diff --git a/code_review_graph/graph.py b/code_review_graph/graph.py
index 0e7054e..96591ef 100644
--- a/code_review_graph/graph.py
+++ b/code_review_graph/graph.py
@@ -170,6 +170,8 @@ def _invalidate_cache(self) -> None:
             self._stats_cache = None
 
     def close(self) -> None:
+        if self._conn.in_transaction:
+            self._conn.commit()
         self._conn.close()
 
     # --- Write operations ---
diff --git a/debug_test.py b/debug_test.py
new file mode 100644
index 0000000..97701b9
--- /dev/null
+++ b/debug_test.py
@@ -0,0 +1,26 @@
+
+import tempfile
+import gc
+import time
+from pathlib import Path
+
+def test_foo():
+    # Exact pattern from the test
+    tmp = tempfile.NamedTemporaryFile(suffix='.db', delete=False)
+    path = tmp.name
+    
+    # Don't close tmp, but use its name to open another connection
+    import sqlite3
+    conn = sqlite3.connect(path)
+    conn.execute('CREATE TABLE test (id INTEGER PRIMARY KEY)')
+    conn.commit()
+    
+    # Close the sqlite connection
+    conn.close()
+    
+    # Now try to delete via Path
+    try:
+        Path(path).unlink()
+        print("Deleted successfully")
+    except PermissionError as e:
+        print(f"Failed to delete: {e}")
diff --git a/tests/test_changes.py b/tests/test_changes.py
index 93562e2..c7649b7 100644
--- a/tests/test_changes.py
+++ b/tests/test_changes.py
@@ -23,6 +23,7 @@ def setup_method(self):
 
     def teardown_method(self):
         self.store.close()
+        self.tmp.close()
         Path(self.tmp.name).unlink(missing_ok=True)
 
     # -- helpers --
diff --git a/tests/test_communities.py b/tests/test_communities.py
index 74e5f8d..211ec78 100644
--- a/tests/test_communities.py
+++ b/tests/test_communities.py
@@ -26,6 +26,7 @@ def setup_method(self):
 
     def teardown_method(self):
         self.store.close()
+        self.tmp.close()
         Path(self.tmp.name).unlink(missing_ok=True)
 
     def _seed_two_clusters(self):
diff --git a/tests/test_flows.py b/tests/test_flows.py
index f7743b4..2dd8552 100644
--- a/tests/test_flows.py
+++ b/tests/test_flows.py
@@ -22,6 +22,7 @@ def setup_method(self):
 
     def teardown_method(self):
         self.store.close()
+        self.tmp.close()
         Path(self.tmp.name).unlink(missing_ok=True)
 
     # -- helpers --
diff --git a/tests/test_graph.py b/tests/test_graph.py
index 0aafe27..22ae56d 100644
--- a/tests/test_graph.py
+++ b/tests/test_graph.py
@@ -1,5 +1,6 @@
 """Tests for the graph storage and query engine."""
 
+import gc
 import tempfile
 from pathlib import Path
 
@@ -14,6 +15,8 @@ def setup_method(self):
 
     def teardown_method(self):
         self.store.close()
+        self.tmp.close()
+        gc.collect()
         Path(self.tmp.name).unlink(missing_ok=True)
 
     def _make_file_node(self, path="/test/file.py"):
diff --git a/tests/test_integration_v2.py b/tests/test_integration_v2.py
index 15773bf..26cbc6f 100644
--- a/tests/test_integration_v2.py
+++ b/tests/test_integration_v2.py
@@ -42,6 +42,7 @@ def setup_method(self):
 
     def teardown_method(self):
         self.store.close()
+        self.tmp.close()
         Path(self.tmp.name).unlink(missing_ok=True)
 
     # -----------------------------------------------------------------
diff --git a/tests/test_migrations.py b/tests/test_migrations.py
index ef45220..665e553 100644
--- a/tests/test_migrations.py
+++ b/tests/test_migrations.py
@@ -20,6 +20,7 @@ def setup_method(self):
 
     def teardown_method(self):
         self.store.close()
+        self.tmp.close()
         Path(self.tmp.name).unlink(missing_ok=True)
 
     def test_fresh_db_gets_latest_version(self):
diff --git a/tests/test_refactor.py b/tests/test_refactor.py
index 2ee55c4..9477dc8 100644
--- a/tests/test_refactor.py
+++ b/tests/test_refactor.py
@@ -28,6 +28,7 @@ def setup_method(self):
 
     def teardown_method(self):
         self.store.close()
+        self.tmp.close()
         Path(self.tmp.name).unlink(missing_ok=True)
         # Clean up pending refactors.
         with _refactor_lock:
@@ -115,6 +116,7 @@ def setup_method(self):
 
     def teardown_method(self):
         self.store.close()
+        self.tmp.close()
         Path(self.tmp.name).unlink(missing_ok=True)
 
     def _seed(self):
@@ -202,6 +204,7 @@ def setup_method(self):
 
     def teardown_method(self):
         self.store.close()
+        self.tmp.close()
         Path(self.tmp.name).unlink(missing_ok=True)
 
     def _seed(self):
diff --git a/tests/test_search.py b/tests/test_search.py
index 165ad83..b3dbad6 100644
--- a/tests/test_search.py
+++ b/tests/test_search.py
@@ -21,6 +21,7 @@ def setup_method(self):
 
     def teardown_method(self):
         self.store.close()
+        self.tmp.close()
         Path(self.tmp.name).unlink(missing_ok=True)
 
     def _seed_data(self):
diff --git a/tests/test_wiki.py b/tests/test_wiki.py
index 18212e7..e562d7d 100644
--- a/tests/test_wiki.py
+++ b/tests/test_wiki.py
@@ -22,6 +22,7 @@ def setup_method(self):
 
     def teardown_method(self):
         self.store.close()
+        self.tmp.close()
         Path(self.tmp.name).unlink(missing_ok=True)
         # Clean up wiki dir
         wiki_path = Path(self.wiki_dir)