Add quarterly api endpoint

nummi/api/urls.py

@@ -7,4 +7,5 @@ urlpatterns = [
     path("categories", views.CategoryListView.as_view(), name="categories"),
     path("accounts", views.AccountListView.as_view(), name="accounts"),
     path("snapshots", views.SnapshotListView.as_view(), name="snapshots"),
+    path("history", views.HistoryView.as_view(), name="history"),
 ]

nummi/api/views.py

@@ -1,3 +1,5 @@
+from django.db.models import Sum
+from django.db.models.functions import ExtractQuarter, ExtractYear
 from django.http import JsonResponse
 from django.views import View
 from django.views.generic.list import MultipleObjectMixin
@@ -32,3 +34,18 @@ class SnapshotListView(UserMixin, MultipleObjectMixin, View):
 
     def get(self, request, *args, **kwargs):
         return JsonResponse({"snapshots": list(self.get_queryset().values())})
+
+
+class HistoryView(UserMixin, MultipleObjectMixin, View):
+    model = Transaction
+
+    def get(self, request, *args, **kwargs):
+        return JsonResponse(
+            {
+                "data": list(
+                    self.get_queryset()
+                    .values("category__name", quarter=ExtractQuarter("date"), year=ExtractYear("date"))
+                    .annotate(Sum("value"))
+                )
+            }
+        )