I'm pretty sure you need to move the read_date under attachments (locally it fixes the issue below)
ValueError: No mandatory attributes allowed after an attribute with a default value or factory. Attribute in question: Attribute(name='status', default=NOTHING, validator=<instance_of validator for type <class 'int'>>, repr=True, eq=True, eq_key=None, order=True, order_key=None, hash=None, init=True, metadata=mappingproxy({'key': 'Status'}), type=<class 'int'>, converter=<function int_if_not_none at 0x0000022171003A30>, kw_only=False, inherited=False, on_setattr=None)