优化连接流程：connect_from_source自动处理订阅，简化main.rs

src/connection.rs

@@ -395,7 +395,13 @@ impl ConnectionManager {
             source.username.as_deref(),
             source.password.as_deref(),
         )
-        .await
+        .await?;
+
+        // Subscribe to points for this source
+        self.subscribe_points_from_source(source_id, None, pool)
+            .await?;
+
+        Ok(())
     }
 
     pub async fn connect(

src/main.rs

@@ -62,17 +62,9 @@ async fn main() {
         let source_id = source.id;
 
         let task = tokio::spawn(async move {
-            match cm.connect_from_source(&p, source_id).await {
-                Ok(_) => {
-                    // Subscribe to points for this source
-                    if let Err(e) = cm.subscribe_points_from_source(source_id, None, &p).await {
-                        tracing::error!("Failed to subscribe to points for source {}: {}", source_name, e);
-                    }
-                }
-                Err(e) => {
+            if let Err(e) = cm.connect_from_source(&p, source_id).await {
                 tracing::error!("Failed to connect to source {}: {}", source_name, e);
             }
-            }
         });
 
         tasks.push(task);