Fix stale SDK index blocking scheduled updates

.github/workflows/update_sdk_details.yml

@@ -35,6 +35,9 @@ jobs:
           python -m pip install --upgrade pip
           pip install requests
 
+      - name: Refresh indexes from checked-out SDK data
+        run: python sdk-details/tools/build_indexes.py
+
       - name: Test SDK details tooling
         run: python sdk-details/tools/test.py
 

sdk-details/sdks/flutter/data/index.json

@@ -5147,6 +5147,18 @@
         }
       ]
     },
+    {
+      "engine": "af7e796e161ae0bb1ff0758c71a7105418bd9ded",
+      "releases": [
+        {
+          "flutter": "3.47.5",
+          "dart": "3.13.4",
+          "channel": "stable",
+          "framework": "6a19cca56475dbfba1478ee68d7bd0c2ef891da1",
+          "release_date": "2026-09-18T20:36:35.413968Z"
+        }
+      ]
+    },
     {
       "engine": "b04955656c87de0d80d259792e3a0e4a23b7c260",
       "releases": [

sdk-details/tools/tests/test_indexes.py

@@ -1,6 +1,8 @@
 import copy
 import json
 import re
+import tempfile
+from unittest.mock import patch
 from pathlib import Path
 import sys
 import unittest
@@ -31,3 +33,23 @@ def test_real_indexes_and_staged_definitions(self):
             self.assertIn('path_template',active['lookups'][0])
             bad=copy.deepcopy(definition);bad['lookups'][0]['index_path']='sdk-details/{value}.json'
             with self.assertRaises(ValueError):validate.validate_definition(candidate,bad)
+
+    def test_refresh_repairs_index_after_provider_data_changes(self):
+        with tempfile.TemporaryDirectory() as directory:
+            root=Path(directory)
+            sdk=root/'sdks/flutter';(sdk/'data/engine').mkdir(parents=True)
+            (sdk/'definition.json').write_text(json.dumps({'lookups':[]}))
+            (sdk/'data/engine/first.json').write_text(json.dumps({'engine':'first','releases':[]}))
+            original_outputs=build_indexes.outputs
+            with patch.object(build_indexes,'SOURCES',{'flutter':('engine','engine')}), patch.object(build_indexes,'outputs',lambda:original_outputs(root)):
+                build_indexes.build()
+                build_indexes.build(check=True)
+                (sdk/'data/engine/second.json').write_text(json.dumps({'engine':'second','releases':[]}))
+                with self.assertRaisesRegex(ValueError,'Stale SDK index'):
+                    build_indexes.build(check=True)
+                build_indexes.build()
+                build_indexes.build(check=True)
+                index=sdk/'data/index.json';before=index.read_bytes()
+                self.assertEqual(['first','second'],[entry['engine'] for entry in json.loads(before)['entries']])
+                build_indexes.build()
+                self.assertEqual(before,index.read_bytes())