From 9be6f156c7b54cf2ac586ee497255dfca710fe75 Mon Sep 17 00:00:00 2001
From: Justin Gu <97915@qq.com>
Date: Sat, 5 Sep 2026 11:42:05 +0800
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board-mac/hotspot-correlation 的入阵板块来自 set 的并集，
sorted(days_in, key=-days_in) 在上榜次数并列时保持 set 迭代序，
而字符串哈希随机化（PYTHONHASHSEED）使该顺序跨进程不稳定——
服务每次重启矩阵的行/列都可能互换（全量单测中按哈希种子复现）。

排序加 code 兜底使其确定性；热点矩阵 rows_out 的多级排序同样
补 code 兜底（全并列时此前也受 set 序影响）。
---
 src/easy_tdx/web/routers/board_mac.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/easy_tdx/web/routers/board_mac.py b/src/easy_tdx/web/routers/board_mac.py
index f6f837f..b0aca23 100644
--- a/src/easy_tdx/web/routers/board_mac.py
+++ b/src/easy_tdx/web/routers/board_mac.py
@@ -491,6 +491,7 @@ async def board_hotspot(
             -r["days_in"],
             -(r["sum_pct"] or 0.0),
             r["best_rank"] if r["best_rank"] else 9999,
+            r["code"],  # 全并列时按代码兜底：candidates 来自 set，迭代序跨进程不稳定
         )
     )
     rows_out = rows_out[:_HOTSPOT_MAX_ROWS]
@@ -552,7 +553,9 @@ async def board_hotspot_correlation(
         for c in s:
             days_in[c] = days_in.get(c, 0) + 1
 
-    chosen = sorted(days_in, key=lambda c: -days_in[c])[:top]
+    # 排序必须确定性：days_in 并列时按代码兜底——set 迭代序受哈希随机化影响，
+    # 跨进程不稳定，会导致相关矩阵行列顺序在服务重启后随机互换
+    chosen = sorted(days_in, key=lambda c: (-days_in[c], c))[:top]
     if len(chosen) < 2:
         return DictResponse.from_dict(
             {"status": "ready", "boards": [], "matrix": [], "days": len(window)}