Test first-application count after CSV reconciliation

Author: charlesmartin14

tests/test_wwpgd_projection_dose.py

@@ -6,7 +6,7 @@
 
 import pytest
 
-from wwgpt.checkpointing import append_csv_records
+from wwgpt.checkpointing import append_csv_records, csv_commit, reconcile_csv_artifacts
 
 
 DOSE_DEFINITION = (
@@ -101,6 +101,23 @@ def test_layer_application_index_survives_sequential_appends(tmp_path):
     assert int(rows[2]["projection_event_number"]) == 3
 
 
+def test_reconciled_uncommitted_suffix_does_not_advance_application_count(tmp_path):
+    path = tmp_path / "wwpgd_projection.csv"
+    append_csv_records(path, [_projection_row(event=0, step=10, dose=0.05, changed=True)])
+    committed = csv_commit(path)
+
+    # Simulate rows flushed after the last durable checkpoint, then a restart.
+    append_csv_records(path, [_projection_row(event=1, step=20, dose=0.04, changed=True)])
+    assert int(_read_rows(path)[-1]["layer_application_index"]) == 2
+    reconcile_csv_artifacts(tmp_path, {path.name: committed})
+
+    append_csv_records(path, [_projection_row(event=2, step=30, dose=0.03, changed=True)])
+    rows = _read_rows(path)
+    assert len(rows) == 2
+    assert int(rows[-1]["layer_application_index"]) == 2
+    assert rows[-1]["is_first_applied_projection"] == "False"
+
+
 def test_first_application_is_tracked_independently_per_layer(tmp_path):
     path = tmp_path / "wwpgd_projection.csv"
     append_csv_records(