Worked on the thinkst/canarytokens repository to enhance email data integrity by implementing case normalization for email addresses in backend systems. Addressed a bug where inconsistent email casing could lead to duplicate entries or missed data by ensuring all emails are converted to lowercase before database storage and lookups. Developed and integrated regression tests in Python to verify that both uppercase and lowercase email inputs are handled consistently, preventing future regressions. Focused on backend development and database management, this work improved the reliability of email-related queries and laid the foundation for more scalable email indexing and robust testing practices within the project.