During January 2025, Mingyu Lian focused on database schema migrations for the codersforcauses/wajo repository, addressing evolving requirements in the Quiz QuestionAttempt and User models. Using Django and Python, Mingyu introduced new migrations that replaced legacy structures, aligning school and student user fields with updated models to ensure data consistency. The work emphasized migration safety by adding dedicated migration tests, reducing the risk of inconsistencies during quiz operations and user data handling. This approach enabled smoother deployments and laid the groundwork for future analytics and reporting features, demonstrating a solid grasp of database migration, Django ORM, and schema maintainability practices.