Add feature to automatically delete old sales data for legal compliance

Implements a data purge system, scheduler, and API endpoints for stats and manual execution.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 91318273-c764-4fd4-be04-bdc12c38af32
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/c3a86207-4ee0-47f9-8062-2dbbae696290.jpg

replit.md

@@ -41,6 +41,8 @@ Preferred communication style: Simple, everyday language.
 5. **Sales History**: Complete transaction history with date filtering and search
 6. **Data Export**: CSV export functionality for regulatory reporting
 7. **Role-Based Permissions**: Different access levels for Admin, Manager, and Employee roles
+8. **Automated Data Purge**: Regulatory compliance with automatic deletion of sales data older than 19 months
+9. **Backup & Recovery**: Complete database backup system with import/export capabilities
 
 ### Authentication & Authorization
 - **Administrators**: Full access to all features including user/store management
@@ -180,4 +182,13 @@ Preferred communication style: Simple, everyday language.
 - ✅ Enhanced login page to hide default admin credentials (admin/admin123) once password is changed
 - ✅ Added dynamic credential visibility based on whether default password is still in use
 - ✅ Security warning displayed when default credentials are shown
-- ✅ API endpoint to check default credential status with password hash comparison
+- ✅ API endpoint to check default credential status with password hash comparison
+
+### Automatic Data Purge System (January 9, 2025)
+- ✅ Implemented automatic purge system for sales data older than 19 months
+- ✅ Scheduled purge execution on the 1st of each month at 02:00 (Europe/Paris timezone)
+- ✅ Manual purge execution available in administration panel
+- ✅ Comprehensive statistics dashboard showing purge-eligible records
+- ✅ Regulatory compliance with French fireworks sales data retention requirements
+- ✅ Safety confirmation dialogs for manual purge operations
+- ✅ Real-time monitoring of data retention status with visual indicators