- Introduced optional `date_to` parameter across relevant routes and methods for handling date ranges in department daily reports.
- Added `getDate_to` method and refactored date validation logic into `validateDateLocally` for reuse and reduced redundancy.
- Updated SQL queries in `department_daily_reports_o` to support date range queries using `BETWEEN`.
- Enhanced error handling and parameter validation for date-related inputs.
- Cleaned up comments and redundant code for improved readability.