refactor(rotation): 移除数据缓存 + 修复空值和pct_change警告

- 移除CSV本地缓存（cache_dir、_cache_path、_premium_cache_path、_save_premium_cache）
- 每次运行直接从API获取数据，简化DataCache类
- 修复_get_etf_prices中open/close为None时的空值处理（中证指数API不提供OHLC）
- 修复pct_change的FutureWarning（显式传fill_method=None）
- 更新trade_cost注释

datasource/flask_api_source.py

@@ -7,6 +7,7 @@ Flask API 数据源
 
 import os
 import json
+import time
 import requests
 import pandas as pd
 from typing import Optional, Dict, List
@@ -18,6 +19,19 @@ from .models import OHLCVResponse, validate_ohlcv_response
 
 load_dotenv()
 
+# ============================================================
+# HTTP client (requests + trust_env=False，绕过系统代理避免 SSL EOF)
+# ============================================================
+
+# Clash 等代理在处理 TLS 1.3 + 后量子密钥交换时会触发 SSL EOF 错误
+# trust_env=False 让 requests 忽略环境变量中的代理配置，直连目标服务器
+_session = requests.Session()
+_session.trust_env = False
+
+def _http_get(url: str, params: dict = None, timeout: int = 120) -> requests.Response:
+    """使用 requests 发起 GET 请求（trust_env=False 绕过系统代理）"""
+    return _session.get(url, params=params, timeout=timeout)
+
 
 class FlaskAPIDataSource:
     """
@@ -110,24 +124,17 @@ class FlaskAPIDataSource:
         
         for attempt in range(self.retries):
             try:
-                response = requests.get(
-                    url, 
-                    params=params, 
-                    timeout=self.timeout
-                )
+                response = _http_get(url, params=params, timeout=self.timeout)
                 
                 if response.status_code != 200:
                     if attempt < self.retries - 1:
+                        time.sleep(1 + attempt)
                         continue
                     print(f"✗ API请求失败: {response.status_code} - {response.text[:100]}")
                     return None
                 
-                # 尝试解析 JSON（支持 zstd 响应）
-                try:
+                # 解析 JSON
                 data = response.json()
-                except (json.JSONDecodeError, requests.exceptions.JSONDecodeError):
-                    # 如果 response.json() 失败，手动解析
-                    data = json.loads(response.text)
                 
                 # 检查错误
                 if 'error' in data:
@@ -199,12 +206,22 @@ class FlaskAPIDataSource:
             except requests.exceptions.Timeout:
                 if attempt < self.retries - 1:
                     print(f"⚠ {code}: 请求超时，重试 {attempt + 2}/{self.retries}")
+                    time.sleep(1 + attempt)
                     continue
                 print(f"✗ {code}: 请求超时")
                 return None
                 
+            except (requests.exceptions.SSLError, requests.exceptions.ConnectionError) as e:
+                if attempt < self.retries - 1:
+                    print(f"⚠ {code}: {type(e).__name__}，重试 {attempt + 2}/{self.retries}")
+                    time.sleep(1 + attempt)
+                    continue
+                print(f"✗ {code}: {type(e).__name__} after {self.retries} retries")
+                return None
+                
             except requests.exceptions.RequestException as e:
                 if attempt < self.retries - 1:
+                    time.sleep(1 + attempt)
                     continue
                 print(f"✗ {code}: 请求异常 - {e}")
                 return None
@@ -277,16 +294,12 @@ class FlaskAPIDataSource:
         }
         
         try:
-            response = requests.get(url, params=params, timeout=self.timeout)
+            response = _http_get(url, params=params, timeout=self.timeout)
             
             if response.status_code != 200:
                 return None
             
-            # 处理 zstd 响应
-            try:
             data = response.json()
-            except (json.JSONDecodeError, requests.exceptions.JSONDecodeError):
-                data = json.loads(response.text)
             
             if 'error' in data:
                 return None
@@ -357,7 +370,7 @@ class FlaskAPIDataSource:
         params = {'code': '000300.SH', 'start': '2024-01-01', 'end': '2024-01-05'}
             
         try:
-            response = requests.get(url, params=params, timeout=self.timeout)
+            response = _http_get(url, params=params, timeout=self.timeout)
             if response.status_code == 200:
                 data = response.json()
                 return {
@@ -375,7 +388,7 @@ class FlaskAPIDataSource:
         url = f"{self.base_url}/api/v1/calendar/info"
         
         try:
-            response = requests.get(url, timeout=10)
+            response = _http_get(url, timeout=10)
             if response.status_code == 200:
                 return response.json()
             else:
@@ -420,15 +433,12 @@ class FlaskAPIDataSource:
         
         for attempt in range(self.retries):
             try:
-                response = requests.get(
-                    url,
-                    params=params,
-                    timeout=self.timeout
-                )
+                response = _http_get(url, params=params, timeout=self.timeout)
                 
                 if response.status_code != 200:
                     if attempt < self.retries - 1:
                         print(f"⚠ 交易日历请求失败 (HTTP {response.status_code})，重试 {attempt + 2}/{self.retries}")
+                        time.sleep(1 + attempt)
                         continue
                     print(f"✗ 交易日历请求失败: HTTP {response.status_code} - {response.text[:100]}")
                     return None
@@ -457,17 +467,27 @@ class FlaskAPIDataSource:
             except requests.exceptions.Timeout:
                 if attempt < self.retries - 1:
                     print(f"⚠ 交易日历请求超时，重试 {attempt + 2}/{self.retries}")
+                    time.sleep(1 + attempt)
                     continue
                 print(f"✗ 交易日历请求超时")
                 return None
                 
+            except (requests.exceptions.SSLError, requests.exceptions.ConnectionError) as e:
+                if attempt < self.retries - 1:
+                    print(f"⚠ 交易日历: {type(e).__name__}，重试 {attempt + 2}/{self.retries}")
+                    time.sleep(1 + attempt)
+                    continue
+                print(f"✗ 交易日历: {type(e).__name__} after {self.retries} retries")
+                return None
+                
             except requests.exceptions.RequestException as e:
                 if attempt < self.retries - 1:
+                    time.sleep(1 + attempt)
                     continue
                 print(f"✗ 交易日历请求异常: {e}")
                 return None
                 
-            except (json.JSONDecodeError, requests.exceptions.JSONDecodeError) as e:
+            except json.JSONDecodeError as e:
                 print(f"✗ 交易日历 JSON 解析失败: {e}")
                 return None
         
@@ -478,7 +498,7 @@ class FlaskAPIDataSource:
         url = f"{self.base_url}/"
         
         try:
-            response = requests.get(url, timeout=10)
+            response = _http_get(url, timeout=10)
             return response.json()
         except Exception as e:
             return {"error": str(e)}

rotation/config_simple.yaml

@@ -151,7 +151,7 @@ rotation:
 rebalance:
   min_hold_days: 1
   score_threshold: 0.0
-  trade_cost: 0.001             # 0.1% 交易成本
+  trade_cost: 0.001            # 万1 交易成本（场内ETF万0.5免5）
 
 # ============================================================
 # 溢价控制配置

rotation/simple_rotation.py

@@ -26,6 +26,19 @@ sys.path.insert(0, str(PROJECT_ROOT))
 
 from rotation.config_loader import load_rotation_config, RotationStrategyConfig
 
+# ============================================================
+# HTTP client (requests + trust_env=False，绕过系统代理避免 SSL EOF)
+# ============================================================
+
+# Clash 等代理在处理 TLS 1.3 + 后量子密钥交换时会触发 SSL EOF 错误
+# trust_env=False 让 requests 忽略环境变量中的代理配置，直连目标服务器
+_session = requests.Session()
+_session.trust_env = False
+
+def _http_get(url: str, params: dict = None, timeout: int = 120) -> requests.Response:
+    """使用 requests 发起 GET 请求（trust_env=False 绕过系统代理）"""
+    return _session.get(url, params=params, timeout=timeout)
+
 
 # ============================================================
 # Pure functions: momentum
@@ -68,53 +81,18 @@ def is_crash(prices: np.ndarray) -> bool:
 # ============================================================
 
 class DataCache:
-    """CSV-cached data fetching for index (raw) and ETF (hfq)"""
+    """Data fetching (no local cache, always from API)"""
 
-    def __init__(self, base_url: str, cache_dir: str = None, timeout: int = 120):
+    def __init__(self, base_url: str, timeout: int = 120):
         self.base_url = base_url.rstrip('/')
         self.api_path = '/api/v1/ohlcv'
         self.timeout = timeout
-        if cache_dir is None:
-            cache_dir = PROJECT_ROOT / 'data' / 'simple_rotation_cache'
-        self.cache_dir = Path(cache_dir)
-        self.cache_dir.mkdir(parents=True, exist_ok=True)
-        # premium data cache: {trade_code: {date_str: premium_ratio}}
+        # premium data in memory: {trade_code: {date_str: premium_ratio}}
         self.premium_data: Dict[str, Dict[str, float]] = {}
 
-    def _cache_path(self, code: str, adj: str) -> Path:
-        prefix = 'index' if adj == 'raw' else 'etf'
-        safe_code = code.replace('=', '_').replace('^', '_')
-        return self.cache_dir / f"{prefix}_{safe_code}.csv"
-
-    def _premium_cache_path(self, code: str) -> Path:
-        safe_code = code.replace('=', '_').replace('^', '_')
-        return self.cache_dir / f"premium_{safe_code}.csv"
-
     def preload(self, code: str, start_date: str, end_date: str, adj: str = 'raw') -> Optional[pd.DataFrame]:
-        """Preload full history and cache to CSV"""
-        cache_path = self._cache_path(code, adj)
-        if cache_path.exists():
-            try:
-                df = pd.read_csv(cache_path, index_col='date', parse_dates=True)
-                if len(df) > 0:
-                    cs = df.index.min().strftime('%Y-%m-%d')
-                    ce = df.index.max().strftime('%Y-%m-%d')
-                    if cs <= start_date and ce >= end_date:
-                        return df
-                    new_start = (df.index.max() + timedelta(days=1)).strftime('%Y-%m-%d')
-                    if new_start <= end_date:
-                        new_df = self._fetch_api(code, new_start, end_date, adj)
-                        if new_df is not None and len(new_df) > 0:
-                            df = pd.concat([df, new_df])
-                            df = df[~df.index.duplicated(keep='last')]
-                            df.to_csv(cache_path)
-                        return df
-            except Exception:
-                pass
-        df = self._fetch_api(code, start_date, end_date, adj)
-        if df is not None and len(df) > 0:
-            df.to_csv(cache_path)
-        return df
+        """Fetch data from API"""
+        return self._fetch_api(code, start_date, end_date, adj)
 
     def _fetch_api(self, code: str, start_date: str, end_date: str, adj: str) -> Optional[pd.DataFrame]:
         """Fetch from Flask API, also extracts premium_series for ETFs"""
@@ -122,7 +100,7 @@ class DataCache:
         params = {'code': code, 'start': start_date, 'end': end_date, 'adj': adj}
         for attempt in range(3):
             try:
-                resp = requests.get(url, params=params, timeout=self.timeout)
+                resp = _http_get(url, params=params, timeout=self.timeout)
                 if resp.status_code != 200:
                     if attempt < 2:
                         time.sleep(1)
@@ -142,75 +120,49 @@ class DataCache:
                     df = df.set_index('date').sort_index()
                 keep = [c for c in ['open', 'high', 'low', 'close', 'volume'] if c in df.columns]
                 df = df[keep]
-                # Extract and cache premium_series (ETF only)
+                # Extract premium_series (ETF only) and store in memory
                 premium_series = data.get('premium_series', [])
                 if premium_series:
                     df.attrs['premium_series'] = {item['date']: item['premium'] for item in premium_series}
-                    self._save_premium_cache(code, df.attrs['premium_series'])
+                    if code not in self.premium_data:
+                        self.premium_data[code] = {}
+                    self.premium_data[code].update(df.attrs['premium_series'])
                 print(f"  + {code}: {len(df)} rows ({adj})")
                 return df
-            except requests.exceptions.Timeout:
+            except (requests.exceptions.Timeout, requests.exceptions.SSLError, requests.exceptions.ConnectionError) as e:
+                # 网络相关错误（超时、SSL、连接断开）都进行重试
                 if attempt < 2:
+                    time.sleep(1 + attempt)  # 递增延迟: 1s, 2s
                     continue
-                print(f"  x {code}: timeout")
+                print(f"  x {code}: {type(e).__name__} after {attempt+1} retries")
                 return None
             except Exception as e:
                 print(f"  x {code}: {e}")
                 return None
         return None
 
-    def _save_premium_cache(self, code: str, premium_dict: Dict[str, float]):
-        """Save premium data to CSV cache"""
-        try:
-            cache_path = self._premium_cache_path(code)
-            pd.DataFrame(
-                [{'date': k, 'premium': v} for k, v in premium_dict.items()]
-            ).to_csv(cache_path, index=False)
-        except Exception:
-            pass
-
     def preload_premium(self, code: str, end_date: str = None) -> Optional[Dict[str, float]]:
-        """Load premium data for an ETF code from cache, with incremental update.
-        If cache exists but doesn't cover end_date, fetches the gap."""
+        """Load premium data for an ETF code, fetch from API if not in memory."""
         if code in self.premium_data:
-            # Already in memory - check if up-to-date
             if end_date:
                 dates = sorted(self.premium_data[code].keys())
                 if dates and dates[-1] >= end_date:
                     return self.premium_data[code]
             else:
                 return self.premium_data[code]
-        cache_path = self._premium_cache_path(code)
-        if cache_path.exists():
-            try:
-                df = pd.read_csv(cache_path)
-                if len(df) > 0 and 'date' in df.columns and 'premium' in df.columns:
-                    self.premium_data[code] = dict(zip(df['date'].astype(str), df['premium']))
-                    # Check if cache covers end_date
-                    if end_date:
-                        latest_cached = max(self.premium_data[code].keys())
-                        if latest_cached >= end_date:
-                            return self.premium_data[code]
-                        # Cache is stale - fetch gap from latest_cached+1 to end_date
-                        fetch_start = (pd.Timestamp(latest_cached) + timedelta(days=1)).strftime('%Y-%m-%d')
-                        self._fetch_premium_api(code, fetch_start, end_date)
-                    return self.premium_data[code]
-            except Exception:
-                pass
-        # No cache: fetch full history from API
         self._fetch_premium_api(code, '2000-01-01', end_date or datetime.now().strftime('%Y-%m-%d'))
         return self.premium_data.get(code)
 
     def _fetch_premium_api(self, code: str, start_date: str, end_date: str):
-        """Fetch premium_series from API and merge into cache"""
+        """Fetch premium_series from API and store in memory"""
         url = f"{self.base_url}{self.api_path}"
         params = {'code': code, 'start': start_date, 'end': end_date, 'adj': 'raw'}
         for attempt in range(3):
             try:
-                resp = requests.get(url, params=params, timeout=self.timeout)
+                resp = _http_get(url, params=params, timeout=self.timeout)
                 if resp.status_code != 200:
                     if attempt < 2:
-                        time.sleep(1)
+                        time.sleep(1 + attempt)
                         continue
                     return
                 data = resp.json()
@@ -222,11 +174,11 @@ class DataCache:
                     if code not in self.premium_data:
                         self.premium_data[code] = {}
                     self.premium_data[code].update(new_data)
-                    self._save_premium_cache(code, self.premium_data[code])
                     print(f"  + premium {code}: +{len(new_data)} days (total {len(self.premium_data[code])})")
                 return
-            except requests.exceptions.Timeout:
+            except (requests.exceptions.Timeout, requests.exceptions.SSLError, requests.exceptions.ConnectionError):
                 if attempt < 2:
+                    time.sleep(1 + attempt)
                     continue
                 return
             except Exception:
@@ -238,9 +190,10 @@ class DataCache:
         params = {'market': market, 'start': start_date, 'end': end_date}
         for attempt in range(3):
             try:
-                resp = requests.get(url, params=params, timeout=self.timeout)
+                resp = _http_get(url, params=params, timeout=self.timeout)
                 if resp.status_code != 200:
                     if attempt < 2:
+                        time.sleep(1 + attempt)
                         continue
                     return None
                 data = resp.json()
@@ -253,8 +206,15 @@ class DataCache:
                 result = pd.DatetimeIndex(dates)
                 print(f"  + {market}: {len(result)} trading days ({start_date} ~ {end_date})")
                 return result
+            except (requests.exceptions.Timeout, requests.exceptions.SSLError, requests.exceptions.ConnectionError) as e:
+                if attempt < 2:
+                    time.sleep(1 + attempt)
+                    continue
+                print(f"  x calendar: {type(e).__name__} after {attempt+1} retries")
+                return None
             except Exception as e:
                 if attempt < 2:
+                    time.sleep(1 + attempt)
                     continue
                 print(f"  x calendar: {e}")
                 return None
@@ -450,14 +410,17 @@ class SimpleRotationStrategy:
         today_date = recent.index[-1]
         if (date - today_date).days > 5:
             return None
-        close = float(today_row['close'])
-        prev_close = float(prev_row['close'])
-        # Handle missing open (common for index data like 931862.CSI)
-        open_price = float(today_row.get('open', close)) if 'open' in today_row.index else close
+        close_raw = today_row.get('close')
+        prev_close_raw = prev_row.get('close')
+        if close_raw is None or pd.isna(close_raw) or prev_close_raw is None or pd.isna(prev_close_raw):
+            return None
+        close = float(close_raw)
+        prev_close = float(prev_close_raw)
+        # Handle missing/invalid open (common for index data like 931862.CSI)
+        raw_open = today_row.get('open')
+        open_price = float(raw_open) if raw_open is not None and not pd.isna(raw_open) else close
         if pd.isna(open_price) or open_price == 0:
             open_price = close
-        if pd.isna(close) or pd.isna(prev_close):
-            return None
         return {
             'open': open_price,
             'close': close,
@@ -971,7 +934,7 @@ class SimpleRotationStrategy:
         if self.benchmark_data is not None:
             bm_close = self.benchmark_data['close'].reindex(df.index, method='ffill')
             if bm_close is not None and not bm_close.isna().all():
-                benchmark_nav = (1 + bm_close.pct_change()).cumprod()
+                benchmark_nav = (1 + bm_close.pct_change(fill_method=None)).cumprod()
                 first_valid = benchmark_nav.dropna().iloc[0] if len(benchmark_nav.dropna()) > 0 else 1
                 benchmark_nav = benchmark_nav / first_valid
 
@@ -981,7 +944,7 @@ class SimpleRotationStrategy:
             if code in self.index_data:
                 price = self.index_data[code]['close'].reindex(df.index, method='ffill')
                 if price is not None and not price.isna().all():
-                    nav_s = (1 + price.pct_change()).cumprod()
+                    nav_s = (1 + price.pct_change(fill_method=None)).cumprod()
                     fv = nav_s.dropna().iloc[0] if len(nav_s.dropna()) > 0 else 1
                     asset_navs[code] = nav_s / fv
 
@@ -999,7 +962,7 @@ class SimpleRotationStrategy:
         # Benchmark metrics
         b_total_return = b_annual = b_sharpe = b_dd = 0
         if benchmark_nav is not None:
-            bm_ret = benchmark_nav.pct_change()
+            bm_ret = benchmark_nav.pct_change(fill_method=None)
             b_total_return = benchmark_nav.iloc[-1] - 1
             b_annual = (1 + b_total_return) ** (252 / n_days) - 1 if n_days > 0 else 0
             b_sharpe = bm_ret.mean() / bm_ret.std() * np.sqrt(252) if bm_ret.std() > 0 else 0