fix(qbittorrent): preserve torrent metadata in incremental updates

backend/src/media_library_viewer_api/clients/qbittorrent.py

@@ -220,7 +220,12 @@ class QbittorrentClient:
                 if fields is None:
                     snap["torrents"].pop(hash_, None)
                 else:
-                    snap["torrents"][hash_] = fields
+                    previous = snap["torrents"].get(hash_)
+                    snap["torrents"][hash_] = (
+                        {**previous, **fields}
+                        if isinstance(previous, dict) and isinstance(fields, dict)
+                        else fields
+                    )
         for hash_ in update.get("torrents_removed") or []:
             snap["torrents"].pop(hash_, None)
         categories = update.get("categories")

backend/tests/test_qbittorrent_client.py

@@ -125,13 +125,21 @@ class QbittorrentClientTests(unittest.TestCase):
             "rid": 10,
             "full_update": True,
             "server_state": {"dl_info_speed": 100},
-            "torrents": {"a": {"name": "A", "state": "downloading"}},
+            "torrents": {
+                "a": {
+                    "name": "A",
+                    "state": "downloading",
+                    "size": 1_024,
+                    "progress": 0.5,
+                    "dlspeed": 100,
+                }
+            },
         }
         partial = {
             "rid": 11,
             "full_update": False,
             "server_state": {"dl_info_speed": 200},
-            "torrents": {"a": {"name": "A", "state": "pausedDL"}},
+            "torrents": {"a": {"dlspeed": 200}},
         }
         self.session.get.side_effect = [self._get_response(full), self._get_response(partial)]
 
@@ -143,7 +151,11 @@ class QbittorrentClientTests(unittest.TestCase):
         r2 = self.client.maindata()
         self.assertEqual(self.session.get.call_args_list[1].kwargs["params"].get("rid"), 10)
         self.assertEqual(r2["server_state"]["dl_info_speed"], 200)  # merged
-        self.assertEqual(r2["torrents"]["a"]["state"], "pausedDL")  # merged
+        self.assertEqual(r2["torrents"]["a"]["dlspeed"], 200)
+        self.assertEqual(r2["torrents"]["a"]["name"], "A")
+        self.assertEqual(r2["torrents"]["a"]["state"], "downloading")
+        self.assertEqual(r2["torrents"]["a"]["size"], 1_024)
+        self.assertEqual(r2["torrents"]["a"]["progress"], 0.5)
 
     def test_maindata_caches_concurrent_calls_within_ttl(self) -> None:
         """Two calls within the TTL collapse to a single HTTP fetch."""
@@ -227,8 +239,8 @@ class QbittorrentClientTests(unittest.TestCase):
         self.session.post.return_value = self._login_response()
         self.client._login()
         call_kwargs = self.session.post.call_args.kwargs
-        assert call_kwargs["timeout"] == (5.0, 5.0)
+        self.assertEqual(call_kwargs["timeout"], (5.0, 5.0))
-        assert not isinstance(call_kwargs["timeout"], int)
+        self.assertNotIsInstance(call_kwargs["timeout"], int)
 
     def test_login_fails_message_names_bad_credentials(self) -> None:
         """'Fails.' body yields a clear 'invalid username or password' error."""

docs/REQUIREMENTS.md

@@ -46,7 +46,7 @@ fully removed (web-ui-rework; see decision log 2026-06-17).
 
 ### Tables
 
-- All in-app time-series widgets should use the shared range-aware `LineSeriesChart` component so range controls, filtering, and display formatting remain consistent across Prometheus and qBittorrent charts. The selector offers 5 minutes, 15 minutes, 30 minutes, 1 hour, 3 hours, 6 hours, 12 hours, 24 hours, 2 days, 7 days, 14 days, 30 days, and **All values**; sources with bounded local retention expose the finite windows they can retain plus all retained values.
+- All in-app time-series widgets should use the shared range-aware `LineSeriesChart` component so filtering and display formatting remain consistent across Prometheus and qBittorrent charts. A dashboard widget's configured window is its single source of range selection and the card renders the complete configured response; the standalone qBittorrent service-history page retains an interactive selector with **All values** for all retained samples.
 
 - Tabular surfaces use **TanStack Table** (`@tanstack/react-table`) behind a `DataTable`
   wrapper (`components/ui/data-table.tsx`).
@@ -321,6 +321,9 @@ These do not reference a service.
 - The scheduler should run immediately after startup with per-service staggering, use fixed-delay execution, prevent overlap/backlog, and reconcile configuration changes without a backend restart.
 - Poll failures should remain enabled, be persisted, and retry with bounded exponential backoff. A successful scheduled or manual run should clear backoff.
 - The qBittorrent widget-data endpoint must become read-only; only the scheduler may contact qBittorrent and append samples.
+- The qBittorrent client must merge incremental torrent patches with the prior
+  snapshot so active-transfer rows retain their name, size, progress, and state
+  when only throughput changes.
 - The service UI should expose polling settings, current status, stale-data state, a manual `Run now` action, the shared selectable chart windows, an **All values** option that fetches every retained speed sample, and paginated scheduled-action history.
 - Scheduled-action runs should use dedicated generic records, retain at most 30 days or 1,000 runs per service/action, and never store secrets or raw credentials.
 - Disabling a qBittorrent service pauses polling while retaining history; deleting the service purges its samples and scheduler history through the existing cascade-delete behavior.

frontend/src/components/LineSeriesChart.tsx

@@ -76,6 +76,8 @@ interface LineSeriesChartProps {
 	scale?: MetricScale;
 	/** Available displayed time ranges. Defaults to the shared range choices. */
 	rangeOptions?: readonly ChartRangeOption[];
+	/** Whether to render the interactive range selector. */
+	showRangeSelector?: boolean;
 	/** Initial uncontrolled range. Defaults to the largest numeric option. */
 	defaultRangeSeconds?: ChartRangeValue;
 	/** Controlled range for consumers that refetch when the selection changes. */
@@ -90,6 +92,7 @@ export function LineSeriesChart({
 	unit = "none",
 	scale = "auto",
 	rangeOptions = DEFAULT_CHART_RANGES,
+	showRangeSelector = true,
 	defaultRangeSeconds,
 	rangeSeconds,
 	onRangeChange,
@@ -98,8 +101,9 @@ export function LineSeriesChart({
 		defaultRangeSeconds ??
 		[...rangeOptions].reverse().find((range) => typeof range.value === "number")
 			?.value;
-	const [localRangeSeconds, setLocalRangeSeconds] =
+	const [localRangeSeconds, setLocalRangeSeconds] = useState<
-		useState<ChartRangeValue | undefined>(initialRange);
+		ChartRangeValue | undefined
+	>(initialRange);
 	const selectedRangeSeconds = rangeSeconds ?? localRangeSeconds;
 	const latestTimestamp = series.reduce(
 		(max, seriesItem) =>
@@ -140,7 +144,7 @@ export function LineSeriesChart({
 
 	return (
 		<div className="space-y-2">
-			{rangeOptions.length > 0 && (
+			{showRangeSelector && rangeOptions.length > 0 && (
 				<div className="flex justify-end">
 					<Select
 						value={

frontend/src/components/__tests__/LineSeriesChart.test.tsx

@@ -38,6 +38,13 @@ describe("LineSeriesChart", () => {
 		).toHaveTextContent("2 hours");
 	});
 
+	it("can hide the interactive selector for configured widgets", () => {
+		render(<LineSeriesChart series={[]} showRangeSelector={false} />);
+		expect(
+			screen.queryByRole("combobox", { name: "Chart range" }),
+		).not.toBeInTheDocument();
+	});
+
 	it("offers all loaded values and reports that selection", () => {
 		const onRangeChange = vi.fn();
 		render(

frontend/src/widgets/MetricChartWidget.tsx

@@ -1,10 +1,6 @@
 import { Alert, AlertDescription } from "@/components/ui/alert";
 import { Skeleton } from "@/components/ui/skeleton";
 import { LineSeriesChart } from "../components/LineSeriesChart";
-import {
-	chartRangesThrough,
-	rangeSecondsFromWindow,
-} from "../components/chartRanges";
 import type { ChartSeries } from "../components/LineSeriesChart";
 import type { MetricScale, MetricUnit } from "../lib/metricFormat";
 import { SectionCard } from "../components/SectionCard";
@@ -24,7 +20,6 @@ export function MetricChartWidget({
 }: Props) {
 	const { data, isLoading } = useWidgetData(widget.id, refreshIntervalMs);
 	const series = data?.data?.series as ChartSeries[] | undefined;
-	const maxRangeSeconds = rangeSecondsFromWindow(widget.config.window);
 
 	return (
 		<SectionCard title={widget.title} description={description}>
@@ -39,8 +34,7 @@ export function MetricChartWidget({
 					series={series}
 					unit={widget.config.unit as MetricUnit}
 					scale={widget.config.scale as MetricScale}
-					rangeOptions={chartRangesThrough(maxRangeSeconds)}
+					showRangeSelector={false}
-					defaultRangeSeconds={maxRangeSeconds}
 				/>
 			) : (
 				<Alert>

frontend/src/widgets/QbittorrentSpeedWidget.tsx

@@ -1,10 +1,6 @@
 import { Alert, AlertDescription } from "@/components/ui/alert";
 import { Skeleton } from "@/components/ui/skeleton";
 import { LineSeriesChart } from "../components/LineSeriesChart";
-import {
-	chartRangesThrough,
-	type ChartRangeValue,
-} from "../components/chartRanges";
 import type { ChartSeries } from "../components/LineSeriesChart";
 import type { MetricScale, MetricUnit } from "../lib/metricFormat";
 import { SectionCard } from "../components/SectionCard";
@@ -27,11 +23,6 @@ export function QbittorrentSpeedWidget({
 	// Source returns raw bytes/sec; default to bytes/sec + auto scale (MB/s, …).
 	const unit = (widget.config.unit as MetricUnit) || "bytes_per_sec";
 	const scale = (widget.config.scale as MetricScale) || "auto";
-	const configuredRange = widget.config.window_seconds;
-	const maxRangeSeconds =
-		configuredRange === "all" ? 86_400 : Number(configuredRange) || 1800;
-	const defaultRangeSeconds: ChartRangeValue =
-		configuredRange === "all" ? "all" : maxRangeSeconds;
 
 	return (
 		<SectionCard title={widget.title} description={description}>
@@ -47,8 +38,7 @@ export function QbittorrentSpeedWidget({
 					unit={unit}
 					scale={scale}
 					height={220}
-					rangeOptions={chartRangesThrough(maxRangeSeconds)}
+					showRangeSelector={false}
-					defaultRangeSeconds={defaultRangeSeconds}
 				/>
 			) : (
 				<Alert>

frontend/src/widgets/__tests__/MetricChartWidget.test.tsx

@@ -56,6 +56,9 @@ describe("MetricChartWidget", () => {
 		render(<MetricChartWidget widget={widget} refreshIntervalMs={60000} />);
 		// recharts renders an SVG; the title from SectionCard should be present.
 		expect(screen.getByText("CPU Usage")).toBeInTheDocument();
+		expect(
+			screen.queryByRole("combobox", { name: "Chart range" }),
+		).not.toBeInTheDocument();
 	});
 
 	it("shows error Alert on error", () => {

frontend/src/widgets/__tests__/QbittorrentSpeedWidget.test.tsx

@@ -52,6 +52,9 @@ describe("QbittorrentSpeedWidget", () => {
 			<QbittorrentSpeedWidget widget={widget} refreshIntervalMs={5000} />,
 		);
 		expect(screen.getByText("Speed Chart")).toBeInTheDocument();
+		expect(
+			screen.queryByRole("combobox", { name: "Chart range" }),
+		).not.toBeInTheDocument();
 		expect(container.firstChild).not.toBeNull();
 	});