perf: 6项性能与正确性优化

1. get_stock_name: 延迟批量保存缓存(60秒去抖)，避免每次新缓存都写文件
2. get_stock_name: 优先从DB stock_realtime_price查name，未命中再调腾讯API
3. compute_comprehensive_score: 单股模式也使用_fund_flow_cache(30分钟TTL)
4. _get_kline_from_local_db: 移除conn.autocommit=True，避免污染连接池事务模式
5. deep_analyze: K线天数从180改为120，与实时检测统一
6. detect_all_signals: 已有指标列时跳过重复calc_all_indicators

stock-html/services/stock_service.py

@@ -7,11 +7,16 @@ from datetime import datetime, timedelta
 import traceback
 import json
 import os
+import time
+import threading
 from config import Config
 
 
 # ========== 股票名称缓存 ==========
 _stock_name_cache = {}
+_name_cache_dirty = False
+_name_cache_last_save = 0.0
+_name_cache_lock = threading.Lock()
 
 
 def _load_stock_name_cache():
@@ -26,23 +31,51 @@ def _load_stock_name_cache():
         print(f"加载股票名称缓存失败: {e}")
 
 
-def _save_stock_name_cache():
-    """保存股票名称缓存到本地"""
-    try:
-        with open(Config.STOCK_NAME_CACHE_FILE, 'w', encoding='utf-8') as f:
-            json.dump(_stock_name_cache, f, ensure_ascii=False, indent=2)
-    except Exception as e:
-        print(f"保存股票名称缓存失败: {e}")
+def _save_stock_name_cache(force=False):
+    """保存股票名称缓存到本地（延迟批量保存，60秒去抖）"""
+    global _name_cache_dirty, _name_cache_last_save
+    if not force and not _name_cache_dirty:
+        return
+    now = time.time()
+    if not force and (now - _name_cache_last_save) < 60:
+        return
+    with _name_cache_lock:
+        try:
+            with open(Config.STOCK_NAME_CACHE_FILE, 'w', encoding='utf-8') as f:
+                json.dump(_stock_name_cache, f, ensure_ascii=False, indent=2)
+            _name_cache_dirty = False
+            _name_cache_last_save = now
+        except Exception as e:
+            print(f"保存股票名称缓存失败: {e}")
 
 
 def get_stock_name(stock_code):
-    """获取股票名称 — 使用腾讯财经API"""
-    global _stock_name_cache
-    
+    """获取股票名称 — 优先内存缓存 → DB stock_realtime_price → 腾讯财经API"""
+    global _stock_name_cache, _name_cache_dirty
+
     if stock_code in _stock_name_cache:
         return _stock_name_cache[stock_code]
-    
-    # 腾讯财经API获取股票名称
+
+    # 优先从数据库 stock_realtime_price 表查（毫秒级）
+    try:
+        from db import get_db, put_db
+        conn = get_db()
+        if conn:
+            try:
+                with conn.cursor() as cur:
+                    cur.execute("SELECT name FROM stock_realtime_price WHERE code = %s", (stock_code,))
+                    row = cur.fetchone()
+                    if row and row[0]:
+                        _stock_name_cache[stock_code] = row[0]
+                        _name_cache_dirty = True
+                        _save_stock_name_cache()
+                        return row[0]
+            finally:
+                put_db(conn)
+    except Exception:
+        pass
+
+    # 回退到腾讯财经API
     try:
         import requests as _req
         tcode = ('sh' if stock_code.startswith('6') else 'bj' if stock_code.startswith(('8', '9')) else 'sz') + stock_code
@@ -52,11 +85,12 @@ def get_stock_name(stock_code):
             _fields = _r.text.split('\"')[1].split('~')
             if len(_fields) > 2 and _fields[1]:
                 _stock_name_cache[stock_code] = _fields[1]
+                _name_cache_dirty = True
                 _save_stock_name_cache()
                 return _fields[1]
     except Exception as e:
         print(f"获取股票名称失败(腾讯): {e}")
-    
+
     return None