Note1: it uses populate_db.py, also use in other branch, still don't know its final place (in main, in api or elsewhere).
Note2: I alter populate_db.py regarding PEP8/pylint (and I remove code unused)
Note3: pylint score is still very bad, I have pb with indentation expected, it doesn't enhanced lisibility IMO.
Note4: I also have pb with space around '=', I'd like very much to align those '=' to ease lisibility.

Last note: I had 2 errors due to 'from main.models' which I do not understand.