Merge remote changes with local config improvements

- Merged remote .env.example updates
- Kept local graceful config error handling
- Kept local SMTP username/password variables

.env.example

@@ -0,0 +1,59 @@
+# Price Tracker Environment Variables
+# Copy this file to .env and uncomment/modify the variables you want to override
+
+# ================================
+# Database Configuration
+# ================================
+# Path to the SQLite database file
+DATABASE_PATH=/app/data/price_tracker.db
+
+# ================================
+# Scraping Configuration
+# ================================
+# Delay between requests in seconds (default: 2)
+DELAY_BETWEEN_REQUESTS=2
+
+# Maximum concurrent requests (default: 1)
+MAX_CONCURRENT_REQUESTS=1
+
+# Request timeout in seconds (default: 30)
+REQUEST_TIMEOUT=30
+
+# Number of retry attempts (default: 3)
+RETRY_ATTEMPTS=3
+
+# ================================
+# Email Notifications
+# ================================
+# Enable/disable email notifications (true/false)
+EMAIL_ENABLED=false
+
+# SMTP server settings
+SMTP_SERVER=smtp.gmail.com
+SMTP_PORT=587
+
+# Email credentials (use app passwords for Gmail)
+SENDER_EMAIL=your-email@gmail.com
+SENDER_PASSWORD=your-app-password
+
+# Where to send price alerts
+RECIPIENT_EMAIL=alerts@yourdomain.com
+
+# ================================
+# Webhook Notifications
+# ================================
+# Enable/disable webhook notifications (true/false)
+WEBHOOK_ENABLED=false
+
+# Webhook URL for price alerts
+WEBHOOK_URL=https://your-webhook-url.com/notify
+
+# ================================
+# Flask Application
+# ================================
+# Flask environment (development/production)
+FLASK_ENV=production
+
+# Python settings
+PYTHONDONTWRITEBYTECODE=1
+PYTHONUNBUFFERED=1

src/config.py

@@ -273,6 +273,87 @@ class Config:
         # Return as string
         return value
     
+    def _apply_env_overrides(self):
+        """Apply environment variable overrides to configuration."""
+        # Database path override
+        if os.getenv('DATABASE_PATH'):
+            if 'database' not in self._config:
+                self._config['database'] = {}
+            self._config['database']['path'] = os.getenv('DATABASE_PATH')
+        
+        # Email notification overrides
+        email_env_vars = {
+            'SMTP_SERVER': ['notifications', 'email', 'smtp_server'],
+            'SMTP_PORT': ['notifications', 'email', 'smtp_port'],
+            'SENDER_EMAIL': ['notifications', 'email', 'sender_email'],
+            'SENDER_PASSWORD': ['notifications', 'email', 'sender_password'],
+            'RECIPIENT_EMAIL': ['notifications', 'email', 'recipient_email'],
+            'EMAIL_ENABLED': ['notifications', 'email', 'enabled']
+        }
+        
+        for env_var, config_path in email_env_vars.items():
+            env_value = os.getenv(env_var)
+            if env_value is not None:
+                self._set_nested_config(config_path, env_value)
+        
+        # Webhook notification overrides
+        webhook_env_vars = {
+            'WEBHOOK_URL': ['notifications', 'webhook', 'url'],
+            'WEBHOOK_ENABLED': ['notifications', 'webhook', 'enabled']
+        }
+        
+        for env_var, config_path in webhook_env_vars.items():
+            env_value = os.getenv(env_var)
+            if env_value is not None:
+                self._set_nested_config(config_path, env_value)
+        
+        # Scraping configuration overrides
+        scraping_env_vars = {
+            'DELAY_BETWEEN_REQUESTS': ['scraping', 'delay_between_requests'],
+            'MAX_CONCURRENT_REQUESTS': ['scraping', 'max_concurrent_requests'],
+            'REQUEST_TIMEOUT': ['scraping', 'timeout'],
+            'RETRY_ATTEMPTS': ['scraping', 'retry_attempts']
+        }
+        
+        for env_var, config_path in scraping_env_vars.items():
+            env_value = os.getenv(env_var)
+            if env_value is not None:
+                self._set_nested_config(config_path, env_value)
+    
+    def _set_nested_config(self, path: list, value: str):
+        """Set a nested configuration value from environment variable."""
+        # Convert string values to appropriate types
+        converted_value = self._convert_env_value(value)
+        
+        # Navigate to the correct nested location
+        current = self._config
+        for key in path[:-1]:
+            if key not in current:
+                current[key] = {}
+            current = current[key]
+        
+        current[path[-1]] = converted_value
+    
+    def _convert_env_value(self, value: str):
+        """Convert environment variable string to appropriate type."""
+        # Handle boolean values
+        if value.lower() in ('true', 'false'):
+            return value.lower() == 'true'
+        
+        # Handle integer values
+        if value.isdigit():
+            return int(value)
+        
+        # Handle float values
+        try:
+            if '.' in value:
+                return float(value)
+        except ValueError:
+            pass
+        
+        # Return as string
+        return value
+    
     @property
     def database_path(self) -> str:
         """Get database file path."""