feat: add device browser to menu

Automatically generated by python-semantic-release

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"

CHANGELOG.md

@@ -1,6 +1,138 @@
 # CHANGELOG
 
 
+## v2.41.1 (2025-10-15)
+
+### Bug Fixes
+
+- **dependencies**: Bec lib versions fixed
+  ([`3941050`](https://github.com/bec-project/bec_widgets/commit/3941050883a791f800ab7178af2435ac14f837b6))
+
+
+## v2.41.0 (2025-10-15)
+
+### Bug Fixes
+
+- **image_roi**: Delete button added to compact version
+  ([`ef27de4`](https://github.com/bec-project/bec_widgets/commit/ef27de40ceee8375d95a0f3a8e451b7d05d0ae2c))
+
+- **image_roi**: Rois can be removed with right click context menu
+  ([`37df95e`](https://github.com/bec-project/bec_widgets/commit/37df95ead8d6a07a6c5794a97a486d9f380004cc))
+
+### Build System
+
+- **bec_lib**: Version bump to 3.69.3
+  ([`28ac9c5`](https://github.com/bec-project/bec_widgets/commit/28ac9c5cc369bdfa712c70c45591243631c65066))
+
+### Features
+
+- **image_roi_tree**: Compact mode added
+  ([`c87a6cf`](https://github.com/bec-project/bec_widgets/commit/c87a6cfce9c36588b32f5279e63072bc2646c36f))
+
+### Refactoring
+
+- **serializer**: Upgrade to new serializer interface
+  ([`3d807ea`](https://github.com/bec-project/bec_widgets/commit/3d807eaa63980fd2bb11661696c4d8548fffde8c))
+
+### Testing
+
+- **deviceconfig-form-update**: Add onFailure default to test
+  ([`1dd20d5`](https://github.com/bec-project/bec_widgets/commit/1dd20d5986485f3bfe7ee02596ca23027ec4b756))
+
+
+## v2.40.0 (2025-10-08)
+
+### Bug Fixes
+
+- **curve_tree**: Fetching scan numbers directly from the bec client
+  ([`8111a4a`](https://github.com/bec-project/bec_widgets/commit/8111a4a21b7c1bd75316e9a1f1166b88ea52326d))
+
+- **curve_tree**: Safeguard fetching scan numbers from BEC client
+  ([`df8065e`](https://github.com/bec-project/bec_widgets/commit/df8065ea4000b24235520756515aa18f812bb390))
+
+- **curve_tree**: Scans are always fetched by scan ids
+  ([`20a59af`](https://github.com/bec-project/bec_widgets/commit/20a59af648a9808057df2226a3a3c12893cc5059))
+
+- **waveform**: Cleanup of scan_history dialog if not closed manually before widget
+  ([`d681ba5`](https://github.com/bec-project/bec_widgets/commit/d681ba538be9ccec45a1ebd412cbc33c8c7c0ae2))
+
+- **waveform**: Fetching scan number is not done from list but from .get_by_scan_number
+  ([`962ab77`](https://github.com/bec-project/bec_widgets/commit/962ab774e6afc73a321a5680e2862d9e41812888))
+
+- **waveform**: If scan id and scan number is provided, the scan is fetched from the scan id
+  ([`e59f27a`](https://github.com/bec-project/bec_widgets/commit/e59f27a22de490768c814c80642a7a91bebfef5b))
+
+- **waveform**: Safeguard added to the fetching history data
+  ([`540cfc3`](https://github.com/bec-project/bec_widgets/commit/540cfc37be65afcf721773564adc85de681a9d07))
+
+- **waveform**: Safeguard for _scan_history_closed
+  ([`2bf4896`](https://github.com/bec-project/bec_widgets/commit/2bf489600e96bb5b47d89bed261614f62c970ca9))
+
+- **waveform**: Safeguard for if scan_item is a list
+  ([`7e88a00`](https://github.com/bec-project/bec_widgets/commit/7e88a002b6ca40fc85fde993282b8706f140d9aa))
+
+- **waveform**: Update x suffix label with x property change, do not wait for next update cycle
+  ([`d19001c`](https://github.com/bec-project/bec_widgets/commit/d19001c94e652c0c3e18f8d7903fd1ccff1111cd))
+
+- **waveform**: X_data checked with is scalar instead of len()
+  ([`db7dd4f`](https://github.com/bec-project/bec_widgets/commit/db7dd4f8d4b1210e65c852f6193fc8cf0f4809a5))
+
+### Build System
+
+- **bec_lib**: Bec_lib dependency raised to 3.68
+  ([`2f3dc2c`](https://github.com/bec-project/bec_widgets/commit/2f3dc2ce6b7133fc5582bd6996a674590cf1002d))
+
+### Chores
+
+- Add dependabot config
+  ([`f25f865`](https://github.com/bec-project/bec_widgets/commit/f25f86522f0a2e9dd24ca862ea8de89873951f83))
+
+### Features
+
+- **waveform**: New type of curve - history curve
+  ([`f083dff`](https://github.com/bec-project/bec_widgets/commit/f083dff6128c6256443b49f54ab12b54f1b90d66))
+
+### Refactoring
+
+- **test_waveform**: Test waveform renamed
+  ([`2f798be`](https://github.com/bec-project/bec_widgets/commit/2f798be7b0d43d304ccbd0e992a9d62f1aa1dd5f))
+
+- **waveform**: Separate method to fetch scan item from history
+  ([`4be7058`](https://github.com/bec-project/bec_widgets/commit/4be70580a60293204b135c6ea77978f1dcf8aa5f))
+
+### Testing
+
+- **conftest**: Suppress_message_box for error popups fixture autouse True
+  ([`0844a9e`](https://github.com/bec-project/bec_widgets/commit/0844a9e11975a34780b1dc413f5145517d1a1a22))
+
+- **plotting_framework_e2e**: Fetching history curve
+  ([`a006f95`](https://github.com/bec-project/bec_widgets/commit/a006f95f211ad115019967e365a6627d9678a1e3))
+
+- **waveform,curve_tree**: Test extended to cover history curve behaviour
+  ([`5a5d323`](https://github.com/bec-project/bec_widgets/commit/5a5d32312b08e1edeb69243daddfaaa9bac22273))
+
+
+## v2.39.1 (2025-10-07)
+
+### Bug Fixes
+
+- Explicitly pass the cached readout flag
+  ([`50696bc`](https://github.com/bec-project/bec_widgets/commit/50696bce4ce14c61b4bdda8c6fb40967972e6b23))
+
+
+## v2.39.0 (2025-09-24)
+
+### Bug Fixes
+
+- **rpc**: Fix hide/show
+  ([`975404f`](https://github.com/bec-project/bec_widgets/commit/975404f483ddae041d9f4d819f39c53cec191439))
+
+### Features
+
+- **rpc_base**: Windows can be raised to front from CLI
+  ([`565c0bd`](https://github.com/bec-project/bec_widgets/commit/565c0bd1e7f4684d8401b6a2827c35422b1125c4))
+
+
 ## v2.38.4 (2025-09-23)
 
 ### Bug Fixes

bec_widgets/cli/client.py

@@ -5079,6 +5079,8 @@ class Waveform(RPCBase):
         color: "str | None" = None,
         label: "str | None" = None,
         dap: "str | None" = None,
+        scan_id: "str | None" = None,
+        scan_number: "int | None" = None,
         **kwargs,
     ) -> "Curve":
         """
@@ -5101,6 +5103,10 @@ class Waveform(RPCBase):
             dap(str): The dap model to use for the curve, only available for sync devices.
             If not specified, none will be added.
             Use the same string as is the name of the LMFit model.
+            scan_id(str):  Optional scan ID. When provided, the curve is treated as a **history** curve and
+                the y‑data (and optional x‑data) are fetched from that historical scan. Such curves are
+                never cleared by live‑scan resets.
+            scan_number(int): Optional scan index. When provided, the curve is treated as a **history** curve and
 
         Returns:
             Curve: The curve object.
@@ -5143,11 +5149,11 @@ class Waveform(RPCBase):
     def update_with_scan_history(self, scan_index: "int" = None, scan_id: "str" = None):
         """
         Update the scan curves with the data from the scan storage.
-        Provide only one of scan_id or scan_index.
+        If both arguments are provided, scan_id takes precedence and scan_index is ignored.
 
         Args:
             scan_id(str, optional): ScanID of the scan to be updated. Defaults to None.
-            scan_index(int, optional): Index of the scan to be updated. Defaults to None.
+            scan_index(int, optional): Index (scan number) of the scan to be updated. Defaults to None.
         """
 
     @rpc_call

bec_widgets/cli/client_utils.py

@@ -285,6 +285,18 @@ class BECGuiClient(RPCBase):
         """Hide the GUI window."""
         return self._hide_all()
 
+    def raise_window(self, wait: bool = True) -> None:
+        """
+        Bring GUI windows to the front.
+        If the GUI server is not running, it will be started.
+
+        Args:
+            wait(bool): Whether to wait for the server to start. Defaults to True.
+        """
+        if self._check_if_server_is_alive():
+            return self._raise_all()
+        return self._start(wait=wait)
+
     def new(
         self,
         name: str | None = None,
@@ -443,8 +455,8 @@ class BECGuiClient(RPCBase):
         self._update_dynamic_namespace(self._server_registry)
 
     def _do_show_all(self):
-        rpc_client = RPCBase(gui_id=f"{self._gui_id}:launcher", parent=self)
-        rpc_client._run_rpc("show")  # pylint: disable=protected-access
+        if self.launcher and len(self._top_level) == 0:
+            self.launcher._run_rpc("show")  # pylint: disable=protected-access
         for window in self._top_level.values():
             window.show()
 
@@ -454,11 +466,24 @@ class BECGuiClient(RPCBase):
 
     def _hide_all(self):
         with wait_for_server(self):
-            rpc_client = RPCBase(gui_id=f"{self._gui_id}:launcher", parent=self)
-            rpc_client._run_rpc("hide")  # pylint: disable=protected-access
-            if not self._killed:
-                for window in self._top_level.values():
-                    window.hide()
+            if self._killed:
+                return
+            self.launcher._run_rpc("hide")
+            for window in self._top_level.values():
+                window.hide()
+
+    def _do_raise_all(self):
+        """Bring GUI windows to the front."""
+        if self.launcher and len(self._top_level) == 0:
+            self.launcher._run_rpc("raise")  # pylint: disable=protected-access
+        for window in self._top_level.values():
+            window._run_rpc("raise")  # type: ignore[attr-defined]
+
+    def _raise_all(self):
+        with wait_for_server(self):
+            if self._killed:
+                return
+            return self._do_raise_all()
 
     def _update_dynamic_namespace(self, server_registry: dict):
         """

bec_widgets/cli/rpc/rpc_base.py

@@ -202,6 +202,11 @@ class RPCBase:
             parent = parent._parent
         return parent  # type: ignore
 
+    def raise_window(self):
+        """Bring this widget (or its container) to the front."""
+        # Use explicit call to ensure action name is 'raise' (not 'raise_')
+        return self._run_rpc("raise")
+
     def _run_rpc(
         self,
         method,
@@ -225,6 +230,12 @@ class RPCBase:
         Returns:
             The result of the RPC call.
         """
+        if method in ["show", "hide", "raise"] and gui_id is None:
+            obj = self._root._server_registry.get(self._gui_id)
+            if obj is None:
+                raise ValueError(f"Widget {self._gui_id} not found.")
+            gui_id = obj.get("container_proxy")  # type: ignore
+
         request_id = str(uuid.uuid4())
         rpc_msg = messages.GUIInstructionMessage(
             action=method,

bec_widgets/examples/jupyter_console/jupyter_console_window.py

@@ -55,7 +55,7 @@ class JupyterConsoleWindow(QWidget):  # pragma: no cover:
                     # "btn6": self.btn6,
                     # "pb": self.pb,
                     # "pi": self.pi,
-                    # "wf": self.wf,
+                    "wf": self.wf,
                     # "scatter": self.scatter,
                     # "scatter_mi": self.scatter,
                     # "mwf": self.mwf,
@@ -105,12 +105,11 @@ class JupyterConsoleWindow(QWidget):  # pragma: no cover:
         # self.btn5 = QPushButton("Button 5")
         # self.btn6 = QPushButton("Button 6")
         #
-        # fifth_tab = QWidget()
-        # fifth_tab_layout = QVBoxLayout(fifth_tab)
-        # self.wf = Waveform()
-        # fifth_tab_layout.addWidget(self.wf)
-        # tab_widget.addTab(fifth_tab, "Waveform Next Gen")
-        # tab_widget.setCurrentIndex(4)
+        fifth_tab = QWidget()
+        fifth_tab_layout = QVBoxLayout(fifth_tab)
+        self.wf = Waveform()
+        fifth_tab_layout.addWidget(self.wf)
+        tab_widget.addTab(fifth_tab, "Waveform Next Gen")
         #
         sixth_tab = QWidget()
         sixth_tab_layout = QVBoxLayout(sixth_tab)

bec_widgets/tests/utils.py

@@ -173,7 +173,7 @@ class FakePositioner(BECPositioner):
     def set_read_value(self, value):
         self.read_value = value
 
-    def read(self):
+    def read(self, cached=False):
         return self.signals
 
     def set_limits(self, limits):

bec_widgets/utils/compact_popup.py

@@ -1,5 +1,6 @@
 import time
 from types import SimpleNamespace
+from typing import Literal
 
 from bec_qthemes import material_icon
 from qtpy.QtCore import Property, Qt, Signal
@@ -39,7 +40,7 @@ class LedLabel(QLabel):
         self.setState("default")
         self.setFixedSize(20, 20)
 
-    def setState(self, state: str):
+    def setState(self, state: Literal["success", "default", "warning", "emergency"]):
         match state:
             case "success":
                 r, g, b, a = self.palette.success.getRgb()

bec_widgets/utils/serialization.py

@@ -1,44 +1,25 @@
+from bec_lib.codecs import BECCodec
 from bec_lib.serialization import msgpack
 from qtpy.QtCore import QPointF
 
 
+class QPointFEncoder(BECCodec):
+    obj_type = QPointF
+
+    @staticmethod
+    def encode(obj: QPointF) -> list[float]:
+        """Encode a QPointF object to a list of floats."""
+        return [obj.x(), obj.y()]
+
+    @staticmethod
+    def decode(type_name: str, data: list[float]) -> list[float]:
+        """No-op function since QPointF is encoded as a list of floats."""
+        return data
+
+
 def register_serializer_extension():
     """
     Register the serializer extension for the BECConnector.
     """
-    if not module_is_registered("bec_widgets.utils.serialization"):
-        msgpack.register_object_hook(encode_qpointf, decode_qpointf)
-
-
-def module_is_registered(module_name: str) -> bool:
-    """
-    Check if the module is registered in the encoder.
-
-    Args:
-        module_name (str): The name of the module to check.
-
-    Returns:
-        bool: True if the module is registered, False otherwise.
-    """
-    # pylint: disable=protected-access
-    for enc in msgpack._encoder:
-        if enc[0].__module__ == module_name:
-            return True
-    return False
-
-
-def encode_qpointf(obj):
-    """
-    Encode a QPointF object to a list of floats. As this is mostly used for sending
-    data to the client, it is not necessary to convert it back to a QPointF object.
-    """
-    if isinstance(obj, QPointF):
-        return [obj.x(), obj.y()]
-    return obj
-
-
-def decode_qpointf(obj):
-    """
-    no-op function since QPointF is encoded as a list of floats.
-    """
-    return obj
+    if not msgpack.is_registered(QPointF):
+        msgpack.register(QPointF, QPointFEncoder.encode, QPointFEncoder.decode)

bec_widgets/widgets/containers/dock/dock_area.py

@@ -37,6 +37,7 @@ from bec_widgets.widgets.plots.waveform.waveform import Waveform
 from bec_widgets.widgets.progress.ring_progress_bar.ring_progress_bar import RingProgressBar
 from bec_widgets.widgets.services.bec_queue.bec_queue import BECQueue
 from bec_widgets.widgets.services.bec_status_box.bec_status_box import BECStatusBox
+from bec_widgets.widgets.services.device_browser.device_browser import DeviceBrowser
 from bec_widgets.widgets.utility.logpanel.logpanel import LogPanel
 from bec_widgets.widgets.utility.visual.dark_mode_button.dark_mode_button import DarkModeButton
 
@@ -185,6 +186,12 @@ class BECDockArea(BECWidget, QWidget):
                         filled=True,
                         parent=self,
                     ),
+                    "device_browser": MaterialIconAction(
+                        icon_name=DeviceBrowser.ICON_NAME,
+                        tooltip="Add Device Browser",
+                        filled=True,
+                        parent=self,
+                    ),
                 },
             ),
         )
@@ -312,6 +319,9 @@ class BECDockArea(BECWidget, QWidget):
         menu_devices.actions["positioner_box"].action.triggered.connect(
             lambda: self._create_widget_from_toolbar(widget_name="PositionerBox")
         )
+        menu_devices.actions["device_browser"].action.triggered.connect(
+            lambda: self._create_widget_from_toolbar(widget_name="DeviceBrowser")
+        )
 
         # Menu Utils
         menu_utils.actions["queue"].action.triggered.connect(

bec_widgets/widgets/control/device_control/positioner_box/_base/positioner_box_base.py

@@ -88,7 +88,7 @@ class PositionerBoxBase(BECWidget, CompactPopupWidget):
         if not self._check_device_is_valid(device):
             return
 
-        data = self.dev[device].read()
+        data = self.dev[device].read(cached=True)
         self._on_device_readback(
             device,
             self._device_ui_components(device),

bec_widgets/widgets/plots/image/setting_widgets/image_roi_tree.py

@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import math
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Literal
 
 from bec_lib import bec_logger
 from bec_qthemes import material_icon
@@ -73,11 +73,16 @@ class ROIPropertyTree(BECWidget, QWidget):
     - Children: type, line-width (spin box), coordinates (auto-updating).
 
     Args:
+        parent (QWidget, optional): Parent widget. Defaults to None.
         image_widget (Image): The main Image widget that displays the ImageItem.
             Provides ``plot_item`` and owns an ROIController already.
         controller (ROIController, optional): Optionally pass an external controller.
             If None, the manager uses ``image_widget.roi_controller``.
-        parent (QWidget, optional): Parent widget. Defaults to None.
+        compact (bool, optional): If True, use a compact mode with no tree view,
+            only a toolbar with draw actions. Defaults to False.
+        compact_orientation (str, optional): Orientation of the toolbar in compact mode.
+            Either "vertical" or "horizontal". Defaults to "vertical".
+        compact_color (str, optional): Color of the single active ROI in compact mode.
     """
 
     PLUGIN = False
@@ -92,11 +97,18 @@ class ROIPropertyTree(BECWidget, QWidget):
         parent: QWidget = None,
         image_widget: Image,
         controller: ROIController | None = None,
+        compact: bool = False,
+        compact_orientation: Literal["vertical", "horizontal"] = "vertical",
+        compact_color: str = "#f0f0f0",
     ):
 
         super().__init__(
             parent=parent, config=ConnectionConfig(widget_class=self.__class__.__name__)
         )
+        self.compact = compact
+        self.compact_orient = compact_orientation
+        self.compact_color = compact_color
+        self.single_active_roi: BaseROI | None = None
 
         if controller is None:
             # Use the controller already belonging to the Image widget
@@ -112,22 +124,29 @@ class ROIPropertyTree(BECWidget, QWidget):
 
         self.layout = QVBoxLayout(self)
         self._init_toolbar()
-        self._init_tree()
+        if not self.compact:
+            self._init_tree()
+        else:
+            self.tree = None
 
         # connect controller
         self.controller.roiAdded.connect(self._on_roi_added)
         self.controller.roiRemoved.connect(self._on_roi_removed)
-        self.controller.cleared.connect(self.tree.clear)
+        if not self.compact:
+            self.controller.cleared.connect(self.tree.clear)
 
         # initial load
         for r in self.controller.rois:
             self._on_roi_added(r)
 
-        self.tree.collapseAll()
+        if not self.compact:
+            self.tree.collapseAll()
 
     # --------------------------------------------------------------------- UI
     def _init_toolbar(self):
-        tb = self.toolbar = ModularToolBar(self, orientation="horizontal")
+        tb = self.toolbar = ModularToolBar(
+            self, orientation=self.compact_orient if self.compact else "horizontal"
+        )
         self._draw_actions: dict[str, MaterialIconAction] = {}
         # --- ROI draw actions (toggleable) ---
 
@@ -157,6 +176,29 @@ class ROIPropertyTree(BECWidget, QWidget):
         for mode, act in self._draw_actions.items():
             act.action.toggled.connect(lambda on, m=mode: self._on_draw_action_toggled(m, on))
 
+        if self.compact:
+            tb.components.add_safe(
+                "compact_delete",
+                MaterialIconAction("delete", "Delete Current Roi", checkable=False, parent=self),
+            )
+            bundle.add_action("compact_delete")
+            tb.components.get_action("compact_delete").action.triggered.connect(
+                lambda _: (
+                    self.controller.remove_roi(self.single_active_roi)
+                    if self.single_active_roi is not None
+                    else None
+                )
+            )
+            tb.show_bundles(["roi_draw"])
+            self.layout.addWidget(tb)
+
+            # ROI drawing state (needed even in compact mode)
+            self._roi_draw_mode = None
+            self._roi_start_pos = None
+            self._temp_roi = None
+            self.plot.scene().installEventFilter(self)
+            return
+
         # Expand/Collapse toggle
         self.expand_toggle = MaterialIconAction(
             "unfold_more", "Expand/Collapse", checkable=True, parent=self  # icon when collapsed
@@ -327,13 +369,21 @@ class ROIPropertyTree(BECWidget, QWidget):
             self._set_roi_draw_mode(None)
             # register via controller
             self.controller.add_roi(final_roi)
+            if self.compact:
+                final_roi.line_color = self.compact_color
             return True
         return super().eventFilter(obj, event)
 
     # --------------------------------------------------------- controller slots
     def _on_roi_added(self, roi: BaseROI):
+        if self.compact:
+            roi.line_color = self.compact_color
+            if self.single_active_roi is not None and self.single_active_roi is not roi:
+                self.controller.remove_roi(self.single_active_roi)
+            self.single_active_roi = roi
+            return
         # check the global setting from the toolbar
-        if self.lock_all_action.action.isChecked():
+        if hasattr(self, "lock_all_action") and self.lock_all_action.action.isChecked():
             roi.movable = False
         # parent row with blank action column, name in ROI column
         parent = QTreeWidgetItem(self.tree, ["", "", ""])
@@ -424,6 +474,10 @@ class ROIPropertyTree(BECWidget, QWidget):
         roi.movable = not roi.movable
 
     def _on_roi_removed(self, roi: BaseROI):
+        if self.compact:
+            if self.single_active_roi is roi:
+                self.single_active_roi = None
+            return
         item = self.roi_items.pop(roi, None)
         if item:
             idx = self.tree.indexOfTopLevelItem(item)
@@ -449,8 +503,9 @@ class ROIPropertyTree(BECWidget, QWidget):
         self.controller.remove_roi(roi)
 
     def cleanup(self):
-        self.cmap.close()
-        self.cmap.deleteLater()
+        if hasattr(self, "cmap"):
+            self.cmap.close()
+            self.cmap.deleteLater()
         if self.controller and hasattr(self.controller, "rois"):
             for roi in self.controller.rois:  # disconnect all signals from ROIs
                 try:
@@ -491,8 +546,8 @@ if __name__ == "__main__":  # pragma: no cover
     # Add the image widget on the left
     ml.addWidget(image_widget)
 
-    # ROI manager linked to that image
-    mgr = ROIPropertyTree(parent=image_widget, image_widget=image_widget)
+    # ROI manager linked to that image with compact mode
+    mgr = ROIPropertyTree(parent=image_widget, image_widget=image_widget, compact=True)
     mgr.setFixedWidth(350)
     ml.addWidget(mgr)
 

bec_widgets/widgets/plots/motor_map/motor_map.py

@@ -765,7 +765,7 @@ class MotorMap(PlotBase):
             float: Motor initial position.
         """
         entry = self.entry_validator.validate_signal(name, None)
-        init_position = round(float(self.dev[name].read()[entry]["value"]), precision)
+        init_position = round(float(self.dev[name].read(cached=True)[entry]["value"]), precision)
         return init_position
 
     def _sync_motor_map_selection_toolbar(self):

bec_widgets/widgets/plots/roi/image_roi.py

@@ -174,6 +174,8 @@ class BaseROI(BECConnector):
         self.remove_scale_handles()  # remove any existing handles from pyqtgraph.RectROI
         if movable:
             self.add_scale_handle()  # add custom scale handles
+        if hasattr(self, "sigRemoveRequested"):
+            self.sigRemoveRequested.connect(self.remove)
 
     def set_parent(self, parent: Image):
         """

bec_widgets/widgets/plots/waveform/curve.py

@@ -42,10 +42,15 @@ class CurveConfig(ConnectionConfig):
     pen_style: Literal["solid", "dash", "dot", "dashdot"] | None = Field(
         "solid", description="The style of the pen of the curve."
     )
-    source: Literal["device", "dap", "custom"] = Field(
+    source: Literal["device", "dap", "custom", "history"] = Field(
         "custom", description="The source of the curve."
     )
     signal: DeviceSignal | None = Field(None, description="The signal of the curve.")
+    scan_id: str | None = Field(None, description="Scan ID to be used when `source` is 'history'.")
+    scan_number: int | None = Field(
+        None, description="Scan index to be used when `source` is 'history'."
+    )
+    current_x_mode: str | None = Field(None, description="The current x mode of the history curve.")
     parent_label: str | None = Field(
         None, description="The label of the parent plot, only relevant for dap curves."
     )
@@ -199,7 +204,7 @@ class Curve(BECConnector, pg.PlotDataItem):
         Raises:
             ValueError: If the source is not custom.
         """
-        if self.config.source == "custom":
+        if self.config.source in ["custom", "history"]:
             self.setData(x, y)
         else:
             raise ValueError(f"Source {self.config.source} do not allow custom data setting.")

bec_widgets/widgets/plots/waveform/settings/curve_settings/curve_tree.py

@@ -5,7 +5,34 @@ from typing import TYPE_CHECKING
 
 from bec_lib.logger import bec_logger
 from bec_qthemes._icon.material_icons import material_icon
-from qtpy.QtCore import Qt
+from qtpy.QtGui import QValidator
+
+
+class ScanIndexValidator(QValidator):
+    """Validator to allow only 'live' or integer scan numbers from an allowed set."""
+
+    def __init__(self, allowed_scans: set[int] | None = None, parent=None):
+        super().__init__(parent)
+        self.allowed_scans = allowed_scans or set()
+
+    def validate(self, input_str: str, pos: int):
+        # Accept empty or 'live'
+        if input_str == "" or input_str == "live":
+            return QValidator.State.Acceptable, input_str, pos
+        # Allow partial editing of "live"
+        if "live".startswith(input_str):
+            return QValidator.State.Intermediate, input_str, pos
+        # Accept integer only if present in the allowed set
+        if input_str.isdigit():
+            try:
+                num = int(input_str)
+            except ValueError:
+                return QValidator.State.Invalid, input_str, pos
+            if num in self.allowed_scans:
+                return QValidator.State.Acceptable, input_str, pos
+        return QValidator.State.Invalid, input_str, pos
+
+
 from qtpy.QtWidgets import (
     QComboBox,
     QHBoxLayout,
@@ -91,8 +118,60 @@ class CurveRow(QTreeWidgetItem):
         # Create columns 1..2, depending on source
         self._init_source_ui()
         # Create columns 3..6 (color, style, width, symbol)
+        self._init_scan_index_ui()
         self._init_style_controls()
 
+    def _init_scan_index_ui(self):
+        """Create the Scan # editable combobox in column 3."""
+        if self.source not in ("device", "history"):
+            return
+        self.scan_index_combo = QComboBox()
+        self.scan_index_combo.setEditable(True)
+        # Populate 'live' and all available history scan indices
+        self.scan_index_combo.addItem("live", None)
+
+        scan_number_list = []
+        scan_id_list = []
+        try:
+            history = getattr(self.curve_tree.client, "history", None)
+            if history is not None:
+                scan_number_list = getattr(history, "_scan_numbers", []) or []
+                scan_id_list = getattr(history, "_scan_ids", []) or []
+        except Exception as e:
+            logger.error(f"Cannot fetch scan numbers from BEC client: {e}")
+            # If scan numbers cannot be fetched, only provide 'live' option
+            scan_number_list = []
+            scan_id_list = []
+
+        # Restrict input to 'live' or valid scan numbers
+        allowed = set()
+        try:
+            allowed = set(int(n) for n in scan_number_list if isinstance(n, (int, str)))
+        except Exception:
+            allowed = set()
+        validator = ScanIndexValidator(allowed, self.scan_index_combo)
+        self.scan_index_combo.lineEdit().setValidator(validator)
+
+        # Add items: show scan numbers, store scan IDs as item data
+        if scan_number_list and scan_id_list and len(scan_number_list) == len(scan_id_list):
+            for num, sid in zip(scan_number_list, scan_id_list):
+                self.scan_index_combo.addItem(str(num), sid)
+        else:
+            logger.error("Scan number and ID lists are mismatched or empty.")
+
+        # Select current based on existing config
+        selected = False
+        if getattr(self.config, "scan_id", None):  # scan_id matching only
+            for i in range(self.scan_index_combo.count()):
+                if self.scan_index_combo.itemData(i) == self.config.scan_id:
+                    self.scan_index_combo.setCurrentIndex(i)
+                    selected = True
+                    break
+        if not selected:
+            self.scan_index_combo.setCurrentText("live")
+
+        self.tree.setItemWidget(self, 3, self.scan_index_combo)
+
     def _init_actions(self):
         """Create the actions widget in column 0, including a delete button and maybe 'Add DAP'."""
         self.actions_widget = QWidget()
@@ -114,7 +193,7 @@ class CurveRow(QTreeWidgetItem):
         actions_layout.addWidget(self.delete_button)
 
         # If device row, add "Add DAP" button
-        if self.source == "device":
+        if self.source in ("device", "history"):
             self.add_dap_button = QPushButton("DAP")
             self.add_dap_button.clicked.connect(lambda: self.add_dap_row())
             actions_layout.addWidget(self.add_dap_button)
@@ -123,7 +202,7 @@ class CurveRow(QTreeWidgetItem):
 
     def _init_source_ui(self):
         """Create columns 1 and 2. For device rows, we have device/entry edits; for dap rows, label/model combo."""
-        if self.source == "device":
+        if self.source in ("device", "history"):
             # Device row: columns 1..2 are device line edits
             self.device_edit = DeviceComboBox(parent=self.tree)
             self.device_edit.insertItem(0, "")
@@ -152,7 +231,6 @@ class CurveRow(QTreeWidgetItem):
 
             self.tree.setItemWidget(self, 1, self.device_edit)
             self.tree.setItemWidget(self, 2, self.entry_edit)
-
         else:
             # DAP row: column1= "Model" label, column2= DapComboBox
             self.label_widget = QLabel("Model")
@@ -171,31 +249,31 @@ class CurveRow(QTreeWidgetItem):
             self.tree.setItemWidget(self, 2, self.dap_combo)
 
     def _init_style_controls(self):
-        """Create columns 3..6: color button, style combo, width spin, symbol spin."""
-        # Color in col 3
+        """Create columns 4..7: color button, style combo, width spin, symbol spin."""
+        # Color in col 4
         self.color_button = ColorButtonNative(color=self.config.color)
         self.color_button.color_changed.connect(self._on_color_changed)
-        self.tree.setItemWidget(self, 3, self.color_button)
+        self.tree.setItemWidget(self, 4, self.color_button)
 
-        # Style in col 4
+        # Style in col 5
         self.style_combo = QComboBox()
         self.style_combo.addItems(["solid", "dash", "dot", "dashdot"])
         idx = self.style_combo.findText(self.config.pen_style)
         if idx >= 0:
             self.style_combo.setCurrentIndex(idx)
-        self.tree.setItemWidget(self, 4, self.style_combo)
+        self.tree.setItemWidget(self, 5, self.style_combo)
 
-        # Pen width in col 5
+        # Pen width in col 6
         self.width_spin = QSpinBox()
         self.width_spin.setRange(1, 20)
         self.width_spin.setValue(self.config.pen_width)
-        self.tree.setItemWidget(self, 5, self.width_spin)
+        self.tree.setItemWidget(self, 6, self.width_spin)
 
-        # Symbol size in col 6
+        # Symbol size in col 7
         self.symbol_spin = QSpinBox()
         self.symbol_spin.setRange(1, 20)
         self.symbol_spin.setValue(self.config.symbol_size)
-        self.tree.setItemWidget(self, 6, self.symbol_spin)
+        self.tree.setItemWidget(self, 7, self.symbol_spin)
 
     @SafeSlot(str, verify_sender=True)
     def _on_color_changed(self, new_color: str):
@@ -209,8 +287,8 @@ class CurveRow(QTreeWidgetItem):
         self.config.symbol_color = new_color
 
     def add_dap_row(self):
-        """Create a new DAP row as a child. Only valid if source='device'."""
-        if self.source != "device":
+        """Create a new DAP row as a child. Only valid if source is 'device' or 'history'."""
+        if self.source not in ("device", "history"):
             return
         curve_tree = self.tree.parent()
         parent_label = self.config.label
@@ -288,7 +366,7 @@ class CurveRow(QTreeWidgetItem):
         Returns:
             dict: The serialized config based on the GUI state.
         """
-        if self.source == "device":
+        if self.source in ("device", "history"):
             # Gather device name/entry
             device_name = ""
             device_entry = ""
@@ -309,8 +387,23 @@ class CurveRow(QTreeWidgetItem):
                     )
 
             self.config.signal = DeviceSignal(name=device_name, entry=device_entry)
-            self.config.source = "device"
-            self.config.label = f"{device_name}-{device_entry}"
+            scan_combo_text = self.scan_index_combo.currentText()
+            if scan_combo_text == "live" or scan_combo_text == "":
+                self.config.scan_number = None
+                self.config.scan_id = None
+                self.config.source = "device"
+                self.config.label = f"{device_name}-{device_entry}"
+            if scan_combo_text.isdigit():
+                try:
+                    scan_num = int(scan_combo_text)
+                except ValueError:
+                    scan_num = None
+                self.config.scan_number = scan_num
+                self.config.scan_id = self.scan_index_combo.currentData()
+                self.config.source = "history"
+                # Label history curves with scan number suffix
+                if scan_num is not None:
+                    self.config.label = f"{device_name}-{device_entry}-scan-{scan_num}"
         else:
             # DAP logic
             parent_conf_dict = {}
@@ -443,10 +536,12 @@ class CurveTree(BECWidget, QWidget):
         self.toolbar.show_bundles(["curve_tree"])
 
     def _init_tree(self):
-        """Initialize the QTreeWidget with 7 columns and compact widths."""
+        """Initialize the QTreeWidget with 8 columns and compact widths."""
         self.tree = QTreeWidget()
-        self.tree.setColumnCount(7)
-        self.tree.setHeaderLabels(["Actions", "Name", "Entry", "Color", "Style", "Width", "Symbol"])
+        self.tree.setColumnCount(8)
+        self.tree.setHeaderLabels(
+            ["Actions", "Name", "Entry", "Scan #", "Color", "Style", "Width", "Symbol"]
+        )
 
         header = self.tree.header()
         for idx in range(self.tree.columnCount()):
@@ -456,10 +551,10 @@ class CurveTree(BECWidget, QWidget):
                 header.setSectionResizeMode(idx, QHeaderView.Fixed)
         header.setStretchLastSection(False)
         self.tree.setColumnWidth(0, 90)
-        self.tree.setColumnWidth(3, 70)
-        self.tree.setColumnWidth(4, 80)
-        self.tree.setColumnWidth(5, 50)
+        self.tree.setColumnWidth(4, 70)
+        self.tree.setColumnWidth(5, 80)
         self.tree.setColumnWidth(6, 50)
+        self.tree.setColumnWidth(7, 50)
 
         self.layout.addWidget(self.tree)
 
@@ -583,9 +678,9 @@ class CurveTree(BECWidget, QWidget):
         self.tree.clear()
         self.all_items = []
 
-        device_curves = [c for c in self.waveform.curves if c.config.source == "device"]
+        top_curves = [c for c in self.waveform.curves if c.config.source in ("device", "history")]
         dap_curves = [c for c in self.waveform.curves if c.config.source == "dap"]
-        for dev in device_curves:
+        for dev in top_curves:
             dr = CurveRow(self.tree, parent_item=None, config=dev.config, device_manager=self.dev)
             for dap in dap_curves:
                 if dap.config.parent_label == dev.config.label:

bec_widgets/widgets/plots/waveform/waveform.py

@@ -8,6 +8,7 @@ import numpy as np
 import pyqtgraph as pg
 from bec_lib import bec_logger, messages
 from bec_lib.endpoints import MessageEndpoints
+from bec_lib.scan_data_container import ScanDataContainer
 from pydantic import Field, ValidationError, field_validator
 from qtpy.QtCore import Qt, QTimer, Signal
 from qtpy.QtWidgets import (
@@ -35,6 +36,9 @@ from bec_widgets.widgets.plots.plot_base import PlotBase
 from bec_widgets.widgets.plots.waveform.curve import Curve, CurveConfig, DeviceSignal
 from bec_widgets.widgets.plots.waveform.settings.curve_settings.curve_setting import CurveSetting
 from bec_widgets.widgets.plots.waveform.utils.roi_manager import WaveformROIManager
+from bec_widgets.widgets.services.scan_history_browser.scan_history_browser import (
+    ScanHistoryBrowser,
+)
 
 logger = bec_logger.logger
 
@@ -163,6 +167,7 @@ class Waveform(PlotBase):
         # Curve data
         self._sync_curves = []
         self._async_curves = []
+        self._history_curves = []
         self._slice_index = None
         self._dap_curves = []
         self._mode = None
@@ -179,12 +184,14 @@ class Waveform(PlotBase):
             "readout_priority": None,
             "label_suffix": "",
         }
+        self._current_x_device: tuple[str, str] | None = None
 
         # Specific GUI elements
         self._init_roi_manager()
         self.dap_summary = None
         self.dap_summary_dialog = None
-        self._add_fit_parameters_popup()
+        self.scan_history_dialog = None
+        self._add_waveform_specific_popup()
         self._enable_roi_toolbar_action(False)  # default state where are no dap curves
         self._init_curve_dialog()
         self.curve_settings_dialog = None
@@ -252,7 +259,7 @@ class Waveform(PlotBase):
         super().add_side_menus()
         self._add_dap_summary_side_menu()
 
-    def _add_fit_parameters_popup(self):
+    def _add_waveform_specific_popup(self):
         """
         Add popups to the Waveform widget.
         """
@@ -262,11 +269,24 @@ class Waveform(PlotBase):
                 icon_name="monitoring", tooltip="Open Fit Parameters", checkable=True, parent=self
             ),
         )
+        self.toolbar.components.add_safe(
+            "scan_history",
+            MaterialIconAction(
+                icon_name="manage_search",
+                tooltip="Open Scan History browser",
+                checkable=True,
+                parent=self,
+            ),
+        )
         self.toolbar.get_bundle("axis_popup").add_action("fit_params")
+        self.toolbar.get_bundle("axis_popup").add_action("scan_history")
 
         self.toolbar.components.get_action("fit_params").action.triggered.connect(
             self.show_dap_summary_popup
         )
+        self.toolbar.components.get_action("scan_history").action.triggered.connect(
+            self.show_scan_history_popup
+        )
 
     @SafeSlot()
     def _reset_view(self):
@@ -414,6 +434,47 @@ class Waveform(PlotBase):
             self.toolbar.components.get_action("roi_linear").action.setChecked(False)
             self._roi_manager.toggle_roi(False)
 
+    ################################################################################
+    # Scan History browser popup
+    # TODO this is so far quick implementation just as popup, we should make scan history also standalone widget later
+    def show_scan_history_popup(self):
+        """
+        Show the scan history popup.
+        """
+        scan_history_action = self.toolbar.components.get_action("scan_history").action
+        if self.scan_history_dialog is None or not self.scan_history_dialog.isVisible():
+            self.scan_history_widget = ScanHistoryBrowser(parent=self)
+            self.scan_history_dialog = QDialog(modal=False)
+            self.scan_history_dialog.setWindowTitle(f"{self.object_name} - Scan History Browser")
+            self.scan_history_dialog.layout = QVBoxLayout(self.scan_history_dialog)
+            self.scan_history_dialog.layout.addWidget(self.scan_history_widget)
+            self.scan_history_widget.scan_history_device_viewer.request_history_plot.connect(
+                lambda scan_id, device_name, signal_name: self.plot(
+                    y_name=device_name, y_entry=signal_name, scan_id=scan_id
+                )
+            )
+            self.scan_history_dialog.finished.connect(self._scan_history_closed)
+            self.scan_history_dialog.show()
+            self.scan_history_dialog.resize(780, 320)
+            scan_history_action.setChecked(True)
+        else:
+            # If already open, bring it to the front
+            self.scan_history_dialog.raise_()
+            self.scan_history_dialog.activateWindow()
+            scan_history_action.setChecked(True)  # keep it toggle
+
+    def _scan_history_closed(self):
+        """
+        Slot for when the scan history dialog is closed.
+        """
+        if self.scan_history_dialog is None:
+            return
+        self.scan_history_widget.close()
+        self.scan_history_widget.deleteLater()
+        self.scan_history_dialog.deleteLater()
+        self.scan_history_dialog = None
+        self.toolbar.components.get_action("scan_history").action.setChecked(False)
+
     ################################################################################
     # Dap Summary
 
@@ -503,7 +564,11 @@ class Waveform(PlotBase):
         self.x_axis_mode["name"] = value
         if value not in ["timestamp", "index", "auto"]:
             self.x_axis_mode["entry"] = self.entry_validator.validate_signal(value, None)
+            self._current_x_device = (value, self.x_axis_mode["entry"])
         self._switch_x_axis_item(mode=value)
+        self._current_x_device = None
+        self._refresh_history_curves()
+        self._update_curve_visibility()
         self.async_signal_update.emit()
         self.sync_signal_update.emit()
         self.plot_item.enableAutoRange(x=True)
@@ -531,6 +596,8 @@ class Waveform(PlotBase):
             return
         self.x_axis_mode["entry"] = self.entry_validator.validate_signal(self.x_mode, value)
         self._switch_x_axis_item(mode="device")
+        self._refresh_history_curves()
+        self._update_curve_visibility()
         self.async_signal_update.emit()
         self.sync_signal_update.emit()
         self.plot_item.enableAutoRange(x=True)
@@ -671,6 +738,8 @@ class Waveform(PlotBase):
         color: str | None = None,
         label: str | None = None,
         dap: str | None = None,
+        scan_id: str | None = None,
+        scan_number: int | None = None,
         **kwargs,
     ) -> Curve:
         """
@@ -693,6 +762,10 @@ class Waveform(PlotBase):
             dap(str): The dap model to use for the curve, only available for sync devices.
             If not specified, none will be added.
             Use the same string as is the name of the LMFit model.
+            scan_id(str):  Optional scan ID. When provided, the curve is treated as a **history** curve and
+                the y‑data (and optional x‑data) are fetched from that historical scan. Such curves are
+                never cleared by live‑scan resets.
+            scan_number(int): Optional scan index. When provided, the curve is treated as a **history** curve and
 
         Returns:
             Curve: The curve object.
@@ -762,6 +835,8 @@ class Waveform(PlotBase):
             label=label,
             color=color,
             source=source,
+            scan_id=scan_id,
+            scan_number=scan_number,
             **kwargs,
         )
 
@@ -769,6 +844,9 @@ class Waveform(PlotBase):
         if source == "device":
             config.signal = DeviceSignal(name=y_name, entry=y_entry)
 
+        if scan_id is not None or scan_number is not None:
+            config.source = "history"
+
         # CREATE THE CURVE
         curve = self._add_curve(config=config, x_data=x_data, y_data=y_data)
 
@@ -807,7 +885,7 @@ class Waveform(PlotBase):
         device_curve = self._find_curve_by_label(device_label)
         if not device_curve:
             raise ValueError(f"No existing curve found with label '{device_label}'.")
-        if device_curve.config.source != "device":
+        if device_curve.config.source not in ("device", "history"):
             raise ValueError(
                 f"Curve '{device_label}' is not a device curve. Only device curves can have DAP."
             )
@@ -816,7 +894,7 @@ class Waveform(PlotBase):
         dev_entry = device_curve.config.signal.entry
 
         # 2) Build a label for the new DAP curve
-        dap_label = f"{dev_name}-{dev_entry}-{dap_name}"
+        dap_label = f"{device_label}-{dap_name}"
 
         # 3) Possibly raise if the DAP curve already exists
         if self._check_curve_id(dap_label):
@@ -869,7 +947,23 @@ class Waveform(PlotBase):
             ValueError: If a duplicate curve label/config is found, or if
                         custom data is missing for `source='custom'`.
         """
+        scan_item: ScanDataContainer | None = None
+        if config.source == "history":
+            scan_item = self.get_history_scan_item(
+                scan_id=config.scan_id, scan_index=config.scan_number
+            )
+            if scan_item is None:
+                raise ValueError(
+                    f"Could not find scan item for history curve '{config.label}' with scan_id='{config.scan_id}' and scan_number='{config.scan_number}'."
+                )
+
+            config.scan_id = scan_item.metadata["bec"]["scan_id"]
+            config.scan_number = scan_item.metadata["bec"]["scan_number"]
+
         label = config.label
+        if config.source == "history":
+            label = f"{config.signal.name}-{config.signal.entry}-scan-{config.scan_number}"
+            config.label = label
         if not label:
             # Fallback label
             label = WidgetContainerUtils.generate_unique_name(
@@ -891,7 +985,7 @@ class Waveform(PlotBase):
                 raise ValueError("For 'custom' curves, x_data and y_data must be provided.")
 
         # Actually create the Curve item
-        curve = self._add_curve_object(name=label, config=config)
+        curve = self._add_curve_object(name=label, config=config, scan_item=scan_item)
 
         # If custom => set initial data
         if config.source == "custom" and x_data is not None and y_data is not None:
@@ -908,6 +1002,8 @@ class Waveform(PlotBase):
             self.setup_dap_for_scan()
             self.roi_enable.emit(True)  # Enable the ROI toolbar action
             self.request_dap()  # Request DAP update directly without blocking proxy
+        if config.source == "history":
+            self._history_curves.append(curve)
 
         QTimer.singleShot(
             150, self.auto_range
@@ -915,24 +1011,175 @@ class Waveform(PlotBase):
 
         return curve
 
-    def _add_curve_object(self, name: str, config: CurveConfig) -> Curve:
+    def _add_curve_object(
+        self, name: str, config: CurveConfig, scan_item: ScanDataContainer | None = None
+    ) -> Curve | None:
         """
         Low-level creation of the PlotDataItem (Curve) from a `CurveConfig`.
 
         Args:
             name (str): The name/label of the curve.
             config (CurveConfig): Configuration model describing the curve.
+            scan_item (ScanDataContainer | None): Optional scan item for history curves.
 
         Returns:
             Curve: The newly created curve object, added to the plot.
         """
         curve = Curve(config=config, name=name, parent_item=self)
         self.plot_item.addItem(curve)
+        if scan_item is not None:
+            self._fetch_history_data_for_curve(curve, scan_item)
         self._categorise_device_curves()
         curve.visibleChanged.connect(self._refresh_crosshair_markers)
         curve.visibleChanged.connect(self.auto_range)
         return curve
 
+    def _fetch_history_data_for_curve(
+        self, curve: Curve, scan_item: ScanDataContainer
+    ) -> Curve | None:
+        # Check if the data are already set
+        device = curve.config.signal.name
+        entry = curve.config.signal.entry
+
+        all_devices_used = getattr(
+            getattr(scan_item, "_msg", None), "stored_data_info", None
+        ) or getattr(scan_item, "stored_data_info", None)
+        if all_devices_used is None:
+            curve.remove()
+            raise ValueError(
+                f"No stored data info found in scan item ID:{curve.config.scan_id} for curve '{curve.name()}'. "
+                f"Upgrade BEC to the latest version."
+            )
+
+        # 1. get y data
+        x_data, y_data = None, None
+        if device not in all_devices_used:
+            raise ValueError(f"Device '{device}' not found in scan item ID:{curve.config.scan_id}.")
+        if entry not in all_devices_used[device]:
+            raise ValueError(
+                f"Entry '{entry}' not found in device '{device}' in scan item ID:{curve.config.scan_id}."
+            )
+        y_shape = all_devices_used.get(device).get(entry).shape[0]
+
+        # Determine X-axis data
+        if self.x_axis_mode["name"] == "index":
+            x_data = np.arange(y_shape)
+            curve.config.current_x_mode = "index"
+            self._update_x_label_suffix(" (index)")
+        elif self.x_axis_mode["name"] == "timestamp":
+            y_device = scan_item.devices.get(device)
+            x_data = y_device.get(entry).read().get("timestamp")
+            curve.config.current_x_mode = "timestamp"
+            self._update_x_label_suffix(" (timestamp)")
+        elif self.x_axis_mode["name"] not in ("index", "timestamp", "auto"):  # Custom device mode
+            if self.x_axis_mode["name"] not in all_devices_used:
+                logger.warning(
+                    f"Custom device '{self.x_axis_mode['name']}' not found in scan item of history curve '{curve.name()}'; scan ID: {curve.config.scan_id}."
+                )
+                curve.setVisible(False)
+                return
+            x_entry_custom = self.x_axis_mode.get("entry")
+            if x_entry_custom is None:
+                x_entry_custom = self.entry_validator.validate_signal(
+                    self.x_axis_mode["name"], None
+                )
+            if x_entry_custom not in all_devices_used[self.x_axis_mode["name"]]:
+                logger.warning(
+                    f"Custom entry '{x_entry_custom}' for device '{self.x_axis_mode['name']}' not found in scan item of history curve '{curve.name()}'; scan ID: {curve.config.scan_id}."
+                )
+                curve.setVisible(False)
+                return
+            x_shape = (
+                scan_item._msg.stored_data_info.get(self.x_axis_mode["name"])
+                .get(x_entry_custom)
+                .shape[0]
+            )
+            if x_shape != y_shape:
+                logger.warning(
+                    f"Shape mismatch for x data '{x_shape}' and y data '{y_shape}' in history curve '{curve.name()}'; scan ID: {curve.config.scan_id}."
+                )
+                curve.setVisible(False)
+                return
+            x_device = scan_item.devices.get(self.x_axis_mode["name"])
+            x_data = x_device.get(x_entry_custom).read().get("value")
+            curve.config.current_x_mode = self.x_axis_mode["name"]
+            self._update_x_label_suffix(f" (custom: {self.x_axis_mode['name']}-{x_entry_custom})")
+        elif self.x_axis_mode["name"] == "auto":
+            if (
+                self._current_x_device is None
+            ):  # Scenario where no x device is set yet, because there was no live scan done in this widget yet
+                # If no current x device, use the first motor from scan item
+                scan_motors = self._ensure_str_list(
+                    scan_item.metadata.get("bec").get("scan_report_devices")
+                )
+                if not scan_motors:  # scan was done without reported motor from whatever reason
+                    x_data = np.arange(y_shape)  # Fallback to index
+                    y_data = scan_item.devices.get(device).get(entry).read().get("value")
+                    curve.set_data(x=x_data, y=y_data)
+                    self._update_x_label_suffix(" (auto: index)")
+                    return curve
+                x_entry = self.entry_validator.validate_signal(scan_motors[0], None)
+                if x_entry not in all_devices_used.get(scan_motors[0], {}):
+                    logger.warning(
+                        f"Auto x entry '{x_entry}' for device '{scan_motors[0]}' not found in scan item of history curve '{curve.name()}'; scan ID: {curve.config.scan_id}."
+                    )
+                    curve.setVisible(False)
+                    return
+                if y_shape != all_devices_used.get(scan_motors[0]).get(x_entry, {}).shape[0]:
+                    logger.warning(
+                        f"Shape mismatch for x data '{all_devices_used.get(scan_motors[0]).get(x_entry, {}).get('shape', [0])[0]}' and y data '{y_shape}' in history curve '{curve.name()}'; scan ID: {curve.config.scan_id}."
+                    )
+                    curve.setVisible(False)
+                    return
+                x_data = scan_item.devices.get(scan_motors[0]).get(x_entry).read().get("value")
+                self._current_x_device = (scan_motors[0], x_entry)
+                self._update_x_label_suffix(f" (auto: {scan_motors[0]}-{x_entry})")
+                curve.config.current_x_mode = "auto"
+                self._update_x_label_suffix(f" (auto: {scan_motors[0]}-{x_entry})")
+            else:  # Scan in auto mode was done and live scan already set the current x device
+                if self._current_x_device[0] not in all_devices_used:
+                    logger.warning(
+                        f"Auto x data for device '{self._current_x_device[0]}' "
+                        f"and entry '{self._current_x_device[1]}'"
+                        f" not found in scan item of the history curve {curve.name()}."
+                    )
+                    curve.setVisible(False)
+                    return
+                x_device = scan_item.devices.get(self._current_x_device[0])
+                x_data = x_device.get(self._current_x_device[1]).read().get("value")
+                curve.config.current_x_mode = "auto"
+                self._update_x_label_suffix(
+                    f" (auto: {self._current_x_device[0]}-{self._current_x_device[1]})"
+                )
+        if x_data is None:
+            logger.warning(
+                f"X data for curve '{curve.name()}' could not be determined. "
+                f"Check if the x_mode '{self.x_axis_mode['name']}' is valid for the scan item."
+            )
+            curve.setVisible(False)
+            return
+        if y_data is None:
+            y_data = scan_item.devices.get(device).get(entry).read().get("value")
+            if y_data is None:
+                logger.warning(
+                    f"Y data for curve '{curve.name()}' could not be determined. "
+                    f"Check if the device '{device}' and entry '{entry}' are valid for the scan item."
+                )
+                curve.setVisible(False)
+                return
+        curve.set_data(x=x_data, y=y_data)
+        return curve
+
+    def _refresh_history_curves(self):
+        for curve in self._history_curves:
+            scan_item = self.get_history_scan_item(
+                scan_id=curve.config.scan_id, scan_index=curve.config.scan_number
+            )
+            if scan_item is not None:
+                self._fetch_history_data_for_curve(curve, scan_item)
+            else:
+                logger.warning(f"Scan item for curve {curve.name()} not found.")
+
     def _refresh_crosshair_markers(self):
         """
         Refresh the crosshair markers when a curve visibility changes.
@@ -967,7 +1214,42 @@ class Waveform(PlotBase):
         Clear all data from the plot widget, but keep the curve references.
         """
         for c in self.curves:
-            c.clear_data()
+            if c.config.source != "history":
+                c.clear_data()
+
+    # X-axis compatibility helpers
+    def _is_curve_compatible(self, curve: Curve) -> bool:
+        """
+        Return True when *curve* can be shown with the current x-axis mode.
+
+        - ‘index’, ‘timestamp’ are always compatible.
+        - For history curves we check whether the requested motor
+          (self.x_axis_mode["name"]) exists in the cached
+          history_data_buffer["x"] dictionary.
+        - DAP is done by checking if the parent curve is visible.
+        - Device curves are fetched by update sync/async curves, which solves the compatibility there.
+        """
+        mode = self.x_axis_mode.get("name", "index")
+        if mode in ("index", "timestamp"):  # always compatible - wild west mode
+            return True
+        if curve.config.source == "history":
+            scan_item = self.get_history_scan_item(
+                scan_id=curve.config.scan_id, scan_index=curve.config.scan_number
+            )
+            curve = self._fetch_history_data_for_curve(curve, scan_item)
+            if curve is None:
+                return False
+        if curve.config.source == "dap":
+            parent_curve = self._find_curve_by_label(curve.config.parent_label)
+            if parent_curve.isVisible():
+                return True
+            return False  # DAP curve is not compatible if parent curve is not visible
+        return True
+
+    def _update_curve_visibility(self) -> None:
+        """Show or hide curves according to `_is_curve_compatible`."""
+        for c in self.curves:
+            c.setVisible(self._is_curve_compatible(c))
 
     def clear_all(self):
         """
@@ -1130,7 +1412,7 @@ class Waveform(PlotBase):
             self.scan_id = current_scan_id
             self.scan_item = self.queue.scan_storage.find_scan_by_ID(self.scan_id)  # live scan
             self._slice_index = None  # Reset the slice index
-
+            self._update_curve_visibility()
             self._mode = self._categorise_device_curves()
 
             # First trigger to sync and async data
@@ -1208,7 +1490,7 @@ class Waveform(PlotBase):
                 device_data = entry_obj.read()["value"] if entry_obj else None
             x_data = self._get_x_data(device_name, device_entry)
             if x_data is not None:
-                if len(x_data) == 1:
+                if np.isscalar(x_data):
                     self.clear_data()
                     return
             if device_data is not None and x_data is not None:
@@ -1616,6 +1898,7 @@ class Waveform(PlotBase):
                 entry_obj = data.get(x_name, {}).get(x_entry)
                 x_data = entry_obj.read()["value"] if entry_obj else [0]
             new_suffix = f" (custom: {x_name}-{x_entry})"
+            self._current_x_device = (x_name, x_entry)
 
         # 2 User wants timestamp
         if self.x_axis_mode["name"] == "timestamp":
@@ -1630,11 +1913,13 @@ class Waveform(PlotBase):
                 timestamps = entry_obj.read()["timestamp"] if entry_obj else [0]
             x_data = timestamps
             new_suffix = " (timestamp)"
+            self._current_x_device = None
 
         # 3 User wants index
         if self.x_axis_mode["name"] == "index":
             x_data = None
             new_suffix = " (index)"
+            self._current_x_device = None
 
         # 4 Best effort automatic mode
         if self.x_axis_mode["name"] is None or self.x_axis_mode["name"] == "auto":
@@ -1642,6 +1927,7 @@ class Waveform(PlotBase):
             if len(self._async_curves) > 0:
                 x_data = None
                 new_suffix = " (auto: index)"
+                self._current_x_device = None
             # 4.2 If there are sync curves, use the first device from the scan report
             else:
                 try:
@@ -1664,6 +1950,7 @@ class Waveform(PlotBase):
                         entry_obj = data.get(x_name, {}).get(x_entry)
                         x_data = entry_obj.read()["value"] if entry_obj else None
                     new_suffix = f" (auto: {x_name}-{x_entry})"
+                self._current_x_device = (x_name, x_entry)
         self._update_x_label_suffix(new_suffix)
         return x_data
 
@@ -1766,49 +2053,83 @@ class Waveform(PlotBase):
         logger.info(f"Scan {self.scan_id} => mode={self._mode}")
         return mode
 
-    @SafeSlot(int)
-    @SafeSlot(str)
-    @SafeSlot()
-    def update_with_scan_history(self, scan_index: int = None, scan_id: str = None):
+    def get_history_scan_item(
+        self, scan_index: int = None, scan_id: str = None
+    ) -> ScanDataContainer | None:
         """
-        Update the scan curves with the data from the scan storage.
-        Provide only one of scan_id or scan_index.
+        Get scan item from history based on scan_id or scan_index.
+        If both are provided, scan_id takes precedence and the resolved scan_number
+        will be read from the fetched item.
 
         Args:
-            scan_id(str, optional): ScanID of the scan to be updated. Defaults to None.
-            scan_index(int, optional): Index of the scan to be updated. Defaults to None.
+            scan_id (str, optional): ScanID of the scan to fetch. Defaults to None.
+            scan_index (int, optional): Index (scan number) of the scan to fetch. Defaults to None.
+
+        Returns:
+            ScanDataContainer | None: The fetched scan item or None if no item was found.
         """
         if scan_index is not None and scan_id is not None:
-            raise ValueError("Only one of scan_id or scan_index can be provided.")
+            scan_index = None  # Prefer scan_id when both are given
 
         if scan_index is None and scan_id is None:
-            logger.warning(f"Neither scan_id or scan_number was provided, fetching the latest scan")
+            logger.warning("Neither scan_id or scan_number was provided, fetching the latest scan")
             scan_index = -1
 
         if scan_index is None:
-            self.scan_id = scan_id
-            self.scan_item = self.client.history.get_by_scan_id(scan_id)
-            self._emit_signal_update()
-            return
+            return self.client.history.get_by_scan_id(scan_id)
 
         if scan_index == -1:
             scan_item = self.client.queue.scan_storage.current_scan
             if scan_item is not None:
                 if scan_item.status_message is None:
                     logger.warning(f"Scan item with {scan_item.scan_id} has no status message.")
-                    return
-                self.scan_item = scan_item
-                self.scan_id = scan_item.scan_id
-                self._emit_signal_update()
-                return
+                    return None
+                return scan_item
 
         if len(self.client.history) == 0:
-            logger.info("No scans executed so far. Skipping scan history update.")
+            logger.info("No scans executed so far. Cannot fetch scan history.")
+            return None
+
+        # check if scan_index is negative, then fetch it just from the list from the end
+        if int(scan_index) < 0:
+            return self.client.history[scan_index]
+        scan_item = self.client.history.get_by_scan_number(scan_index)
+        if scan_item is None:
+            logger.warning(f"Scan with scan_number {scan_index} not found in history.")
+            return None
+        if isinstance(scan_item, list):
+            if len(scan_item) > 1:
+                logger.warning(
+                    f"Multiple scans found with scan_number {scan_index}. Returning the latest one."
+                )
+            scan_item = scan_item[-1]
+        return scan_item
+
+    @SafeSlot(int)
+    @SafeSlot(str)
+    @SafeSlot()
+    def update_with_scan_history(self, scan_index: int = None, scan_id: str = None):
+        """
+        Update the scan curves with the data from the scan storage.
+        If both arguments are provided, scan_id takes precedence and scan_index is ignored.
+
+        Args:
+            scan_id(str, optional): ScanID of the scan to be updated. Defaults to None.
+            scan_index(int, optional): Index (scan number) of the scan to be updated. Defaults to None.
+        """
+        self.scan_item = self.get_history_scan_item(scan_index=scan_index, scan_id=scan_id)
+
+        if self.scan_item is None:
             return
 
-        self.scan_item = self.client.history[scan_index]
-        metadata = self.scan_item.metadata
-        self.scan_id = metadata["bec"]["scan_id"]
+        if scan_id is not None:
+            self.scan_id = scan_id
+        else:
+            # If scan_number was used, set the scan_id from the fetched item
+            if hasattr(self.scan_item, "metadata"):
+                self.scan_id = self.scan_item.metadata["bec"]["scan_id"]
+            else:
+                self.scan_id = self.scan_item.scan_id
 
         self._emit_signal_update()
 
@@ -2039,6 +2360,9 @@ class Waveform(PlotBase):
         if self.dap_summary_dialog is not None:
             self.dap_summary_dialog.reject()
             self.dap_summary_dialog = None
+        if self.scan_history_dialog is not None:
+            self.scan_history_dialog.reject()
+            self.scan_history_dialog = None
         super().cleanup()
 
 

bec_widgets/widgets/services/device_browser/device_browser.py

@@ -125,10 +125,8 @@ class DeviceBrowser(BECWidget, QWidget):
             action (str): The action that triggered the event.
             content (dict): The content of the config update.
         """
-        if action in ["add", "remove", "reload"]:
-            self.devices_changed.emit()
-        if action in ["update", "reload"]:
-            self.device_update.emit(action, content)
+        self.devices_changed.emit()
+        self.device_update.emit(action, content)
 
     def init_device_list(self):
         self.dev_list.clear()

bec_widgets/widgets/services/device_browser/device_item/device_item.py

@@ -10,8 +10,17 @@ from bec_lib.messages import ConfigAction
 from bec_qthemes import material_icon
 from qtpy.QtCore import QMimeData, QSize, Qt, QThreadPool, Signal
 from qtpy.QtGui import QDrag
-from qtpy.QtWidgets import QApplication, QHBoxLayout, QTabWidget, QToolButton, QVBoxLayout, QWidget
+from qtpy.QtWidgets import (
+    QApplication,
+    QHBoxLayout,
+    QLabel,
+    QTabWidget,
+    QToolButton,
+    QVBoxLayout,
+    QWidget,
+)
 
+from bec_widgets.utils.compact_popup import LedLabel
 from bec_widgets.utils.error_popups import SafeSlot
 from bec_widgets.utils.expandable_frame import ExpandableGroupFrame
 from bec_widgets.widgets.services.device_browser.device_item.config_communicator import (
@@ -56,6 +65,10 @@ class DeviceItem(ExpandableGroupFrame):
         self._expanded_first_time = False
         self._data = None
         self.device = device
+        self._deleting = False
+
+        self._ro_pixmap = material_icon(icon_name="keyboard_off", size=(15, 15))
+        self._we_pixmap = material_icon(icon_name="keyboard", size=(15, 15))
 
         self._layout = QHBoxLayout()
         self._layout.setContentsMargins(0, 0, 0, 0)
@@ -78,6 +91,7 @@ class DeviceItem(ExpandableGroupFrame):
 
         self.set_layout(self._layout)
         self.adjustSize()
+        self._reload_config()
 
     def _create_title_layout(self, title: str, icon: str):
         super()._create_title_layout(title, icon)
@@ -92,6 +106,11 @@ class DeviceItem(ExpandableGroupFrame):
         self._title_layout.insertWidget(self._title_layout.count() - 1, self.delete_button)
         self.delete_button.clicked.connect(self._delete_device)
 
+        self.enabled_led = LedLabel()
+        self._title_layout.insertWidget(1, self.enabled_led)
+        self.readonly_label = QLabel()
+        self._title_layout.insertWidget(2, self.readonly_label)
+
     @SafeSlot()
     def _create_edit_dialog(self):
         dialog = DeviceConfigDialog(
@@ -106,6 +125,7 @@ class DeviceItem(ExpandableGroupFrame):
 
     @SafeSlot()
     def _delete_device(self):
+        self._deleting = True
         self.expanded = False
         deleter = CommunicateConfigAction(self._config_helper, self.device, None, "remove")
         deleter.signals.error.connect(self._deletion_error)
@@ -147,17 +167,23 @@ class DeviceItem(ExpandableGroupFrame):
 
     @SafeSlot(str, dict)
     def config_update(self, action: ConfigAction, content: dict) -> None:
-        if self.device in content:
+        if (self.device in content or action == "reload") and not self._deleting:
             self._reload_config()
 
     @SafeSlot(popup_error=True)
     def _reload_config(self, *_):
-        self.set_display_config(self.dev[self.device]._config)
+        # Guard in case we attempt to reload config while a device is being removed/readded
+        if (dev := self.dev.get(self.device)) is not None:
+            self.set_display_config(dev._config)
 
     def set_display_config(self, config_dict: dict):
         """Set the displayed information from a device config dict, which must conform to the
         bec_lib.atlas_models.Device config model."""
         self._data = DeviceConfigModel.model_validate(config_dict)
+        self.enabled_led.setState("success" if self._data.enabled else "emergency")
+        self.enabled_led.setToolTip("enabled" if self._data.enabled else "disabled")
+        self.readonly_label.setPixmap(self._ro_pixmap if self._data.readOnly else self._we_pixmap)
+        self.readonly_label.setToolTip("read only" if self._data.readOnly else "writing enabled")
         if self._expanded_first_time:
             self.form.set_data(self._data)
 

bec_widgets/widgets/services/device_browser/device_item/device_signal_display.py

@@ -38,8 +38,8 @@ class SignalDisplay(BECWidget, QWidget):
     @SafeSlot()
     def _refresh(self):
         if (dev := self.dev.get(self.device)) is not None:
-            dev.read()
-            dev.read_configuration()
+            dev.read(cached=True)
+            dev.read_configuration(cached=True)
 
     def _add_refresh_button(self):
         button_holder = QWidget()

bec_widgets/widgets/utility/signal_label/signal_label.py

@@ -273,7 +273,9 @@ class SignalLabel(BECWidget, QWidget):
         if not isinstance(self._device_obj, Device | Signal):
             self._value, self._units = "__", ""
             return
-        reading = (self._device_obj.read() or {}) | (self._device_obj.read_configuration() or {})
+        reading = (self._device_obj.read(cached=True) or {}) | (
+            self._device_obj.read_configuration(cached=True) or {}
+        )
         value = reading.get(self._signal_key, {}).get("value")
         if value is None:
             self._value, self._units = "__", ""

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "bec_widgets"
-version = "2.38.4"
+version = "2.41.1"
 description = "BEC Widgets"
 requires-python = ">=3.11"
 classifiers = [
@@ -13,8 +13,8 @@ classifiers = [
     "Topic :: Scientific/Engineering",
 ]
 dependencies = [
-    "bec_ipython_client~=3.52", # needed for jupyter console
-    "bec_lib~=3.52",
+    "bec_ipython_client~=3.70",  # needed for jupyter console
+    "bec_lib~=3.70",
     "bec_qthemes~=0.7, >=0.7",
     "black~=25.0",              # needed for bw-generate-cli
     "isort~=5.13, >=5.13.2",    # needed for bw-generate-cli

tests/end-2-end/test_plotting_framework_e2e.py

@@ -286,3 +286,85 @@ def test_waveform_passing_device(qtbot, bec_client_lib, connected_client_gui_obj
     # check plotted data
     x_data, y_data = c1.get_data()
     assert np.array_equal(y_data, last_scan_data.devices.samx.samx_setpoint.read().get("value"))
+
+
+@pytest.mark.timeout(120)
+@pytest.mark.parametrize(
+    "history_selector", ["scan_id", "scan_number"]
+)  # ensure unique curves per run
+def test_rpc_waveform_history_curve(
+    qtbot, bec_client_lib, connected_client_gui_obj, history_selector
+):
+    """
+    E2E test for the new history curve feature:
+    - Run 3 scans
+    - For each scan, fetch history curve data using either scan_id OR scan_number (parametrized)
+    - Compare waveform data with BEC client scan data
+    Note: Parameterization prevents adding the same logical curve twice (which would collide on label).
+    """
+    gui = connected_client_gui_obj
+    dock = gui.bec
+    client = bec_client_lib
+    dev = client.device_manager.devices
+    scans = client.scans
+    queue = client.queue
+
+    wf = dock.new("wf_dock").new("Waveform")
+
+    # Collect references for validation
+    scan_meta = []  # list of dicts with scan_id, scan_number, data
+
+    # Run 3 scans and collect their metadata and data
+    for i in range(3):
+        status = scans.line_scan(dev.samx, -5 + i, 5 + i, steps=10, exp_time=0.01, relative=False)
+        status.wait()
+
+        # Wait until the history entry appears and corresponds to this scan
+        def _wait_for_scan_in_history():
+            if len(client.history) == 0:
+                return False
+            return client.history[-1].metadata.bec.get("scan_id", None) == status.scan.scan_id
+
+        qtbot.waitUntil(_wait_for_scan_in_history, timeout=10000)
+
+        hist_item = client.history[-1]
+        item = queue.scan_storage.storage[-1]
+        data = item.live_data if hasattr(item, "live_data") else item.data
+        scan_meta.append(
+            {
+                "scan_id": hist_item.metadata.bec.get("scan_id"),
+                "scan_number": hist_item.metadata.bec.get("scan_number"),
+                "data": data,
+            }
+        )
+
+    # For each scan, fetch history curve by the chosen selector and compare to client data
+    for meta in scan_meta:
+        sel_value = meta[history_selector]
+        scan_data = meta["data"]
+
+        # Add curve from history using the chosen selector; single curve per scan to avoid duplicates
+        kwargs = {history_selector: sel_value}
+        curve = wf.plot(x_name="samx", y_name="bpm4i", **kwargs)
+
+        num_elements = 10
+
+        # Wait until curve has the expected number of points
+        def _curve_ready():
+            try:
+                x, y = curve.get_data()
+            except Exception:
+                return False
+            return x is not None and len(x) == num_elements and len(y) == num_elements
+
+        qtbot.waitUntil(_curve_ready, timeout=10000)
+
+        # Get plotted data
+        x_vals, y_vals = curve.get_data()
+
+        # Compare against BEC client scan data
+        np.testing.assert_equal(x_vals, np.array(scan_data["samx"]["samx"].val))
+        np.testing.assert_equal(y_vals, np.array(scan_data["bpm4i"]["bpm4i"].val))
+
+        # Clean up
+        curve.remove()

tests/unit_tests/client_mocks.py

@@ -7,6 +7,7 @@ import pytest
 from bec_lib.bec_service import messages
 from bec_lib.endpoints import MessageEndpoints
 from bec_lib.redis_connector import RedisConnector
+from bec_lib.scan_history import ScanHistory
 
 from bec_widgets.tests.utils import DEVICES, DMMock, FakePositioner, Positioner
 
@@ -238,3 +239,18 @@ def create_dummy_scan_item():
         "scan_report_devices": ["samx"],
     }
     return dummy_scan
+
+
+def inject_scan_history(widget, scan_history_factory, *history_args):
+    """
+    Helper to inject scan history messages into client history.
+    """
+    history_msgs = []
+    for scan_id, scan_number in history_args:
+        history_msgs.append(scan_history_factory(scan_id=scan_id, scan_number=scan_number))
+    widget.client.history = ScanHistory(widget.client, False)
+    for msg in history_msgs:
+        widget.client.history._scan_data[msg.scan_id] = msg
+        widget.client.history._scan_ids.append(msg.scan_id)
+    widget.client.queue.scan_storage.current_scan = None
+    return history_msgs

tests/unit_tests/conftest.py

@@ -5,8 +5,9 @@ import h5py
 import numpy as np
 import pytest
 from bec_lib import messages
+from bec_lib.messages import _StoredDataInfo
 from pytestqt.exceptions import TimeoutError as QtBotTimeoutError
-from qtpy.QtWidgets import QApplication
+from qtpy.QtWidgets import QApplication, QMessageBox
 
 from bec_widgets.cli.rpc.rpc_register import RPCRegister
 from bec_widgets.utils import bec_dispatcher as bec_dispatcher_module
@@ -69,6 +70,14 @@ def clean_singleton():
     error_popups._popup_utility_instance = None
 
 
+@pytest.fixture(autouse=True)
+def suppress_message_box(monkeypatch):
+    """
+    Auto-suppress any QMessageBox.exec_ calls by returning Ok immediately.
+    """
+    monkeypatch.setattr(QMessageBox, "exec_", lambda *args, **kwargs: QMessageBox.Ok)
+
+
 def create_widget(qtbot, widget, *args, **kwargs):
     """
     Create a widget and add it to the qtbot for testing. This is a helper function that
@@ -115,9 +124,25 @@ def create_history_file(file_path, data: dict, metadata: dict) -> messages.ScanH
                     elif isinstance(sub_value, dict):
                         for sub_sub_key, sub_sub_value in sub_value.items():
                             sub_sub_group = metadata_bec[key].create_group(sub_key)
+                            # Handle _StoredDataInfo objects
+                            if isinstance(sub_sub_value, _StoredDataInfo):
+                                # Store the numeric shape
+                                sub_sub_group.create_dataset("shape", data=sub_sub_value.shape)
+                                # Store the dtype as a UTF-8 string
+                                dt = sub_sub_value.dtype or ""
+                                sub_sub_group.create_dataset(
+                                    "dtype", data=dt, dtype=h5py.string_dtype(encoding="utf-8")
+                                )
+                                continue
                             if isinstance(sub_sub_value, list):
-                                sub_sub_value = json.dumps(sub_sub_value)
-                            sub_sub_group.create_dataset(sub_sub_key, data=sub_sub_value)
+                                json_val = json.dumps(sub_sub_value)
+                                sub_sub_group.create_dataset(sub_sub_key, data=json_val)
+                            elif isinstance(sub_sub_value, dict):
+                                for k2, v2 in sub_sub_value.items():
+                                    val = json.dumps(v2) if isinstance(v2, list) else v2
+                                    sub_sub_group.create_dataset(k2, data=val)
+                            else:
+                                sub_sub_group.create_dataset(sub_sub_key, data=sub_sub_value)
                     else:
                         metadata_bec[key].create_dataset(sub_key, data=sub_value)
             else:
@@ -144,6 +169,8 @@ def create_history_file(file_path, data: dict, metadata: dict) -> messages.ScanH
         end_time=time.time(),
         num_points=metadata["num_points"],
         request_inputs=metadata["request_inputs"],
+        stored_data_info=metadata.get("stored_data_info"),
+        metadata={"scan_report_devices": metadata.get("scan_report_devices")},
     )
     return msg
 
@@ -194,3 +221,102 @@ def grid_scan_history_msg(tmpdir):
 
     file_path = str(tmpdir.join("scan_1.h5"))
     return create_history_file(file_path, data, metadata)
+
+
+@pytest.fixture
+def scan_history_factory(tmpdir):
+    """
+    Factory to create scan history messages with custom parameters.
+    Usage:
+        msg1 = scan_history_factory(scan_id="id1", scan_number=1, num_points=10)
+        msg2 = scan_history_factory(scan_id="id2", scan_number=2, scan_name="grid_scan", num_points=16)
+    """
+
+    def _factory(
+        scan_id: str = "test_scan",
+        scan_number: int = 1,
+        dataset_number: int = 1,
+        scan_name: str = "line_scan",
+        scan_type: str = "step",
+        num_points: int = 10,
+        x_range: tuple = (-5, 5),
+        y_range: tuple = (-5, 5),
+    ):
+        # Generate positions based on scan type
+        if scan_name == "grid_scan":
+            grid_size = int(np.sqrt(num_points))
+            x_grid, y_grid = np.meshgrid(
+                np.linspace(x_range[0], x_range[1], grid_size),
+                np.linspace(y_range[0], y_range[1], grid_size),
+            )
+            x_flat = x_grid.T.ravel()
+            y_flat = y_grid.T.ravel()
+        else:
+            x_flat = np.linspace(x_range[0], x_range[1], num_points)
+            y_flat = np.linspace(y_range[0], y_range[1], num_points)
+        positions = np.vstack((x_flat, y_flat)).T
+        num_pts = len(positions)
+        # Create dummy data
+        data = {
+            "baseline": {"bpm1a": {"bpm1a": {"value": [1], "timestamp": [100]}}},
+            "monitored": {
+                "bpm4i": {
+                    "bpm4i": {
+                        "value": np.random.rand(num_points),
+                        "timestamp": np.random.rand(num_points),
+                    }
+                },
+                "bpm3a": {
+                    "bpm3a": {
+                        "value": np.random.rand(num_points),
+                        "timestamp": np.random.rand(num_points),
+                    }
+                },
+                "samx": {"samx": {"value": x_flat, "timestamp": np.arange(num_pts)}},
+                "samy": {"samy": {"value": y_flat, "timestamp": np.arange(num_pts)}},
+            },
+            "async": {
+                "async_device": {
+                    "async_device": {
+                        "value": np.random.rand(num_pts * 10),
+                        "timestamp": np.random.rand(num_pts * 10),
+                    }
+                }
+            },
+        }
+        metadata = {
+            "scan_id": scan_id,
+            "scan_name": scan_name,
+            "scan_type": scan_type,
+            "exit_status": "closed",
+            "scan_number": scan_number,
+            "dataset_number": dataset_number,
+            "request_inputs": {
+                "arg_bundle": [
+                    "samx",
+                    x_range[0],
+                    x_range[1],
+                    num_pts,
+                    "samy",
+                    y_range[0],
+                    y_range[1],
+                    num_pts,
+                ],
+                "kwargs": {"relative": True},
+            },
+            "positions": positions.tolist(),
+            "num_points": num_pts,
+            "stored_data_info": {
+                "samx": {"samx": _StoredDataInfo(shape=(num_points,), dtype="float64")},
+                "samy": {"samy": _StoredDataInfo(shape=(num_points,), dtype="float64")},
+                "bpm4i": {"bpm4i": _StoredDataInfo(shape=(10,), dtype="float64")},
+                "async_device": {
+                    "async_device": _StoredDataInfo(shape=(num_points * 10,), dtype="float64")
+                },
+            },
+            "scan_report_devices": [b"samx"],
+        }
+        file_path = str(tmpdir.join(f"{scan_id}.h5"))
+        return create_history_file(file_path, data, metadata)
+
+    return _factory

tests/unit_tests/test_curve_settings.py

@@ -2,10 +2,15 @@ import json
 from unittest.mock import MagicMock, patch
 
 import pytest
+from bec_lib.scan_history import ScanHistory
+from qtpy.QtGui import QValidator
 from qtpy.QtWidgets import QComboBox, QVBoxLayout
 
 from bec_widgets.widgets.plots.waveform.settings.curve_settings.curve_setting import CurveSetting
-from bec_widgets.widgets.plots.waveform.settings.curve_settings.curve_tree import CurveTree
+from bec_widgets.widgets.plots.waveform.settings.curve_settings.curve_tree import (
+    CurveTree,
+    ScanIndexValidator,
+)
 from bec_widgets.widgets.plots.waveform.waveform import Waveform
 from tests.unit_tests.client_mocks import dap_plugin_message, mocked_client, mocked_client_with_dap
 from tests.unit_tests.conftest import create_widget
@@ -155,7 +160,7 @@ def test_curve_tree_init(curve_tree_fixture):
     curve_tree, wf = curve_tree_fixture
     assert curve_tree.waveform == wf
     assert curve_tree.color_palette == "plasma"
-    assert curve_tree.tree.columnCount() == 7
+    assert curve_tree.tree.columnCount() == 8
 
     assert curve_tree.toolbar.components.exists("add")
     assert curve_tree.toolbar.components.exists("expand")
@@ -374,3 +379,54 @@ def test_export_data_dap(curve_tree_fixture):
     assert exported["signal"]["entry"] == "bpm4i"
     assert exported["signal"]["dap"] == "GaussianModel"
     assert exported["label"] == "bpm4i-bpm4i-GaussianModel"
+
+
+def test_scan_index_validator_behavior():
+    """
+    Test ScanIndexValidator allows empty, 'live', partial 'live', valid scan numbers,
+    and rejects invalid or disallowed inputs under the new allowed-set API.
+    """
+    validator = ScanIndexValidator(allowed_scans={1, 2, 3})
+
+    def state(txt):
+        s, _, _ = validator.validate(txt, 0)
+        return s
+
+    assert state("") == QValidator.State.Acceptable
+    assert state("live") == QValidator.State.Acceptable
+    assert state("l") == QValidator.State.Intermediate
+    assert state("liv") == QValidator.State.Intermediate
+    assert state("1") == QValidator.State.Acceptable
+    assert state("3") == QValidator.State.Acceptable
+    assert state("4") == QValidator.State.Invalid
+    assert state("0") == QValidator.State.Invalid
+    assert state("abc") == QValidator.State.Invalid
+
+
+def test_export_data_history_curve(curve_tree_fixture, scan_history_factory):
+    """
+    Test that export_data for a history curve row correctly serializes scan_number
+    and resets scan_id when a numeric scan is selected.
+    """
+    curve_tree, wf = curve_tree_fixture
+    # Inject two history scans into the waveform client
+    msgs = [
+        scan_history_factory(scan_id="hid1", scan_number=1),
+        scan_history_factory(scan_id="hid2", scan_number=2),
+    ]
+    wf.client.history = ScanHistory(wf.client, False)
+    for m in msgs:
+        wf.client.history._scan_data[m.scan_id] = m
+        wf.client.history._scan_ids.append(m.scan_id)
+        wf.client.history._scan_numbers.append(m.scan_number)
+    wf.client.queue.scan_storage.current_scan = None
+
+    # Create a device row and select scan index "2"
+    device_row = curve_tree.add_new_curve(name="bpm4i", entry="bpm4i")
+    device_row.scan_index_combo.setCurrentText("2")
+
+    exported = device_row.export_data()
+    assert exported["source"] == "history"
+    assert exported["scan_number"] == 2
+    assert exported["scan_id"] is None
+    assert exported["label"] == "bpm4i-bpm4i-scan-2"

tests/unit_tests/test_device_config_form_dialog.py

@@ -137,6 +137,7 @@ def test_update_cycle(update_dialog, qtbot):
                 "description": None,
                 "readOnly": False,
                 "softwareTrigger": False,
+                "onFailure": "retry",
                 "deviceTags": set(),
                 "userParameter": {},
                 "name": "test_device",

tests/unit_tests/test_image_roi_tree.py

@@ -29,6 +29,14 @@ def roi_tree(qtbot, image_widget):
     yield tree
 
 
+@pytest.fixture
+def compact_roi_tree(qtbot, image_widget):
+    tree = create_widget(
+        qtbot, ROIPropertyTree, image_widget=image_widget, compact=True, compact_color="#00BCD4"
+    )
+    yield tree
+
+
 def test_initialization(roi_tree, image_widget):
     """Test that the widget initializes correctly with the right components."""
     # Check the widget has the right structure
@@ -431,3 +439,120 @@ def test_cleanup_disconnect_signals(roi_tree, image_widget):
     # Verify that the tree item was not updated
     assert item.text(roi_tree.COL_ROI) == initial_name
     assert item.child(2).text(roi_tree.COL_PROPS) == initial_coord
+
+
+def test_compact_initialization_minimal_toolbar(compact_roi_tree):
+    assert compact_roi_tree.compact is True
+    assert compact_roi_tree.tree is None
+
+    # Draw actions exist
+    assert compact_roi_tree.toolbar.components.get_action("roi_rectangle")
+    assert compact_roi_tree.toolbar.components.get_action("roi_circle")
+    assert compact_roi_tree.toolbar.components.get_action("roi_ellipse")
+
+    # Full-mode actions are absent
+    import pytest
+
+    with pytest.raises(KeyError):
+        compact_roi_tree.toolbar.components.get_action("expand_toggle")
+    with pytest.raises(KeyError):
+        compact_roi_tree.toolbar.components.get_action("lock_unlock_all")
+    with pytest.raises(KeyError):
+        compact_roi_tree.toolbar.components.get_action("roi_tree_cmap")
+
+    assert not hasattr(compact_roi_tree, "lock_all_action")
+
+
+def test_compact_single_roi_enforced_programmatic(compact_roi_tree, image_widget):
+    # Add first ROI
+    roi1 = image_widget.add_roi(kind="rect", name="r1")
+    assert len(image_widget.roi_controller.rois) == 1
+    assert roi1.line_color == "#00BCD4"
+
+    # Add second ROI; the first should be removed automatically
+    roi2 = image_widget.add_roi(kind="circle", name="c1")
+    rois = image_widget.roi_controller.rois
+    assert len(rois) == 1
+    assert rois[0] is roi2
+
+    from bec_widgets.widgets.plots.roi.image_roi import CircularROI
+
+    assert isinstance(rois[0], CircularROI)
+    assert rois[0].line_color == "#00BCD4"
+
+
+def test_compact_add_roi_from_toolbar_single_enforced(qtbot, compact_roi_tree, image_widget):
+    # Ensure view is ready
+    plot_item = image_widget.plot_item
+    view = plot_item.vb.scene().views()[0]
+    qtbot.waitExposed(view)
+
+    # Activate rectangle drawing
+    rect_action = compact_roi_tree.toolbar.components.get_action("roi_rectangle").action
+    rect_action.setChecked(True)
+
+    # Draw rectangle
+    start_pos = QPointF(10, 10)
+    end_pos = QPointF(50, 40)
+    start_scene = plot_item.vb.mapViewToScene(start_pos)
+    end_scene = plot_item.vb.mapViewToScene(end_pos)
+    start_widget = view.mapFromScene(start_scene)
+    end_widget = view.mapFromScene(end_scene)
+    qtbot.mousePress(view.viewport(), Qt.LeftButton, pos=start_widget)
+    qtbot.mouseMove(view.viewport(), pos=end_widget)
+    qtbot.mouseRelease(view.viewport(), Qt.LeftButton, pos=end_widget)
+    qtbot.wait(100)
+
+    rois = image_widget.roi_controller.rois
+    from bec_widgets.widgets.plots.roi.image_roi import CircularROI, RectangularROI
+
+    assert len(rois) == 1
+    assert isinstance(rois[0], RectangularROI)
+    assert rois[0].line_color == "#00BCD4"
+
+    # Now draw a circle; rectangle should be removed automatically
+    rect_action.setChecked(False)
+    circle_action = compact_roi_tree.toolbar.components.get_action("roi_circle").action
+    circle_action.setChecked(True)
+
+    start_pos = QPointF(20, 20)
+    end_pos = QPointF(40, 40)
+    start_scene = plot_item.vb.mapViewToScene(start_pos)
+    end_scene = plot_item.vb.mapViewToScene(end_pos)
+    start_widget = view.mapFromScene(start_scene)
+    end_widget = view.mapFromScene(end_scene)
+    qtbot.mousePress(view.viewport(), Qt.LeftButton, pos=start_widget)
+    qtbot.mouseMove(view.viewport(), pos=end_widget)
+    qtbot.mouseRelease(view.viewport(), Qt.LeftButton, pos=end_widget)
+    qtbot.wait(100)
+
+    rois = image_widget.roi_controller.rois
+    assert len(rois) == 1
+    assert isinstance(rois[0], CircularROI)
+    assert rois[0].line_color == "#00BCD4"
+
+
+def test_compact_draw_mode_toggle(compact_roi_tree):
+    # Initially no draw mode
+    assert compact_roi_tree._roi_draw_mode is None
+
+    rect_action = compact_roi_tree.toolbar.components.get_action("roi_rectangle").action
+    circle_action = compact_roi_tree.toolbar.components.get_action("roi_circle").action
+
+    # Toggle rect on
+    rect_action.toggle()
+    assert compact_roi_tree._roi_draw_mode == "rect"
+    assert rect_action.isChecked()
+    assert not circle_action.isChecked()
+
+    # Toggle circle on; rect should toggle off
+    circle_action.toggle()
+    assert compact_roi_tree._roi_draw_mode == "circle"
+    assert circle_action.isChecked()
+    assert not rect_action.isChecked()
+
+    # Toggle circle off → none
+    circle_action.toggle()
+    assert compact_roi_tree._roi_draw_mode is None
+    assert not rect_action.isChecked()
+    assert not circle_action.isChecked()

tests/unit_tests/test_positioner_box.py

@@ -50,7 +50,7 @@ def positioner_box(qtbot, mocked_client):
 def test_positioner_box(positioner_box):
     """Test init of positioner box"""
     assert positioner_box.device == "samx"
-    data = positioner_box.dev["samx"].read()
+    data = positioner_box.dev["samx"].read(cached=True)
     # Avoid check for Positioner class from BEC in _init_device
 
     setpoint_text = positioner_box.ui.setpoint.text()

tests/unit_tests/test_positioner_box_2d.py

@@ -29,8 +29,8 @@ def test_positioner_box_2d(positioner_box_2d):
     """Test init of 2D positioner box"""
     assert positioner_box_2d.device_hor == "samx"
     assert positioner_box_2d.device_ver == "samy"
-    data_hor = positioner_box_2d.dev["samx"].read()
-    data_ver = positioner_box_2d.dev["samy"].read()
+    data_hor = positioner_box_2d.dev["samx"].read(cached=True)
+    data_ver = positioner_box_2d.dev["samy"].read(cached=True)
     # Avoid check for Positioner class from BEC in _init_device
 
     setpoint_hor_text = positioner_box_2d.ui.setpoint_hor.text()

tests/unit_tests/test_serializer.py

@@ -21,7 +21,6 @@ def test_multiple_extension_registration():
     """
     Test that multiple extension registrations do not cause issues.
     """
-    assert serialization.module_is_registered("bec_widgets.utils.serialization")
+    assert msgpack.is_registered(QPointF)
     serialization.register_serializer_extension()
-    assert serialization.module_is_registered("bec_widgets.utils.serialization")
-    assert len(msgpack._encoder) == len(set(msgpack._encoder))
+    assert msgpack.is_registered(QPointF)

tests/unit_tests/test_waveform.py

@@ -10,22 +10,19 @@ import pyqtgraph as pg
 import pytest
 from pyqtgraph.graphicsItems.DateAxisItem import DateAxisItem
 from qtpy.QtCore import QTimer
-from qtpy.QtWidgets import (
-    QApplication,
-    QCheckBox,
-    QDialog,
-    QDialogButtonBox,
-    QDoubleSpinBox,
-    QSpinBox,
-)
+from qtpy.QtWidgets import QApplication, QCheckBox, QDialog, QDialogButtonBox, QDoubleSpinBox
 
 from bec_widgets.widgets.plots.plot_base import UIMode
 from bec_widgets.widgets.plots.waveform.curve import DeviceSignal
 from bec_widgets.widgets.plots.waveform.waveform import Waveform
+from bec_widgets.widgets.services.scan_history_browser.scan_history_browser import (
+    ScanHistoryBrowser,
+)
 from tests.unit_tests.client_mocks import (
     DummyData,
     create_dummy_scan_item,
     dap_plugin_message,
+    inject_scan_history,
     mocked_client,
     mocked_client_with_dap,
 )
@@ -841,6 +838,33 @@ def test_show_dap_summary_popup(qtbot, mocked_client):
     assert fit_action.isChecked() is False
 
 
+def test_show_scan_history_popup(qtbot, mocked_client):
+    """
+    Test that show_scan_history_popup displays the scan history browser dialog
+    and toggles the toolbar action correctly.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    scan_action = wf.toolbar.components.get_action("scan_history").action
+    # Initially unchecked and no dialog
+    assert not scan_action.isChecked()
+    assert wf.scan_history_dialog is None
+
+    # Show the popup
+    wf.show_scan_history_popup()
+    # Dialog should exist and be visible, action checked
+    assert wf.scan_history_dialog is not None
+    assert wf.scan_history_dialog.isVisible()
+    assert scan_action.isChecked()
+    # The embedded widget should be the correct type
+    assert isinstance(wf.scan_history_widget, ScanHistoryBrowser)
+
+    # Close the dialog (triggers _scan_history_closed)
+    wf.scan_history_dialog.close()
+    # Dialog reference should be cleared and action unchecked
+    assert wf.scan_history_dialog is None
+    assert not scan_action.isChecked()
+
+
 #####################################################
 # The following tests are for the async dataset guard
 #####################################################
@@ -1063,3 +1087,187 @@ def test_dialog_reject_real_interaction(qtbot, mocked_client):
     assert wf.skip_large_dataset_warning is True
     # Limit remains unchanged
     assert wf.max_dataset_size_mb == 1
+
+
+def test_update_with_scan_history_by_index(qtbot, mocked_client, scan_history_factory):
+    """
+    Test that update_with_scan_history by index loads the correct historical scan.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    hist1, hist2 = inject_scan_history(wf, scan_history_factory, ("hist1", 1), ("hist2", 2))
+
+    assert len(wf.client.history._scan_ids) == 2, "Expected two history scans"
+
+    # Do history curve plotting
+    wf.plot(y_name="bpm4i", y_entry="bpm4i", scan_id="hist1")
+    wf.plot(y_name="bpm4i", scan_number=2)
+
+    assert len(wf.plot_item.curves) == 2, "Expected two curves for history scans"
+    c1, c2 = wf.plot_item.curves
+    # First curve should be for hist1, second for hist2
+    assert c1.config.signal.name == "bpm4i"
+    assert c1.config.signal.entry == "bpm4i"
+    assert c1.config.scan_id == "hist1"
+    assert c1.config.scan_number == 1
+    assert c1.name() == "bpm4i-bpm4i-scan-1"
+
+    assert c2.config.signal.name == "bpm4i"
+    assert c2.config.signal.entry == "bpm4i"
+    assert c2.config.scan_id == "hist2"
+    assert c2.config.scan_number == 2
+    assert c2.name() == "bpm4i-bpm4i-scan-2"
+
+
+@pytest.mark.parametrize("mode", ["auto", "timestamp", "index", "samx"])
+def test_history_curve_x_modes_pre_plot(qtbot, mocked_client, scan_history_factory, mode):
+    """
+    Test that history curves respect x_mode when set before plotting.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    hist1, hist2 = inject_scan_history(wf, scan_history_factory, ("hist1", 1), ("hist2", 2))
+    wf.x_mode = mode
+    c = wf.plot(y_name="bpm4i", y_entry="bpm4i", scan_id="hist1")
+    assert c.config.current_x_mode == mode
+
+
+@pytest.mark.parametrize("mode", ["auto", "timestamp", "index", "samx"])
+def test_history_curve_x_modes_post_plot(qtbot, mocked_client, scan_history_factory, mode):
+    """
+    Test that changing x_mode after plotting history curves updates the curve on refresh.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    hist1, hist2 = inject_scan_history(wf, scan_history_factory, ("hist1", 1), ("hist2", 2))
+    c = wf.plot(y_name="bpm4i", y_entry="bpm4i", scan_id="hist1")
+    # Change x_mode after plotting
+    wf.x_mode = mode
+    # Refresh history curves
+    wf._refresh_history_curves()
+    assert c.config.current_x_mode == mode
+
+
+def test_history_curve_incompatible_x_mode_hides_curve(qtbot, mocked_client, scan_history_factory):
+    """
+    Test that setting an x_mode not present in stored data hides the history curve.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    wf.x_mode = "nonexistent_device"
+    # Inject history scan for this test
+    [history_msg] = inject_scan_history(wf, scan_history_factory, ("hist_bad", 1))
+    # Plot history curve
+    c = wf.plot(y_name="bpm4i", y_entry="bpm4i", scan_id=history_msg.scan_id)
+    # Curve should be hidden due to incompatible x_mode
+    assert not c.isVisible()
+
+
+def test_fetch_history_data_no_stored_data_raises(
+    qtbot, mocked_client, monkeypatch, suppress_message_box
+):
+    """
+    Test that fetching history data when stored_data_info is missing raises ValueError.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    # Create a dummy scan_item lacking stored_data_info
+    dummy_scan = SimpleNamespace(
+        _msg=SimpleNamespace(stored_data_info=None),
+        devices={},
+        metadata={"bec": {"scan_id": "dummy", "scan_number": 1, "scan_report_devices": []}},
+    )
+    # Force get_history_scan_item to return our dummy
+    monkeypatch.setattr(wf, "get_history_scan_item", lambda scan_id, scan_index: dummy_scan)
+    # Attempt to plot history curve should be suppressed by SafeSlot and return None
+    c = wf.plot(y_name="bpm4i", y_entry="bpm4i", scan_id="dummy", scan_number=1)
+    assert c is None
+    assert len(wf.curves) == 0
+
+
+def test_history_curve_device_missing_returns_none(qtbot, mocked_client, scan_history_factory):
+    """
+    If the y-device is not in stored_data_info, plot should return None.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    wf.x_mode = "index"
+    [history_msg] = inject_scan_history(wf, scan_history_factory, ("hist_dev_missing", 1))
+    c = wf.plot(y_name="non-existing", y_entry="non-existing", scan_id=history_msg.scan_id)
+    assert c is None
+
+
+def test_history_curve_custom_shape_mismatch_hides_curve(
+    qtbot, mocked_client, scan_history_factory
+):
+    """
+    For custom x-mode, if x and y shapes mismatch, curve should be hidden.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    wf.x_mode = "async_device"
+    [history_msg] = inject_scan_history(wf, scan_history_factory, ("hist_custom_shape", 1))
+    # Force shape mismatch for x-data
+    c = wf.plot(y_name="bpm4i", y_entry="bpm4i", scan_id=history_msg.scan_id)
+    assert c is not None
+    assert not c.isVisible()
+
+
+def test_history_curve_index_mode_plots_curve(qtbot, mocked_client, scan_history_factory):
+    """
+    Test that setting x_mode to 'index' plots and shows the history curve correctly.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    wf.x_mode = "index"
+    [history_msg] = inject_scan_history(wf, scan_history_factory, ("hist_index", 1))
+    c = wf.plot(y_name="bpm4i", y_entry="bpm4i", scan_id=history_msg.scan_id)
+    assert c is not None
+    assert c.isVisible()
+    assert c.config.current_x_mode == "index"
+
+
+def test_history_curve_timestamp_mode_plots_curve(qtbot, mocked_client, scan_history_factory):
+    """
+    Test that setting x_mode to 'timestamp' plots and shows the history curve correctly.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    wf.x_mode = "timestamp"
+    [history_msg] = inject_scan_history(wf, scan_history_factory, ("hist_time", 1))
+    c = wf.plot(y_name="bpm4i", y_entry="bpm4i", scan_id=history_msg.scan_id)
+    assert c is not None
+    assert c.isVisible()
+    assert c.config.current_x_mode == "timestamp"
+
+
+def test_history_curve_auto_valid_uses_first_report_device(
+    qtbot, mocked_client, scan_history_factory
+):
+    """
+    Test that 'auto' x_mode uses the first available report device and shows the curve.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    wf.x_mode = "auto"
+    [history_msg] = inject_scan_history(wf, scan_history_factory, ("hist_auto_valid", 1))
+    # Plot history curve
+    c = wf.plot(y_name="bpm4i", y_entry="bpm4i", scan_id=history_msg.scan_id)
+    assert c is not None
+    assert c.isVisible()
+    # Should have fallen back to the first scan_report_device
+    assert c.config.current_x_mode == "auto"
+
+
+def test_history_curve_file_not_found_returns_none(qtbot, mocked_client, scan_history_factory):
+    """
+    If the history file path does not exist, plot should return None.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    wf.x_mode = "index"
+    # Inject a valid history message then corrupt its file_path
+    [history_msg] = inject_scan_history(wf, scan_history_factory, ("bad_file", 1))
+    history_msg.file_path = "/nonexistent/path.h5"
+    c = wf.plot(y_name="bpm4i", y_entry="bpm4i", scan_id=history_msg.scan_id)
+    assert c is None
+
+
+def test_history_curve_scan_not_found_returns_none(qtbot, mocked_client):
+    """
+    If the requested scan_id is not in history, plot should return None.
+    """
+    wf = create_widget(qtbot, Waveform, client=mocked_client)
+    wf.x_mode = "index"
+    # No history scans injected for this widget
+    c = wf.plot(y_name="bpm4i", y_entry="bpm4i", scan_id="unknown_scan")
+    assert c is None