https://swapi.co/api/people/ is down but I found an alternative https://swapi.dev/api/

In case it's not 100% compatible some changes need to be made to the etl code (data_operations.py file) and possibly to API client.

It wasn't clear from the requirements whether the Value Count is about the full dataset or just the displayed items (with possible use of Load more). I decided to use it on the full dataset.

Wick docker-compose

docker-compose build
docker-compose run app python manage.py migrate
docker-compose up

or on host machine - requires database and configuration changes

pip install poetry
poetry install
python manage.py migrate
python manage.py runserver

• tests!!!
• configuration is hardcoded in settings.py - it should be injected from external source
• there is no styling on frontend - it could use some minimal Bootstrap
• breadcrumbs for easier navigation would be nice
• handling selected headers for Value Count is currently tricky and should be improved

• fetching all of planets could be replaced by fetching only the ones we need (especially if set of planets is way larger than characters)
• hash join could be faster/more memory efficient than normal one
• petl.appendcsv can be used to deal with saving large dataset
• some other method could be used to read limited number of lines from csv