fix(HEL-494): 修复个股缺失指标、问天遮罩、四爻外显并回补250日K

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

backend/features/market/charts.py

@@ -23,6 +23,9 @@ class ChartDataError(RuntimeError):
     pass
 
 
+DAILY_CHART_LIMIT = 250
+
+
 TRENDS_URL = "https://push2delay.eastmoney.com/api/qt/stock/trends2/get"
 HIS_TRENDS_URL = "https://push2his.eastmoney.com/api/qt/stock/trends2/get"
 BOARD_LIST_URL = "https://push2delay.eastmoney.com/api/qt/clist/get"
@@ -64,7 +67,7 @@ class MarketChartClient:
         except (IfindError, ChartDataError):
             return self.fallback.stock_intraday(normalized)
 
-    def stock_daily(self, code: str, end_date: str, limit: int = 90) -> list[dict[str, Any]]:
+    def stock_daily(self, code: str, end_date: str, limit: int = DAILY_CHART_LIMIT) -> list[dict[str, Any]]:
         normalized = str(code or "").strip()
         if not re.fullmatch(r"\d{6}", normalized):
             raise ChartDataError("Invalid stock code")
@@ -73,7 +76,7 @@ class MarketChartClient:
             return hub_rows
         return self._ifind_daily(_stock_market_code(normalized), end_date, limit)
 
-    def index_daily(self, identifier: str, end_date: str, limit: int = 90) -> list[dict[str, Any]]:
+    def index_daily(self, identifier: str, end_date: str, limit: int = DAILY_CHART_LIMIT) -> list[dict[str, Any]]:
         normalized = str(identifier or "").strip().upper()
         if normalized not in INDEX_SECIDS:
             raise ChartDataError("Unsupported index")