Fix admin API gaps for users, exchange checks, and parser logs

src/apps/exchange/views.py

@@ -78,6 +78,48 @@ class ExchangeConnectionListCreateView(APIView):
         return api_created_response(output.data)
 
 
+class ExchangeConnectionTestView(APIView):
+    """API проверки подключения к внешней БД без сохранения."""
+
+    permission_classes = [IsAdminUser]
+
+    @swagger_auto_schema(
+        tags=[EXCHANGE_TAG],
+        operation_summary="Проверить подключение",
+        operation_description=(
+            "Проверяет подключение и структуру целевой БД без сохранения "
+            "настроек подключения."
+        ),
+        request_body=ExchangeConnectionCreateSerializer,
+        responses={
+            200: openapi.Response(
+                description="Проверка успешна",
+                schema=openapi.Schema(
+                    type=openapi.TYPE_OBJECT,
+                    properties={
+                        "status": openapi.Schema(type=openapi.TYPE_STRING),
+                        "message": openapi.Schema(type=openapi.TYPE_STRING),
+                    },
+                ),
+            ),
+            400: CommonResponses.BAD_REQUEST,
+            **ErrorResponses.ADMIN,
+        },
+    )
+    def post(self, request):
+        serializer = ExchangeConnectionCreateSerializer(data=request.data)
+        serializer.is_valid(raise_exception=True)
+
+        try:
+            result = ExchangeConnectionService.test_connection_payload(
+                **serializer.validated_data
+            )
+        except ExchangeServiceError as exc:
+            raise ValidationError({"connection": str(exc)}) from exc
+
+        return api_response(result, status_code=status.HTTP_200_OK)
+
+
 class ExchangeCopyDataView(APIView):
     """API запуска копирования данных в целевую БД."""