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We need to update letter notifications with a new status when DVLA gives us a list of references for returned letters. This adds the new status to the models and the DB. DVLA call this 'returned mail', so I'm using it as the status name since it seems less ambiguous than 'returned'.
Generic single-database configuration.
flask db migrate to generate migration script.
flask db upgrade to upgrade db with script.
flask db downgrade to rollback db changes.
flask db current to show current script.