diff --git a/backend/ai-core/internal/context/builder.go b/backend/ai-core/internal/context/builder.go
index e527b74..fd39f82 100644
--- a/backend/ai-core/internal/context/builder.go
+++ b/backend/ai-core/internal/context/builder.go
@@ -67,9 +67,9 @@ func (cs *ConversationStore) AddMessage(sessionID string, msg model.LLMMessage)
     }
     cs.messages[sessionID] = msgs
 
-    // 异步写 DB 确保重启后上下文不丢失
+    // 同步写 DB 确保进程被杀前消息已持久化
     if cs.databaseURL != "" {
-        go cs.saveToDB(sessionID, msg)
+        cs.saveToDB(sessionID, msg)
     }
 }