Worked on the iota-uz/iota-sdk repository to address a critical issue affecting user data reliability. Focused on backend development and database management, the work involved correcting the SQL parameter handling in the userUpdateLastLoginQuery to ensure that last login timestamps updated the correct user record. Using Go and SQL, the developer applied targeted changes to fix the placeholder usage and adjusted the parameter order, thereby maintaining data integrity and preventing erroneous updates that could impact user churn analytics. Additionally, a minor dependency update in go.mod was made to align with the revised SQL logic, further stabilizing the codebase.