feat: reserve queue capacity for recent models

tests/test_modelscope_discovery.py

@@ -47,7 +47,27 @@ class RateLimitedPageClient:
         return {"success": True, "data": {"models": items}}
 
 
+class ModelMetadataClient:
+    def __init__(self) -> None:
+        self.calls = 0
+
+    def request_json(self, _method: str, _path: str, **_kwargs) -> dict:  # noqa: ANN003
+        self.calls += 1
+        return {"Code": 200, "Data": {"LastUpdatedTime": 1786294389}}
+
+
 class ModelScopeDiscoveryTests(unittest.TestCase):
+    def test_model_last_modified_uses_detail_api_and_is_cached(self) -> None:
+        metadata_client = ModelMetadataClient()
+        discovery = HuggingFaceDiscovery(legacy_http_client=metadata_client)  # type: ignore[arg-type]
+
+        first = discovery.get_model_last_modified("owner/model")
+        second = discovery.get_model_last_modified("owner/model")
+
+        self.assertEqual(first, second)
+        self.assertEqual(1786294389, int(first.timestamp()))  # type: ignore[union-attr]
+        self.assertEqual(1, metadata_client.calls)
+
     def test_openapi_page_size_never_exceeds_platform_limit(self) -> None:
         http_client = RecordingHttpClient()
         discovery = HuggingFaceDiscovery(http_client=http_client)  # type: ignore[arg-type]