20240806135123-django field value conversion

Django uses the *Field class get_prep_value and from_db_value to decide how to convert a python value into whatever the database needs and viceversa

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• https://docs.djangoproject.com/en/5.0/howto/custom-model-fields/[#converting](/a/tag/converting/)-python-objects-to-query-values
• charfield example https://github.com/django/django/blob/8deb6bb1fc427762d56646bf7306cbd11fb5bb68/django/db/models/fields/__init__.py[#L1291](/a/tag/L1291/)