Worked on improving Slack thread imports in the zulip/zulip repository, focusing on backend development and data import reliability. Addressed a bug where messages missing user or parent_user_id caused incorrect attribution and data integrity issues during API integration. Implemented logic to handle these missing fields and introduced caching of thread parent information, ensuring that bot messages and replies were correctly linked. This approach enhanced the accuracy of imported Slack data, reduced the need for manual corrections, and improved analytics and operational insights. Utilized Python to deliver a more stable and maintainable import pipeline, supporting reliable future data migrations and analysis.