Remove .env_example file and implement MetricsUpdater service for enhanced metrics tracking. Update bot.py to start and stop metrics updater, and improve database connection handling in CRUD operations with metrics tracking. Update README with details on metrics issues and fixes.

services/infrastructure/__init__.py

@@ -5,6 +5,8 @@
 from .database import DatabaseService
 from .logger import get_logger, setup_logging
 from .metrics import MetricsService, get_metrics_service
+from .metrics_updater import MetricsUpdater, get_metrics_updater, start_metrics_updater, stop_metrics_updater
+from .db_metrics_decorator import track_db_operation, track_db_connection
 from .pid_manager import PIDManager, get_pid_manager, cleanup_pid_file
 from .logging_decorators import (
     log_function_call, log_business_event, log_fsm_transition,
@@ -21,6 +23,8 @@ __all__ = [
     'DatabaseService', 
     'get_logger', 'setup_logging',
     'MetricsService', 'get_metrics_service',
+    'MetricsUpdater', 'get_metrics_updater', 'start_metrics_updater', 'stop_metrics_updater',
+    'track_db_operation', 'track_db_connection',
     'PIDManager', 'get_pid_manager', 'cleanup_pid_file',
     'log_function_call', 'log_business_event', 'log_fsm_transition',
     'log_handler', 'log_service', 'log_business', 'log_fsm',