Developed and integrated comprehensive 2025 calendar data for the codenautas/siper repository, enabling the platform to support accurate date-based operations such as planning, scheduling, and reporting. The work involved creating SQL scripts and configuration files in YAML and Shell to insert all relevant dates and holidays for the year, ensuring the system is holiday-aware and maintains data integrity. Leveraging skills in configuration management, database management, and SQL scripting, the approach emphasized explicit date mapping and a configuration-driven methodology. This foundation improved the maintainability and reliability of date-related features, supporting robust operational workflows across the platform for the coming year.