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Create a custom admin class like so:
class DeleteNotAllowedModelAdmin(admin.ModelAdmin):
# Other stuff here
def has_delete_permission(self, request, obj=None):
return False
If you only want to prevent deletion of say the last site and allow when there are more than one defined in the database:
class DeleteNotAllowedModelAdmin(admin.ModelAdmin):
# Other stuff here
def has_delete_permission(self, request, obj=None):
if Site.objects.count() > 1:
return True
return False
Or something like this.
Edit: and as for how to register that custom class, look here
Source:stackexchange.com