code: def delete_mutation_inputs(service):
      
      from nautilus.api.util import summarize_mutation_io
  
      # the only input for delete events is the pk of the service record
      return [summarize_mutation_io(name='pk', type='ID', required=True)]
docs: Args:
              service : The service being deleted by the mutation
          Returns:
              ([str]):  the only input for delete is the pk of the service.