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/strategy.py

@@ -600,7 +600,7 @@ def get_positions():
                 pct = _calc_pnl_percent(entry, size, pnl)
 
                 rr = dict(r)
-                # 确保 entry_price 有值（如果数据库中是 NULL，使用计算出的 entry 值）
+                # Make sure entry_price has a value (if it is NULL in the database, use the calculated entry value)
                 if not rr.get("entry_price") or float(rr.get("entry_price") or 0.0) <= 0:
                     rr["entry_price"] = float(entry or 0.0)
                 else:
@@ -818,10 +818,10 @@ def test_connection():
     try:
         data = request.get_json() or {}
         
-        # 记录请求数据（用于调试，但不记录敏感信息）
+        # Log request data (for debugging, but do not log sensitive information)
         logger.debug(f"Connection test request keys: {list(data.keys())}")
         
-        # 获取交易所配置
+        # Get exchange configuration
         exchange_config = data.get('exchange_config', data)
         
         # Local deployment: no encryption/decryption; accept dict or JSON string.
@@ -832,7 +832,7 @@ def test_connection():
             except Exception:
                 pass
         
-        # 验证 exchange_config 是否为字典
+        # Verify exchange_config is a dictionary
         if not isinstance(exchange_config, dict):
             logger.error(f"Invalid exchange_config type: {type(exchange_config)}, data: {str(exchange_config)[:200]}")
             # Frontend expects HTTP 200 with {code:0} for business failures.
@@ -844,21 +844,21 @@ def test_connection():
         user_id = g.user_id if hasattr(g, 'user_id') else 1
         resolved = resolve_exchange_config(exchange_config, user_id=user_id)
 
-        # 验证必要字段 (check resolved config after credential merge)
+        # Verify required fields (check resolved config after credential merge)
         if not resolved.get('exchange_id'):
             return jsonify({'code': 0, 'msg': 'Please select an exchange', 'data': None})
         
         api_key = resolved.get('api_key', '')
         secret_key = resolved.get('secret_key', '')
         
-        # 详细日志排查
+        # Detailed log troubleshooting
         logger.info(f"Testing connection: exchange_id={resolved.get('exchange_id')}")
         if api_key:
             logger.info(f"API Key: {api_key[:5]}... (len={len(api_key)})")
         if secret_key:
             logger.info(f"Secret Key: {secret_key[:5]}... (len={len(secret_key)})")
         
-        # 检查是否有特殊字符
+        # Check if there are special characters
         if api_key and api_key.strip() != api_key:
             logger.warning("API key contains leading/trailing whitespace")
         if secret_key and secret_key.strip() != secret_key:
@@ -1052,7 +1052,7 @@ def get_strategy_notifications():
             created_at = item.get('created_at')
             if created_at:
                 if hasattr(created_at, 'timestamp'):
-                    # 无时区 datetime：连接已 SET TIME ZONE UTC，按 UTC 解释再转 Unix，避免服务端本地 TZ 误判
+                    # No time zone datetime: The connection has SET TIME ZONE UTC, interpret it according to UTC and then transfer to Unix to avoid misjudgment of the local TZ on the server side.
                     if getattr(created_at, 'tzinfo', None) is None:
                         created_at = created_at.replace(tzinfo=_dt_tz.utc)
                     item['created_at'] = int(created_at.timestamp())