Selectively delete south migration history in Django

remove_south_migration_history.md

To reset migrations of just a single app, say polls

from south.models import MigrationHistory
MigrationHistory.objects.filter(app_name='polls').delete()

Make sure you delete the migrations folder (at APPNAME/migrations)

./manage.py schemamigration --initial polls
./manage.py migrate --fake

Done.