Django model instances primary keys do not reset to 1 after all instances are deleted

Question

I have been working on an offline version of my Django web app and have frequently deleted model instances for a certain ModelX.

I have done this from the admin page

Answer 1

I'm not sure when this was added, but the following management command will delete all data from all tables and will reset the auto increment counters to 1.

./manage.py sqlflush | psql DATABASE_NAME