Consider handling rollback and save points

[iamgollum]

Observation

Sometimes mistakes are made when transactions are sent - especially depending on the isolation levels #25. As a result, RDBMS implement save points and rollback behavior.

Action Item

Implement strategies or configurations for save points and roll back behavior. More info can be found at end of this article: https://docs.oracle.com/javase/tutorial/jdbc/basics/transactions.html