January 2026 focused on hardening and enriching the holiday data workflow in openemr/openemr. Delivered Holiday Data CSV Import Enhancements with a safe CSV parsing path, improved validation, and clearer user feedback. Introduced a shared CSV parsing helper and a safe while-read import loop, added header support, and ensured empty rows are skipped. Implemented comprehensive upload validation and error reporting, surfacing actionable messages in the UI. Hardened the calendar import flow to prevent bad data from entering calendar_external, fixed synchronization after import, and reduced PHP warnings. Refactored for maintainability with explicit return types and PSR-12 conformance, consolidating parsing logic in a single helper. These changes improve data quality, reduce support incidents, and deliver a smoother admin experience.