added delete option

src/server/services/websocket_service.py

@@ -651,9 +651,9 @@ class WebSocketService:
 
     async def shutdown(self, timeout: float = 5.0) -> None:
         """Gracefully shutdown the WebSocket service.
-        
+
         Broadcasts shutdown notification and closes all connections.
-        
+
         Args:
             timeout: Maximum time (seconds) to wait for shutdown
         """
@@ -661,6 +661,34 @@ class WebSocketService:
         await self._manager.shutdown(timeout=timeout)
         logger.info("WebSocket service shutdown complete")
 
+    async def broadcast_series_deleted(
+        self,
+        key: str,
+        name: str,
+    ) -> None:
+        """Broadcast a series_deleted event to all connected clients.
+
+        Notifies clients that a series has been deleted so they can
+        remove it from their UI in real-time.
+
+        Args:
+            key: Series key that was deleted (primary identifier)
+            name: Series name for display purposes
+        """
+        message = {
+            "type": "series_deleted",
+            "timestamp": datetime.now(timezone.utc).isoformat(),
+            "data": {
+                "key": key,
+                "name": name,
+            },
+        }
+        await self._manager.broadcast(message)
+        logger.info(
+            "Broadcast series_deleted key=%s name=%s",
+            key, name,
+        )
+
 
 # Singleton instance for application-wide access
 _websocket_service: Optional[WebSocketService] = None