jjoshm/azubiheft-api ? reverse-engineered prompt

Build me a small Python library that works as a wrapper for azubiheft.de so I can manage Ausbildung reports from scripts instead of doing everything in the browser.

I want a simple session based API where I can log in with a username and password, check whether I am logged in, fetch the available subjects, add a subject, delete a subject by id, get a report for a specific date, get the report week id for a date, write a new report entry, and delete a report entry. It should feel easy to use from a normal Python file, with clear method names and sensible return values.

Please include a few basic tests and make the README show quick examples for login, reading a report, updating it, and logging out. Keep it clean and practical, and if you need current details from the site or best practices for the API, look them up online first.