During November 2024, Niflheim1997 developed batch citizen management functionality for grades in the aau-giraf/weekplanner-api repository. This work refactored the existing add-citizen and remove-citizen endpoints to support bulk operations, allowing multiple citizens to be added or removed from a grade in a single API request. The implementation, written in C#, emphasized robust error handling by reporting conflicts when citizens were already assigned or removed, and included validation to ensure all selected citizens existed before processing. By consolidating operations, Niflheim1997 reduced API round trips and improved data integrity, demonstrating depth in API development, backend engineering, and database management.