go-backend | clean Architecture facepunch , Testable facepunch | REST library

I'm deploying my Django-backend, React-frontend app to Heroku and when running git push heroku master I'm running into a weird error:

Could not find a required file.
Name: index.html
Searched in: /tmp/build_7abd977a/public

Apparently when running npm run build it creates a build folder with the following structure:

Looks like for some reason the public folder isn't created upon running the scripts, can someone advice how can I perhaps create it with the script or run my index.html from a different location (Or at least tell me the location of the file its being imported in)?

Here is the full traceback:

We are using Django as backend for a website that provides various things, among others using a Neural Network using Tensorflow to answer to certain requests.

For that, we created an AppConfig and added loading of this app config to the INSTALLED_APPS in Django's settings.py. This AppConfig then loads the Neural Network as soon as it is initialized:

settings.py:

I would like to run tests of an library against different backend implementations.
The implementations are injected in my project by the magic of Spring.

Currently I do this, by changing the line

I have completed the following tutorial https://dev.to/amartyadev/flutter-app-authentication-with-django-backend-1-21cp which although useful, has left me still pretty clueless how to move forward. I am able to login and the user details are saved via a UserRepository class to a sqlite database locally, including the authentication token, but I have no idea how to access this when trying to make repeat requests to the server for data. there are no problems with the existing code but I will present several pages so you can see what I have done and am trying to achieve and how it is put together.

main.dart:

I have the below 2 models - User and PhoneProfile.

I can successfully create records for User. When i browse to PhoneProfile using admin console, i can see the foreign key present. On selection of an entry and completion of the rest of the fields, i get the error below.

I'm sending post-request from front using axios