[Fixed]-Archiving data in Django like a magic?

I would solve this problem with Abstract Model Inheritance.

This will allow you to write logic for one class and set of fields and it will apply to all child classes.

class IsActive(models.Model):
    class Meta:
        abstract = True
    is_active = models.BooleanField(default=False)

    def toggle_active(self):
        self.is_active = !self.is_active

class Child(IsActive):
    # This object now has `is_active` and `toggle_active` fields.