feat: 添加原始话题 ID 支持，优化消息保存逻辑以处理用户话题切换

src/gateway/execution.rs

@@ -38,6 +38,7 @@ pub(crate) struct FinalizeAgentResultRequest<'a> {
     pub(crate) metadata: &'a HashMap<String, String>,
     pub(crate) suppress_live_tool_calls: bool,
     pub(crate) execution_kind: &'a str,
+    pub(crate) original_topic_id: Option<String>,
 }
 
 pub(crate) struct FinalizedAgentResult {
@@ -78,10 +79,14 @@ impl AgentExecutionService {
         session: &mut Session,
         request: FinalizeAgentResultRequest<'_>,
     ) -> Result<FinalizedAgentResult, AgentError> {
-        if !session.matches_current_user_turn(request.chat_id, request.user_message) {
+        // 检查是否是最新的用户回合
+        let is_current_turn =
+            session.matches_current_user_turn(request.chat_id, request.user_message);
+
+        if !is_current_turn {
             let (latest_user_id, latest_user_preview, compression_in_flight, history_len) =
                 session.stale_result_diagnostics(request.chat_id);
-            tracing::warn!(
+            tracing::info!(
                 channel = %request.channel_name,
                 chat_id = %request.chat_id,
                 user_message_id = %request.user_message.id,
@@ -90,19 +95,38 @@ impl AgentExecutionService {
                 compression_in_flight,
                 history_len,
                 execution_kind = %request.execution_kind,
-                "Skipping stale agent result because a newer user message is already present"
+                original_topic_id = ?request.original_topic_id,
+                "User switched topic during agent execution - saving result to original topic"
             );
-
-            return Ok(FinalizedAgentResult {
-                outbound_messages: Vec::new(),
-                should_schedule_compaction: false,
-            });
         }
 
-        session
+        // 确定保存消息的话题 ID
-            .append_persisted_messages(request.chat_id, request.result.emitted_messages.clone())?;
+        // 如果是最新回合，使用当前话题；否则使用原始话题
+        let target_topic_id = if is_current_turn {
+            session.current_topic(request.chat_id)
+        } else {
+            request.original_topic_id.as_deref()
+        };
 
-        let outbound_messages = request
+        // 将结果消息保存到确定的话题
+        if let Some(topic_id) = target_topic_id {
+            if let Err(err) = session.append_messages_to_topic(
+                request.chat_id,
+                topic_id,
+                &request.result.emitted_messages,
+            ) {
+                tracing::error!(
+                    error = %err,
+                    topic_id = %topic_id,
+                    "Failed to append messages to topic"
+                );
+            }
+        }
+
+        // 只有当是最新回合时才发送 outbound 消息给用户
+        // 如果用户已经切换到其他话题，只保存结果，不发送消息（避免打扰）
+        let outbound_messages = if is_current_turn {
+            request
                 .result
                 .emitted_messages
                 .iter()
@@ -120,11 +144,17 @@ impl AgentExecutionService {
                         message,
                     )
                 })
-            .collect();
+                .collect()
+        } else {
+            Vec::new()
+        };
+
+        // 只有当是最新回合时才触发历史压缩
+        let should_schedule_compaction = is_current_turn;
 
         Ok(FinalizedAgentResult {
             outbound_messages,
-            should_schedule_compaction: true,
+            should_schedule_compaction,
         })
     }
 
@@ -132,7 +162,7 @@ impl AgentExecutionService {
         &self,
         request: MessageExecutionRequest<'_>,
     ) -> Result<Vec<OutboundMessage>, AgentError> {
-        let (history, agent, user_message, user_message_count) = {
+        let (history, agent, user_message, user_message_count, original_topic_id) = {
             let mut session_guard = request.session.lock().await;
 
             session_guard.ensure_persistent_session(request.chat_id)?;
@@ -156,6 +186,11 @@ impl AgentExecutionService {
             let history_before = session_guard.get_or_create_history(request.chat_id).clone();
             let user_message_count = history_before.iter().filter(|m| m.role == "user").count();
 
+            // 在添加用户消息前，记录当前话题 ID
+            let original_topic_id = session_guard
+                .current_topic(request.chat_id)
+                .map(|s| s.to_string());
+
             let user_message = session_guard.create_user_message(&enriched_content, media_refs);
             session_guard.append_persisted_message(request.chat_id, user_message.clone())?;
 
@@ -172,7 +207,7 @@ impl AgentExecutionService {
                 agent = agent.with_emitted_message_handler(handler);
             }
 
-            (history, agent, user_message, user_message_count)
+            (history, agent, user_message, user_message_count, original_topic_id)
         };
 
         // 构建系统提示词上下文
@@ -195,6 +230,7 @@ impl AgentExecutionService {
                 metadata: &metadata,
                 suppress_live_tool_calls: request.live_emitter.is_some(),
                 execution_kind: "message",
+                original_topic_id,
             },
         )
         .await
@@ -204,7 +240,7 @@ impl AgentExecutionService {
         &self,
         request: ScheduledExecutionRequest<'_>,
     ) -> Result<Vec<OutboundMessage>, AgentError> {
-        let (history, agent, user_message, user_message_count) = {
+        let (history, agent, user_message, user_message_count, original_topic_id) = {
             let mut session_guard = request.session.lock().await;
 
             session_guard.ensure_persistent_session(request.chat_id)?;
@@ -230,6 +266,11 @@ impl AgentExecutionService {
             let history_before = session_guard.get_or_create_history(request.chat_id).clone();
             let user_message_count = history_before.iter().filter(|m| m.role == "user").count();
 
+            // 在添加用户消息前，记录当前话题 ID
+            let original_topic_id = session_guard
+                .current_topic(request.chat_id)
+                .map(|s| s.to_string());
+
             let user_message = session_guard.create_user_message(request.prompt, Vec::new());
             session_guard.append_persisted_message(request.chat_id, user_message.clone())?;
 
@@ -245,7 +286,7 @@ impl AgentExecutionService {
                 request.provider_config.clone(),
             )?;
 
-            (history, agent, user_message, user_message_count)
+            (history, agent, user_message, user_message_count, original_topic_id)
         };
 
         // 构建系统提示词上下文
@@ -267,6 +308,7 @@ impl AgentExecutionService {
                 metadata: request.metadata,
                 suppress_live_tool_calls: false,
                 execution_kind: "scheduled_task",
+                original_topic_id,
             },
         )
         .await

src/gateway/session.rs

@@ -305,6 +305,16 @@ impl Session {
         self.history.append_persisted_messages(chat_id, messages)
     }
 
+    /// 将消息保存到指定话题（直接写入数据库，不更新内存历史）
+    pub fn append_messages_to_topic(
+        &self,
+        chat_id: &str,
+        topic_id: &str,
+        messages: &[ChatMessage],
+    ) -> Result<(), AgentError> {
+        self.history.append_to_topic(chat_id, topic_id, messages)
+    }
+
     pub fn create_user_message(&self, content: &str, media_refs: Vec<String>) -> ChatMessage {
         if media_refs.is_empty() {
             ChatMessage::user(content)

src/gateway/session_history.rs

@@ -212,6 +212,27 @@ impl SessionHistory {
         Ok(())
     }
 
+    /// 将消息保存到指定话题（直接写入数据库，不更新内存历史）
+    /// 用于异步执行结果保存到原始话题的场景
+    pub(crate) fn append_to_topic(
+        &self,
+        chat_id: &str,
+        topic_id: &str,
+        messages: &[ChatMessage],
+    ) -> Result<(), AgentError> {
+        let session_id = self.persistent_session_id(chat_id);
+
+        for message in messages {
+            self.conversations
+                .append_message_with_topic(&session_id, Some(topic_id), message)
+                .map_err(|err| {
+                    AgentError::Other(format!("append message to topic error: {}", err))
+                })?;
+        }
+
+        Ok(())
+    }
+
     pub(crate) fn latest_user_message(&self, chat_id: &str) -> Option<&ChatMessage> {
         self.get_history(chat_id)
             .and_then(|history| history.iter().rev().find(|message| message.role == "user"))