added data saving feature

python_app/gui/controllers/app_window_pipeline_mixin.py

@@ -281,6 +281,9 @@ class AppWindowPipelineMixin:
         else:
             self._supervisor.stop()
             self._drain_rings_once_for_history()
+        # Flush any in-progress disk recording so its buffered (not-yet-full) chunk is
+        # written rather than lost; the drains above already captured the last data.
+        self._finalize_recording_on_stop()
         keep_results_reader = self._supervisor.is_processor_running()
         self._close_readers(keep_results=keep_results_reader)
         self._single_capture_active = False
@@ -340,6 +343,7 @@ class AppWindowPipelineMixin:
                 self._read_all_raw()
             self._read_all_preprocessed()
             result_latest = self._read_all_results() if self._result_reader is not None else None
+            self._poll_recording_writer()  # finalize a disk recording once its writer drains
             self._update_history_indicator()
             self._last_reader_error_signature = None
             self._reader_error_repeat_count = 0
@@ -550,6 +554,7 @@ class AppWindowPipelineMixin:
             if collection is None:
                 break
             self._raw_history.append(collection)
+            self._record_collection("raw", collection)
             latest = collection
             # `capture_*_ns` are populated by the C++ sweep_orchestrator with
             # wallclocks captured around the actual device read. Pre-orchestrator
@@ -573,6 +578,7 @@ class AppWindowPipelineMixin:
             if collection is None:
                 break
             self._pre_history.append(collection)
+            self._record_collection("preprocessed", collection)
 
     def _read_all_results(self) -> ResultCollection | None:
         """Read available result collections from results ring."""
@@ -585,6 +591,7 @@ class AppWindowPipelineMixin:
                 break
             self._pipeline_metrics.record("processing", int(collection.processing_duration_ns))
             record_result_history(self._result_history, collection)
+            self._record_collection("results", collection)
             latest = collection
         return latest