Как решить ошибку при селекте объектов с one to one relationship?

Question

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Привет, столкнулся с странной ошибкой.
Модели:

class Accounts(Base):
    __tablename__ = 'accounts'

    id = Column(Integer, autoincrement=True, primary_key=True)
    name = Column(String, unique=True)
    number = Column(String(30), unique=True)


class Groups(Base):
    __tablename__ = 'groups'

    id = Column(Integer, autoincrement=True, primary_key=True)
    join_name = Column(String)
    spam_time_interval = Column(Integer)  # minutes
    message_text = Column(String)


class WorkerTask(Base):
    __tablename__ = 'workers'

    id = Column(Integer, autoincrement=True, primary_key=True)

    group_id = Column(Integer, ForeignKey('groups.id'))
    group = relationship("Groups", backref=backref("groups", uselist=False))

    account_id = Column(Integer, ForeignKey('accounts.id'))
    account = relationship("Accounts", backref=backref("account", uselist=False))

Селект:

async def get_group_workers_db(group_id):
    stmt = select(WorkerTask.id, WorkerTask.account.number).where(WorkerTask.group_id == group_id)
    return engine.connect().execute(stmt).fetchall()

Ошибка:

Traceback (most recent call last):
  File "D:\Да это же мой код\Aiogram\GroupMultiSpamer\venv\lib\site-packages\sqlalchemy\orm\attributes.py", line 327, in __getattr__
    return getattr(self.comparator, key)
AttributeError: 'Comparator' object has no attribute 'number'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "D:\Да это же мой код\Aiogram\GroupMultiSpamer\tes.py", line 6, in <module>
    asyncio.run(get_group_workers_db(1))
  File "C:\Program Files\Python310\lib\asyncio\runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "C:\Program Files\Python310\lib\asyncio\base_events.py", line 646, in run_until_complete
    return future.result()
  File "D:\Да это же мой код\Aiogram\GroupMultiSpamer\database\responses.py", line 92, in get_group_workers_db
    stmt = select(WorkerTask.id, WorkerTask.account.number).where(WorkerTask.group_id == group_id)
  File "D:\Да это же мой код\Aiogram\GroupMultiSpamer\venv\lib\site-packages\sqlalchemy\orm\attributes.py", line 329, in __getattr__
    util.raise_(
  File "D:\Да это же мой код\Aiogram\GroupMultiSpamer\venv\lib\site-packages\sqlalchemy\util\compat.py", line 210, in raise_
    raise exception
AttributeError: Neither 'InstrumentedAttribute' object nor 'Comparator' object associated with WorkerTask.account has an attribute 'number'

В чём может быть причина?