참고자료 https://stackoverflow.com/questions/10840030/django-post-save-preventing-recursion-without-overriding-model-save
참고자료 https://stackoverflow.com/questions/68652926/django-serializer-update-method-key-error-in-validated-data
참고자료 https://stackoverflow.com/questions/30616211/how-to-limit-the-queryset-of-an-inline-model-in-django-admin
참고자료 https://stackoverflow.com/questions/43915518/how-to-use-custom-password-validators-beside-the-django-auth-password-validators
참고자료 https://stackoverflow.com/questions/52073874/django-rest-framework-return-403-in-serializer
참고자료 https://stackoverflow.com/questions/51356728/drf-nested-routers-create-update-nested-object-on-post-put-patch
참고자료 https://stackoverflow.com/questions/59302723/attributeerror-response-object-has-no-attribute-label-drf-yasg
참고자료 http://www.fun25.co.kr/blog/python-django-orm-distinct
참고자료 https://docs.djangoproject.com/en/4.0/topics/db/aggregation/
참고자료https://stackabuse.com/format-number-as-currency-string-in-python/
https://stackoverflow.com/questions/4255400/exclude-empty-null-values-from-json-serialization
참고자료 https://stackoverflow.com/questions/27015931/remove-null-fields-from-django-rest-framework-response
참고자료 https://stackoverflow.com/questions/22958058/how-to-change-field-name-in-django-rest-framework
참고자료 https://stackoverflow.com/questions/912540/django-object-multiple-exclude
참고자료 https://stackoverflow.com/questions/25203259/django-filter-multiple-url-parameters
참고자료 https://www.delftstack.com/ko/howto/python/string-to-boolean-python/
참고자료 https://docs.aws.amazon.com/ko_kr/ground-station/latest/ug/create-ec2-ssh-key-pair.html