text: from django.apps import AppConfig
  
  
  class InvoicingConfig(AppConfig):
      name = "apps.invoicing"
  
      def ready(self):
          from apps.annotations.registry import annotations
          from apps.search.registry import search
          from apps.audit.registry import audit
          from apps.invoicing.models import (
              Contractor,
              SaleInvoice,
              RefrigerantWeights,
              ServiceTemplate,
              SaleInvoiceItem,
              CorrectiveSaleInvoice,
          )
  
          annotations.register(Contractor)
          annotations.register(SaleInvoice)
          search.register(Contractor)
          search.register(SaleInvoice)
          audit.register(Contractor)
          audit.register(SaleInvoice)
          audit.register(RefrigerantWeights)
          audit.register(ServiceTemplate)
          audit.register(SaleInvoiceItem)
          audit.register(CorrectiveSaleInvoice)
  