Worked on the nextcloud/richdocuments repository, focusing on backend development and code quality improvements using PHP and database management skills. Addressed a bug affecting guest user document retention by refining the deletion logic to properly handle cases where the user ID is null, ensuring that guest documents maintain their content after being accessed. Additionally, improved maintainability by aligning code formatting in TemplateManager.php with project-wide standards, specifically replacing a tab with four spaces in SQL query construction. These targeted changes enhanced reliability for guest users and streamlined future code reviews, contributing to a more robust and maintainable codebase overall.