Hi @swamy_63747 , welcome!
1) We have not worked with newrelic yet. Every observability system has different mechanisms for integrating, so unfortunately we can't give much guidance at this time
2) Our server performs all necessary DB migrations when it starts again, so upgrading the server should update the DB as well
3) We consider the SQL queries / schema an implementation detail and subject to change. The main pattern of interaction is via the API. Because of this, we don't have public docs on the SQL schema