Delete duplicate entry - Django

remove_duplicate.py

from django.db import models

unique_fields = ['company_id', 'applicant_id']
duplicates = (CertificationApplicantCompany.objects.values(*unique_fields)
                             .order_by()
                             .annotate(max_id=models.Max('id'),
                                       count_id=models.Count('id'))
                             .filter(count_id__gt=1))

for duplicate in duplicates:
    (CertificationApplicantCompany.objects.filter(**{x: duplicate[x] for x in unique_fields})
                    .exclude(id=duplicate['max_id'])
                    .delete())

for duplicate in duplicates:
    arguments = {}
    for x in unique_fields:
        arguments[x] = duplicate[x]
    CertificationApplicantCompany.objects.filter(**arguments).exclude(id=duplicate['max_id']).delete()