account/models.py
class Account(Base):
    __tablename__ = 'accounts'

    # There is also constraint, that checks 1 <= rating <= 5
    id = sa.Column(sa.Integer, primary_key=True, index=True)
    username = sa.Column(sa.String, unique=True, nullable=False)

    photo = sa.Column(sa.String, unique=True, nullable=True)
    user_id = sa.Column(sa.Integer, sa.ForeignKey('users.id'))
    events: Mapped[List["Event"]] = relationship(
        back_populates='accounts',
        secondary=AccountEventAssociation,
    )
    user = relationship('User', back_populates='account')
    event = relationship('Event', back_populates='owner')

auth.models.py
class User(Base):
    __tablename__ = 'users'

    id = sa.Column(sa.Integer, primary_key=True, index=True)
    email = sa.Column(sa.String, unique=True, index=True)
    first_name = sa.Column(sa.String, nullable=False)
    last_name = sa.Column(sa.String, nullable=False)
    hashed_password = sa.Column(sa.String)
    is_active = sa.Column(sa.Boolean, default=True)
    birthdate = sa.Column(sa.Date, nullable=False)
    created_at = sa.Column(sa.DateTime, default=datetime.now)
    updated_at = sa.Column(sa.DateTime, onupdate=datetime.now)
    account = relationship(
        'Account',
        uselist=False,
        back_populates='user',
    )
    is_email_verified = sa.Column(sa.Boolean, default=False)