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Marshmallow validates and deserialises - BUT, when it deserialises,
it explicitly sets `sms_sender=None`, even when you haven't passed
sms_sender in. This is problematic, because we wanted to take advantage
of sqlalchemy's default value to set sms_sender to `GOVUK` when the
actual DB commit happens.
Instead, still use marshmallow for validating, but manually carry out
the json deserialisation in the model class.
This fixes a bug that only manifested when the database was upgraded,
but the code hadn't updated. 🎉