From 305e2e7a6b593650bf95f50b2b3032ee64790840 Mon Sep 17 00:00:00 2001
From: "2569718930@qq.com" <2569718930@qq.com>
Date: Fri, 27 Feb 2026 22:08:13 +0800
Subject: [PATCH] feat: auto-prune DEB records older than 14 days to prevent
 unbounded growth

---
 src/analysis/deb_algorithm.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/analysis/deb_algorithm.py b/src/analysis/deb_algorithm.py
index c37d2bc4..db544569 100644
--- a/src/analysis/deb_algorithm.py
+++ b/src/analysis/deb_algorithm.py
@@ -70,6 +70,13 @@ def update_daily_record(city_name, date_str, forecasts, actual_high):
     # 只要仍在更新或者已经结束，都记录最新高点
     data[city_name][date_str]['actual_high'] = actual_high
     
+    # 自动清理：只保留最近 14 天的记录（DEB 只用 7 天，14 天留足余量）
+    cutoff = (datetime.now() - timedelta(days=14)).strftime("%Y-%m-%d")
+    for city in list(data.keys()):
+        old_dates = [d for d in data[city] if d < cutoff]
+        for d in old_dates:
+            del data[city][d]
+    
     save_history(history_file, data)
 
 def calculate_dynamic_weights(city_name, current_forecasts, lookback_days=7):