final app for testing and deployment

.env.production

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+# QR Code Manager - Production Environment Configuration
+# Copy this file to .env and customize for your deployment
+
+# Flask Configuration
+FLASK_ENV=production
+SECRET_KEY=your-super-secret-key-change-this-in-production-please
+
+# Admin Credentials (CHANGE THESE BEFORE DEPLOYMENT!)
+ADMIN_USERNAME=admin # set your admin username
+ADMIN_PASSWORD=admin-password-here  # Set a strong password
+
+# Application Domain (for URL shortener)
+APP_DOMAIN=localhost:5000 # Change to your production domain, e.g., qr.[domain].com
+
+# Database (Future use)
+# DATABASE_URL=sqlite:///qr_manager.db
+
+# SSL/TLS Configuration (Uncomment for HTTPS)
+# SSL_KEYFILE=/path/to/your/private.key
+# SSL_CERTFILE=/path/to/your/certificate.crt
+
+# Logging Configuration
+LOG_LEVEL=INFO
+LOG_FILE=/app/logs/qr_manager.log
+
+# Security Settings
+SESSION_COOKIE_SECURE=false
+SESSION_COOKIE_HTTPONLY=true
+SESSION_COOKIE_SAMESITE=Lax
+
+# Performance Settings
+UPLOAD_MAX_SIZE=10485760  # 10MB in bytes
+CACHE_TIMEOUT=3600        # 1 hour in seconds
+
+# URL Shortener Settings
+SHORT_URL_LENGTH=6
+CUSTOM_DOMAIN_ENABLED=true # Enable custom domain for URL shortener and set APP_DOMAIN
+
+# Health Check Settings
+HEALTH_CHECK_ENABLED=true
+HEALTH_CHECK_INTERVAL=30