Change trade_date to String type to avoid SQLAlchemy datetime conversion errors

apps/api/routers/trade_hf.py

@@ -81,10 +81,15 @@ async def search_trade_records(
         # 转换为响应格式
         items = []
         for r in records:
-            # 处理空日期：构造字典而不是使用from_attributes
-            trade_date = r.trade_date
-            if not trade_date or (isinstance(trade_date, str) and trade_date.strip() == ''):
+            # 处理日期字符串：SQLAlchemy现在返回字符串
+            trade_date_str = r.trade_date
+            if not trade_date_str or trade_date_str.strip() == '':
                 trade_date = datetime(2020, 1, 1)
+            else:
+                try:
+                    trade_date = datetime.fromisoformat(trade_date_str.replace(' ', 'T'))
+                except:
+                    trade_date = datetime(2020, 1, 1)
             
             items.append(TradeRecordResponse(
                 record_id=r.record_id,

packages/core/models.py

@@ -33,7 +33,7 @@ class StandardTradeRecord(Base):
     
     source_country = Column(String(10), index=True, nullable=False, comment="数据来源国")
     trade_direction = Column(String(10), index=True, nullable=False, comment="贸易方向: import / export")
-    trade_date = Column(DateTime, index=True, nullable=False, comment="交易发生日期")
+    trade_date = Column(String(50), index=True, nullable=True, comment="交易发生日期")
     
     importer_name = Column(String(255), index=True, nullable=True, comment="进口商名称(清洗后)")
     exporter_name = Column(String(255), index=True, nullable=True, comment="出口商名称(清洗后)")