Implement database connection pooling with context manager pattern

- Added DBUtils PooledDB for intelligent connection pooling
- Created db_pool.py with lazy-initialized connection pool (max 20 connections)
- Added db_connection_context() context manager for safe connection handling
- Refactored all 19 database operations to use context manager pattern
- Ensures proper connection cleanup and exception handling
- Prevents connection exhaustion on POST requests
- Added logging configuration for debugging

Changes:
- py_app/app/db_pool.py: New connection pool manager
- py_app/app/logging_config.py: Centralized logging
- py_app/app/__init__.py: Updated to use connection pool
- py_app/app/routes.py: Refactored all DB operations to use context manager
- py_app/app/settings.py: Updated settings handlers
- py_app/requirements.txt: Added DBUtils dependency

This solves the connection timeout issues experienced with the fgscan page.

py_app/app/logging_config.py

@@ -0,0 +1,142 @@
+"""
+Logging Configuration for Trasabilitate Application
+Centralizes all logging setup for the application
+"""
+
+import logging
+import logging.handlers
+import os
+import sys
+from datetime import datetime
+
+def setup_logging(app=None, log_dir='/srv/quality_app/logs'):
+    """
+    Configure comprehensive logging for the application
+    
+    Args:
+        app: Flask app instance (optional)
+        log_dir: Directory to store log files
+    """
+    
+    # Ensure log directory exists
+    os.makedirs(log_dir, exist_ok=True)
+    
+    # Create formatters
+    detailed_formatter = logging.Formatter(
+        '[%(asctime)s] [%(name)s] [%(levelname)s] %(filename)s:%(lineno)d - %(funcName)s() - %(message)s',
+        datefmt='%Y-%m-%d %H:%M:%S'
+    )
+    
+    simple_formatter = logging.Formatter(
+        '[%(asctime)s] [%(levelname)s] %(message)s',
+        datefmt='%Y-%m-%d %H:%M:%S'
+    )
+    
+    # Create logger
+    root_logger = logging.getLogger()
+    root_logger.setLevel(logging.DEBUG)
+    
+    # Remove any existing handlers to avoid duplicates
+    for handler in root_logger.handlers[:]:
+        root_logger.removeHandler(handler)
+    
+    # ========================================================================
+    # File Handler - All logs (DEBUG and above)
+    # ========================================================================
+    all_log_file = os.path.join(log_dir, f'application_{datetime.now().strftime("%Y%m%d")}.log')
+    file_handler_all = logging.handlers.RotatingFileHandler(
+        all_log_file,
+        maxBytes=10 * 1024 * 1024,  # 10 MB
+        backupCount=10
+    )
+    file_handler_all.setLevel(logging.DEBUG)
+    file_handler_all.setFormatter(detailed_formatter)
+    root_logger.addHandler(file_handler_all)
+    
+    # ========================================================================
+    # File Handler - Error logs (ERROR and above)
+    # ========================================================================
+    error_log_file = os.path.join(log_dir, f'errors_{datetime.now().strftime("%Y%m%d")}.log')
+    file_handler_errors = logging.handlers.RotatingFileHandler(
+        error_log_file,
+        maxBytes=5 * 1024 * 1024,  # 5 MB
+        backupCount=5
+    )
+    file_handler_errors.setLevel(logging.ERROR)
+    file_handler_errors.setFormatter(detailed_formatter)
+    root_logger.addHandler(file_handler_errors)
+    
+    # ========================================================================
+    # Console Handler - INFO and above (for Docker logs)
+    # ========================================================================
+    console_handler = logging.StreamHandler(sys.stdout)
+    console_handler.setLevel(logging.INFO)
+    console_handler.setFormatter(simple_formatter)
+    root_logger.addHandler(console_handler)
+    
+    # ========================================================================
+    # Database-specific logger
+    # ========================================================================
+    db_logger = logging.getLogger('trasabilitate.db')
+    db_logger.setLevel(logging.DEBUG)
+    
+    db_log_file = os.path.join(log_dir, f'database_{datetime.now().strftime("%Y%m%d")}.log')
+    db_file_handler = logging.handlers.RotatingFileHandler(
+        db_log_file,
+        maxBytes=10 * 1024 * 1024,  # 10 MB
+        backupCount=10
+    )
+    db_file_handler.setLevel(logging.DEBUG)
+    db_file_handler.setFormatter(detailed_formatter)
+    db_logger.addHandler(db_file_handler)
+    
+    # ========================================================================
+    # Routes-specific logger
+    # ========================================================================
+    routes_logger = logging.getLogger('trasabilitate.routes')
+    routes_logger.setLevel(logging.DEBUG)
+    
+    routes_log_file = os.path.join(log_dir, f'routes_{datetime.now().strftime("%Y%m%d")}.log')
+    routes_file_handler = logging.handlers.RotatingFileHandler(
+        routes_log_file,
+        maxBytes=10 * 1024 * 1024,  # 10 MB
+        backupCount=10
+    )
+    routes_file_handler.setLevel(logging.DEBUG)
+    routes_file_handler.setFormatter(detailed_formatter)
+    routes_logger.addHandler(routes_file_handler)
+    
+    # ========================================================================
+    # Settings-specific logger
+    # ========================================================================
+    settings_logger = logging.getLogger('trasabilitate.settings')
+    settings_logger.setLevel(logging.DEBUG)
+    
+    settings_log_file = os.path.join(log_dir, f'settings_{datetime.now().strftime("%Y%m%d")}.log')
+    settings_file_handler = logging.handlers.RotatingFileHandler(
+        settings_log_file,
+        maxBytes=5 * 1024 * 1024,  # 5 MB
+        backupCount=5
+    )
+    settings_file_handler.setLevel(logging.DEBUG)
+    settings_file_handler.setFormatter(detailed_formatter)
+    settings_logger.addHandler(settings_file_handler)
+    
+    # Log initialization
+    root_logger.info("=" * 80)
+    root_logger.info("Trasabilitate Application - Logging Initialized")
+    root_logger.info("=" * 80)
+    root_logger.info(f"Log directory: {log_dir}")
+    root_logger.info(f"Main log file: {all_log_file}")
+    root_logger.info(f"Error log file: {error_log_file}")
+    root_logger.info(f"Database log file: {db_log_file}")
+    root_logger.info(f"Routes log file: {routes_log_file}")
+    root_logger.info(f"Settings log file: {settings_log_file}")
+    root_logger.info("=" * 80)
+    
+    return root_logger
+
+
+def get_logger(name):
+    """Get a logger with the given name"""
+    return logging.getLogger(f'trasabilitate.{name}')