to be sure to talk to the correct schema, but if you opt in to such a scheme, that’s what you want.