docs: add /deb command, accuracy tracking, auto-cleanup to both READMEs

README.md

@@ -19,7 +19,8 @@ The system automatically tracks the historical performance of weather models (EC
 - **Error-Based Weighting**: Dynamically adjusts model weights based on their Mean Absolute Error (MAE) over the past 7 days. Lower error = higher weight.
 - **Blended Forecast**: Provides a bias-corrected "DEB Blended High Temperature" recommendation.
 - **Self-Learning**: Requires at least 2 days of observations before activating weight differentiation. Uses equal-weight averaging during cold start.
-- **Concurrency Safe**: Built-in memory cache and file locking (fcntl) for high-concurrency group chat queries.
+- **Accuracy Tracking**: Use the `/deb` command to view DEB's historical WU settlement hit rate and MAE, compared against individual models.
+- **Auto-Cleanup**: Only retains the last 14 days of records to prevent unbounded data growth.
 
 ### 2. 🎲 Math Probability Engine (Settlement Probability)
 
@@ -93,6 +94,7 @@ chmod +x ~/update.sh
 | Command             | Description                                                                      |
 | :------------------ | :------------------------------------------------------------------------------- |
 | `/city [city_name]` | Get weather analysis, settlement probabilities, METAR tracking, and AI insights. |
+| `/deb [city_name]`  | View DEB blended forecast accuracy (WU hit rate, MAE) and model comparison.      |
 | `/id`               | View the Chat ID of the current conversation.                                    |
 | `/help`             | Display help information.                                                        |
 
@@ -148,4 +150,4 @@ graph TD
 
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-_Updated 2026-02-27_
+_Updated 2026-03-01_

README_ZH.md

@@ -19,7 +19,8 @@ PolyWeather 是一款专为 **Polymarket** 等预测市场打造的天气分析
 - **误差加权**：根据过去 7 天的平均绝对误差（MAE），动态调整各模型的权重。误差越小的模型，话语权越大。
 - **融合预报**：给出经过历史偏差修正后的"DEB 融合最高温"建议值。
 - **自学习机制**：系统需要至少 2 天的实测记录才会启动权重分化。冷启动期间以等权平均过渡。
-- **并发优化**：内置内存缓存与文件锁 (fcntl)，支持高并发群聊查询。
+- **准确率追踪**：通过 `/deb` 命令查看 DEB 融合预测的历史 WU 结算命中率和 MAE，并与各个单一模型对比。
+- **自动清理**：只保留最近 14 天的记录，防止数据无限增长。
 
 ### 2. 🎲 数学概率引擎 (Settlement Probability)
 
@@ -90,11 +91,12 @@ chmod +x ~/update.sh
 
 ## 🕹️ 机器人指令
 
-| 指令             | 说明                                                 |
-| :--------------- | :--------------------------------------------------- |
-| `/city [城市名]` | 获取深度气象分析、结算概率、实测追踪及 AI 决策建议。 |
-| `/id`            | 查看当前对话的 Chat ID。                             |
-| `/help`          | 显示说明信息。                                       |
+| 指令             | 说明                                                        |
+| :--------------- | :---------------------------------------------------------- |
+| `/city [城市名]` | 获取深度气象分析、结算概率、实测追踪及 AI 决策建议。        |
+| `/deb [城市名]`  | 查看 DEB 融合预测的历史准确率（WU 命中率、MAE）和模型对比。 |
+| `/id`            | 查看当前对话的 Chat ID。                                    |
+| `/help`          | 显示说明信息。                                              |
 
 ### 支持城市示例
 
@@ -148,4 +150,4 @@ graph TD
 
 ---
 
-_更新于 2026-02-27_
+_更新于 2026-03-01_