feat(charting): unify configurable time windows

backend/tests/test_widgets.py

@@ -1224,6 +1224,21 @@ async def test_qbittorrent_speed_reads_samples_without_polling(tmp_path):
     assert dl_points[-1]["v"] == 500000
 
 
+@pytest.mark.asyncio
+async def test_qbittorrent_speed_all_values_reads_all_retained_samples():
+    """The all-values speed setting intentionally omits the time cutoff."""
+    from media_library_viewer_api.widgets.sources import QbittorrentWidgetSource
+
+    adapter = QbittorrentWidgetSource()
+    service = ServiceRecord(id="svc-speed", service_type="qbittorrent", name="qbit", config={}, secrets={})
+    with patch("media_library_viewer_api.widgets.sources.QbittorrentSampleStore") as store_cls:
+        store_cls.return_value.window.return_value = [{"ts": 10, "dl_speed": 20, "up_speed": 30}]
+        result = await adapter.fetch(service, "speed", {"window_seconds": "all"})
+
+    store_cls.return_value.window.assert_called_once_with("svc-speed")
+    assert result["series"][0]["points"] == [{"t": 10_000, "v": 20}]
+
+
 @pytest.mark.asyncio
 async def test_qbittorrent_adapter_missing_service():
     from media_library_viewer_api.widgets.sources import QbittorrentWidgetSource