Only create GradingRecords for succeful projects or failed projects with Surveys. This is done because it has no use to create new GradingRecords for already failed/invalid projects because the outcome of this one will have no changing effect on the status.

from django.contrib import admin
from django.contrib.sites.models import Site


class SiteAdmin(admin.ModelAdmin):
    list_display = ('domain', 'name')
    search_fields = ('domain', 'name')

admin.site.register(Site, SiteAdmin)