Worked on the nammayatri/nammayatri repository to address a regression in the API’s change-over station filtering logic, focusing on restoring prior behavior for stability and client compatibility. Applied a targeted rollback using Git to revert the problematic commit, ensuring that existing clients continued to receive expected API responses without requiring integration changes. The work involved backend development in Haskell, with attention to API design and regression testing to maintain reliability. No new features were introduced during this period, as the primary objective was to preserve established change-over station handling and minimize risk for users relying on the previous backend logic.