added a bscan extension

python_app/models/gui_profile_codec.py

@@ -244,6 +244,12 @@ def gui_profile_from_dict(payload: dict[str, Any]) -> GuiProfileModel:
                 gui.processing.bscan.subtract_mean_ascan,
                 "gui.processing.bscan",
             ),
+            history_window_scans=_optional_int(
+                bscan_object,
+                "history_window_scans",
+                gui.processing.bscan.history_window_scans,
+                "gui.processing.bscan",
+            ),
         ),
         gpr=GuiGprStateModel(
             input_positions=_optional_string(
@@ -579,6 +585,7 @@ def gui_profile_to_dict(model: GuiProfileModel) -> dict[str, Any]:
                 "start_freq_mhz": gui.processing.bscan.start_freq_mhz,
                 "stop_freq_mhz": gui.processing.bscan.stop_freq_mhz,
                 "subtract_mean_ascan": gui.processing.bscan.subtract_mean_ascan,
+                "history_window_scans": gui.processing.bscan.history_window_scans,
             },
             "gpr": {
                 "input_positions": gui.processing.gpr.input_positions,

python_app/models/gui_profile_schema.py

@@ -48,6 +48,10 @@ class GuiBscanStateModel:
     start_freq_mhz: float = 100.0
     stop_freq_mhz: float = 8800.0
     subtract_mean_ascan: bool = False
+    # How many past sweeps the B-scan heatmap renders once acquisition is stopped.
+    # While running the window stays at the C++ replay window (see
+    # `_cpp_bscan_replay_window_for_config`); this only widens the stopped-mode view.
+    history_window_scans: int = 50
 
 
 @dataclass(slots=True)