Worked on the telegramdesktop/tdesktop repository, focusing on enhancing the reliability and data integrity of the Todo List editing flow. Addressed a critical issue in the edit box by refining the logic for assigning task IDs, ensuring that each new or existing task receives a unique and correctly sequenced identifier. This fix prevents ID collisions and improves the consistency of task management for users. The solution involved C++ development and algorithm optimization, with targeted changes to the usedId handling in the edit_todo_list_box. The work contributed to a more stable user experience and reinforced data consistency within the Todo List feature.