Refactor DB methods and add transaction checks

[cgalibern]

Summary

This pull request refactors the DB methods to use consistent receiver naming (oDb instead of odb). Additionally, it introduces transaction checks in the Commit and Rollback methods to ensure proper database handling.

Notable Changes

• Refactored receiver naming in DB methods from odb to oDb.
• Added transaction state checks to Commit and Rollback methods.

Checklist

• Tests have been added/updated (if applicable).