text: """passbook administration overview"""
  from django.core.cache import cache
  from django.shortcuts import redirect, reverse
  from django.views.generic import TemplateView
  
  from passbook import __version__
  from passbook.admin.mixins import AdminRequiredMixin
  from passbook.core.models import (
      Application,
      Factor,
      Invitation,
      Policy,
      Provider,
      Source,
      User,
  )
  from passbook.root.celery import CELERY_APP
  
  
  class AdministrationOverviewView(AdminRequiredMixin, TemplateView):
      """Overview View"""
  
      template_name = "administration/overview.html"
  
      def post(self, *args, **kwargs):
          """Handle post (clear cache from modal)"""
          if "clear" in self.request.POST:
              cache.clear()
              return redirect(reverse("passbook_core:auth-login"))
          return self.get(*args, **kwargs)
  
      def get_context_data(self, **kwargs):
          kwargs["application_count"] = len(Application.objects.all())
          kwargs["policy_count"] = len(Policy.objects.all())
          kwargs["user_count"] = len(User.objects.all())
          kwargs["provider_count"] = len(Provider.objects.all())
          kwargs["source_count"] = len(Source.objects.all())
          kwargs["factor_count"] = len(Factor.objects.all())
          kwargs["invitation_count"] = len(Invitation.objects.all())
          kwargs["version"] = __version__
          kwargs["worker_count"] = len(CELERY_APP.control.ping(timeout=0.5))
          kwargs["providers_without_application"] = Provider.objects.filter(
              application=None
          )
          kwargs["policies_without_binding"] = len(
              Policy.objects.filter(policymodel__isnull=True)
          )
          kwargs["cached_policies"] = len(cache.keys("policy_*"))
          return super().get_context_data(**kwargs)
  