重构：将 poll_task_handles 和 poll_points 合并为一个双向映射，使用 PollPointInfo 结构

src/connection.rs

@@ -59,7 +59,33 @@ struct PointWriteTarget {
     external_id: String,
 }
 
-#[derive(Clone)]
+struct PollPointInfo {
+    handle: JoinHandle<()>,
+    external_id: String,
+    interval_s: i32,
+}
+
+#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
+pub struct ConnectionStatusView {
+    pub is_connected: bool,
+    pub last_error: Option<String>,
+    pub last_time: DateTime<Utc>,
+    pub subscription_id: Option<u32>,
+    pub next_client_handle: u32,
+}
+
+impl From<&ConnectionStatus> for ConnectionStatusView {
+    fn from(status: &ConnectionStatus) -> Self {
+        Self {
+            is_connected: status.is_connected,
+            last_error: status.last_error.clone(),
+            last_time: status.last_time,
+            subscription_id: status.subscription_id,
+            next_client_handle: status.next_client_handle,
+        }
+    }
+}
+
 pub struct ConnectionStatus {
     pub session: Option<Arc<Session>>,
     pub is_connected: bool,
@@ -69,7 +95,7 @@ pub struct ConnectionStatus {
     pub next_client_handle: u32,
     pub client_handle_map: HashMap<u32, Uuid>, // client_handle -> point_id
     pub monitored_item_map: HashMap<Uuid, u32>, // point_id -> monitored_item_id
-    pub poll_points: HashSet<Uuid>, // 正在轮询的点集合
+    pub poll_points: HashMap<Uuid, PollPointInfo>, // 正在轮询的点集合
 }
 
 #[derive(Clone)]
@@ -78,7 +104,6 @@ pub struct ConnectionManager {
     point_monitor_data: Arc<RwLock<HashMap<Uuid, PointMonitorInfo>>>,
     point_history_data: Arc<RwLock<HashMap<Uuid, VecDeque<PointMonitorInfo>>>>,
     point_write_target_cache: Arc<RwLock<HashMap<Uuid, PointWriteTarget>>>,
-    poll_task_handles: Arc<RwLock<HashMap<Uuid, JoinHandle<()>>>>,
     pool: Option<sqlx::PgPool>,
     event_manager: Option<std::sync::Arc<crate::event::EventManager>>,
 }
@@ -136,7 +161,6 @@ impl ConnectionManager {
             point_monitor_data: Arc::new(RwLock::new(HashMap::new())),
             point_history_data: Arc::new(RwLock::new(HashMap::new())),
             point_write_target_cache: Arc::new(RwLock::new(HashMap::new())),
-            poll_task_handles: Arc::new(RwLock::new(HashMap::new())),
             event_manager: None,
         }
     }
@@ -217,9 +241,11 @@ impl ConnectionManager {
             .ok_or_else(|| "Event manager is not initialized".to_string())?;
 
         {
-            let poll_tasks = self.poll_task_handles.read().await;
-            if poll_tasks.contains_key(&point.point_id) {
-                return Ok(());
+            let status = self.status.read().await;
+            if let Some(conn_status) = status.get(&source_id) {
+                if conn_status.poll_points.contains_key(&point.point_id) {
+                    return Ok(());
+                }
             }
         }
 
@@ -294,14 +320,17 @@ impl ConnectionManager {
             }
         });
 
-        {
-            let mut poll_tasks = self.poll_task_handles.write().await;
-            poll_tasks.insert(point_id, handle);
-        }
         {
             let mut status = self.status.write().await;
             if let Some(conn_status) = status.get_mut(&source_id) {
-                conn_status.poll_points.insert(point_id);
+                conn_status.poll_points.insert(
+                    point_id,
+                    PollPointInfo {
+                        handle,
+                        external_id: point.external_id.clone(),
+                        interval_s: point.scan_interval_s,
+                    },
+                );
             }
         }
 
@@ -309,18 +338,16 @@ impl ConnectionManager {
     }
 
     async fn stop_polling_for_point(&self, point_id: Uuid) {
-        if let Some(handle) = self.poll_task_handles.write().await.remove(&point_id) {
-            handle.abort();
-        }
-
         let mut status = self.status.write().await;
         for conn_status in status.values_mut() {
-            conn_status.poll_points.remove(&point_id);
+            if let Some(poll_info) = conn_status.poll_points.remove(&point_id) {
+                poll_info.handle.abort();
+            }
         }
     }
 
     async fn stop_polling_for_source(&self, source_id: Uuid) {
-        let point_ids = {
+        let poll_infos = {
             let mut status = self.status.write().await;
             status
                 .get_mut(&source_id)
@@ -328,15 +355,12 @@ impl ConnectionManager {
                 .unwrap_or_default()
         };
 
-        if point_ids.is_empty() {
+        if poll_infos.is_empty() {
             return;
         }
 
-        let mut poll_tasks = self.poll_task_handles.write().await;
-        for point_id in point_ids {
-            if let Some(handle) = poll_tasks.remove(&point_id) {
-                handle.abort();
-            }
+        for (_, poll_info) in poll_infos {
+            poll_info.handle.abort();
         }
     }
 
@@ -483,7 +507,7 @@ impl ConnectionManager {
                 next_client_handle: 1000,
                 client_handle_map: HashMap::new(),
                 monitored_item_map: HashMap::new(),
-                poll_points: HashSet::new(),
+                poll_points: HashMap::new(),
             },
         );
 
@@ -504,7 +528,7 @@ impl ConnectionManager {
                 client_handle_map: HashMap::new(),
                 monitored_item_map: HashMap::new(),
                 next_client_handle: 1000,
-                poll_points: HashSet::new(),
+                poll_points: HashMap::new(),
             },
         );
     }
@@ -566,14 +590,14 @@ impl ConnectionManager {
         }
     }
 
-    pub async fn get_status(&self, source_id: Uuid) -> Option<ConnectionStatus> {
+    pub async fn get_status(&self, source_id: Uuid) -> Option<ConnectionStatusView> {
         let status = self.status.read().await;
-        status.get(&source_id).cloned()
+        status.get(&source_id).map(ConnectionStatusView::from)
     }
 
-    pub async fn get_all_status(&self) -> Vec<(Uuid, ConnectionStatus)> {
+    pub async fn get_all_status(&self) -> Vec<(Uuid, ConnectionStatusView)> {
         let status = self.status.read().await;
-        status.iter().map(|(source_id, conn_status)| (*source_id, conn_status.clone())).collect()
+        status.iter().map(|(source_id, conn_status)| (*source_id, ConnectionStatusView::from(conn_status))).collect()
     }
 
     pub async fn write_point_values_batch(