Add debug logging for trade_date

apps/api/routers/trade_hf.py

@@ -73,6 +73,11 @@ async def search_trade_records(
         result = await db.execute(paginated_query)
         records = result.scalars().all()
         
+        # 调试：打印第一条记录的trade_date
+        if records:
+            first = records[0]
+            print(f"DEBUG: First record trade_date type={type(first.trade_date)}, value={repr(first.trade_date)}")
+        
         # 转换为响应格式
         items = []
         for r in records: