diff --git a/db/message_storage.py b/db/message_storage.py
index ec5f4b6..234114c 100644
--- a/db/message_storage.py
+++ b/db/message_storage.py
@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 
 from datetime import datetime
+import json
 from typing import Dict, List, Optional
 
 from db.base import BaseDBOperator
@@ -15,18 +16,76 @@ class MessageStorageDB(BaseDBOperator):
         super().__init__(db_manager)
 
     def archive_message(self, msg: WxMessage) -> bool:
-        """存档消息"""
+        """存档消息
+
+        说明：
+        1. 结构化字段（content/message_type/message_xml 等）继续保留，便于高频查询；
+        2. 新增 raw_payload 字段，落盘 API 原始消息的完整序列化内容，便于后续排障与二次特征提取；
+        3. 为兼容尚未升级表结构的老环境，先尝试新 SQL，失败后自动回退旧 SQL。
+        """
         now_time = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
-        sql = """
-        INSERT INTO messages (group_id, timestamp, sender, content, message_type, attachment_url, message_id, message_xml, message_thumb)
+        # 先准备好可复用字段，避免在两套 SQL 中重复拼接业务字段。
+        base_params = (
+            msg.roomid,
+            now_time,
+            msg.sender,
+            str(msg.content.clean_content),
+            msg.msg_type.value,
+            str(msg.content.xml_content),
+            msg.msg_id,
+            msg.msg_source,
+            "",
+        )
+
+        # 尽可能保存完整原始负载：优先使用对象自带序列化能力，其次兜底到 __dict__。
+        raw_payload = self._serialize_raw_payload(msg)
+
+        sql_with_raw_payload = """
+        INSERT INTO messages (
+            group_id, timestamp, sender, content, message_type,
+            attachment_url, message_id, message_xml, raw_payload, message_thumb
+        )
+        VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
+        """
+        params_with_raw_payload = (*base_params[:8], raw_payload, base_params[8])
+        if self.execute_update(sql_with_raw_payload, params_with_raw_payload):
+            return True
+
+        # 兼容旧表结构：如果线上还没执行 ALTER TABLE，加列前仍可继续正常归档。
+        sql_legacy = """
+        INSERT INTO messages (
+            group_id, timestamp, sender, content, message_type,
+            attachment_url, message_id, message_xml, message_thumb
+        )
         VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s)
         """
-        params = (
-            msg.roomid, now_time, msg.sender, str(msg.content.clean_content), msg.msg_type.value,
-            str(msg.content.xml_content), msg.msg_id,
-            msg.msg_source, "")
-        result = self.execute_update(sql, params)
-        return result
+        return self.execute_update(sql_legacy, base_params)
+
+    def _serialize_raw_payload(self, msg: WxMessage) -> str:
+        """将消息对象尽量完整地序列化为 JSON 字符串。
+
+        序列化优先级（从高到低）：
+        1. pydantic v2: model_dump_json
+        2. pydantic v1: json
+        3. 自定义方法: to_json
+        4. 通用兜底: __dict__
+
+        说明：
+        - 不做脱敏，按用户要求保存完整信息；
+        - 使用 ensure_ascii=False 保留中文原文，便于后续排查。
+        """
+        try:
+            if hasattr(msg, "model_dump_json") and callable(getattr(msg, "model_dump_json")):
+                return msg.model_dump_json(exclude_none=False)
+            if hasattr(msg, "json") and callable(getattr(msg, "json")):
+                return msg.json(ensure_ascii=False)
+            if hasattr(msg, "to_json") and callable(getattr(msg, "to_json")):
+                raw_text = msg.to_json()
+                return raw_text if isinstance(raw_text, str) else json.dumps(raw_text, ensure_ascii=False, default=str)
+            return json.dumps(getattr(msg, "__dict__", {"repr": str(msg)}), ensure_ascii=False, default=str)
+        except Exception:
+            # 最后的保底策略：即使序列化失败，也确保字段有可追溯文本，避免丢失原始上下文。
+            return str(msg)
 
     def get_recent_messages(self, group_id: str, hours_ago: int = 8, min_content_length: int = 6) -> List[Dict]:
         """获取最近的消息"""
diff --git a/db/scripts/init.sql b/db/scripts/init.sql
index 5f3e123..dfe804b 100644
--- a/db/scripts/init.sql
+++ b/db/scripts/init.sql
@@ -39,6 +39,7 @@ create or replace table message_archive.messages
     attachment_url text         null comment '附件URL（图片、视频链接）',
     message_id     varchar(32)  null comment '消息 id',
     message_xml    text         null comment '消息 xml 部分',
+    raw_payload    longtext     null comment 'API 原始消息完整负载（完整序列化数据）',
     message_thumb  longtext     null comment '视频或图片消息的缩略图路径',
     image_path     varchar(255) null comment '图片URL路径'
 )
diff --git a/db/scripts/migrations/20260421_add_raw_payload_to_messages.sql b/db/scripts/migrations/20260421_add_raw_payload_to_messages.sql
new file mode 100644
index 0000000..c397f1b
--- /dev/null
+++ b/db/scripts/migrations/20260421_add_raw_payload_to_messages.sql
@@ -0,0 +1,3 @@
+-- 为 messages 表新增 raw_payload 字段，用于存储 API 原始消息完整负载
+ALTER TABLE message_archive.messages
+    ADD COLUMN IF NOT EXISTS raw_payload LONGTEXT NULL COMMENT 'API 原始消息完整负载（完整序列化数据）' AFTER message_xml;