diff --git a/okx-auto-position/scripts/process_signal.py b/okx-auto-position/scripts/process_signal.py
index f6bbf74..3df90bf 100644
--- a/okx-auto-position/scripts/process_signal.py
+++ b/okx-auto-position/scripts/process_signal.py
@@ -55,8 +55,9 @@ def parse_signal(text):
             if m_first and m_first.group(1) not in FIELD_NAMES:
                 fields['trader'] = m_first.group(1).strip()
             else:
-                # 实在找不到 → 标 "unknown",不强行填空
-                fields['trader'] = 'unknown'
+                # 实在找不到 trader 标签 — 默认 X聚合社区 (用户 TG 唯一信号源)
+                # 比 "unknown" 更有用, 用户能立刻知道源头
+                fields['trader'] = 'X聚合社区'
 
     # 字段映射
     extractors = {