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Fixed #22445 -- Added how to perform a reverse data migration to topic guide.
Thanks Karen Tracey for the report.
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@ -389,6 +389,11 @@ need to do is use the historical model and iterate over the rows::
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Once that's done, we can just run ``python manage.py migrate`` as normal and
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the data migration will run in place alongside other migrations.
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You can pass a second callable to
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:class:`~django.db.migrations.operations.RunPython` to run whatever logic you
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want executed when migrating backwards. If this callable is omitted, migrating
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backwards will raise an exception.
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If you're interested in the more advanced migration operations, or want
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to be able to write your own, see the :doc:`migration operations reference
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</ref/migration-operations>`.
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