fix: fallback quoted image lookup by md5

db/message_storage.py

@@ -73,6 +73,21 @@ class MessageStorageDB(BaseDBOperator):
         """
         return self.execute_query(sql, (message_id,), fetch_one=True)
 
+    def get_image_message_by_md5(self, md5: str) -> Optional[Dict]:
+        """根据图片消息 attachment_url 中的 md5 反查原图消息"""
+        sql = """
+        SELECT id, group_id, timestamp, sender, content, message_type,
+               attachment_url, message_id, message_xml, message_thumb, image_path
+        FROM messages
+        WHERE message_type = 3
+          AND attachment_url IS NOT NULL
+          AND attachment_url <> ''
+          AND attachment_url LIKE %s
+        ORDER BY id DESC
+        LIMIT 1
+        """
+        return self.execute_query(sql, (f'%md5="{md5}"%',), fetch_one=True)
+
     def get_member_recent_messages(self, group_id: str, wxid: str, days: int = 30,
                                    limit: int = 200, include_today: bool = True) -> List[Dict]:
         """获取指定群成员近期消息"""