feat: deal status history and default created_at in db

repositories/board.py

@@ -29,9 +29,7 @@ class BoardRepository(BaseRepository):
         return result.scalar_one_or_none()
 
     async def create(self, data: CreateBoardSchema) -> Board:
-        board_data = data.model_dump()
-        board_data["created_at"] = datetime.now(timezone.utc)
-        board = Board(**board_data)
+        board = Board(**data.model_dump())
         self.session.add(board)
         await self.session.commit()
         await self.session.refresh(board)