How to update my production database in a django/heroku project with a script
i suggest you update the data in your local then make a fixture, commit and push it in your heroku. then do load the data using the terminal

update data (locally)
make a fixture (manage.py dumpdata)
commit and push to heroku
login via terminal (heroku login)
load the data (heroku run python manage.py loaddata .json)
I want to update a field in my users table on my django project hosted on heroku. 
Is there a way I can run a script(if so from where?) using what? 
That allows me to update a field in the database? I could do this manually in the django admin but it would take way to long as there are large number of users. 
Any advice is appreciated.