From 9fcafc290c5b5ee9cb83c4c3b2ff600f75210c8e Mon Sep 17 00:00:00 2001
From: Andraxion <administrator@andraxion.net>
Date: Sat, 25 Jul 2026 20:00:21 -0400
Subject: [PATCH] Avoid rewriting warm extraction cache

---
 src/docforge/adapter_contract.py | 36 ++++++++++++++++----------------
 tests/test_adapter_contract.py   |  3 +++
 2 files changed, 21 insertions(+), 18 deletions(-)

diff --git a/src/docforge/adapter_contract.py b/src/docforge/adapter_contract.py
index 0c24f35..a4b6bab 100644
--- a/src/docforge/adapter_contract.py
+++ b/src/docforge/adapter_contract.py
@@ -483,14 +483,7 @@ class AdapterProject:
             if source.source_id in invalidated:
                 contribution = loader.extract_source(source)
                 reparsed.append(source.source_id)
-            else:
-                record = cached[source.source_id]
-                contribution = source_projection(record.payload)
-                hits.append(source.source_id)
-            validate_source_projection(source, contribution)
-            contributions.append(contribution)
-            cache_records.append(
-                CachedSource(
+                cache_record = CachedSource(
                     source_id=source.source_id,
                     source_path=source.source_path,
                     fingerprint=source.fingerprint,
@@ -498,7 +491,13 @@ class AdapterProject:
                     dependencies=source.dependencies,
                     payload=source_payload(contribution),
                 )
-            )
+            else:
+                cache_record = cached[source.source_id]
+                contribution = source_projection(cache_record.payload)
+                hits.append(source.source_id)
+            validate_source_projection(source, contribution)
+            contributions.append(contribution)
+            cache_records.append(cache_record)
         projection = AdapterProjection(
             project_id=manifest.project_id,
             title=manifest.title,
@@ -542,15 +541,16 @@ class AdapterProject:
             raise DocForgeError(
                 "source_changed", "Adapter sources changed during incremental extraction"
             )
-        write_extraction_cache(
-            self._cache_path,
-            ExtractionCache(
-                project_id=manifest.project_id,
-                adapter_id=manifest.adapter_id,
-                adapter_version=manifest.adapter_version,
-                sources=tuple(cache_records),
-            ),
-        )
+        if cache is None or invalidated or deleted:
+            write_extraction_cache(
+                self._cache_path,
+                ExtractionCache(
+                    project_id=manifest.project_id,
+                    adapter_id=manifest.adapter_id,
+                    adapter_version=manifest.adapter_version,
+                    sources=tuple(cache_records),
+                ),
+            )
         self._last_logic = logic_projections
         self._last_build_report = {
             "mode": "incremental",
diff --git a/tests/test_adapter_contract.py b/tests/test_adapter_contract.py
index 99355a8..69815ca 100644
--- a/tests/test_adapter_contract.py
+++ b/tests/test_adapter_contract.py
@@ -303,11 +303,14 @@ class AdapterContractTests(unittest.TestCase):
             self.assertEqual(2, first["build"]["reparsed_sources"])
             self.assertEqual(0, first["build"]["cache_hits"])
             loader.extract_calls.clear()
+            cache_path = root / ".cache" / "incremental" / "extractions.json"
+            cache_modified = cache_path.stat().st_mtime_ns
 
             second = index.build()
             self.assertEqual([], loader.extract_calls)
             self.assertEqual(0, second["build"]["reparsed_sources"])
             self.assertEqual(2, second["build"]["cache_hits"])
+            self.assertEqual(cache_modified, cache_path.stat().st_mtime_ns)
 
             loader.sources["guide.foundation"] = "Changed foundation."
             loader.extract_calls.clear()