Refactor and translate comments and docstrings in utility modules to English for better clarity and maintainability. Update Gunicorn and application startup messages for consistency in language. Enhance documentation with English translations for better accessibility.

backend_api_python/app/routes/backtest.py

@@ -88,15 +88,15 @@ def _normalize_lang(lang: str | None) -> str:
 @backtest_bp.route('/backtest/precision-info', methods=['GET'])
 def get_precision_info():
     """
-    获取回测精度信息（用于前端提示）
+    Get backtest accuracy information (for front-end prompts)
     
     Params (Query String):
-        market: 市场类型
-        startDate: 开始日期 (YYYY-MM-DD)
-        endDate: 结束日期 (YYYY-MM-DD)
+        market: market type
+        startDate: start date (YYYY-MM-DD)
+        endDate: end date (YYYY-MM-DD)
         
     Returns:
-        精度信息，包含推荐的执行时间框架和预估K线数量
+        Accuracy information, including recommended execution time frame and estimated number of K-lines
     """
     try:
         # Use request.args for GET params
@@ -164,7 +164,7 @@ def run_backtest():
         leverage = int(data.get('leverage', 1))
         trade_direction = data.get('tradeDirection', 'long')  # long, short, both
         strategy_config = data.get('strategyConfig') or {}
-        # 多时间框架回测开关（默认开启，仅加密货币市场有效）
+        # Multi-timeframe backtesting switch (enabled by default, only valid for cryptocurrency markets)
         enable_mtf = data.get('enableMtf', True)
         if isinstance(enable_mtf, str):
             enable_mtf = enable_mtf.lower() in ['true', '1', 'yes']
@@ -185,7 +185,7 @@ def run_backtest():
             except Exception:
                 pass
 
-        # 参数验证
+        # Parameter validation
         if not all([indicator_code, symbol, market, timeframe, start_date_str, end_date_str]):
             return jsonify({
                 'code': 0,
@@ -193,27 +193,27 @@ def run_backtest():
                 'data': None
             }), 400
         
-        # 转换日期
-        # 开始日期：当天的 00:00:00
+        # conversion date
+        # Start date: 00:00:00 today
         start_date = datetime.strptime(start_date_str, '%Y-%m-%d')
-        # 结束日期：当天的 23:59:59，确保包含整天的数据
+        # End date: 23:59:59 of the current day, ensuring that the entire day's data is included
         end_date = datetime.strptime(end_date_str, '%Y-%m-%d').replace(hour=23, minute=59, second=59)
         
-        # 验证时间范围限制
+        # Validation time range limit
         days_diff = (end_date - start_date).days
         
-        # 根据周期设置不同的时间限制
+        # Set different time limits based on cycles
         if timeframe == '1m':
-            max_days = 30  # 1分钟K线最多1个月
+            max_days = 30  # 1 minute K-line up to 1 month
             max_range_text = '1 month'
         elif timeframe == '5m':
-            max_days = 180  # 5分钟K线最多6个月
+            max_days = 180  # 5 minute K-line up to 6 months
             max_range_text = '6 months'
         elif timeframe in ['15m', '30m']:
-            max_days = 365  # 15分钟和30分钟K线最多1年
+            max_days = 365  # 15-minute and 30-minute K-line up to 1 year
             max_range_text = '1 year'
         else:  # 1H, 4H, 1D, 1W
-            max_days = 1095  # 1小时及以上最多3年
+            max_days = 1095  # 1 hour and above up to 3 years
             max_range_text = '3 years'
         
         if days_diff > max_days:
@@ -224,8 +224,8 @@ def run_backtest():
             }), 400
         
         
-        # 执行回测（支持多时间框架高精度回测）
-        # 加密货币市场且启用MTF时，使用多时间框架回测
+        # Execute backtesting (supports multi-time frame high-precision backtesting)
+        # Cryptocurrency markets and using multi-timeframe backtesting when MTF is enabled
         if enable_mtf and market.lower() in ['crypto', 'cryptocurrency']:
             result = backtest_service.run_multi_timeframe(
                 indicator_code=indicator_code,
@@ -257,7 +257,7 @@ def run_backtest():
                 trade_direction=trade_direction,
                 strategy_config=strategy_config
             )
-            # 添加标准回测的精度信息
+            # Add accuracy information for standard backtests
             result['precision_info'] = {
                 'enabled': False,
                 'timeframe': timeframe,