How to properly work/delete with a model that is related to many other models?

Question

Django

Let's say there are about 20 - 30 models in the project, and all of them are connected via Fk or ManyToMany with the File model .
file model:

class File(models.Model):
    file = models.FileField(upload_to=upload_name)

After the expiration of time, the File model accumulated a lot of records in the database that are not associated with more than one model.
It would seem that the answer is simple, run cron every night and delete entries from the database that do not have bundles. Well, what if I have several such models of the File type File , Tag, Notes, ... ? How correct is my method, won't it load the server too much, all the same cycles, requests to the database? please share advice/best practice in this matter.

Answer 1

model has on_delete=models.CASCADE