feat(api): add API endpoints to add DCA entries and strategies

app/apps/api/views/dca.py

@@ -0,0 +1,41 @@
+from rest_framework import viewsets
+from rest_framework.decorators import action
+from rest_framework.response import Response
+from apps.dca.models import DCAStrategy, DCAEntry
+from apps.api.serializers import DCAStrategySerializer, DCAEntrySerializer
+
+
+class DCAStrategyViewSet(viewsets.ModelViewSet):
+    queryset = DCAStrategy.objects.all()
+    serializer_class = DCAStrategySerializer
+
+    @action(detail=True, methods=["get"])
+    def investment_frequency(self, request, pk=None):
+        strategy = self.get_object()
+        return Response(strategy.investment_frequency_data())
+
+    @action(detail=True, methods=["get"])
+    def price_comparison(self, request, pk=None):
+        strategy = self.get_object()
+        return Response(strategy.price_comparison_data())
+
+    @action(detail=True, methods=["get"])
+    def current_price(self, request, pk=None):
+        strategy = self.get_object()
+        price_data = strategy.current_price()
+        if price_data:
+            price, date = price_data
+            return Response({"price": price, "date": date})
+        return Response({"price": None, "date": None})
+
+
+class DCAEntryViewSet(viewsets.ModelViewSet):
+    queryset = DCAEntry.objects.all()
+    serializer_class = DCAEntrySerializer
+
+    def get_queryset(self):
+        queryset = DCAEntry.objects.all()
+        strategy_id = self.request.query_params.get("strategy", None)
+        if strategy_id is not None:
+            queryset = queryset.filter(strategy_id=strategy_id)
+        return queryset