Django DeleteView не сохраняет изменения

Я использую django DeleteView для удаления учетной записи пользователя. когда я устанавливаю свойство is_active пользователя в False, оно не сохраняется в базе данных. оно по-прежнему установлено в True

вот мой views.py

from django.shortcuts import get_object_or_404
from django.urls import reverse_lazy
from django.http import HttpResponseRedirect
from django.views.generic.edit import DeleteView
from django.contrib.auth.mixins import LoginRequiredMixin
from django.contrib.messages.views import SuccessMessageMixin


class DeleteAccount(LoginRequiredMixin, SuccessMessageMixin, DeleteView):
    """
    DeleteAccount: view to delete user account
    """

    model = User
    template_name = 'registration/delete_account.html'
    success_url = reverse_lazy('core:index')
    success_message = 'Account Successfully Deleted!'

    def form_valid(self, form):
        """
        Delete account and logout current user
        """

        account = self.get_object()

        # verify if user is the rightful owner of this account
        if not account.id == self.request.user.id:
            return HttpResponseRedirect(reverse_lazy('accounts:index'))

        account.is_active = False # DOESN'T GET SAVED
        account.save() # EVEN AFTER CALLING MODEL.SAVE() METHOD

        logout(self.request)

        return super().form_valid(form)

    def get_object(self):
        return get_object_or_404(User, pk = self.request.user.id)
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