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

src/apps/exchange/services.py

@@ -29,6 +29,27 @@ class ExchangeConnectionService:
         "parsers.FinancialReportLine",
     ]
 
+    @classmethod
+    def test_connection_payload(cls, **payload) -> dict[str, str]:
+        """Проверить подключение и структуру без сохранения в БД."""
+        connection = ExchangeConnection(is_active=False, **payload)
+        alias = cls.test_connection(connection)
+        cls.validate_target_structure(
+            connection=connection,
+            alias=alias,
+            schema_name=connection.schema_name,
+        )
+
+        with suppress(Exception):
+            connections[alias].close()
+        with suppress(Exception):
+            connections.databases.pop(alias, None)
+
+        return {
+            "status": "success",
+            "message": "Подключение и структура целевой БД валидны.",
+        }
+
     @classmethod
     @transaction.atomic
     def create_active_connection_and_prepare(cls, **payload) -> ExchangeConnection:
@@ -456,4 +477,7 @@ class ExchangeConnectionService:
     ) -> None:
         connection.last_checked_at = timezone.now()
         connection.last_error = error_message
-        connection.save(update_fields=["last_checked_at", "last_error", "updated_at"])
+        if connection.pk:
+            connection.save(
+                update_fields=["last_checked_at", "last_error", "updated_at"]
+            )

src/apps/exchange/urls.py

@@ -1,6 +1,10 @@
 """URL конфигурация приложения exchange."""
 
-from apps.exchange.views import ExchangeConnectionListCreateView, ExchangeCopyDataView
+from apps.exchange.views import (
+    ExchangeConnectionListCreateView,
+    ExchangeConnectionTestView,
+    ExchangeCopyDataView,
+)
 from django.urls import path
 
 app_name = "exchange"
@@ -9,6 +13,11 @@ exchange_urlpatterns = [
     path(
         "connections/", ExchangeConnectionListCreateView.as_view(), name="connections"
     ),
+    path(
+        "connections/test/",
+        ExchangeConnectionTestView.as_view(),
+        name="connections-test",
+    ),
     path("copy/", ExchangeCopyDataView.as_view(), name="copy"),
 ]
 

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."""