You will want to create a virtualenv using python 3.10 or higher (3.11 was used), likely via:
python3 -m venv venv
source venv/bin/activate
python -m pip install -r requirements.txt
API_TESTING=1 python -m tests to run the unit tests
uvicorn app:app --host 0.0.0.0 --port 8000 to run the server
At this time there are no background tasks to attain historical altitude data and thus in order to get the data, the server must be queried via the /stats API at the respective rate.