old_contents: from django.db.models import Q
  
  from rest_framework import filters
  import django_filters
  
  from core.models import InstanceStatusHistory
  
  from api.v2.serializers.details import InstanceStatusHistorySerializer
  from api.v2.views.base import AuthReadOnlyViewSet
  from api.v2.views.mixins import MultipleFieldLookup
  
  class InstanceStatusHistoryFilter(django_filters.FilterSet):
      instance = django_filters.MethodFilter(action='filter_instance_id')
      created_by = django_filters.CharFilter('instance__created_by__username')
  
      def filter_instance_id(self, queryset, value):
          try:
              int_val = int(value)
              return queryset.filter(
                      Q(instance__provider_alias=int_val)
                      | Q(instance_id=int_val))
          except ValueError:
              #Dealing with a UUID
              return queryset.filter(instance__provider_alias=value)
  
      class Meta:
          model = InstanceStatusHistory
          fields = ['instance', 'created_by']
  
  
  
  class InstanceStatusHistoryViewSet(MultipleFieldLookup, AuthReadOnlyViewSet):
  
      """
      API endpoint that allows instance tags to be viewed
      """
      queryset = InstanceStatusHistory.objects.all()
      serializer_class = InstanceStatusHistorySerializer
      ordering = ('-start_date', 'instance__id')
      ordering_fields = ('start_date', 'instance__id')
      lookup_fields = ("id", "uuid")
      filter_class = InstanceStatusHistoryFilter
      filter_backends = (filters.OrderingFilter, filters.DjangoFilterBackend)
  
      def get_queryset(self):
          """
          Filter out tags for deleted instances
          """
          user_id = self.request.user.id
          return InstanceStatusHistory.objects.filter(instance__created_by_id=user_id)
  
new_contents: from django.db.models import Q
  
  from rest_framework import filters
  import django_filters
  
  from core.models import InstanceStatusHistory
  
  from api.v2.serializers.details import InstanceStatusHistorySerializer
  from api.v2.views.base import AuthReadOnlyViewSet
  from api.v2.views.mixins import MultipleFieldLookup
  
  class InstanceStatusHistoryFilter(django_filters.FilterSet):
      instance = django_filters.MethodFilter(action='filter_instance_id')
      created_by = django_filters.CharFilter('instance__created_by__username')
  
      def filter_instance_id(self, queryset, value):
          try:
              int_val = int(value)
              return queryset.filter(
                      Q(instance__provider_alias=int_val)
                      | Q(instance_id=int_val))
          except ValueError:
              #Dealing with a UUID
              return queryset.filter(instance__provider_alias=value)
  
      class Meta:
          model = InstanceStatusHistory
          fields = ['instance', 'created_by']
  
  
  
  class InstanceStatusHistoryViewSet(MultipleFieldLookup, AuthReadOnlyViewSet):
  
      """
      API endpoint that allows instance tags to be viewed
      """
      queryset = InstanceStatusHistory.objects.all()
      serializer_class = InstanceStatusHistorySerializer
      ordering = ('-instance__start_date', 'instance__id')
      ordering_fields = ('-instance__start_date', 'instance__id')
      lookup_fields = ("id", "uuid")
      filter_class = InstanceStatusHistoryFilter
      filter_backends = (filters.OrderingFilter, filters.DjangoFilterBackend)
  
      def get_queryset(self):
          """
          Filter out tags for deleted instances
          """
          user_id = self.request.user.id
  
          if self.request.query_params.get('unique', "").lower() == 'true':
              return InstanceStatusHistory.objects.filter(instance__created_by_id=user_id).distinct('instance__start_date')
  
          return InstanceStatusHistory.objects.filter(instance__created_by_id=user_id)
  
subject: allow filtering for unique instance