重构ConnectionManager：简化get_session方法，移除pool依赖，重命名new_with_pool为new

src/connection.rs

@@ -105,7 +105,6 @@ 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>>>,
-    pool: Option<sqlx::PgPool>,
     event_manager: Option<std::sync::Arc<crate::event::EventManager>>,
 }
 
@@ -155,10 +154,9 @@ impl ConnectionManager {
         }
     }
 
-    pub fn new_with_pool(pool: sqlx::PgPool) -> Self {
+    pub fn new() -> Self {
         Self {
             status: Arc::new(RwLock::new(HashMap::new())),
-            pool: Some(pool),
             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())),
@@ -562,28 +560,13 @@ impl ConnectionManager {
     }
 
     pub async fn get_session(&self, source_id: Uuid) -> Option<Arc<Session>> {
-        // comment fixed
-        {
-            let status = self.status.read().await;
-            if let Some(conn_status) = status.get(&source_id) {
-                if conn_status.is_connected {
-                    return conn_status.session.clone();
-                }
+        let status = self.status.read().await;
+        if let Some(conn_status) = status.get(&source_id) {
+            if conn_status.is_connected {
+                return conn_status.session.clone();
             }
         }
-
-        // comment fixed
-        if let Some(pool) = &self.pool {
-            if let Ok(()) = self.connect_from_source(pool, source_id).await {
-                // comment fixed
-                let status = self.status.read().await;
-                status.get(&source_id).and_then(|s| s.session.clone())
-            } else {
-                None
-            }
-        } else {
-            None
-        }
+        None
     }
 
     pub async fn get_status(&self, source_id: Uuid) -> Option<ConnectionStatusView> {

src/main.rs

@@ -38,7 +38,7 @@ async fn main() {
     let config = AppConfig::from_env().expect("Failed to load configuration");
     let pool = init_database(&config.database_url).await.expect("Failed to initialize database");
 
-    let mut connection_manager = ConnectionManager::new_with_pool(pool.clone());
+    let mut connection_manager = ConnectionManager::new();
     let ws_manager = Arc::new(websocket::WebSocketManager::new());
     let event_manager = Arc::new(EventManager::new(
         pool.clone(),