Enhance bot functionality and refactor database interactions

- Added `ca-certificates` installation to Dockerfile for improved network security.
- Updated health check command in Dockerfile to include better timeout handling.
- Refactored `run_helper.py` to implement proper signal handling and logging during shutdown.
- Transitioned database operations to an asynchronous model in `async_db.py`, improving performance and responsiveness.
- Updated database schema to support new foreign key relationships and optimized indexing for better query performance.
- Enhanced various bot handlers to utilize async database methods, improving overall efficiency and user experience.
- Removed obsolete database and fix scripts to streamline the project structure.

helper_bot/server_prometheus.py

@@ -59,10 +59,43 @@ class MetricsServer:
     
     async def health_handler(self, request: web.Request) -> web.Response:
         """Handle /health endpoint for health checks."""
-        return web.Response(
-            text="OK",
-            content_type='text/plain'
-        )
+        try:
+            # Проверяем доступность метрик
+            if not metrics:
+                return web.Response(
+                    text="ERROR: Metrics not available",
+                    content_type='text/plain',
+                    status=503
+                )
+            
+            # Проверяем, что можем получить метрики
+            try:
+                metrics_data = metrics.get_metrics()
+                if not metrics_data:
+                    return web.Response(
+                        text="ERROR: Empty metrics",
+                        content_type='text/plain',
+                        status=503
+                    )
+            except Exception as e:
+                return web.Response(
+                    text=f"ERROR: Metrics generation failed: {e}",
+                    content_type='text/plain',
+                    status=503
+                )
+            
+            return web.Response(
+                text="OK",
+                content_type='text/plain',
+                status=200
+            )
+        except Exception as e:
+            self.logger.error(f"Health check failed: {e}")
+            return web.Response(
+                text=f"ERROR: Health check failed: {e}",
+                content_type='text/plain',
+                status=500
+            )
     
     async def start(self) -> None:
         """Start the HTTP server."""
@@ -122,5 +155,12 @@ async def stop_metrics_server() -> None:
     """Stop metrics server if running."""
     global metrics_server
     if metrics_server:
-        await metrics_server.stop()
-        metrics_server = None
+        try:
+            await metrics_server.stop()
+            logger = logging.getLogger(__name__)
+            logger.info("Metrics server stopped successfully")
+        except Exception as e:
+            logger = logging.getLogger(__name__)
+            logger.error(f"Error stopping metrics server: {e}")
+        finally:
+            metrics_server = None