Django Signal DataBase Change on Template

I'm building a GPS Tracking System using Django, i should have a grid on my template that display real time information of cars (position,vitesse, temperature...). GPS send data to Postgres DataBase via a module that parse Data and saved it in specific table. What i need is how to make my Web

Multiple Primary Key composed by a Foreign key

Hi, I would like to implement multicolumns primary keys in django, i need to implement a UserPro model that allow that i have a multiple users who have the same username but belong to different Entreprise this is my code #models.py from django.db import models from django.db.models.signals