数据新鲜度校验: 所有模块加上日期/时效检查

1. search_cache.json → 添加 _metadata.updated_at 时间戳
   web_search.search_from_cache() 跳过超过36h的旧缓存
   防止某查询失败时残留旧数据

2. metrics_feedback.json → collector 检查mtime,超过24h不采用

3. trends.json → 已有 date==TODAY 校验(load_trends)

4. collector_ai_advice → DB每日覆盖,时序安全
   creator→topic状态位避免重复生成
   optimizer→文章状态位避免重复审查

scripts/web_search.py

@@ -7,7 +7,7 @@
 2. Bing Web Search API（设 BING_API_KEY）
 3. Bing 网页抓取（服务器环境常反爬拦截）
 """
-import json, logging, os, re
+import json, logging, os, re, datetime
 from pathlib import Path
 from typing import List, Dict, Optional
 from urllib.parse import quote_plus
@@ -92,11 +92,21 @@ def search_scrape(query: str, max_results: int = 5) -> List[Dict]:
 
 
 def search_from_cache(query: str, max_results: int = 5) -> List[Dict]:
-    """从 opencode webfetch 预填充的缓存中读取"""
+    """从 opencode webfetch 预填充的缓存中读取（跳过超过36小时的缓存）"""
     if not SEARCH_CACHE_FILE.exists():
         return []
     try:
         cache = json.loads(SEARCH_CACHE_FILE.read_text(encoding="utf-8"))
+        meta = cache.get("_metadata", {})
+        updated = meta.get("updated_at", "")
+        if updated:
+            try:
+                age = (datetime.datetime.now() - datetime.datetime.fromisoformat(updated)).total_seconds()
+                if age > 129600:  # 36h
+                    logger.warning("搜索缓存过时(%dh)，跳过", int(age // 3600))
+                    return []
+            except Exception:
+                pass
         results = cache.get(query, [])
         return results[:max_results]
     except Exception: