diff --git a/src/App.tsx b/src/App.tsx
index 6b750dc4..82424da1 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -313,7 +313,7 @@ function AppInner() {
     // master/detail layout and renders on any tab — same path NodeDetailPanel's onAnalyzePacket uses
     Traces: <TraceList onAnalyze={hash => { if (hash) viewPacket(hash); }} onViewNode={viewNode} />,
     Channels: <ChannelList wsManager={wsManager} onAnalyze={handleAnalyze} />,
-    Analytics: <StatsOverview wsManager={wsManager} onViewNode={viewNode} />,
+    Analytics: <StatsOverview onViewNode={viewNode} />,
     Map: <MapView wsManager={wsManager} selectedNodeId={selectedNodeId} onSelectNode={setSelectedNodeId} />,
   };
 
diff --git a/src/api/client.ts b/src/api/client.ts
index 1b47bfff..fcea6a51 100644
--- a/src/api/client.ts
+++ b/src/api/client.ts
@@ -5,7 +5,7 @@ import type { ChannelPage, ChannelMessage } from "../features/channels/types";
 import type { ObserverSummary, Observer, AdvertObservation } from "../features/observers/types";
 import type { NodeSummary, Node, NodeObservation, NodeNeighbor } from "../features/nodes/types";
 import type {
-  StatsOverview,
+  StatsSeries,
   SignalStats,
   PathStats,
   ObserverComparison,
@@ -71,11 +71,11 @@ async function request<T>(path: string, params?: Record<string, string | number
 // endpoint functions
 
 export function getObserverComparison(
-  iatas: string[] | undefined,
+  iatas: StatsRegion,
   params: { observerA: string; observerB: string; since: number; until: number },
   signal?: AbortSignal,
 ): Promise<ObserverComparison> {
-  return request("/stats/observer-comparison", { ...params, iatas: iatasParam(iatas) }, signal);
+  return request("/stats/observer-comparison", { ...params, ...statsRegionParams(iatas) }, signal);
 }
 
 // The region filter travels as the comma-separated `iatas` param; undefined/empty means all regions.
@@ -83,10 +83,22 @@ function iatasParam(iatas?: string[]): string | undefined {
   return iatas && iatas.length > 0 ? iatas.join(",") : undefined;
 }
 
+// An empty list is a region with no IATAs. These endpoints would answer it with every IATA, so skip them.
+const noIatas = (iatas?: string[]) => iatas?.length === 0;
+const emptyPage = <T>(): CursorPage<T> => ({ items: [], nextCursor: null, hasMore: false });
+
+// Stats endpoints also take a region slug, which the server answers with zeros when it has no IATAs.
+export type StatsRegion = string[] | { region: string } | undefined;
+
+function statsRegionParams(r: StatsRegion): { iatas?: string; region?: string } {
+  return Array.isArray(r) || r === undefined ? { iatas: iatasParam(r) } : { region: r.region };
+}
+
 export function getPackets(
   iatas: string[] | undefined,
   params?: { cursor?: number; limit?: number; payloadTypes?: number[]; routeTypes?: number[]; scopes?: string[] },
 ): Promise<CursorPage<PacketSummary>> {
+  if (noIatas(iatas)) return Promise.resolve(emptyPage());
   return request("/packets", {
     iatas: iatasParam(iatas),
     cursor: params?.cursor,
@@ -127,6 +139,7 @@ export function getRegion(regionId: number): Promise<Region> {
 
 // Preserve the server cursor rather than deriving it from the displayed channel order.
 export function getChannels(params?: { iatas?: string[]; limit?: number; cursor?: number | string; keyKnown?: boolean }): Promise<ChannelPage> {
+  if (noIatas(params?.iatas)) return Promise.resolve(emptyPage());
   const iatas = params?.iatas ?? [];
   return request("/channels", {
     iata: iatas.length === 1 ? iatas[0] : undefined,
@@ -145,6 +158,7 @@ export async function getChannelMessagesPage(
   channelId: number,
   params?: { iatas?: string[]; cursor?: number; limit?: number; scope?: string },
 ): Promise<CursorPage<ChannelMessage>> {
+  if (noIatas(params?.iatas)) return emptyPage();
   const limit = params?.limit ?? DEFAULT_PAGE_SIZE;
   const page = await request<{ items: ChannelMessage[]; nextCursor?: number | null; hasMore?: boolean }>(`/channels/${channelId}/messages`, {
     iatas: iatasParam(params?.iatas),
@@ -163,6 +177,7 @@ export function getBrokers(): Promise<BrokerStatus[]> {
 // Transport scope names (e.g. "#bc", "#west") for the scope filter dropdowns. With IATAs the server
 // returns only that region's scopes (manual config + its MeshMapper catalogue); bare, every stored name.
 export function getScopes(iatas?: string[]): Promise<string[]> {
+  if (noIatas(iatas)) return Promise.resolve([]);
   return request("/scopes", { iatas: iatasParam(iatas) });
 }
 
@@ -217,6 +232,7 @@ export function getTraces(
   iatas: string[] | undefined,
   params?: { scope?: string; type?: TraceType; since?: number; until?: number; cursor?: number; limit?: number },
 ): Promise<TraceTagSummary[]> {
+  if (noIatas(iatas)) return Promise.resolve([]);
   return request("/traces", {
     iatas: iatasParam(iatas),
     scope: params?.scope,
@@ -268,6 +284,7 @@ export function getNodesPage(
     neighbors?: boolean; // include each node's neighborIds (?neighbors=true)
   },
 ): Promise<CursorPage<NodeSummary>> {
+  if (noIatas(iatas)) return Promise.resolve(emptyPage());
   return request("/nodes", {
     iatas: iatasParam(iatas),
     cursor: params?.cursor,
@@ -286,6 +303,7 @@ export function getObserversPage(
   iatas: string[] | undefined,
   params?: { cursor?: number; limit?: number; type?: string; broker?: string; status?: string; name?: string },
 ): Promise<CursorPage<ObserverSummary>> {
+  if (noIatas(iatas)) return Promise.resolve(emptyPage());
   return request("/observers", {
     iatas: iatasParam(iatas),
     cursor: params?.cursor,
@@ -317,60 +335,60 @@ export function getNodeNeighbors(nodeId: string): Promise<NodeNeighbor[]> {
 
 // stats endpoints
 
-export function getStatsOverview(iatas?: string[]): Promise<StatsOverview> {
-  return request("/stats/overview", { iatas: iatasParam(iatas) });
+export function getStatsSeries(since: number, until: number, iatas?: StatsRegion, signal?: AbortSignal): Promise<StatsSeries> {
+  return request("/stats/series", { since, until, ...statsRegionParams(iatas) }, signal);
 }
 
-export function getStatsObservations(iatas?: string[], since?: number, signal?: AbortSignal): Promise<ObservationPoint[]> {
-  return request("/stats/observations", { iatas: iatasParam(iatas), since }, signal);
+export function getStatsObservations(iatas?: StatsRegion, since?: number, signal?: AbortSignal): Promise<ObservationPoint[]> {
+  return request("/stats/observations", { ...statsRegionParams(iatas), since }, signal);
 }
 
-export function getSignalStats(since: number, until: number, iatas?: string[], signal?: AbortSignal): Promise<SignalStats> {
-  return request("/stats/signal", { since, until, iatas: iatasParam(iatas) }, signal);
+export function getSignalStats(since: number, until: number, iatas?: StatsRegion, signal?: AbortSignal): Promise<SignalStats> {
+  return request("/stats/signal", { since, until, ...statsRegionParams(iatas) }, signal);
 }
 
-export function getPathStats(since: number, until: number, iatas?: string[], signal?: AbortSignal): Promise<PathStats> {
-  return request("/stats/paths", { since, until, iatas: iatasParam(iatas) }, signal);
+export function getPathStats(since: number, until: number, iatas?: StatsRegion, signal?: AbortSignal): Promise<PathStats> {
+  return request("/stats/paths", { since, until, ...statsRegionParams(iatas) }, signal);
 }
 
-export function getPayloadBreakdown(iatas?: string[], since?: number): Promise<PayloadBreakdownItem[]> {
-  return request("/stats/payload-breakdown", { iatas: iatasParam(iatas), since });
+export function getPayloadBreakdown(iatas?: StatsRegion, since?: number): Promise<PayloadBreakdownItem[]> {
+  return request("/stats/payload-breakdown", { ...statsRegionParams(iatas), since });
 }
 
-export function getTopNodes(iatas?: string[], limit = 10): Promise<TopNode[]> {
-  return request("/stats/top-nodes", { iatas: iatasParam(iatas), limit });
+export function getTopNodes(iatas?: StatsRegion, since?: number, limit = 10): Promise<TopNode[]> {
+  return request("/stats/top-nodes", { ...statsRegionParams(iatas), since, limit });
 }
 
-export function getTopObservers(iatas?: string[], since?: number, limit = 10): Promise<TopObserver[]> {
-  return request("/stats/top-observers", { iatas: iatasParam(iatas), since, limit });
+export function getTopObservers(iatas?: StatsRegion, since?: number, limit = 10): Promise<TopObserver[]> {
+  return request("/stats/top-observers", { ...statsRegionParams(iatas), since, limit });
 }
 
-export function getTopAdvertisers(iatas?: string[], since?: number, limit = 10): Promise<TopAdvertiser[]> {
-  return request("/stats/top-advertisers", { iatas: iatasParam(iatas), since, limit });
+export function getTopAdvertisers(iatas?: StatsRegion, since?: number, limit = 10): Promise<TopAdvertiser[]> {
+  return request("/stats/top-advertisers", { ...statsRegionParams(iatas), since, limit });
 }
 
-export function getTopTalkers(iatas?: string[], since?: number, limit = 10): Promise<TopTalker[]> {
-  return request("/stats/top-talkers", { iatas: iatasParam(iatas), since, limit });
+export function getTopTalkers(iatas?: StatsRegion, since?: number, limit = 10): Promise<TopTalker[]> {
+  return request("/stats/top-talkers", { ...statsRegionParams(iatas), since, limit });
 }
 
-export function getRadioPresets(iatas?: string[]): Promise<RadioPreset[]> {
-  return request("/stats/radio-presets", { iatas: iatasParam(iatas) });
+export function getRadioPresets(iatas?: StatsRegion): Promise<RadioPreset[]> {
+  return request("/stats/radio-presets", { ...statsRegionParams(iatas) });
 }
 
-export function getStatsNodeTypes(iatas?: string[]): Promise<NodeTypeCount[]> {
-  return request("/stats/node-types", { iatas: iatasParam(iatas) });
+export function getStatsNodeTypes(iatas?: StatsRegion): Promise<NodeTypeCount[]> {
+  return request("/stats/node-types", { ...statsRegionParams(iatas) });
 }
 
 // Repeaters/room servers whose clock has drifted past the server threshold, worst-first. Not
 // time-windowed and top-N only (no cursor), so callers pass a generous limit and page client-side.
-export function getClockDrift(iatas?: string[], limit = 100): Promise<ClockDriftEntry[]> {
-  return request("/stats/clock-drift", { iatas: iatasParam(iatas), limit });
+export function getClockDrift(iatas?: StatsRegion, limit = 100): Promise<ClockDriftEntry[]> {
+  return request("/stats/clock-drift", { ...statsRegionParams(iatas), limit });
 }
 
 // renamed from getScopes to avoid colliding with the /scopes name list; this is the /stats/scopes
 // aggregate (packet/observer/node counts), filtered by the selected IATAs.
-export function getStatsScopes(iatas?: string[], signal?: AbortSignal): Promise<ScopeStats[]> {
-  return request("/stats/scopes", { iatas: iatasParam(iatas) }, signal);
+export function getStatsScopes(iatas?: StatsRegion, since?: number, signal?: AbortSignal): Promise<ScopeStats[]> {
+  return request("/stats/scopes", { ...statsRegionParams(iatas), since }, signal);
 }
 
 export function getObserverTelemetry(
diff --git a/src/api/ws-manager.ts b/src/api/ws-manager.ts
index f60eaebc..f4f86978 100644
--- a/src/api/ws-manager.ts
+++ b/src/api/ws-manager.ts
@@ -257,7 +257,8 @@ export class WsManager {
   }
 
   private sendSubscribe(): void {
-    if (!this.filter) return;
+    // the server reads an empty IATA list as "all", so a region with no IATAs subscribes to nothing
+    if (!this.filter || this.filter.iatas?.length === 0) return;
     const id = `sub-${this.nextId()}`;
     this.lastSubscribeId = id;
     this.send({
diff --git a/src/features/map/MapView.tsx b/src/features/map/MapView.tsx
index 674e08b0..054d7f33 100644
--- a/src/features/map/MapView.tsx
+++ b/src/features/map/MapView.tsx
@@ -173,7 +173,7 @@ export function MapView({ wsManager, selectedNodeId, onSelectNode }: MapViewProp
   const fitPoints = useMemo<[number, number][] | null>(() => {
     const withCoords = (iatas ?? []).filter((i) => i.lat != null && i.lon != null);
     if (withCoords.length === 0) return null;
-    const scope = selectedIatas && selectedIatas.length > 0 ? new Set(selectedIatas) : null;
+    const scope = selectedIatas ? new Set(selectedIatas) : null;
     const chosen = scope ? withCoords.filter((i) => scope.has(i.iata)) : withCoords;
     return chosen.length > 0 ? chosen.map((i) => [i.lon!, i.lat!]) : null;
   }, [iatas, selectedIatas]);
@@ -182,7 +182,7 @@ export function MapView({ wsManager, selectedNodeId, onSelectNode }: MapViewProp
   // which resolves to a 204 and is dropped). Only fetched while the layer is toggled on.
   const borderIatas = useMemo(() => {
     const all = (iatas ?? []).map((i) => i.iata);
-    return selectedIatas && selectedIatas.length > 0 ? all.filter((c) => selectedIatas.includes(c)) : all;
+    return selectedIatas ? all.filter((c) => selectedIatas.includes(c)) : all;
   }, [iatas, selectedIatas]);
   const borderData = useMapBordersData(borderIatas, borders);
 
diff --git a/src/features/observers/ObserverSidebar.tsx b/src/features/observers/ObserverSidebar.tsx
index c21e0a66..626fe054 100644
--- a/src/features/observers/ObserverSidebar.tsx
+++ b/src/features/observers/ObserverSidebar.tsx
@@ -2,9 +2,9 @@ import { useMemo, useState } from "react";
 import { useQuery } from "@tanstack/react-query";
 import { useTranslation } from "react-i18next";
 import { getTopObservers } from "../../api/client";
-import { useRegion } from "../../hooks/useRegion";
 import { formatCount } from "../../lib/formatters";
 import { Segmented } from "../stats/Segmented";
+import { useStatsRegion } from "../stats/useStats";
 import { RANGE_MS, type StatsRange } from "../stats/types";
 import { observerName as nameOf } from "./observer-filter";
 import { deriveObserverStatus } from "./observer-status";
@@ -18,12 +18,12 @@ export function ObserverSidebar({ observers, filtered, isPending, isError, onRet
   range: StatsRange; selectedId: string | null; onSelect: (id: string) => void;
 }) {
   const { t } = useTranslation();
-  const { iatas, regionKey } = useRegion();
+  const { where, regionKey } = useStatsRegion();
   const [sort, setSort] = useState<Sort>("activity");
 
   const activity = useQuery({
     queryKey: ["observer-sidebar-activity", regionKey, range],
-    queryFn: () => getTopObservers(iatas, Date.now() - RANGE_MS[range], TOP),
+    queryFn: () => getTopObservers(where, Date.now() - RANGE_MS[range], TOP),
     staleTime: 30_000,
   });
 
diff --git a/src/features/routes/RouteTable.tsx b/src/features/routes/RouteTable.tsx
index 41702422..19828f54 100644
--- a/src/features/routes/RouteTable.tsx
+++ b/src/features/routes/RouteTable.tsx
@@ -240,7 +240,7 @@ export function RouteTable(actions: RouteActions) {
   // region = all). Filtering by IATA stays client-side, consistent with the other tabs.
   const rows = useMemo(() => {
     if (search) return isCross ? [] : searchRoutes;
-    if (!iatas || iatas.length === 0) return listRoutes;
+    if (!iatas) return listRoutes;
     const set = new Set(iatas);
     return listRoutes.filter((r) => set.has(r.iata));
   }, [search, isCross, searchRoutes, listRoutes, iatas]);
diff --git a/src/features/stats/CompareObserversTab.tsx b/src/features/stats/CompareObserversTab.tsx
index 55574ef0..f750e323 100644
--- a/src/features/stats/CompareObserversTab.tsx
+++ b/src/features/stats/CompareObserversTab.tsx
@@ -6,6 +6,7 @@ import { InfoTip } from "../../components/InfoTip";
 import { SectionInfo } from "./SectionInfo";
 import { getObserver, getObserverComparison } from "../../api/client";
 import { useRegion } from "../../hooks/useRegion";
+import { useStatsRegion } from "./useStats";
 import { OBSERVER_UUID } from "../observers/observer-id";
 import { ObserverPicker } from "../observers/ObserverPicker";
 import { Card } from "./cards";
@@ -82,7 +83,8 @@ function ComparisonForm({ initial, onCompare }: { initial: Selection | null; onC
 
 export function CompareObserversTab() {
   const { t } = useTranslation();
-  const { iatas, regionKey } = useRegion();
+  const { iatas, emptyRegion } = useRegion();
+  const { where, regionKey } = useStatsRegion();
   const [params, setParams] = useSearchParams();
   const keys = ["compareA", "compareB", "compareSince", "compareUntil"];
   const supplied = keys.some((key) => params.has(key));
@@ -94,7 +96,7 @@ export function CompareObserversTab() {
   const selection = valid ? parsed : null;
   const result = useQuery({
     queryKey: ["observer-comparison", regionKey, selection],
-    queryFn: ({ signal }) => getObserverComparison(iatas, selection!, signal),
+    queryFn: ({ signal }) => getObserverComparison(where, selection!, signal),
     enabled: selection !== null,
     retry: false, staleTime: 30_000, refetchOnWindowFocus: false,
   });
@@ -133,7 +135,7 @@ export function CompareObserversTab() {
       </Card>
       {selection && <Card title={t("observerCompare.floodHeard")}>
         <p className="mb-2 break-words text-sm text-text-normal">{t("observerCompare.pair", { a: observerA.data?.displayName ?? selection.observerA, b: observerB.data?.displayName ?? selection.observerB })}</p>
-        <p className="mb-3 flex flex-wrap items-center gap-x-2 break-words text-sm text-text-muted">{new Date(selection.since).toLocaleString()} – {new Date(selection.until).toLocaleString()} · {iatas?.join(", ") || t("observerCompare.allRegions")}<InfoTip text={t("observerCompare.localTimeNote")} /></p>
+        <p className="mb-3 flex flex-wrap items-center gap-x-2 break-words text-sm text-text-muted">{new Date(selection.since).toLocaleString()} – {new Date(selection.until).toLocaleString()} · {iatas ? iatas.join(", ") || emptyRegion : t("observerCompare.allRegions")}<InfoTip text={t("observerCompare.localTimeNote")} /></p>
         {result.isFetching && <p role="status" className="text-sm text-text-muted">{t("observerCompare.comparing")}</p>}
         {result.isError && <div role="alert" className="text-sm text-danger"><p>{result.error.message}</p><button type="button" onClick={() => void result.refetch()} className="mt-2 text-primary">{t("observerCompare.retryComparison")}</button></div>}
         {data && !result.isError && <>
diff --git a/src/features/stats/MeshTab.tsx b/src/features/stats/MeshTab.tsx
index aa79119b..dca6fd29 100644
--- a/src/features/stats/MeshTab.tsx
+++ b/src/features/stats/MeshTab.tsx
@@ -1,59 +1,42 @@
 import { useTranslation } from "react-i18next";
 import { useMemo } from "react";
-import { formatCount } from "../../lib/formatters";
+import { formatCount, formatUtc } from "../../lib/formatters";
 import { useChartColors, nodeTypeColor } from "./chartTheme";
-import { useStatsOverview, useStatsObservations, usePayloadBreakdown, useTopNodes, useTopObservers, useRadioPresets, useScopes, useNodeTypes } from "./useStats";
+import { useStatsSeries, usePayloadBreakdown, useTopNodes, useTopObservers, useRadioPresets, useScopes, useNodeTypes } from "./useStats";
 import { observationsAreaOption, leaderboardOption, typeBarOption, donutOption, presetBarsOption } from "./chartOptions";
 import { ChartCard, StatCard } from "./cards";
-import { useLiveOverview } from "./useLiveStats";
 import { aggregatePresets, formatPreset, payloadBarItems } from "./transforms";
-import type { WsManager } from "../../api/ws-manager";
-import type { ObservationPoint, StatsRange } from "./types";
+import type { StatsRange, StatsSeries, SeriesValues } from "./types";
 
 // Keep unavailable values in the cache, but do not display them under the current filters.
 function readyData<T>(query: { data: T | undefined; isSuccess: boolean; isPlaceholderData: boolean }) {
   return query.isSuccess && !query.isPlaceholderData ? query.data : undefined;
 }
 
-// The observations endpoint returns one row per hour+iata; collapse to one row per hour (a no-op for a
-// single selected region). uniquePackets / activeObservers summed across iatas are approximate.
-function aggregateByHour(points: ObservationPoint[]) {
-  const byHour = new Map<number, { hour: number; observationCount: number; uniquePackets: number; activeObservers: number }>();
-  for (const p of points) {
-    const cur = byHour.get(p.hour) ?? { hour: p.hour, observationCount: 0, uniquePackets: 0, activeObservers: 0 };
-    cur.observationCount += p.observationCount;
-    cur.uniquePackets += p.uniquePackets;
-    cur.activeObservers += p.activeObservers;
-    byHour.set(p.hour, cur);
-  }
-  return [...byHour.values()].sort((a, b) => a.hour - b.hour);
+// Missing and partial hours carry no values; keep their slot as null so the sparkline shows a gap.
+function spark(series: StatsSeries | undefined, pick: (v: SeriesValues) => number) {
+  return series?.hours.map((h) => (h.values ? pick(h.values) : null));
 }
 
 interface MeshTabProps {
   range: StatsRange;
   onSelectObserver: (observerId: string) => void;
-  wsManager: WsManager;
 }
 
-export function MeshTab({ range, onSelectObserver, wsManager }: MeshTabProps) {
+export function MeshTab({ range, onSelectObserver }: MeshTabProps) {
   const { t } = useTranslation();
   const colors = useChartColors();
-  useLiveOverview(wsManager);
-  const overview = useStatsOverview();
-  const observations = useStatsObservations(range);
-  // top-row KPIs are a fixed 24h snapshot, so their sparklines use a dedicated
-  // 24h series rather than the range-driven one (deduped by query key when range is 24h)
-  const overviewObs = useStatsObservations("24h");
+  const series = useStatsSeries("24h");
+  const observations = useStatsSeries(range);
   const payload = usePayloadBreakdown(range);
-  const topNodes = useTopNodes(10);
+  const topNodes = useTopNodes(range, 10);
   const topObservers = useTopObservers(range, 8);
   const radioPresets = useRadioPresets();
-  const scopes = useScopes();
+  const scopes = useScopes(range);
   const nodeTypes = useNodeTypes();
 
-  const ov = readyData(overview);
+  const ov = readyData(series);
   const observationsData = readyData(observations);
-  const overviewObsData = readyData(overviewObs);
   const payloadData = readyData(payload);
   const topNodesData = readyData(topNodes);
   const topObserversData = readyData(topObservers);
@@ -61,7 +44,10 @@ export function MeshTab({ range, onSelectObserver, wsManager }: MeshTabProps) {
   const scopesData = readyData(scopes);
   const nodeTypesData = readyData(nodeTypes);
 
-  const obs = useMemo(() => aggregateByHour(observationsData ?? []), [observationsData]);
+  const obs = useMemo(
+    () => (observationsData?.hours ?? []).map((h) => ({ hour: h.hour, observations: h.values?.observations ?? null, uniquePackets: h.values?.uniquePackets ?? null })),
+    [observationsData],
+  );
   const obsOption = useMemo(
     () => observationsAreaOption(obs, colors, { observations: t("mesh.observations"), uniquePackets: t("charts.uniquePackets") }),
     [obs, colors, t],
@@ -70,7 +56,7 @@ export function MeshTab({ range, onSelectObserver, wsManager }: MeshTabProps) {
   const nodeRows = useMemo(
     () =>
       (topNodesData ?? []).map((n) => ({
-        name: n.nodeName ?? n.nodeId.slice(0, 8),
+        name: n.nodeName ?? n.publicKey.slice(0, 8),
         value: n.observationCount,
         color: nodeTypeColor(n.nodeTypeName, colors),
       })),
@@ -122,20 +108,21 @@ export function MeshTab({ range, onSelectObserver, wsManager }: MeshTabProps) {
     [scopesData],
   );
 
-  const kpiObs = useMemo(() => aggregateByHour(overviewObsData ?? []), [overviewObsData]);
-  const obsSpark = useMemo(() => kpiObs.slice(-24).map((p) => p.observationCount), [kpiObs]);
-  const observerSpark = useMemo(() => kpiObs.slice(-24).map((p) => p.activeObservers), [kpiObs]);
+  const obsSpark = useMemo(() => spark(ov, (v) => v.observations), [ov]);
+  const observerSpark = useMemo(() => spark(ov, (v) => v.activeObservers), [ov]);
 
-  // top-row KPIs are the overview endpoint's fixed 24h snapshot; range only drives the charts below
-  const ovWindow = t("mesh.lastHours", { hours: ov?.windowHours ?? 24 });
+  // top-row KPIs are the last 24 rollable hours, so they lag the clock by 35–95 min; range only drives the charts below
+  const ovWindow = ov
+    ? t("mesh.lastHoursTo", { hours: Math.round((ov.until - ov.since) / 3_600_000), time: formatUtc(ov.until, { timeOnly: true }) })
+    : t("mesh.lastHours", { hours: 24 });
 
   return (
     <div className="mx-auto flex w-full min-w-0 max-w-[1200px] flex-col gap-3.5 p-4">
       <div className="grid grid-cols-2 gap-3 sm:grid-cols-4">
-        <StatCard label={t("mesh.totalPackets")} sublabel={ovWindow} accent="var(--color-primary)" value={formatCount(ov?.totalPackets)} />
-        <StatCard label={t("mesh.observations")} sublabel={ovWindow} accent="var(--color-green)" value={formatCount(ov?.totalObservations)} spark={obsSpark} />
-        <StatCard label={t("mesh.activeObservers")} sublabel={ovWindow} accent="var(--color-secondary)" value={ov?.activeObservers ?? "—"} spark={observerSpark} />
-        <StatCard label={t("mesh.activeIatas")} sublabel={ovWindow} accent="var(--color-warn)" value={ov?.activeIatas ?? "—"} />
+        <StatCard label={t("mesh.totalPackets")} sublabel={ovWindow} accent="var(--color-primary)" value={formatCount(ov?.summary.uniquePackets)} />
+        <StatCard label={t("mesh.observations")} sublabel={ovWindow} accent="var(--color-green)" value={formatCount(ov?.summary.observations)} spark={obsSpark} />
+        <StatCard label={t("mesh.activeObservers")} sublabel={ovWindow} accent="var(--color-secondary)" value={ov?.summary.activeObservers ?? "—"} spark={observerSpark} />
+        <StatCard label={t("mesh.activeIatas")} sublabel={ovWindow} accent="var(--color-warn)" value={ov?.summary.activeIatas ?? "—"} />
       </div>
 
       <ChartCard
@@ -144,7 +131,7 @@ export function MeshTab({ range, onSelectObserver, wsManager }: MeshTabProps) {
         option={obsOption}
         isLoading={observations.isPending || observations.isPlaceholderData}
         isError={observations.isError}
-        isEmpty={obs.length === 0}
+        isEmpty={!observationsData?.completeHours}
       />
 
       <div className="grid grid-cols-1 gap-3.5 lg:grid-cols-2">
@@ -161,8 +148,7 @@ export function MeshTab({ range, onSelectObserver, wsManager }: MeshTabProps) {
           isError={payload.isError}
           isEmpty={payloadItems.length === 0}
         />
-        {/* counts are all-time; the server's 7d filter only prunes the roster to recently-heard nodes */}
-        <ChartCard title={t("mesh.topNodes")} height={208} option={nodesOption} isLoading={topNodes.isPending || topNodes.isPlaceholderData} isError={topNodes.isError} isEmpty={nodeRows.length === 0} />
+        <ChartCard title={t("mesh.topNodes", { range })} height={208} option={nodesOption} isLoading={topNodes.isPending || topNodes.isPlaceholderData} isError={topNodes.isError} isEmpty={nodeRows.length === 0} />
         <ChartCard title={t("mesh.nodeTypes")} height={208} option={typesOption} isLoading={nodeTypes.isPending || nodeTypes.isPlaceholderData} isError={nodeTypes.isError} isEmpty={typeRows.length === 0} />
         <ChartCard title={t("mesh.radioPresets")} height={208} option={presetsOption} isLoading={radioPresets.isPending || radioPresets.isPlaceholderData} isError={radioPresets.isError} isEmpty={presetRows.length === 0} />
 
diff --git a/src/features/stats/ScopesTab.tsx b/src/features/stats/ScopesTab.tsx
index 1a0b83f1..e6823119 100644
--- a/src/features/stats/ScopesTab.tsx
+++ b/src/features/stats/ScopesTab.tsx
@@ -7,10 +7,11 @@ import { useChartColors } from "./chartTheme";
 import { Card, ChartCard, StatCard } from "./cards";
 import { scopeChartOption, scopeSummary } from "./scopes";
 import { formatCount } from "../../lib/formatters";
+import type { StatsRange } from "./types";
 
-export function ScopesTab() {
+export function ScopesTab({ range }: { range: StatsRange }) {
   const { t } = useTranslation();
-  const query = useScopes();
+  const query = useScopes(range);
   const colors = useChartColors();
   const [search, setSearch] = useState("");
   const loading = query.isPending || query.isLoading || query.isPlaceholderData;
diff --git a/src/features/stats/StatsOverview.tsx b/src/features/stats/StatsOverview.tsx
index 9eff5c56..8f1ef4f5 100644
--- a/src/features/stats/StatsOverview.tsx
+++ b/src/features/stats/StatsOverview.tsx
@@ -1,6 +1,5 @@
 import { useCallback, useEffect, useState } from "react";
 import { useNavigate, useSearchParams } from "react-router-dom";
-import type { WsManager } from "../../api/ws-manager";
 import { StatsSubHeader } from "./StatsSubHeader";
 import { SectionInfoSlot } from "./section-info-slot";
 import { MeshTab } from "./MeshTab";
@@ -22,13 +21,12 @@ const asTab = (v: string | null): StatsTab => (TABS.includes(v as StatsTab) ? (v
 const asRange = (v: string | null): StatsRange => (RANGES.includes(v as StatsRange) ? (v as StatsRange) : "7d");
 
 interface StatsOverviewProps {
-  wsManager: WsManager;
   onViewNode?: (nodeId: string) => void;
 }
 
 // Stats page shell: an analytics sub-header and range over the active sub-tab. Sub-tab and range live
 // in the URL (?statsTab/?range) so the view is shareable.
-export function StatsOverview({ wsManager, onViewNode }: StatsOverviewProps) {
+export function StatsOverview({ onViewNode }: StatsOverviewProps) {
   const [params, setParams] = useSearchParams();
   const navigate = useNavigate();
   const tab = asTab(params.get("statsTab"));
@@ -67,11 +65,11 @@ export function StatsOverview({ wsManager, onViewNode }: StatsOverviewProps) {
       <StatsSubHeader tab={tab} onTabChange={handleTab} range={range} onRangeChange={handleRange} infoSlot={setInfoSlot} />
       <SectionInfoSlot.Provider value={infoSlot}>
       <div className="min-h-0 flex-1 overflow-y-auto">
-        {tab === "mesh" && <MeshTab range={range} onSelectObserver={handleSelectObserver} wsManager={wsManager} />}
+        {tab === "mesh" && <MeshTab range={range} onSelectObserver={handleSelectObserver} />}
         {tab === "traffic" && <TrafficTab range={range} />}
         {tab === "signal" && <SignalTab range={range} />}
         {tab === "paths" && <PathsTab range={range} />}
-        {tab === "scopes" && <ScopesTab />}
+        {tab === "scopes" && <ScopesTab range={range} />}
         {tab === "talkers" && <TalkersTab range={range} onViewNode={onViewNode} />}
         {tab === "clockdrift" && <ClockDriftTab />}
         {tab === "graph" && <NeighbourGraphTab />}
diff --git a/src/features/stats/StatsSubHeader.tsx b/src/features/stats/StatsSubHeader.tsx
index ffef33a7..5150838d 100644
--- a/src/features/stats/StatsSubHeader.tsx
+++ b/src/features/stats/StatsSubHeader.tsx
@@ -132,7 +132,7 @@ export function StatsSubHeader({ tab, onTabChange, range, onRangeChange, infoSlo
       <span ref={infoSlot} data-section-info className="flex shrink-0 empty:hidden" />
       </div>
       {/* Comparison has explicit dates; graph and clock drift have no rolling window. */}
-      {tab !== "graph" && tab !== "clockdrift" && tab !== "compare" && tab !== "scopes" && (
+      {tab !== "graph" && tab !== "clockdrift" && tab !== "compare" && (
         <Segmented
           className="shrink-0"
           options={rangeOptions}
diff --git a/src/features/stats/TalkersTab.tsx b/src/features/stats/TalkersTab.tsx
index 83fce659..a67a7fef 100644
--- a/src/features/stats/TalkersTab.tsx
+++ b/src/features/stats/TalkersTab.tsx
@@ -48,13 +48,13 @@ export function TalkersTab({ range, onViewNode }: TalkersTabProps) {
         cell: (a) => (
           <div className="flex min-w-0 items-center gap-2">
             <span className={`truncate ${a.nodeName ? "text-text-normal" : "italic text-text-dim"}`}>
-              {a.nodeName ?? a.nodeId.slice(0, 8)}
+              {a.nodeName ?? a.publicKey.slice(0, 8)}
             </span>
             <Badge variant="default">{a.nodeTypeName}</Badge>
             <IataChip>{a.iata}</IataChip>
           </div>
         ),
-        sortValue: (a) => a.nodeName ?? a.nodeId,
+        sortValue: (a) => a.nodeName ?? a.publicKey,
       },
       { header: t("talkers.flood"), className: "tabular-nums", cell: (a) => split(a.floodAdvertCount), sortValue: (a) => a.floodAdvertCount },
       { header: t("talkers.direct"), className: "tabular-nums", cell: (a) => split(a.directAdvertCount), sortValue: (a) => a.directAdvertCount },
@@ -75,9 +75,9 @@ export function TalkersTab({ range, onViewNode }: TalkersTabProps) {
           <DataTable
             columns={advertiserColumns}
             rows={advertisers}
-            rowKey={(a) => a.nodeId}
+            rowKey={(a) => a.publicKey}
             selectedKey={null}
-            onSelect={(id) => { if (id) onViewNode?.(id); }}
+            onSelect={(key) => { const id = advertisers.find((a) => a.publicKey === key)?.nodeId; if (id) onViewNode?.(id); }}
             isLoading={advertisersLoading}
             emptyLabel={topAdvertisers.isError ? t("common.loadFailed") : t("talkers.noAdvertisers")}
           />
diff --git a/src/features/stats/cards.tsx b/src/features/stats/cards.tsx
index 5287bd19..ae05df4d 100644
--- a/src/features/stats/cards.tsx
+++ b/src/features/stats/cards.tsx
@@ -26,19 +26,25 @@ export function Card({
   );
 }
 
-function Sparkline({ values, color }: { values: number[]; color: string }) {
-  if (values.length < 2) return <div className="mt-1.5 h-[20px]" />;
+function Sparkline({ values, color }: { values: (number | null)[]; color: string }) {
+  const known = values.filter((v): v is number => v !== null);
+  if (values.length < 2 || known.length < 2) return <div className="mt-1.5 h-[20px]" />;
   const w = 120;
   const h = 20;
-  const max = Math.max(...values);
-  const min = Math.min(...values);
+  const max = Math.max(...known);
+  const min = Math.min(...known);
   const range = max - min || 1;
-  const pts = values
-    .map((v, i) => `${(i / (values.length - 1)) * w},${h - 1 - ((v - min) / range) * (h - 2)}`)
-    .join(" ");
+  // A null hour breaks the line, so an outage shows as a gap rather than a straight join.
+  const runs: string[][] = [[]];
+  values.forEach((v, i) => {
+    if (v === null) runs.push([]);
+    else runs[runs.length - 1]!.push(`${(i / (values.length - 1)) * w},${h - 1 - ((v - min) / range) * (h - 2)}`);
+  });
   return (
     <svg width="100%" height={h} viewBox={`0 0 ${w} ${h}`} preserveAspectRatio="none" className="mt-1.5" aria-hidden>
-      <polyline fill="none" stroke={color} strokeWidth="1.5" points={pts} />
+      {runs.filter((run) => run.length > 1).map((run) => (
+        <polyline key={run[0]} fill="none" stroke={color} strokeWidth="1.5" points={run.join(" ")} />
+      ))}
     </svg>
   );
 }
@@ -54,7 +60,7 @@ export function StatCard({
   label: string;
   value: ReactNode;
   accent: string; // CSS color for the sparkline, e.g. "var(--color-primary)"
-  spark?: number[];
+  spark?: (number | null)[];
   sublabel?: ReactNode;
 }) {
   return (
diff --git a/src/features/stats/chartOptions.ts b/src/features/stats/chartOptions.ts
index 0d41d00e..d349f5ea 100644
--- a/src/features/stats/chartOptions.ts
+++ b/src/features/stats/chartOptions.ts
@@ -29,13 +29,12 @@ function valueAxis(c: ChartColors, extra: Record<string, unknown> = {}) {
 
 // ---- Mesh ----
 
+// null values are hours the server hasn't rolled (or never can); echarts breaks the line there.
 export function observationsAreaOption(
-  points: { hour: number; observationCount: number; uniquePackets: number }[],
+  points: { hour: number; observations: number | null; uniquePackets: number | null }[],
   c: ChartColors,
   labels = { observations: "Observations", uniquePackets: "Unique packets" },
 ): EChartsOption {
-  const obs = points.map((p) => [p.hour, p.observationCount]);
-  const uniq = points.map((p) => [p.hour, p.uniquePackets]);
   return {
     animation: false,
     backgroundColor: "transparent",
@@ -58,7 +57,7 @@ export function observationsAreaOption(
         type: "line",
         smooth: true,
         symbol: "none",
-        data: obs,
+        data: points.map((p) => [p.hour, p.observations]),
         lineStyle: { color: c.primary, width: 2 },
         itemStyle: { color: c.primary },
         areaStyle: {
@@ -77,7 +76,7 @@ export function observationsAreaOption(
         type: "line",
         smooth: true,
         symbol: "none",
-        data: uniq,
+        data: points.map((p) => [p.hour, p.uniquePackets]),
         lineStyle: { color: c.secondary, width: 1.3, type: "dashed" },
         itemStyle: { color: c.secondary },
       },
diff --git a/src/features/stats/types.ts b/src/features/stats/types.ts
index fe00fcfb..e20af524 100644
--- a/src/features/stats/types.ts
+++ b/src/features/stats/types.ts
@@ -16,20 +16,40 @@ export interface ObserverComparison {
   both: number;
 }
 
-export interface StatsOverview {
-  totalPackets: number;
-  totalObservations: number;
+// beacon-server /stats/series: hourly rollups. Only complete hours carry values; the summary covers
+// those, and observers/IATAs/scopes are distinct across the window so they don't sum from the hours.
+export interface SeriesValues {
+  observations: number;
+  uniquePackets: number;
   activeObservers: number;
   activeIatas: number;
-  windowHours: number;
+  scopedPackets: number;
+  activeScopes: number;
+  maxPathEntries: number;
+  snrSum: number;
+  snrSamples: number;
+  rssiSum: number;
+  rssiSamples: number;
+}
+export interface SeriesHour {
+  hour: number; // epoch ms, UTC hour start
+  status: "complete" | "partial" | "missing";
+  values: SeriesValues | null;
+}
+export interface StatsSeries {
+  since: number;
+  until: number;
+  revision: number;
+  earliestComplete: number | null;
+  completeHours: number;
+  hours: SeriesHour[];
+  summary: SeriesValues;
 }
 
 export interface ObservationPoint {
   hour: number; // epoch ms, start of the hourly bucket
   iata: string;
   observationCount: number;
-  uniquePackets: number;
-  activeObservers: number;
 }
 
 export interface PayloadBreakdownItem {
@@ -39,7 +59,8 @@ export interface PayloadBreakdownItem {
 }
 
 export interface TopNode {
-  nodeId: string;
+  nodeId: string | null; // null once the node row is deleted; key rows by publicKey
+  publicKey: string;
   nodeName: string | null;
   nodeType: number;
   nodeTypeName: string;
@@ -57,7 +78,8 @@ export interface TopObserver {
 }
 
 export interface TopAdvertiser {
-  nodeId: string;
+  nodeId: string | null; // null once the node row is deleted; key rows by publicKey
+  publicKey: string;
   nodeName: string | null;
   nodeType: number;
   nodeTypeName: string;
diff --git a/src/features/stats/useLiveStats.ts b/src/features/stats/useLiveStats.ts
index e0c9f19f..f14e3fe1 100644
--- a/src/features/stats/useLiveStats.ts
+++ b/src/features/stats/useLiveStats.ts
@@ -1,58 +1,9 @@
-import { useCallback, useEffect, useRef } from "react";
+import { useCallback } from "react";
 import { useQueryClient } from "@tanstack/react-query";
-import { useRegion } from "../../hooks/useRegion";
-import { useWsPacketHandler, useWsObserverStatusHandler } from "../../hooks/useWsHandlers";
+import { useWsObserverStatusHandler } from "../../hooks/useWsHandlers";
 import type { WsManager } from "../../api/ws-manager";
-import type { WsPacketObservation, WsObserverStatus } from "../../types/ws";
-import type { StatsOverview, StatsRange } from "./types";
-
-// Live overview KPIs: every packetObservation bumps the cached overview counters (no refetch). High
-// frequency, so increments are coalesced and flushed once per animation frame. The overview query also
-// refetches periodically (useStatsOverview) so the live deltas self-correct against the server.
-// both totalPackets and totalObservations feed the top KPIs, so both bumps count.
-export function useLiveOverview(wsManager: WsManager) {
-  const { regionKey } = useRegion();
-  const qc = useQueryClient();
-  const pending = useRef({ packets: 0, obs: 0 });
-  const raf = useRef<number | null>(null);
-
-  const flush = useCallback(() => {
-    raf.current = null;
-    const { packets, obs } = pending.current;
-    if (!packets && !obs) return;
-    pending.current = { packets: 0, obs: 0 };
-    // setQueryData would clear an error state and show stale numbers as healthy — drop the deltas instead.
-    if (qc.getQueryState(["stats-overview", regionKey])?.status !== "success") return;
-    qc.setQueryData<StatsOverview>(["stats-overview", regionKey], (old) =>
-      old
-        ? { ...old, totalPackets: old.totalPackets + packets, totalObservations: old.totalObservations + obs }
-        : old,
-    );
-  }, [qc, regionKey]);
-
-  const onPacket = useCallback(
-    (data: WsPacketObservation["data"]) => {
-      pending.current.obs += 1;
-      if (data.packet?.isFirstObservation) pending.current.packets += 1;
-      if (raf.current == null) raf.current = requestAnimationFrame(flush);
-    },
-    [flush],
-  );
-
-  useWsPacketHandler(wsManager, onPacket);
-
-  // drop counts accumulated for the previous region so they don't bleed into the new one's KPIs
-  useEffect(() => {
-    pending.current = { packets: 0, obs: 0 };
-  }, [regionKey]);
-
-  useEffect(
-    () => () => {
-      if (raf.current != null) cancelAnimationFrame(raf.current);
-    },
-    [],
-  );
-}
+import type { WsObserverStatus } from "../../types/ws";
+import type { StatsRange } from "./types";
 
 // When the selected observer reports a status update, refresh its header + telemetry so battery,
 // uptime, and the newest points reflect the change. Status messages are infrequent, so a refetch is fine.
diff --git a/src/features/stats/useStats.ts b/src/features/stats/useStats.ts
index d2edd306..8023045d 100644
--- a/src/features/stats/useStats.ts
+++ b/src/features/stats/useStats.ts
@@ -1,7 +1,7 @@
 import { useQuery, keepPreviousData } from "@tanstack/react-query";
 import { useRegion } from "../../hooks/useRegion";
 import {
-  getStatsOverview,
+  getStatsSeries,
   getStatsObservations,
   getPayloadBreakdown,
   getTopNodes,
@@ -12,6 +12,7 @@ import {
   getStatsScopes,
   getStatsNodeTypes,
   getClockDrift,
+  type StatsRegion,
 } from "../../api/client";
 import { RANGE_MS, type StatsRange } from "./types";
 
@@ -22,28 +23,46 @@ const common = {
   refetchOnWindowFocus: false,
 } as const;
 
+// A region with no member IATAs is sent by slug so the server returns zeros rather than every IATA.
+export function useStatsRegion() {
+  const { iatas, regionKey, isResolved, emptyRegion } = useRegion();
+  const where: StatsRegion = emptyRegion ? { region: emptyRegion } : iatas;
+  return { where, regionKey, isResolved };
+}
+
 // `since` is computed inside queryFn so refetches use a fresh window without churning the query key.
 const sinceFor = (range: StatsRange) => Date.now() - RANGE_MS[range];
 
-export function useStatsOverview() {
-  const { iatas, regionKey } = useRegion();
+const HOUR_MS = 3_600_000;
+// Same end as the server's overview window: the hour starting at H can be rolled from H + 95 min.
+export function rolledWindow(range: StatsRange, now = Date.now()) {
+  const until = Math.floor((now - 95 * 60_000) / HOUR_MS) * HOUR_MS + HOUR_MS;
+  return { since: until - RANGE_MS[range], until };
+}
+
+export function useStatsSeries(range: StatsRange) {
+  const { where, regionKey, isResolved } = useStatsRegion();
   return useQuery({
-    queryKey: ["stats-overview", regionKey],
-    queryFn: () => getStatsOverview(iatas),
+    queryKey: ["stats-series", isResolved === false ? `${regionKey}:pending` : regionKey, range],
+    enabled: isResolved !== false,
+    queryFn: ({ signal }) => {
+      if (isResolved === false) throw new Error("Selected region is not available yet");
+      const { since, until } = rolledWindow(range);
+      return getStatsSeries(since, until, where, signal);
+    },
     ...common,
-    // self-correct the WS-accumulated live counters against the server
     refetchInterval: 60_000,
   });
 }
 
 export function useStatsObservations(range: StatsRange) {
-  const { iatas, regionKey, isResolved } = useRegion();
+  const { where, regionKey, isResolved } = useStatsRegion();
   return useQuery({
     queryKey: ["stats-observations", isResolved === false ? `${regionKey}:pending` : regionKey, range],
     enabled: isResolved !== false,
     queryFn: ({ signal }) => {
       if (isResolved === false) throw new Error("Selected region is not available yet");
-      return getStatsObservations(iatas, sinceFor(range), signal);
+      return getStatsObservations(where, sinceFor(range), signal);
     },
     ...common,
     // feeds the observations chart + sparklines and gets no WS bumps, so refetch to stay fresh
@@ -52,88 +71,88 @@ export function useStatsObservations(range: StatsRange) {
 }
 
 export function usePayloadBreakdown(range: StatsRange) {
-  const { iatas, regionKey } = useRegion();
+  const { where, regionKey } = useStatsRegion();
   return useQuery({
     queryKey: ["stats-payload", regionKey, range],
-    queryFn: () => getPayloadBreakdown(iatas, sinceFor(range)),
+    queryFn: () => getPayloadBreakdown(where, sinceFor(range)),
     ...common,
   });
 }
 
-export function useTopNodes(limit = 10) {
-  const { iatas, regionKey } = useRegion();
+export function useTopNodes(range: StatsRange, limit = 10) {
+  const { where, regionKey } = useStatsRegion();
   return useQuery({
-    queryKey: ["stats-top-nodes", regionKey, limit],
-    queryFn: () => getTopNodes(iatas, limit),
+    queryKey: ["stats-top-nodes", regionKey, range, limit],
+    queryFn: () => getTopNodes(where, sinceFor(range), limit),
     ...common,
   });
 }
 
 export function useTopObservers(range: StatsRange, limit = 10) {
-  const { iatas, regionKey } = useRegion();
+  const { where, regionKey } = useStatsRegion();
   return useQuery({
     queryKey: ["stats-top-observers", regionKey, range, limit],
-    queryFn: () => getTopObservers(iatas, sinceFor(range), limit),
+    queryFn: () => getTopObservers(where, sinceFor(range), limit),
     ...common,
   });
 }
 
 export function useTopAdvertisers(range: StatsRange, limit = 10) {
-  const { iatas, regionKey } = useRegion();
+  const { where, regionKey } = useStatsRegion();
   return useQuery({
     queryKey: ["stats-top-advertisers", regionKey, range, limit],
-    queryFn: () => getTopAdvertisers(iatas, sinceFor(range), limit),
+    queryFn: () => getTopAdvertisers(where, sinceFor(range), limit),
     ...common,
   });
 }
 
 export function useTopTalkers(range: StatsRange, limit = 10) {
-  const { iatas, regionKey } = useRegion();
+  const { where, regionKey } = useStatsRegion();
   return useQuery({
     queryKey: ["stats-top-talkers", regionKey, range, limit],
-    queryFn: () => getTopTalkers(iatas, sinceFor(range), limit),
+    queryFn: () => getTopTalkers(where, sinceFor(range), limit),
     ...common,
   });
 }
 
 export function useRadioPresets() {
-  const { iatas, regionKey } = useRegion();
+  const { where, regionKey } = useStatsRegion();
   return useQuery({
     queryKey: ["stats-radio-presets", regionKey],
-    queryFn: () => getRadioPresets(iatas),
+    queryFn: () => getRadioPresets(where),
     ...common,
   });
 }
 
 // node-types is a population census (no time window), so the key is region-only
 export function useNodeTypes() {
-  const { iatas, regionKey } = useRegion();
+  const { where, regionKey } = useStatsRegion();
   return useQuery({
     queryKey: ["stats-node-types", regionKey],
-    queryFn: () => getStatsNodeTypes(iatas),
+    queryFn: () => getStatsNodeTypes(where),
     ...common,
   });
 }
 
 // clock drift reflects each node's latest measured drift, not a windowed aggregate, so region-only
 export function useClockDrift(limit = 100) {
-  const { iatas, regionKey } = useRegion();
+  const { where, regionKey } = useStatsRegion();
   return useQuery({
     queryKey: ["stats-clock-drift", regionKey, limit],
-    queryFn: () => getClockDrift(iatas, limit),
+    queryFn: () => getClockDrift(where, limit),
     ...common,
   });
 }
 
-// Scope counts have no time window, but the selected region changes their membership.
-export function useScopes() {
-  const { iatas, regionKey, isResolved } = useRegion();
+// Packet counts are windowed; observer and node counts are current membership.
+export function useScopes(range: StatsRange) {
+  const { where, regionKey, isResolved } = useStatsRegion();
   return useQuery({
-    queryKey: ["stats-scopes", isResolved === false ? `${regionKey}:pending` : regionKey],
+    queryKey: ["stats-scopes", isResolved === false ? `${regionKey}:pending` : regionKey, range],
     enabled: isResolved !== false,
     queryFn: ({ signal }) => {
       if (isResolved === false) throw new Error("Selected region is not available yet");
-      return getStatsScopes(iatas, signal);
+      return getStatsScopes(where, sinceFor(range), signal);
     },
     ...common,
     refetchInterval: 60_000,
diff --git a/src/features/stats/useWindowedStats.ts b/src/features/stats/useWindowedStats.ts
index f6209283..2289c90b 100644
--- a/src/features/stats/useWindowedStats.ts
+++ b/src/features/stats/useWindowedStats.ts
@@ -1,5 +1,6 @@
 import { useQuery } from "@tanstack/react-query";
-import { useRegion } from "../../hooks/useRegion";
+import type { StatsRegion } from "../../api/client";
+import { useStatsRegion } from "./useStats";
 import { RANGE_MS, type StatsRange } from "./types";
 
 // Shared by usePathStats/useSignalStats (and any future /stats/* window query): resolves the
@@ -7,9 +8,9 @@ import { RANGE_MS, type StatsRange } from "./types";
 export function useWindowedStats<T>(
   key: string,
   range: StatsRange,
-  fetch: (since: number, until: number, iatas: string[] | undefined, signal?: AbortSignal) => Promise<T>,
+  fetch: (since: number, until: number, where: StatsRegion, signal?: AbortSignal) => Promise<T>,
 ) {
-  const { iatas, regionKey, isResolved } = useRegion();
+  const { where, regionKey, isResolved } = useStatsRegion();
   return useQuery({
     queryKey: [key, isResolved === false ? `${regionKey}:pending` : regionKey, range],
     enabled: isResolved !== false,
@@ -17,7 +18,7 @@ export function useWindowedStats<T>(
       if (isResolved === false) throw new Error("Selected region is not available yet");
       // Shared minute boundaries let viewers reuse server aggregates without changing the key every render.
       const until = Math.floor(Date.now() / 60_000) * 60_000;
-      return fetch(until - RANGE_MS[range], until, iatas, signal);
+      return fetch(until - RANGE_MS[range], until, where, signal);
     },
     staleTime: 30_000,
     refetchInterval: 60_000,
diff --git a/src/features/traces/TraceList.tsx b/src/features/traces/TraceList.tsx
index 14674eb4..acb67989 100644
--- a/src/features/traces/TraceList.tsx
+++ b/src/features/traces/TraceList.tsx
@@ -7,6 +7,7 @@ import { SkeletonRows } from "../../components/SkeletonRows";
 import { EmptyState } from "../../components/EmptyState";
 import { Timestamp } from "../../components/Timestamp";
 import { Badge } from "../../components/Badge";
+import { InfoTip } from "../../components/InfoTip";
 import { Segmented } from "../stats/Segmented";
 import { snrLevel, SIGNAL_LEVEL_CLASSES, formatSnr } from "../../lib/formatters";
 import { TraceDetailPanel } from "./TraceDetailPanel";
@@ -121,12 +122,15 @@ export function TraceList({ onAnalyze, onViewNode }: TraceListProps) {
           <span className="font-mono text-[11px] text-text-dim">
             {tags ? t("traces.tagCount", { count: tags.length }) : ""}
           </span>
-          <Segmented
-            options={typeOptions}
-            value={typeFilter}
-            onChange={(v) => setTypeFilter(v as "" | TraceType)}
-            ariaLabel={t("traces.typeLabel")}
-          />
+          <div className="flex items-center gap-2">
+            <InfoTip text={t("traces.typeHint")} />
+            <Segmented
+              options={typeOptions}
+              value={typeFilter}
+              onChange={(v) => setTypeFilter(v as "" | TraceType)}
+              ariaLabel={t("traces.typeLabel")}
+            />
+          </div>
         </div>
         <div className="flex-1 overflow-y-auto p-3 flex flex-col gap-2">
           {isLoading ? (
diff --git a/src/hooks/region-selection.ts b/src/hooks/region-selection.ts
index 04695988..befefd19 100644
--- a/src/hooks/region-selection.ts
+++ b/src/hooks/region-selection.ts
@@ -32,6 +32,16 @@ export function resolveIatas(
   return [...set].sort();
 }
 
+// A selection of loaded regions with no member IATAs (and no picked IATAs) resolves like "all"; return
+// one of its slugs so callers can ask the server for that region instead of every IATA.
+export function emptyRegionSlug(
+  selection: RegionSelection,
+  regionIatas: ReadonlyMap<string, string[]>,
+): string | undefined {
+  if (isAllRegions(selection) || !selection.regions.every((slug) => regionIatas.has(slug))) return undefined;
+  return resolveIatas(selection, regionIatas) ? undefined : selection.regions[0];
+}
+
 // Stable query-key fragment for a resolved IATA list. "*" stands in for "all regions".
 export function regionKey(iatas: string[] | undefined): string {
   return iatas && iatas.length > 0 ? iatas.join(",") : "*";
diff --git a/src/hooks/useRegion.tsx b/src/hooks/useRegion.tsx
index fac78248..f131f8b5 100644
--- a/src/hooks/useRegion.tsx
+++ b/src/hooks/useRegion.tsx
@@ -4,6 +4,7 @@ import { useQuery } from "@tanstack/react-query";
 import { getRegions, getRegion } from "../api/client";
 import {
   resolveIatas,
+  emptyRegionSlug,
   regionKey as toRegionKey,
   serializeSelection,
   type RegionSelection,
@@ -78,9 +79,10 @@ export function useRegions(): RegionsData {
 }
 
 export interface RegionFilter {
-  iatas: string[] | undefined; // resolved member IATAs to query; undefined = all regions
+  iatas: string[] | undefined; // resolved member IATAs to query; undefined = all regions, [] = a region with none
   regionKey: string; // stable query-key fragment ("*" = all)
   isResolved?: boolean; // false while a selected region's member IATAs are unavailable
+  emptyRegion?: string; // slug of a selected region that has no member IATAs
 }
 
 // The resolved geographic filter consumers pass to queries: the flattened IATA list plus a stable key.
@@ -90,6 +92,12 @@ export function useRegion(): RegionFilter {
 
   return useMemo(() => {
     const iatas = resolveIatas(selection, regionIatas);
-    return { iatas, regionKey: toRegionKey(iatas), isResolved: selection.regions.every((slug) => regionIatas.has(slug)) };
+    const emptyRegion = emptyRegionSlug(selection, regionIatas);
+    return {
+      iatas: emptyRegion ? [] : iatas,
+      regionKey: emptyRegion ? `region:${emptyRegion}` : toRegionKey(iatas),
+      isResolved: selection.regions.every((slug) => regionIatas.has(slug)),
+      emptyRegion,
+    };
   }, [selection, regionIatas]);
 }
diff --git a/src/i18n/locales/en.json b/src/i18n/locales/en.json
index bbb0bcd7..cf5e1f52 100644
--- a/src/i18n/locales/en.json
+++ b/src/i18n/locales/en.json
@@ -75,11 +75,12 @@
       "activeObservers": "Active observers",
       "activeIatas": "Active areas",
       "lastHours": "Last {{hours}}h",
+      "lastHoursTo": "Last {{hours}}h · to {{time}} UTC",
       "observationsTitle": "Observations · {{range}}",
       "topObservers": "Top observers · {{range}}",
       "payloadTypes": "Payload types · {{range}}",
       "obs": "{{value}} obs",
-      "topNodes": "Top nodes · all time",
+      "topNodes": "Top nodes · {{range}}",
       "nodeTypes": "Node types · all time",
       "radioPresets": "Radio presets · all time",
       "scope": "Scope",
@@ -229,7 +230,7 @@
       "scopedPackets": "Scoped packets",
       "memberships": "Observers",
       "defaultNodes": "Default-scope nodes",
-      "measurement": "An observer can belong to more than one scope. These counts aren't limited to a time range.",
+      "measurement": "Packet counts cover the selected range. Observer and node counts are current, and an observer can belong to more than one scope.",
       "packetsTitle": "Packets by scope",
       "membershipsTitle": "Observers by scope",
       "countsTitle": "Scope counts",
@@ -748,6 +749,7 @@
       "iata_one": "{{count}} iata",
       "iata_other": "{{count}} iata",
       "typeLabel": "Trace type",
+      "typeHint": "Filters whole tags: TRACE if any packet in the tag is multi-hop, otherwise PING. Scope and time filters match the tag's first hearing; counts and times always cover the whole tag.",
       "all": "All",
       "trace": "Trace",
       "ping": "Ping",
diff --git a/src/i18n/locales/fr.json b/src/i18n/locales/fr.json
index 2f0e26e7..6ad52b19 100644
--- a/src/i18n/locales/fr.json
+++ b/src/i18n/locales/fr.json
@@ -77,11 +77,12 @@
       "activeObservers": "Observateurs actifs",
       "activeIatas": "Zones actives",
       "lastHours": "Dernières {{hours}} h",
+      "lastHoursTo": "Dernières {{hours}} h · jusqu’à {{time}} UTC",
       "observationsTitle": "Observations · {{range}}",
       "topObservers": "Meilleurs observateurs · {{range}}",
       "payloadTypes": "Types de paquets · {{range}}",
       "obs": "{{value}} obs",
-      "topNodes": "Meilleurs nœuds · historique complet",
+      "topNodes": "Meilleurs nœuds · {{range}}",
       "nodeTypes": "Types de nœuds · historique complet",
       "radioPresets": "Préréglages radio · historique complet",
       "scope": "Scope",
@@ -233,7 +234,7 @@
       "scopedPackets": "Paquets avec scope",
       "memberships": "Observateurs",
       "defaultNodes": "Nœuds du scope par défaut",
-      "measurement": "Un observateur peut appartenir à plusieurs scopes. Ces effectifs ne sont pas limités à une période.",
+      "measurement": "Les paquets couvrent la période sélectionnée. Les observateurs et les nœuds sont comptés à l’heure actuelle, et un observateur peut appartenir à plusieurs scopes.",
       "packetsTitle": "Paquets par scope",
       "membershipsTitle": "Observateurs par scope",
       "countsTitle": "Effectifs des scopes",
@@ -770,6 +771,7 @@
       "iata_other": "{{count}} iata",
       "iata_many": "{{count}} iata",
       "typeLabel": "Type de trace",
+      "typeHint": "Filtre des étiquettes entières : TRACE si un paquet de l'étiquette est multi-saut, sinon PING. Les filtres de portée et de temps portent sur la première réception de l'étiquette ; les comptes et les heures couvrent toujours toute l'étiquette.",
       "all": "Tous",
       "trace": "Trace",
       "ping": "Ping",
diff --git a/tests/api/analytics-client.test.ts b/tests/api/analytics-client.test.ts
index 2684a2dc..12107fa4 100644
--- a/tests/api/analytics-client.test.ts
+++ b/tests/api/analytics-client.test.ts
@@ -1,5 +1,5 @@
 import { afterEach, expect, it, vi } from "vitest";
-import { getStatsObservations, getStatsScopes, getSignalStats, getPathStats } from "../../src/api/client";
+import { getStatsObservations, getStatsScopes, getStatsSeries, getTopNodes, getSignalStats, getPathStats } from "../../src/api/client";
 
 afterEach(() => vi.unstubAllGlobals());
 
@@ -18,10 +18,12 @@ it("forwards region and cancellation to both aggregate endpoints, omitting an em
   const fetcher = vi.fn<typeof fetch>(async () => ({ ok: true, json: async () => [] }) as Response);
   vi.stubGlobal("fetch", fetcher);
   const controller = new AbortController();
-  await getStatsScopes(["YVR", "YOW"], controller.signal);
-  expect(new URL(fetcher.mock.calls[0]![0] as string).searchParams.get("iatas")).toBe("YVR,YOW");
+  await getStatsScopes(["YVR", "YOW"], 5678, controller.signal);
+  const scopesUrl = new URL(fetcher.mock.calls[0]![0] as string);
+  expect(scopesUrl.searchParams.get("iatas")).toBe("YVR,YOW");
+  expect(scopesUrl.searchParams.get("since")).toBe("5678");
   expect(fetcher.mock.calls[0]![1]).toEqual({ signal: controller.signal });
-  await getStatsScopes([]);
+  await getStatsScopes([], 5678);
   expect(new URL(fetcher.mock.calls[1]![0] as string).searchParams.has("iatas")).toBe(false);
   await getStatsObservations(["YOW"], 1234, controller.signal);
   const url = new URL(fetcher.mock.calls[2]![0] as string);
@@ -40,3 +42,23 @@ it("sends explicit signal window bounds, regional filters and cancellation", asy
   expect(Object.fromEntries(url.searchParams)).toEqual({ since: "0", until: "1000", iatas: "YVR,YYJ" });
   expect(fetcher.mock.calls[0]![1]).toEqual({ signal: controller.signal });
 });
+
+it("sends the series window, regional filters and cancellation", async () => {
+  const fetcher = vi.fn<typeof fetch>(async () => ({ ok: true, json: async () => ({}) }) as Response);
+  vi.stubGlobal("fetch", fetcher);
+  const controller = new AbortController();
+  await getStatsSeries(0, 1000, ["YVR", "YYJ"], controller.signal);
+  const url = new URL(fetcher.mock.calls[0]![0] as string);
+  expect(url.pathname).toContain("/stats/series");
+  expect(Object.fromEntries(url.searchParams)).toEqual({ since: "0", until: "1000", iatas: "YVR,YYJ" });
+  expect(fetcher.mock.calls[0]![1]).toEqual({ signal: controller.signal });
+});
+
+it("windows top nodes by since", async () => {
+  const fetcher = vi.fn<typeof fetch>(async () => ({ ok: true, json: async () => [] }) as Response);
+  vi.stubGlobal("fetch", fetcher);
+  await getTopNodes(["YVR"], 1234, 10);
+  const url = new URL(fetcher.mock.calls[0]![0] as string);
+  expect(url.pathname).toContain("/stats/top-nodes");
+  expect(Object.fromEntries(url.searchParams)).toEqual({ iatas: "YVR", since: "1234", limit: "10" });
+});
diff --git a/tests/api/client.test.ts b/tests/api/client.test.ts
index 66660825..dd2c30d3 100644
--- a/tests/api/client.test.ts
+++ b/tests/api/client.test.ts
@@ -1,5 +1,5 @@
 import { afterEach, describe, expect, it, vi } from "vitest";
-import { getPackets, getNodesPage, getObserversPage, getScopes, getKnownRoutesPage, searchKnownRoutes, getChannels, getChannelMessagesPage, getTraces, getTraceDetail, getStatsOverview, getTopObservers, getTopAdvertisers, getTopTalkers, getStatsNodeTypes, getClockDrift, getIataBorder, getObserverActivity, isNotFound } from "../../src/api/client";
+import { getPackets, getNodesPage, getObserversPage, getScopes, getKnownRoutesPage, searchKnownRoutes, getChannels, getChannelMessagesPage, getTraces, getTraceDetail, getStatsSeries, getTopObservers, getTopAdvertisers, getTopTalkers, getStatsNodeTypes, getClockDrift, getIataBorder, getObserverActivity, isNotFound } from "../../src/api/client";
 import type { Feature, Polygon } from "geojson";
 import type { NodeSummary } from "../../src/features/nodes/types";
 import type { ObserverSummary } from "../../src/features/observers/types";
@@ -402,12 +402,12 @@ describe("getObserversPage", () => {
 
 describe("stats endpoints", () => {
   it("joins the region's IATAs into the iatas param", async () => {
-    const getUrl = mockFetchOnce({ totalPackets: 0 });
+    const getUrl = mockFetchOnce({ hours: [] });
 
-    await getStatsOverview(["YOW", "YYZ"]);
+    await getStatsSeries(0, 1000, ["YOW", "YYZ"]);
 
     const url = new URL(getUrl());
-    expect(url.pathname).toContain("/stats/overview");
+    expect(url.pathname).toContain("/stats/series");
     expect(url.searchParams.get("iatas")).toBe("YOW,YYZ");
   });
 
@@ -456,6 +456,16 @@ describe("stats endpoints", () => {
     expect(url.searchParams.get("iatas")).toBe("YOW,YYZ");
   });
 
+  it("sends an empty region as region= so the server returns zeros instead of every IATA", async () => {
+    const getUrl = mockFetchOnce([]);
+
+    await getStatsNodeTypes({ region: "empty-region" });
+
+    const url = new URL(getUrl());
+    expect(url.searchParams.get("region")).toBe("empty-region");
+    expect(url.searchParams.has("iatas")).toBe(false);
+  });
+
   it("hits /stats/clock-drift with iatas/limit", async () => {
     const getUrl = mockFetchOnce([]);
 
@@ -618,3 +628,20 @@ describe("isNotFound", () => {
     expect(isNotFound(new Error("network down"))).toBe(false);
   });
 });
+
+describe("a region with no IATAs", () => {
+  it("returns empty results without asking the server, which would answer for every IATA", async () => {
+    const fetchSpy = vi.fn();
+    vi.stubGlobal("fetch", fetchSpy);
+    const empty = { items: [], nextCursor: null, hasMore: false };
+
+    await expect(getPackets([])).resolves.toEqual(empty);
+    await expect(getNodesPage([])).resolves.toEqual(empty);
+    await expect(getObserversPage([])).resolves.toEqual(empty);
+    await expect(getChannels({ iatas: [] })).resolves.toEqual(empty);
+    await expect(getChannelMessagesPage(1, { iatas: [] })).resolves.toEqual(empty);
+    await expect(getTraces([])).resolves.toEqual([]);
+    await expect(getScopes([])).resolves.toEqual([]);
+    expect(fetchSpy).not.toHaveBeenCalled();
+  });
+});
diff --git a/tests/api/ws-manager.test.ts b/tests/api/ws-manager.test.ts
index e6d8945d..033335b5 100644
--- a/tests/api/ws-manager.test.ts
+++ b/tests/api/ws-manager.test.ts
@@ -183,6 +183,21 @@ describe("WsManager", () => {
     ).not.toThrow();
   });
 
+  it("drops the subscription without resubscribing for a region with no IATAs", () => {
+    const mgr = new WsManager("ws://test/ws");
+    mgr.connect({ iatas: ["YOW"] });
+
+    const ws = MockWebSocket.instances[0]!;
+    ws.simulateOpen();
+    ws.simulateMessage({ v: 1, type: "hello", serverTime: 123, connectionId: "abc" });
+    ws.simulateMessage({ v: 1, type: "subscribed", id: "sub-1", subscriptionId: "s-1" });
+
+    mgr.updateSubscription({ iatas: [] });
+
+    const types = ws.sent.slice(1).map((m) => JSON.parse(m).type);
+    expect(types).toEqual(["unsubscribe"]);
+  });
+
   it("updates subscription without reconnecting", () => {
     const mgr = new WsManager("ws://test/ws");
     mgr.connect({ iatas: ["YOW"] });
diff --git a/tests/features/routes/RouteTable.test.tsx b/tests/features/routes/RouteTable.test.tsx
index af0278f2..60bb6493 100644
--- a/tests/features/routes/RouteTable.test.tsx
+++ b/tests/features/routes/RouteTable.test.tsx
@@ -201,3 +201,15 @@ it("translates the search bar, headers and empty state", async () => {
   expect(screen.getByRole("button", { name: "Rechercher" })).toBeInTheDocument();
   expect(await screen.findByText("Aucun trajet")).toBeInTheDocument();
 });
+
+it("shows no routes for a region with no IATAs", async () => {
+  vi.mocked(getRegions).mockResolvedValue([{ id: 2, slug: "empty", name: "Empty" }]);
+  vi.mocked(getRegion).mockResolvedValue({ id: 2, slug: "empty", name: "Empty", iatas: [] });
+  mockGetKnownRoutesPage.mockResolvedValue({ items: [{ id: 1, iata: "CCC", hopCount: 1, hops: [], firstSeen: 1, lastSeen: 5, observationCount: 9 }], nextCursor: null, hasMore: false });
+
+  renderTable({ regions: ["empty"], iatas: [] });
+
+  await waitFor(() => expect(getRegion).toHaveBeenCalled());
+  expect(await screen.findByText("No routes")).toBeInTheDocument();
+  expect(screen.queryByText("9")).not.toBeInTheDocument();
+});
diff --git a/tests/features/stats/MeshTab.test.tsx b/tests/features/stats/MeshTab.test.tsx
index c8591f5c..f7cf3db2 100644
--- a/tests/features/stats/MeshTab.test.tsx
+++ b/tests/features/stats/MeshTab.test.tsx
@@ -3,26 +3,33 @@ import { act, render, screen, fireEvent, waitFor, within } from "@testing-librar
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { MeshTab } from "../../../src/features/stats/MeshTab";
 import i18n from "../../../src/i18n";
-import { getStatsOverview, getStatsObservations, getPayloadBreakdown, getTopNodes, getTopObservers, getRadioPresets, getStatsScopes, getStatsNodeTypes } from "../../../src/api/client";
-import type { WsManager } from "../../../src/api/ws-manager";
+import { getStatsSeries, getPayloadBreakdown, getTopNodes, getTopObservers, getRadioPresets, getStatsScopes, getStatsNodeTypes } from "../../../src/api/client";
 import type { EChartsOption } from "../../../src/features/stats/echarts-setup";
-import type { StatsOverview, StatsRange } from "../../../src/features/stats/types";
+import type { SeriesValues, StatsSeries, StatsRange } from "../../../src/features/stats/types";
 
-const region = { iatas: ["YVR"], regionKey: "YVR", isResolved: true };
-const overview = { totalPackets: 111, totalObservations: 222, activeObservers: 3, activeIatas: 4, windowHours: 24 };
-const points = [1, 2].map((hour) => ({ hour: hour * 3_600_000, iata: "YVR", observationCount: hour * 10, uniquePackets: hour, activeObservers: hour }));
+const region: { iatas: string[] | undefined; regionKey: string; isResolved: boolean; emptyRegion?: string } = { iatas: ["YVR"], regionKey: "YVR", isResolved: true };
+const H = 3_600_000;
+const values = (v: Partial<SeriesValues>): SeriesValues => ({ observations: 0, uniquePackets: 0, activeObservers: 0, activeIatas: 0, scopedPackets: 0, activeScopes: 0, maxPathEntries: 0, snrSum: 0, snrSamples: 0, rssiSum: 0, rssiSamples: 0, ...v });
+const series: StatsSeries = {
+  since: -21 * H, until: 3 * H, revision: 1, earliestComplete: 0, completeHours: 2,
+  hours: [
+    { hour: 0, status: "complete", values: values({ observations: 100, uniquePackets: 50, activeObservers: 2 }) },
+    { hour: H, status: "complete", values: values({ observations: 122, uniquePackets: 61, activeObservers: 3 }) },
+    { hour: 2 * H, status: "missing", values: null },
+  ],
+  summary: values({ observations: 222, uniquePackets: 111, activeObservers: 3, activeIatas: 4 }),
+};
+const withSummary = (v: Partial<SeriesValues>): StatsSeries => ({ ...series, summary: { ...series.summary, ...v } });
 vi.mock("../../../src/hooks/useRegion", () => ({ useRegion: () => region }));
-vi.mock("../../../src/features/stats/useLiveStats", () => ({ useLiveOverview: vi.fn() }));
-vi.mock("../../../src/api/client", () => ({ getStatsOverview: vi.fn(), getStatsObservations: vi.fn(), getPayloadBreakdown: vi.fn(), getTopNodes: vi.fn(), getTopObservers: vi.fn(), getRadioPresets: vi.fn(), getStatsScopes: vi.fn(), getStatsNodeTypes: vi.fn() }));
+vi.mock("../../../src/api/client", () => ({ getStatsSeries: vi.fn(), getPayloadBreakdown: vi.fn(), getTopNodes: vi.fn(), getTopObservers: vi.fn(), getRadioPresets: vi.fn(), getStatsScopes: vi.fn(), getStatsNodeTypes: vi.fn() }));
 vi.mock("../../../src/features/stats/EChart", () => ({ EChart: ({ option, onEvents }: { option: EChartsOption; onEvents?: Record<string, (p: unknown) => void> }) => <button data-testid="chart" onClick={() => onEvents?.click?.({ dataIndex: 0 })}>{JSON.stringify(option)}</button> }));
 
 const clients: QueryClient[] = [];
 beforeEach(() => {
-  vi.clearAllMocks(); region.iatas = ["YVR"]; region.regionKey = "YVR"; region.isResolved = true;
-  vi.mocked(getStatsOverview).mockReset().mockResolvedValue(overview);
-  vi.mocked(getStatsObservations).mockReset().mockResolvedValue(points);
+  vi.clearAllMocks(); region.iatas = ["YVR"]; region.regionKey = "YVR"; region.isResolved = true; region.emptyRegion = undefined;
+  vi.mocked(getStatsSeries).mockReset().mockResolvedValue(series);
   vi.mocked(getPayloadBreakdown).mockReset().mockResolvedValue([{ payloadType: 4, payloadTypeName: "ADVERT", count: 17 }]);
-  vi.mocked(getTopNodes).mockReset().mockResolvedValue([{ nodeId: "node-id", nodeName: "Old node", nodeType: 2, nodeTypeName: "Repeater", iata: "YVR", observationCount: 15, lastHeard: 0 }]);
+  vi.mocked(getTopNodes).mockReset().mockResolvedValue([{ nodeId: "node-id", publicKey: "abcdef0123456789", nodeName: "Old node", nodeType: 2, nodeTypeName: "Repeater", iata: "YVR", observationCount: 15, lastHeard: 0 }]);
   vi.mocked(getTopObservers).mockReset().mockResolvedValue([{ observerId: "observer-id", displayName: "Old observer", observerType: null, iata: "YVR", observationCount: 16 }]);
   vi.mocked(getRadioPresets).mockReset().mockResolvedValue([{ preset: "910.525,62.5,7", iata: "YVR", sourceType: "node", count: 18 }]);
   vi.mocked(getStatsScopes).mockReset().mockResolvedValue([{ name: "#old", packetCount: 19, observerCount: 2, nodeCount: 1 }]);
@@ -39,7 +46,7 @@ function deferred<T>() {
 function mount(range: StatsRange = "24h") {
   const client = new QueryClient({ defaultOptions: { queries: { retry: false } } }); clients.push(client);
   const onSelectObserver = vi.fn();
-  const view = (range: StatsRange) => <QueryClientProvider client={client}><MeshTab range={range} onSelectObserver={onSelectObserver} wsManager={{} as WsManager} /></QueryClientProvider>;
+  const view = (range: StatsRange) => <QueryClientProvider client={client}><MeshTab range={range} onSelectObserver={onSelectObserver} /></QueryClientProvider>;
   const result = render(view(range));
   return { client, onSelectObserver, container: result.container, rerender: (next: StatsRange) => result.rerender(view(next)) };
 }
@@ -48,9 +55,8 @@ async function loaded() { await waitFor(() => expect(screen.getAllByTestId("char
 
 it("hides all previous-region values and sparklines until their own requests resolve", async () => {
   const { rerender, container } = mount(); await loaded();
-  const next = deferred<StatsOverview>();
-  vi.mocked(getStatsOverview).mockReturnValue(next.promise);
-  vi.mocked(getStatsObservations).mockImplementation(() => new Promise(() => {}));
+  const next = deferred<StatsSeries>();
+  vi.mocked(getStatsSeries).mockReturnValue(next.promise);
   vi.mocked(getPayloadBreakdown).mockImplementation(() => new Promise(() => {}));
   vi.mocked(getTopNodes).mockImplementation(() => new Promise(() => {}));
   vi.mocked(getTopObservers).mockImplementation(() => new Promise(() => {}));
@@ -58,59 +64,84 @@ it("hides all previous-region values and sparklines until their own requests res
   vi.mocked(getStatsScopes).mockImplementation(() => new Promise(() => {}));
   vi.mocked(getStatsNodeTypes).mockImplementation(() => new Promise(() => {}));
   region.iatas = ["YOW"]; region.regionKey = "YOW"; rerender("24h");
-  await waitFor(() => expect(getStatsOverview).toHaveBeenCalledWith(["YOW"]));
+  await waitFor(() => expect(getStatsSeries).toHaveBeenCalledWith(expect.any(Number), expect.any(Number), ["YOW"], expect.any(AbortSignal)));
   expect(within(card("Total packets")).queryByText("111")).not.toBeInTheDocument();
   expect(within(card("Total packets")).getByText("—")).toBeInTheDocument();
   expect(screen.queryAllByTestId("chart")).toHaveLength(0);
   expect(container.querySelectorAll("polyline")).toHaveLength(0);
   expect(screen.queryByText("#old")).not.toBeInTheDocument();
   expect(screen.queryByText("17 obs")).not.toBeInTheDocument();
-  await act(() => next.resolve({ ...overview, totalPackets: 333 }));
+  await act(() => next.resolve(withSummary({ uniquePackets: 333 })));
   await within(card("Total packets")).findByText("333");
-  expect(screen.queryAllByTestId("chart")).toHaveLength(0);
+  expect(screen.getAllByTestId("chart")).toHaveLength(1);
+  within(card("Observations · 24h")).getByTestId("chart");
 });
 
 it("hides pending range charts while retaining fixed-24h KPIs, sparklines and population panels", async () => {
   const { rerender, container } = mount(); await loaded();
-  vi.mocked(getStatsObservations).mockImplementation(() => new Promise(() => {}));
+  vi.mocked(getStatsSeries).mockImplementation(() => new Promise(() => {}));
   vi.mocked(getPayloadBreakdown).mockImplementation(() => new Promise(() => {}));
   vi.mocked(getTopObservers).mockImplementation(() => new Promise(() => {}));
+  vi.mocked(getTopNodes).mockImplementation(() => new Promise(() => {}));
   rerender("7d");
   expect(within(card("Observations · 7d")).getByText("Loading…")).toBeInTheDocument();
   expect(within(card("Top observers · 7d")).getByText("Loading…")).toBeInTheDocument();
   expect(within(card("Payload types · 7d")).getByText("Loading…")).toBeInTheDocument();
+  expect(within(card("Top nodes · 7d")).getByText("Loading…")).toBeInTheDocument();
   expect(screen.queryByText("17 obs")).not.toBeInTheDocument();
-  expect(screen.getAllByTestId("chart")).toHaveLength(3);
+  expect(screen.getAllByTestId("chart")).toHaveLength(2);
   expect(within(card("Total packets")).getByText("111")).toBeInTheDocument();
   expect(container.querySelectorAll("polyline")).toHaveLength(2);
-  expect(screen.getByText("#old")).toBeInTheDocument();
-  expect(getStatsOverview).toHaveBeenCalledOnce();
-  expect(getStatsObservations).toHaveBeenCalledTimes(2);
-  expect(getTopNodes).toHaveBeenCalledOnce();
+  expect(getStatsSeries).toHaveBeenCalledTimes(2);
+  expect(getTopNodes).toHaveBeenCalledTimes(2);
 });
 
-it("hides failed overview values without discarding the cache or healthy panels, then recovers", async () => {
-  const { client } = mount(); await loaded();
-  vi.mocked(getStatsOverview).mockRejectedValue(new Error("controlled overview failure"));
-  await act(() => client.refetchQueries({ queryKey: ["stats-overview"] }));
+it("hides failed series values and sparklines without discarding the cache or healthy panels, then recovers", async () => {
+  const { client, container } = mount(); await loaded();
+  vi.mocked(getStatsSeries).mockRejectedValue(new Error("controlled series failure"));
+  await act(() => client.refetchQueries({ queryKey: ["stats-series"] }));
   await waitFor(() => expect(within(card("Total packets")).queryByText("111")).not.toBeInTheDocument());
   expect(within(card("Total packets")).getByText("—")).toBeInTheDocument();
-  expect(client.getQueryData(["stats-overview", "YVR"])).toEqual(overview);
-  expect(screen.getAllByTestId("chart")).toHaveLength(6);
-  vi.mocked(getStatsOverview).mockResolvedValue({ ...overview, totalPackets: 444 });
-  await act(() => client.refetchQueries({ queryKey: ["stats-overview"] }));
+  expect(container.querySelectorAll("polyline")).toHaveLength(0);
+  expect(client.getQueryData(["stats-series", "YVR", "24h"])).toEqual(series);
+  expect(within(card("Observations · 24h")).getByText("Failed to load")).toBeInTheDocument();
+  expect(screen.getAllByTestId("chart")).toHaveLength(5);
+  vi.mocked(getStatsSeries).mockResolvedValue(withSummary({ uniquePackets: 444 }));
+  await act(() => client.refetchQueries({ queryKey: ["stats-series"] }));
   await within(card("Total packets")).findByText("444");
 });
 
-it("hides only failed 24h sparklines while the selected-range chart and KPI values remain usable", async () => {
-  const { client, container } = mount("7d"); await loaded();
-  expect(container.querySelectorAll("polyline")).toHaveLength(2);
-  vi.mocked(getStatsObservations).mockRejectedValue(new Error("controlled sparkline failure"));
-  await act(() => client.refetchQueries({ queryKey: ["stats-observations", "YVR", "24h"], exact: true }));
-  await waitFor(() => expect(container.querySelectorAll("polyline")).toHaveLength(0));
-  expect(within(card("Total packets")).getByText("111")).toBeInTheDocument();
-  expect(within(card("Observations · 7d")).getByTestId("chart")).toBeInTheDocument();
-  expect(client.getQueryData(["stats-observations", "YVR", "24h"])).toEqual(points);
+it("draws sparklines from complete hours only", async () => {
+  const { container } = mount(); await loaded();
+  const lines = [...container.querySelectorAll("polyline")].map((l) => l.getAttribute("points")!.split(" ").length);
+  expect(lines).toEqual([2, 2]);
+});
+
+it("breaks sparklines at missing hours instead of joining across them", async () => {
+  const ok = (n: number) => ({ hour: n * H, status: "complete" as const, values: values({ observations: n + 1, activeObservers: n + 1 }) });
+  vi.mocked(getStatsSeries).mockResolvedValue({ ...series, hours: [ok(0), ok(1), { hour: 2 * H, status: "missing", values: null }, ok(3), ok(4)] });
+  const { container } = mount(); await loaded();
+  const lines = [...container.querySelectorAll("polyline")].map((l) => l.getAttribute("points")!.split(" "));
+  expect(lines.map((pts) => pts.length)).toEqual([2, 2, 2, 2]);
+  expect(lines[1]![0]!.split(",")[0]).toBe("90");
+});
+
+it("plots observations and unique packets from the series, leaving gaps for unrolled hours", async () => {
+  mount("7d"); await loaded();
+  const option = JSON.parse(within(card("Observations · 7d")).getByTestId("chart").textContent!);
+  expect(option.series.map((s: { data: unknown }) => s.data)).toEqual([
+    [[0, 100], [H, 122], [2 * H, null]],
+    [[0, 50], [H, 61], [2 * H, null]],
+  ]);
+  expect(getStatsSeries).toHaveBeenCalledTimes(2);
+  const spans = vi.mocked(getStatsSeries).mock.calls.map((c) => c[1] - c[0]);
+  expect(spans.sort()).toEqual([24 * H, 7 * 24 * H].sort());
+});
+
+it("names deleted top nodes by public key", async () => {
+  vi.mocked(getTopNodes).mockResolvedValue([{ nodeId: null, publicKey: "deadbeef00112233", nodeName: null, nodeType: 2, nodeTypeName: "Repeater", iata: "YVR", observationCount: 15, lastHeard: 0 }]);
+  mount(); await loaded();
+  expect(within(card("Top nodes · 24h")).getByTestId("chart").textContent).toContain("deadbeef");
 });
 
 it("does not report a cached payload total after a failed refresh", async () => {
@@ -125,21 +156,20 @@ it("does not report a cached payload total after a failed refresh", async () =>
 
 it("retains valid values, series, sparklines and observer navigation during same-key background refreshes", async () => {
   const { client, container, onSelectObserver } = mount(); await loaded();
-  const next = deferred<StatsOverview>(); vi.mocked(getStatsOverview).mockReturnValue(next.promise);
+  const next = deferred<StatsSeries>(); vi.mocked(getStatsSeries).mockReturnValue(next.promise);
   let refresh!: Promise<void>;
-  await act(async () => { refresh = client.refetchQueries({ queryKey: ["stats-overview"] }); });
+  await act(async () => { refresh = client.refetchQueries({ queryKey: ["stats-series"] }); });
   expect(within(card("Total packets")).getByText("111")).toBeInTheDocument();
   expect(screen.getAllByTestId("chart")).toHaveLength(6);
   expect(container.querySelectorAll("polyline")).toHaveLength(2);
   fireEvent.click(within(card("Top observers · 24h")).getByTestId("chart"));
   expect(onSelectObserver).toHaveBeenCalledWith("observer-id");
-  await act(async () => { next.resolve({ ...overview, totalPackets: 555 }); await refresh; });
+  await act(async () => { next.resolve(withSummary({ uniquePackets: 555 })); await refresh; });
   await within(card("Total packets")).findByText("555");
 });
 
 it("distinguishes initial loading from successful empty results and zero totals", async () => {
-  const next = deferred<StatsOverview>(); vi.mocked(getStatsOverview).mockReturnValue(next.promise);
-  vi.mocked(getStatsObservations).mockResolvedValue([]);
+  const next = deferred<StatsSeries>(); vi.mocked(getStatsSeries).mockReturnValue(next.promise);
   vi.mocked(getPayloadBreakdown).mockResolvedValue([]);
   vi.mocked(getTopNodes).mockResolvedValue([]);
   vi.mocked(getTopObservers).mockResolvedValue([]);
@@ -150,7 +180,7 @@ it("distinguishes initial loading from successful empty results and zero totals"
   expect(screen.queryByText("0 obs")).not.toBeInTheDocument();
   expect(screen.queryByText("No data")).not.toBeInTheDocument();
   expect(within(card("Total packets")).getByText("—")).toBeInTheDocument();
-  await act(() => next.resolve({ totalPackets: 0, totalObservations: 0, activeObservers: 0, activeIatas: 0, windowHours: 24 }));
+  await act(() => next.resolve({ ...series, completeHours: 0, hours: [], summary: values({}) }));
   await screen.findByText("0 obs");
   expect(screen.getAllByText("No data")).toHaveLength(7);
   expect(within(card("Total packets")).getByText("0")).toBeInTheDocument();
@@ -165,9 +195,9 @@ it("keeps the scope list collapsed until requested", async () => {
   expect(within(scopeList).getByText("#old")).toBeVisible();
 });
 
-it("labels the KPI cards as the last 24h whatever the selected range", async () => {
+it("labels the KPI cards with the rolled 24h window whatever the selected range", async () => {
   mount("7d"); await loaded();
-  expect(screen.getAllByText("Last 24h")).toHaveLength(4);
+  expect(screen.getAllByText("Last 24h · to 03:00 UTC")).toHaveLength(4);
   expect(within(card("Active areas")).getByText("4")).toBeInTheDocument();
 });
 
@@ -175,9 +205,9 @@ it("shows French labels for the KPIs, chart titles and scope table", async () =>
   await act(() => i18n.changeLanguage("fr"));
   mount(); await loaded();
   expect(within(card("Paquets totaux")).getByText("111")).toBeInTheDocument();
-  expect(screen.getAllByText("Dernières 24 h")).toHaveLength(4);
+  expect(screen.getAllByText("Dernières 24 h · jusqu’à 03:00 UTC")).toHaveLength(4);
   expect(screen.getByText("Observations · 24h")).toBeInTheDocument();
-  expect(screen.getByText("Meilleurs nœuds · historique complet")).toBeInTheDocument();
+  expect(screen.getByText("Meilleurs nœuds · 24h")).toBeInTheDocument();
   const typesChart = within(card("Types de nœuds · historique complet")).getByTestId("chart");
   expect(typesChart.textContent).toContain("NŒUDS");
   fireEvent.click(screen.getByText("Scopes", { exact: true }));
@@ -191,8 +221,15 @@ it("names the observation and preset chart series in French", async () => {
   await act(() => i18n.changeLanguage("fr"));
   mount(); await loaded();
   const obsChart = within(card("Observations · 24h")).getByTestId("chart").textContent;
-  expect(obsChart).toContain('"Observations","Paquets uniques"');
+  expect(obsChart).toContain('"legend":{"data":["Observations","Paquets uniques"]');
   const presetChart = within(card("Préréglages radio · historique complet")).getByTestId("chart").textContent;
   expect(presetChart).toContain('"Nœuds","Observateurs"');
   await act(() => i18n.changeLanguage("en"));
 });
+
+it("asks for an empty region by slug rather than falling back to every IATA", async () => {
+  region.iatas = undefined; region.regionKey = "region:empty"; region.emptyRegion = "empty";
+  mount(); await loaded();
+  for (const call of vi.mocked(getStatsSeries).mock.calls) expect(call[2]).toEqual({ region: "empty" });
+  expect(getStatsNodeTypes).toHaveBeenCalledWith({ region: "empty" });
+});
diff --git a/tests/features/stats/ScopesTab.test.tsx b/tests/features/stats/ScopesTab.test.tsx
index b75bcc44..ca555c00 100644
--- a/tests/features/stats/ScopesTab.test.tsx
+++ b/tests/features/stats/ScopesTab.test.tsx
@@ -14,19 +14,19 @@ beforeEach(() => { vi.clearAllMocks(); query.data = originalData; query.isError
 
 it("translates scope counts and membership guidance without changing scope names or values", async () => {
   await act(() => i18n.changeLanguage("fr"));
-  render(<ScopesTab />);
+  render(<ScopesTab range="24h" />);
   expect(screen.queryByRole("heading")).not.toBeInTheDocument();
   const table = screen.getByRole("table", { name: "Effectifs des scopes" });
   expect(within(table).getByRole("row", { name: /#west.*3.*2.*2/ })).toBeInTheDocument();
   expect(within(table).getByRole("row", { name: /#east.*2.*2.*3/ })).toBeInTheDocument();
   expect(screen.getByText("Observateurs par scope")).toBeInTheDocument();
-  expect(screen.getByText(/plusieurs scopes/)).toHaveTextContent("pas limités à une période");
+  expect(screen.getByText(/plusieurs scopes/)).toHaveTextContent("couvrent la période sélectionnée");
   expect(screen.getByText("2 sur 2 scopes")).toBeInTheDocument();
   expect(screen.queryByRole("button", { name: /Actualiser/ })).not.toBeInTheDocument();
 });
 
 it("keeps the current search and chart values when changing language", async () => {
-  render(<ScopesTab />);
+  render(<ScopesTab range="24h" />);
   fireEvent.change(screen.getByRole("searchbox", { name: "Find a scope" }), { target: { value: " EAST " } });
   const charts = () => vi.mocked(EChart).mock.calls.slice(-3).map(([{ option }]) => option);
   const bars = (chart: ReturnType<typeof charts>[number]) => (Array.isArray(chart.series) ? chart.series : [chart.series]).map((series) => series?.data);
@@ -47,7 +47,7 @@ it("keeps the current search and chart values when changing language", async ()
 it.each(["isPending", "isPlaceholderData", "isError"] as const)("translates %s and hides stale regional scopes", async (state) => {
   query[state] = true;
   await act(() => i18n.changeLanguage("fr"));
-  render(<ScopesTab />);
+  render(<ScopesTab range="24h" />);
   expect(screen.queryByRole("table")).not.toBeInTheDocument();
   expect(screen.queryAllByTestId("chart")).toHaveLength(0);
   expect(screen.queryByText("#west")).not.toBeInTheDocument();
@@ -59,26 +59,26 @@ it.each(["isPending", "isPlaceholderData", "isError"] as const)("translates %s a
 
 it("distinguishes a translated empty dataset from a search with no match", async () => {
   await act(() => i18n.changeLanguage("fr"));
-  const { rerender } = render(<ScopesTab />);
+  const { rerender } = render(<ScopesTab range="24h" />);
   const search = screen.getByRole("searchbox", { name: "Rechercher un scope" });
   fireEvent.change(search, { target: { value: "#absent" } });
   expect(screen.getByText("Aucun scope ne correspond à cette recherche.")).toBeInTheDocument();
   expect(screen.getByText("0 sur 2 scopes")).toBeInTheDocument();
   expect(screen.queryByRole("table")).not.toBeInTheDocument();
   fireEvent.change(search, { target: { value: "" } });
-  query.data = []; rerender(<ScopesTab />);
+  query.data = []; rerender(<ScopesTab range="24h" />);
   expect(screen.getByText("Aucune donnée de scope disponible.")).toBeInTheDocument();
   expect(screen.getAllByText("Aucune donnée")).toHaveLength(3);
   expect(screen.queryAllByTestId("chart")).toHaveLength(0);
 });
 
 it("shows exact scope counts, keeps membership semantics explicit and filters the whole view", () => {
-  render(<ScopesTab />);
+  render(<ScopesTab range="24h" />);
   const table = screen.getByRole("table", { name: "Scope counts" });
   expect(within(table).getByRole("row", { name: /#west.*3.*2.*2/ })).toBeInTheDocument();
   expect(screen.getByText("Observers by scope")).toBeInTheDocument();
-  expect(screen.getByRole("button", { name: /An observer can belong/ })).toBeInTheDocument();
-  expect(screen.queryByText(/An observer can belong/, { selector: "p" })).not.toBeInTheDocument();
+  expect(screen.getByRole("button", { name: /an observer can belong/ })).toBeInTheDocument();
+  expect(screen.queryByText(/an observer can belong/, { selector: "p" })).not.toBeInTheDocument();
   expect(screen.getByText(/Scope activity/)).toBeInTheDocument();
   fireEvent.change(screen.getByRole("searchbox", { name: "Find a scope" }), { target: { value: "WEST" } });
   expect(screen.queryByText("#east")).not.toBeInTheDocument();
@@ -88,10 +88,10 @@ it("shows exact scope counts, keeps membership semantics explicit and filters th
 
 it("hides stale values while a region change is pending and on errors", () => {
   query.isPlaceholderData = true;
-  const { rerender } = render(<ScopesTab />);
+  const { rerender } = render(<ScopesTab range="24h" />);
   expect(screen.queryByRole("table")).not.toBeInTheDocument();
   expect(screen.queryAllByTestId("chart")).toHaveLength(0);
-  query.isPlaceholderData = false; query.isError = true; rerender(<ScopesTab />);
+  query.isPlaceholderData = false; query.isError = true; rerender(<ScopesTab range="24h" />);
   expect(screen.getByRole("alert")).toHaveTextContent("Could not load scopes");
   expect(screen.queryByText("#west")).not.toBeInTheDocument();
 });
diff --git a/tests/features/stats/SectionInfo.test.tsx b/tests/features/stats/SectionInfo.test.tsx
index 917e50f4..c7b9520b 100644
--- a/tests/features/stats/SectionInfo.test.tsx
+++ b/tests/features/stats/SectionInfo.test.tsx
@@ -3,7 +3,6 @@ import { render, screen } from "@testing-library/react";
 import { MemoryRouter } from "react-router-dom";
 import { StatsOverview } from "../../../src/features/stats/StatsOverview";
 import { SectionInfo } from "../../../src/features/stats/SectionInfo";
-import type { WsManager } from "../../../src/api/ws-manager";
 
 vi.mock("../../../src/features/stats/ScopesTab", async () => {
   const { SectionInfo } = await import("../../../src/features/stats/SectionInfo");
@@ -11,7 +10,7 @@ vi.mock("../../../src/features/stats/ScopesTab", async () => {
 });
 
 it("shows a section's info beside the section chooser", () => {
-  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=scopes"]}><StatsOverview wsManager={{} as WsManager} /></MemoryRouter>);
+  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=scopes"]}><StatsOverview /></MemoryRouter>);
   const tip = screen.getByRole("button", { name: /About scopes/ });
   expect(tip.closest("[data-section-info]")).toBeInTheDocument();
   expect(screen.getByRole("main")).not.toContainElement(tip);
diff --git a/tests/features/stats/StatsSubHeader.test.tsx b/tests/features/stats/StatsSubHeader.test.tsx
index a1c3c68d..e7f8c5d4 100644
--- a/tests/features/stats/StatsSubHeader.test.tsx
+++ b/tests/features/stats/StatsSubHeader.test.tsx
@@ -19,6 +19,8 @@ describe("translated analytics controls", () => {
     rerender(<StatsSubHeader {...props} tab="traffic" range="7d" />);
     expect(screen.queryByRole("button", { name: "3 j" })).not.toBeInTheDocument();
     expect(screen.getByRole("button", { name: "30 j" })).toBeInTheDocument();
+    rerender(<StatsSubHeader {...props} tab="scopes" range="7d" />);
+    expect(screen.getByRole("button", { name: "30 j" })).toBeInTheDocument();
   });
 
   it("keeps section and range identifiers when labels change", async () => {
diff --git a/tests/features/stats/TalkersTab.test.tsx b/tests/features/stats/TalkersTab.test.tsx
index 0d60f781..c152e9b2 100644
--- a/tests/features/stats/TalkersTab.test.tsx
+++ b/tests/features/stats/TalkersTab.test.tsx
@@ -8,7 +8,7 @@ import type { EChartsOption } from "../../../src/features/stats/echarts-setup";
 import i18n from "../../../src/i18n";
 
 const region = { iatas: ["YVR"], regionKey: "YVR" };
-const advertisers: TopAdvertiser[] = [{ nodeId: "fixture-node", nodeName: "Old advertiser", nodeType: 2, nodeTypeName: "Repeater", iata: "YVR", advertCount: 14, floodAdvertCount: 10, directAdvertCount: 4, lastHeard: 0 }];
+const advertisers: TopAdvertiser[] = [{ nodeId: "fixture-node", publicKey: "aa11bb22cc33dd44", nodeName: "Old advertiser", nodeType: 2, nodeTypeName: "Repeater", iata: "YVR", advertCount: 14, floodAdvertCount: 10, directAdvertCount: 4, lastHeard: 0 }];
 const talkers: TopTalker[] = [{ senderName: "Old sender", messageCount: 42, lastSent: 0 }];
 vi.mock("../../../src/hooks/useRegion", () => ({ useRegion: () => region }));
 vi.mock("../../../src/api/client", () => ({ getTopAdvertisers: vi.fn(), getTopTalkers: vi.fn() }));
@@ -127,6 +127,14 @@ it("opens the clicked advertiser's node", async () => {
   expect(onViewNode).toHaveBeenCalledWith("fixture-node");
 });
 
+it("lists a deleted node by public key without opening it", async () => {
+  vi.mocked(getTopAdvertisers).mockResolvedValue([...advertisers, { ...advertisers[0]!, nodeId: null, publicKey: "deadbeef00112233", nodeName: null }]);
+  const onViewNode = vi.fn();
+  mount(onViewNode);
+  fireEvent.click(await screen.findByText("deadbeef"));
+  expect(onViewNode).not.toHaveBeenCalled();
+});
+
 it("renders the leaderboards in French", async () => {
   await i18n.changeLanguage("fr");
   mount();
diff --git a/tests/features/stats/analytics-navigation.test.tsx b/tests/features/stats/analytics-navigation.test.tsx
index d72d28dc..00f79be7 100644
--- a/tests/features/stats/analytics-navigation.test.tsx
+++ b/tests/features/stats/analytics-navigation.test.tsx
@@ -2,7 +2,6 @@ import { fireEvent, render, screen } from "@testing-library/react";
 import { MemoryRouter, useLocation } from "react-router-dom";
 import { expect, it, vi } from "vitest";
 import { StatsOverview } from "../../../src/features/stats/StatsOverview";
-import type { WsManager } from "../../../src/api/ws-manager";
 
 vi.mock("../../../src/features/stats/TrafficTab", () => ({ TrafficTab: ({ range }: { range: string }) => <p>Traffic range {range}</p> }));
 vi.mock("../../../src/features/stats/SignalTab", () => ({ SignalTab: ({ range }: { range: string }) => <p>Signal range {range}</p> }));
@@ -12,19 +11,19 @@ vi.mock("../../../src/features/stats/ScopesTab", () => ({ ScopesTab: () => <p>Sc
 function Location() { return <output aria-label="Analytics URL">{useLocation().search}</output>; }
 
 it("keeps seven-day links and falls back from retired 3d links", () => {
-  const { unmount } = render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=signal&range=7d"]}><StatsOverview wsManager={{} as WsManager} /></MemoryRouter>);
+  const { unmount } = render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=signal&range=7d"]}><StatsOverview /></MemoryRouter>);
   expect(screen.getByText("Signal range 7d")).toBeInTheDocument();
   expect(screen.getByRole("button", { name: "7d" })).toHaveAttribute("aria-pressed", "true");
   expect(screen.queryByRole("button", { name: "3d" })).not.toBeInTheDocument();
   unmount();
-  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=signal&range=3d"]}><StatsOverview wsManager={{} as WsManager} /></MemoryRouter>);
+  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=signal&range=3d"]}><StatsOverview /></MemoryRouter>);
   expect(screen.getByText("Signal range 7d")).toBeInTheDocument();
   expect(screen.getByRole("button", { name: "30d" })).toBeInTheDocument();
   expect(screen.queryByText(/Hourly analytics keep summaries for up to 30 days/)).not.toBeInTheDocument();
 });
 
 it("opens Paths & Hashes from a shared URL and retains the region while changing range", () => {
-  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=paths&range=24h&iata=YOW"]}><StatsOverview wsManager={{} as WsManager} /><Location /></MemoryRouter>);
+  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=paths&range=24h&iata=YOW"]}><StatsOverview /><Location /></MemoryRouter>);
   expect(screen.getByText("Paths range 24h")).toBeInTheDocument();
   expect(screen.getByRole("button", { name: "Paths & hashes" })).toHaveAttribute("aria-pressed", "true");
   fireEvent.click(screen.getByRole("button", { name: "30d" }));
@@ -33,7 +32,7 @@ it("opens Paths & Hashes from a shared URL and retains the region while changing
 });
 
 it("opens Signal from a shared URL and retains regional state when changing range", () => {
-  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=signal&range=24h&iata=YOW"]}><StatsOverview wsManager={{} as WsManager} /><Location /></MemoryRouter>);
+  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=signal&range=24h&iata=YOW"]}><StatsOverview /><Location /></MemoryRouter>);
   expect(screen.getByText("Signal range 24h")).toBeInTheDocument();
   expect(screen.getByRole("button", { name: "RF / Signal" })).toHaveAttribute("aria-pressed", "true");
   fireEvent.click(screen.getByRole("button", { name: "7d" }));
@@ -42,7 +41,7 @@ it("opens Signal from a shared URL and retains regional state when changing rang
 });
 
 it("opens Traffic from a shared URL and keeps unrelated selections when changing the range", () => {
-  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=traffic&range=24h&observerId=kept"]}><StatsOverview wsManager={{} as WsManager} /><Location /></MemoryRouter>);
+  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=traffic&range=24h&observerId=kept"]}><StatsOverview /><Location /></MemoryRouter>);
   expect(screen.getByText("Traffic range 24h")).toBeInTheDocument();
   expect(screen.getByRole("button", { name: "Traffic" })).toHaveAttribute("aria-pressed", "true");
   fireEvent.click(screen.getByRole("button", { name: "30d" }));
@@ -52,10 +51,10 @@ it("opens Traffic from a shared URL and keeps unrelated selections when changing
   expect(screen.getByText("Mesh charts")).toBeInTheDocument();
 });
 
-it("opens Scopes without a misleading range control and preserves the chosen range for Traffic", () => {
-  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=scopes&range=30d&iata=YOW"]}><StatsOverview wsManager={{} as WsManager} /><Location /></MemoryRouter>);
+it("opens Scopes with the range control and preserves the chosen range for Traffic", () => {
+  render(<MemoryRouter initialEntries={["/?tab=Analytics&statsTab=scopes&range=30d&iata=YOW"]}><StatsOverview /><Location /></MemoryRouter>);
   expect(screen.getByText("Scope charts")).toBeInTheDocument();
-  expect(screen.queryByRole("group", { name: "Time range" })).not.toBeInTheDocument();
+  expect(screen.getByRole("group", { name: "Time range" })).toBeInTheDocument();
   fireEvent.click(screen.getByRole("button", { name: "Traffic" }));
   expect(screen.getByText("Traffic range 30d")).toBeInTheDocument();
   expect(screen.getByLabelText("Analytics URL")).toHaveTextContent("iata=YOW");
diff --git a/tests/features/stats/scope-query.test.tsx b/tests/features/stats/scope-query.test.tsx
index 02b2b0f4..433af777 100644
--- a/tests/features/stats/scope-query.test.tsx
+++ b/tests/features/stats/scope-query.test.tsx
@@ -15,10 +15,10 @@ afterEach(() => { vi.clearAllMocks(); region.iatas = ["YVR"]; region.regionKey =
 
 it("sends the selected IATAs and fetches a separate global query when the filter is cleared", async () => {
   const client = new QueryClient({ defaultOptions: { queries: { retry: false } } });
-  const { rerender, unmount } = renderHook(() => useScopes(), { wrapper: ({ children }: { children: ReactNode }) => <QueryClientProvider client={client}>{children}</QueryClientProvider> });
-  await waitFor(() => expect(getStatsScopes).toHaveBeenCalledWith(["YVR"], expect.any(AbortSignal)));
+  const { rerender, unmount } = renderHook(() => useScopes("7d"), { wrapper: ({ children }: { children: ReactNode }) => <QueryClientProvider client={client}>{children}</QueryClientProvider> });
+  await waitFor(() => expect(getStatsScopes).toHaveBeenCalledWith(["YVR"], expect.any(Number), expect.any(AbortSignal)));
   region.iatas = undefined; region.regionKey = "*"; rerender();
-  await waitFor(() => expect(getStatsScopes).toHaveBeenCalledWith(undefined, expect.any(AbortSignal)));
+  await waitFor(() => expect(getStatsScopes).toHaveBeenCalledWith(undefined, expect.any(Number), expect.any(AbortSignal)));
   expect(client.getQueryCache().findAll({ queryKey: ["stats-scopes"] })).toHaveLength(2);
   unmount(); client.clear();
 });
@@ -26,19 +26,30 @@ it("sends the selected IATAs and fetches a separate global query when the filter
 it("does not fetch a global fallback for unresolved selected regions", () => {
   region.isResolved = false;
   const client = new QueryClient();
-  const { unmount } = renderHook(() => useScopes(), { wrapper: ({ children }: { children: ReactNode }) => <QueryClientProvider client={client}>{children}</QueryClientProvider> });
+  const { unmount } = renderHook(() => useScopes("7d"), { wrapper: ({ children }: { children: ReactNode }) => <QueryClientProvider client={client}>{children}</QueryClientProvider> });
   expect(getStatsScopes).not.toHaveBeenCalled();
   unmount(); client.clear();
 });
 
-it("reuses the regional query without a time-window key when only the language changes", async () => {
+it("reuses the regional query when only the language changes", async () => {
   const client = new QueryClient({ defaultOptions: { queries: { retry: false } } });
-  const { unmount } = render(<QueryClientProvider client={client}><ScopesTab /></QueryClientProvider>);
+  const { unmount } = render(<QueryClientProvider client={client}><ScopesTab range="7d" /></QueryClientProvider>);
   await screen.findByText("No scope data available.");
   expect(getStatsScopes).toHaveBeenCalledOnce();
   await act(() => i18n.changeLanguage("fr"));
   expect(screen.getByText("Aucune donnée de scope disponible.")).toBeInTheDocument();
   expect(getStatsScopes).toHaveBeenCalledOnce();
-  expect(client.getQueryCache().getAll().map((query) => query.queryKey)).toEqual([["stats-scopes", "YVR"]]);
+  expect(client.getQueryCache().getAll().map((query) => query.queryKey)).toEqual([["stats-scopes", "YVR", "7d"]]);
+  unmount(); client.clear();
+});
+
+it("windows scope counts by the selected range", async () => {
+  const client = new QueryClient({ defaultOptions: { queries: { retry: false } } });
+  const before = Date.now();
+  const { unmount } = renderHook(() => useScopes("24h"), { wrapper: ({ children }: { children: ReactNode }) => <QueryClientProvider client={client}>{children}</QueryClientProvider> });
+  await waitFor(() => expect(getStatsScopes).toHaveBeenCalledOnce());
+  const since = vi.mocked(getStatsScopes).mock.calls[0]![1]!;
+  expect(since).toBeGreaterThanOrEqual(before - 24 * 3_600_000);
+  expect(since).toBeLessThanOrEqual(Date.now() - 24 * 3_600_000);
   unmount(); client.clear();
 });
diff --git a/tests/features/stats/series-window.test.ts b/tests/features/stats/series-window.test.ts
new file mode 100644
index 00000000..5809e2fd
--- /dev/null
+++ b/tests/features/stats/series-window.test.ts
@@ -0,0 +1,11 @@
+import { expect, it } from "vitest";
+import { rolledWindow } from "../../../src/features/stats/useStats";
+
+const H = 3_600_000;
+
+it("ends the window at the newest hour the server can have rolled", () => {
+  // the hour starting at H becomes rollable at H + 95 min, matching the server's overview window
+  expect(rolledWindow("24h", 12 * H + 34 * 60_000)).toEqual({ since: -13 * H, until: 11 * H });
+  expect(rolledWindow("24h", 12 * H + 35 * 60_000)).toEqual({ since: -12 * H, until: 12 * H });
+  expect(rolledWindow("7d", 12 * H + 35 * 60_000)).toEqual({ since: 12 * H - 7 * 24 * H, until: 12 * H });
+});
diff --git a/tests/features/stats/useLiveStats.test.tsx b/tests/features/stats/useLiveStats.test.tsx
index 9c0f64b9..c50cced8 100644
--- a/tests/features/stats/useLiveStats.test.tsx
+++ b/tests/features/stats/useLiveStats.test.tsx
@@ -1,90 +1,10 @@
-import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
+import { describe, it, expect } from "vitest";
 import { renderHook } from "@testing-library/react";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import type { ReactNode } from "react";
-import { useLiveOverview, useLiveObserver } from "../../../src/features/stats/useLiveStats";
-import type { StatsOverview } from "../../../src/features/stats/types";
+import { useLiveObserver } from "../../../src/features/stats/useLiveStats";
 import type { WsManager } from "../../../src/api/ws-manager";
-import type { WsObserverStatus, WsPacketObservation } from "../../../src/types/ws";
-
-vi.mock("../../../src/hooks/useRegion", () => ({
-  useRegion: () => ({ iatas: ["YOW"], regionKey: "YOW" }),
-}));
-
-const overview: StatsOverview = {
-  totalPackets: 100,
-  totalObservations: 200,
-  activeObservers: 5,
-  activeIatas: 2,
-  windowHours: 24,
-};
-
-// Captures the packet handler the hook registers and lets the test push events through it.
-function fakeManager() {
-  const handlers: Array<(d: WsPacketObservation["data"]) => void> = [];
-  const manager = {
-    onPacketObservation: (h: (d: WsPacketObservation["data"]) => void) => {
-      handlers.push(h);
-      return () => {};
-    },
-  } as unknown as WsManager;
-  return { manager, emit: (d: WsPacketObservation["data"]) => handlers.forEach((h) => h(d)) };
-}
-
-describe("useLiveOverview", () => {
-  let rafCallbacks: FrameRequestCallback[];
-
-  beforeEach(() => {
-    rafCallbacks = [];
-    vi.stubGlobal("requestAnimationFrame", (cb: FrameRequestCallback) => {
-      rafCallbacks.push(cb);
-      return rafCallbacks.length;
-    });
-    vi.stubGlobal("cancelAnimationFrame", () => {});
-  });
-
-  afterEach(() => {
-    vi.unstubAllGlobals();
-  });
-
-  it("bumps the cached stats-overview counters on packet observations", () => {
-    const qc = new QueryClient();
-    qc.setQueryData<StatsOverview>(["stats-overview", "YOW"], overview);
-    const { manager, emit } = fakeManager();
-
-    const wrapper = ({ children }: { children: ReactNode }) => (
-      <QueryClientProvider client={qc}>{children}</QueryClientProvider>
-    );
-    renderHook(() => useLiveOverview(manager), { wrapper });
-
-    emit({ packet: { isFirstObservation: true } } as WsPacketObservation["data"]);
-    emit({ packet: { isFirstObservation: false } } as WsPacketObservation["data"]);
-    rafCallbacks.forEach((cb) => cb(0)); // flush the coalesced frame
-
-    const after = qc.getQueryData<StatsOverview>(["stats-overview", "YOW"]);
-    expect(after?.totalPackets).toBe(101);
-    expect(after?.totalObservations).toBe(202);
-  });
-
-  it("drops pending deltas instead of resurrecting a failed overview query", () => {
-    const qc = new QueryClient();
-    qc.setQueryData<StatsOverview>(["stats-overview", "YOW"], overview);
-    qc.getQueryCache().find({ queryKey: ["stats-overview", "YOW"] })?.setState({ status: "error", error: new Error("refetch failed") });
-    const { manager, emit } = fakeManager();
-
-    const wrapper = ({ children }: { children: ReactNode }) => (
-      <QueryClientProvider client={qc}>{children}</QueryClientProvider>
-    );
-    renderHook(() => useLiveOverview(manager), { wrapper });
-
-    emit({ packet: { isFirstObservation: true } } as WsPacketObservation["data"]);
-    rafCallbacks.forEach((cb) => cb(0));
-
-    const state = qc.getQueryState<StatsOverview>(["stats-overview", "YOW"]);
-    expect(state?.status).toBe("error");
-    expect(state?.data).toEqual(overview);
-  });
-});
+import type { WsObserverStatus } from "../../../src/types/ws";
 
 describe("useLiveObserver", () => {
   it("refreshes the selected observer's telemetry, but not its heard activity, on a status event", () => {
diff --git a/tests/features/traces/TraceList.test.tsx b/tests/features/traces/TraceList.test.tsx
index efa47378..ae0ded02 100644
--- a/tests/features/traces/TraceList.test.tsx
+++ b/tests/features/traces/TraceList.test.tsx
@@ -175,6 +175,14 @@ describe("TraceList", () => {
     await waitFor(() => expect(mockGetTraces.mock.calls.at(-1)?.[1]).toMatchObject({ type: "PING" }));
   });
 
+  it("explains that the type filter classifies whole tags", async () => {
+    mockGetTraces.mockResolvedValue([]);
+
+    renderTraces();
+
+    expect(await screen.findByText(/TRACE if any packet in the tag is multi-hop/)).toBeInTheDocument();
+  });
+
   it("shows an empty state when there are no traces", async () => {
     mockGetTraces.mockResolvedValue([]);
 
diff --git a/tests/hooks/region-selection.test.ts b/tests/hooks/region-selection.test.ts
index cd94df55..8b66ace5 100644
--- a/tests/hooks/region-selection.test.ts
+++ b/tests/hooks/region-selection.test.ts
@@ -3,6 +3,7 @@ import {
   ALL_REGIONS,
   isAllRegions,
   resolveIatas,
+  emptyRegionSlug,
   regionKey,
   parseSelection,
   selectionToParams,
@@ -14,6 +15,7 @@ import {
 const regionIatas = new Map<string, string[]>([
   ["western-canada", ["YVR", "YYJ"]],
   ["cascadia", ["YVR", "SEA"]], // intentionally overlaps YVR with western-canada
+  ["empty", []],
 ]);
 
 describe("isAllRegions", () => {
@@ -117,3 +119,16 @@ describe("serialize/deserialize", () => {
     expect(deserializeSelection('{"regions":"oops"}')).toEqual(ALL_REGIONS);
   });
 });
+
+describe("emptyRegionSlug", () => {
+  it("names the selected region when it resolves to no IATAs", () => {
+    expect(emptyRegionSlug({ regions: ["empty"], iatas: [] }, regionIatas)).toBe("empty");
+  });
+
+  it("is undefined for all regions, a populated selection, or regions still loading", () => {
+    expect(emptyRegionSlug(ALL_REGIONS, regionIatas)).toBeUndefined();
+    expect(emptyRegionSlug({ regions: ["empty", "cascadia"], iatas: [] }, regionIatas)).toBeUndefined();
+    expect(emptyRegionSlug({ regions: ["empty"], iatas: ["YVR"] }, regionIatas)).toBeUndefined();
+    expect(emptyRegionSlug({ regions: ["empty", "unloaded"], iatas: [] }, regionIatas)).toBeUndefined();
+  });
+});