fix(parsers): unblock source status and heavy product import

tests/apps/parsers/test_clients.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+from unittest.mock import patch
 from urllib.parse import urlparse
 
 import requests
@@ -22,6 +23,7 @@ from apps.parsers.clients.minpromtorg.schemas import (
 from apps.parsers.clients.proverki import ProverkiClient
 from apps.parsers.clients.proverki.schemas import Inspection
 from django.test import TestCase, tag
+from openpyxl import load_workbook as openpyxl_load_workbook
 from requests.adapters import BaseAdapter
 
 from tests.utils import Response, TestHTTPServer
@@ -513,6 +515,40 @@ class IndustrialProductsClientTest(TestCase):
 
         self.assertEqual(products, [])
 
+    def test_fetch_products_uses_read_only_workbook(self):
+        excel_bytes, rows = build_minpromtorg_products_excel(count=2)
+        file_name = "industrial_products_20260428.xlsx"
+
+        with TestHTTPServer() as server:
+            server.add_json(
+                "/api/kss-document-preview",
+                {
+                    "data": [
+                        {
+                            "name": IndustrialProductsClient().query,
+                            "files": [
+                                {"name": file_name, "url": f"/files/{file_name}"}
+                            ],
+                        }
+                    ]
+                },
+            )
+            server.add_bytes(f"/files/{file_name}", excel_bytes)
+
+            client = IndustrialProductsClient(
+                host=_host_from_base_url(server.base_url),
+                scheme="http",
+                http_adapter=server.adapter,
+            )
+            with patch(
+                "apps.parsers.clients.minpromtorg.products.load_workbook",
+                wraps=openpyxl_load_workbook,
+            ) as load_workbook_mock:
+                products = client.fetch_products()
+
+        self.assertEqual(len(products), len(rows))
+        self.assertTrue(load_workbook_mock.call_args.kwargs["read_only"])
+
     def test_get_latest_file_url_falls_back_to_excel_file(self):
         client = IndustrialProductsClient()
         files = [