feat:修复客服agent功能

repositories/fin_transaction.py

@@ -36,3 +36,13 @@ class FinTransactionRepo(BaseRepository):
                 FinTransaction.customer_id == customer_id
             )
         )
+
+    async def list_recent(self, customer_id: int, *, limit: int = 20) -> list[FinTransaction]:
+        """按客户读取最近成交记录，供投顾上下文摘要使用。"""
+        stmt = (
+            select(FinTransaction)
+            .where(FinTransaction.customer_id == customer_id)
+            .order_by(FinTransaction.create_time.desc(), FinTransaction.id.desc())
+            .limit(max(1, min(limit, 100)))
+        )
+        return list((await self.db.scalars(stmt)).all())