Worked on the signalapp/Signal-Android repository, focusing on refining the message retention policy to address a critical edge case. Implemented a targeted bug fix that updated the KeepMessageDuration logic from 365 to 366 days, ensuring messages from exactly one year ago, including those spanning leap years, are accurately preserved. This adjustment resolved Issue #13889 and improved data integrity by preventing unintended message loss at the calendar boundary. The work involved careful handling of date and time calculations within the Android codebase, utilizing Java and Android development skills, and collaborating through a pull request-driven workflow to deliver a robust solution.