====== Autour des migrations ======

  * Résumé : https://riptutorial.com/django/topic/1200/migrations
  * Manuelles :
    * https://riptutorial.com/django/example/3908/manual-migrations
    * https://riptutorial.com/django/example/24498/change-a-charfield-to-a-foreignkey
    * https://www.piglets.org/blog/2015/12/07/manually-completing-a-botched-django-migration/