Change db to Mysql

requirements.txt.bak

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+# QR Code Management System - Python Dependencies
+# Production-ready Flask application with PostgreSQL support
+
+# Core Flask Framework
+Flask==2.3.3
+Flask-SQLAlchemy==3.0.5
+
+# Database Support
+psycopg2-binary==2.9.7          # PostgreSQL adapter
+SQLAlchemy==2.0.21
+
+# Security and Authentication
+Werkzeug==2.3.7                 # Security utilities and password hashing
+
+# QR Code Generation
+qrcode==7.4.2                   # QR code generation library
+Pillow==10.0.1                  # Image processing for QR codes
+
+# User Agent Detection (NEW)
+user-agents==2.2.0              # Device and browser detection from user agent strings
+
+# URL and Regex Processing
+regex==2023.8.8                 # Enhanced regex support for URL generation
+
+# Environment and Configuration
+python-dotenv==1.0.0            # Environment variable management
+
+# Date and Time Processing
+python-dateutil==2.8.2          # Extended date/time processing
+
+# Development and Testing (optional)
+pytest==7.4.2                   # Testing framework
+pytest-flask==1.2.0             # Flask testing utilities
+Flask-Testing==0.8.1            # Additional Flask testing tools
+
+# Production Server (optional)
+gunicorn==21.2.0                # WSGI HTTP Server for production
+gevent==23.7.0                  # Async worker support
+
+# Utilities
+click==8.1.7                    # Command line interface creation
+itsdangerous==2.1.2             # Secure data serialization
+Jinja2==3.1.2                   # Template engine
+MarkupSafe==2.1.3               # Safe string handling
+
+# Data Export and Processing (NEW)
+openpyxl==3.1.2                 # Excel file generation for attendance reports
+pandas==2.1.1                   # Data manipulation for reports (optional)
+
+# HTTP Requests (for potential integrations)
+requests==2.31.0                # HTTP library for external API calls
+
+# Caching (optional for performance)
+Flask-Caching==2.1.0            # Caching support for Flask
+
+# Logging and Monitoring (optional)
+python-json-logger==2.0.7       # Structured logging support