add config: get strategy history limit.（策略中的历史获取ticket数量可配置，当策略运行于分钟线的时候500条历史数据是不够的）

QuantDinger.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="PYTHON_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="jdk" jdkName="Python 3.12 (QuantDinger)" jdkType="Python SDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+  <component name="TemplatesService">
+    <option name="TEMPLATE_CONFIGURATION" value="Django" />
+  </component>
+</module>

backend_api_python/app/services/trading_executor.py

@@ -591,7 +591,8 @@ def _run_strategy_loop(self, strategy_id: int):
             # 初始化阶段：获取历史K线并计算指标
             # ============================================
             # logger.info(f"策略 {strategy_id} 初始化：获取历史K线数据...")
-            klines = self._fetch_latest_kline(symbol, timeframe, limit=500)
+            history_limit = int(os.getenv('K_LINE_HISTORY_GET_NUMBER', 500))
+            klines = self._fetch_latest_kline(symbol, timeframe, limit=history_limit)
             if not klines or len(klines) < 2:
                 logger.error(f"Strategy {strategy_id} failed to fetch K-lines")
                 return

backend_api_python/env.example

@@ -286,3 +286,5 @@ CREDITS_REGISTER_BONUS=100
 # Referral bonus credits (邀请用户赠送积分，邀请人获得)
 CREDITS_REFERRAL_BONUS=50
 
+# History K-Line ticket get number （策略中默认获取历史K线数量）
+K_LINE_HISTORY_GET_NUMBER=500