FULL JOIN in SQLAlchemy?

I would like to display a list of “last entries” in a budget app. The entries (like expenses, income, account transfers, loans) have different columns defined apart from a user_id.

In SQL I would go for a FULL JOIN, but I am using SQLAlchemy (declarative). What is the correct approach here? Some meta table?

Thanks a lot.

Example tables:

class Expense(Base):
    __tablename__ = 'expenses'
    id = Column(Integer, primary_key=True)
    user = Column('user_id', Integer, ForeignKey('users.id'))
    date = Column(Integer)
    category = Column('category_id', Integer, ForeignKey('expense_categories.id'))
    description = Column(String(50))
    deduct_from = Column('account_id', Integer, ForeignKey('accounts.id'))
    amount = Column(Float(precision=2))

class Loan(Base):
    __tablename__ = 'loans'
    id = Column(Integer, primary_key=True)
    from_user = Column('from_user_id', Integer, ForeignKey('users.id'))
    to_user = Column('to_user_id', Integer, ForeignKey('users.id'))
    date = Column(Integer)
    account = Column('account_id', Integer, ForeignKey('accounts.id'))
    description = Column(String(50))
    amount = Column(Float(precision=2)