[Answer]-Containing information related to two models in Django

A many-to-many relationship with a through table is the right approach here.

https://docs.djangoproject.com/en/dev/topics/db/models/#extra-fields-on-many-to-many-relationships

Behind the scenes, Django will create an intermediary table for a many-to-many field anyway, so worrying about extra overhead on lookups is unnecessary. There’s no way around it.