delete migrations django and start over deployment heroku
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#If you still have the old code running on Heroku:
#1) Back your database up
#2) Reverse all of your migrations:
$ heroku run python manage.py migrate appname zero
#3) Then deploy your new code:
$ git push heroku master
#4) Then run the new migrations:
$ heroku run python manage.py migrate
#If you've already deployed the new code to Heroku:
#1) Back your database up
#2) Manually delete your app's tables from your database, as well as rows from the django_migrations table where the app matches your app name e.g. via heroku pg:psql (this may get tricky if you have other apps installed and inter-app dependencies)
#3) Run your new migrations:
$ heroku run python migrate