Let the News panel narrow the window to 12, 6, 3 or 1 hours

The panel's window label becomes a choice of the server's window and each
shorter one. The feed and map filter to it locally; the hotspot counts are
read again for it (/api/news/hotspots?hours=N, now on the allowlist). A
server names the longest window it serves as maxWindowHours.

changelog.d/1-news-layer.md

@@ -1,6 +1,7 @@
 - Add the News layer (Events ▸ News) and its right-rail NEWS panel: the last
-  24 hours from curated hotspots (or the fewer hours a server names, shown in
-  the panel), coloured by severity only, with hotspot
+  24 hours from curated hotspots (or the fewer hours a server names), narrowed
+  in the panel to the last 12, 6, 3 or 1 hours with the hotspot counts read for
+  that window, coloured by severity only, with hotspot
   beacons, outlines with disputed areas, picture cards for major events, an
   "In view" list below 3,000 km and a continuous feed whose cards fly the globe
   to the event. Core serves no news itself: set `GEV_NEWS_ORIGIN` to a news

src/i18n/locales/ar.json

@@ -84,6 +84,7 @@
   "Reading the news…": "جارٍ قراءة الأخبار…",
   "News, last {hours} hours": "الأخبار، آخر {hours} ساعة",
   "Last {hours} h": "آخر {hours} ساعة",
+  "Time window": "الفترة الزمنية",
   "Hotspots": "بؤر ساخنة",
   "Severity": "الخطورة",
   "Category": "الفئة",

src/i18n/locales/de.json

@@ -72,6 +72,7 @@
   "Reading the news…": "Nachrichten werden gelesen…",
   "News, last {hours} hours": "Nachrichten der letzten {hours} Stunden",
   "Last {hours} h": "Letzte {hours} Std.",
+  "Time window": "Zeitraum",
   "Hotspots": "Brennpunkte",
   "Severity": "Schweregrad",
   "Category": "Kategorie",

src/i18n/locales/es.json

@@ -75,6 +75,7 @@
   "Reading the news…": "Leyendo las noticias…",
   "News, last {hours} hours": "Noticias de las últimas {hours} horas",
   "Last {hours} h": "Últimas {hours} h",
+  "Time window": "Periodo",
   "Hotspots": "Focos",
   "Severity": "Gravedad",
   "Category": "Categoría",

src/i18n/locales/fr.json

@@ -75,6 +75,7 @@
   "Reading the news…": "Lecture des actualités…",
   "News, last {hours} hours": "Actualités des dernières {hours} heures",
   "Last {hours} h": "Dernières {hours} h",
+  "Time window": "Période",
   "Hotspots": "Foyers",
   "Severity": "Gravité",
   "Category": "Catégorie",

src/i18n/locales/it.json

@@ -75,6 +75,7 @@
   "Reading the news…": "Lettura delle notizie…",
   "News, last {hours} hours": "Notizie delle ultime {hours} ore",
   "Last {hours} h": "Ultime {hours} h",
+  "Time window": "Periodo",
   "Hotspots": "Focolai",
   "Severity": "Gravità",
   "Category": "Categoria",

src/i18n/locales/ja.json

@@ -69,6 +69,7 @@
   "Reading the news…": "ニュースを読み込み中…",
   "News, last {hours} hours": "直近{hours}時間のニュース",
   "Last {hours} h": "直近{hours}時間",
+  "Time window": "期間",
   "Hotspots": "ホットスポット",
   "Severity": "深刻度",
   "Category": "カテゴリ",

src/i18n/locales/pt.json

@@ -75,6 +75,7 @@
   "Reading the news…": "Lendo as notícias…",
   "News, last {hours} hours": "Notícias das últimas {hours} horas",
   "Last {hours} h": "Últimas {hours} h",
+  "Time window": "Período",
   "Hotspots": "Focos",
   "Severity": "Gravidade",
   "Category": "Categoria",

src/i18n/locales/ru.json

@@ -78,6 +78,7 @@
   "Reading the news…": "Читаем новости…",
   "News, last {hours} hours": "Новости за последние {hours} ч",
   "Last {hours} h": "За {hours} ч",
+  "Time window": "Период",
   "Hotspots": "Горячие точки",
   "Severity": "Тяжесть",
   "Category": "Категория",

src/i18n/locales/uk.json

@@ -78,6 +78,7 @@
   "Reading the news…": "Читаємо новини…",
   "News, last {hours} hours": "Новини за останні {hours} год",
   "Last {hours} h": "За {hours} год",
+  "Time window": "Період",
   "Hotspots": "Гарячі точки",
   "Severity": "Тяжкість",
   "Category": "Категорія",

src/i18n/locales/zh-CN.json

@@ -69,6 +69,7 @@
   "Reading the news…": "正在读取新闻…",
   "News, last {hours} hours": "最近 {hours} 小时的新闻",
   "Last {hours} h": "最近 {hours} 小时",
+  "Time window": "时间范围",
   "Hotspots": "热点",
   "Severity": "严重程度",
   "Category": "类别",

src/i18n/locales/zh-Hant.json

@@ -69,6 +69,7 @@
   "Reading the news…": "正在讀取新聞…",
   "News, last {hours} hours": "最近 {hours} 小時的新聞",
   "Last {hours} h": "最近 {hours} 小時",
+  "Time window": "時間範圍",
   "Hotspots": "熱點",
   "Severity": "嚴重程度",
   "Category": "類別",

src/layers/news/index.js

@@ -45,6 +45,7 @@ import {
   markerStyle,
   mediaLabels,
   mergeFeedPage,
+  newsWindowChoices,
   newsWindowMs,
   normalizeFilters,
   passesFilters,
@@ -142,7 +143,9 @@ export function createNewsLayer({
     autoPages = 0;
   let hotspots = [];
   // The window the server serves (newsWindowMs): a host may serve
-  // fewer hours than the day.
+  // fewer hours than the day. `windowMs` is the one shown: that window, or a
+  // shorter one chosen in the panel (filters.hours).
+  let maxWindowMs = NEWS_WINDOW_MS;
   let windowMs = NEWS_WINDOW_MS;
   let mapReports = [];
   let feed = emptyFeed();
@@ -165,6 +168,11 @@ export function createNewsLayer({
     null;
   const selected = () => (selectedId ? findReport(selectedId) : null);
   const onMap = (report) => visibleOnMap(report, filters, now(), windowMs);
+  const shownWindowMs = () =>
+    Math.min(maxWindowMs, (filters.hours ?? Infinity) * 3_600_000);
+  // The hours to ask the hotspot counts for, when shorter than the server's.
+  const askedHours = () =>
+    windowMs < maxWindowMs ? windowMs / 3_600_000 : undefined;
 
   function markerCartesian(report, pin = 0) {
     const { lat, lon } = reportMarkerPosition(report, pin);
@@ -920,7 +928,9 @@ export function createNewsLayer({
       if (controller.signal.aborted || inViewRequest !== controller) return;
       inView = {
         ...inView,
-        minor: page.reports.filter((r) => withinNewsWindow(r, now(), windowMs)),
+        minor: page.reports.filter((r) =>
+          withinNewsWindow(r, now(), maxWindowMs),
+        ),
         loading: false,
         error: null,
       };
@@ -1045,6 +1055,7 @@ export function createNewsLayer({
       error: error || feed.error ? t(error || feed.error) : null,
       lastRunAt,
       windowHours: windowMs / 3_600_000,
+      windowChoices: newsWindowChoices(maxWindowMs / 3_600_000),
     };
   }
 
@@ -1139,7 +1150,10 @@ export function createNewsLayer({
       notify();
       try {
         const [index, todays] = await Promise.all([
-          source.getHotspots({ signal: controller.signal }),
+          source.getHotspots({
+            signal: controller.signal,
+            hours: askedHours(),
+          }),
           source.getFeed(
             {
               hotspot: 'all',
@@ -1157,9 +1171,16 @@ export function createNewsLayer({
         hotspots = index.hotspots;
         loadOutlines();
         lastRunAt = index.lastRunAt;
-        windowMs = newsWindowMs(index.windowHours);
+        // A server that names no limit serves the window its counts cover
+        // when asked for none.
+        maxWindowMs = newsWindowMs(
+          index.maxWindowHours ??
+            (askedHours() ? maxWindowMs / 3_600_000 : index.windowHours),
+        );
+        windowMs = shownWindowMs();
+        // Kept for the server's whole window, so a longer choice needs no read.
         mapReports = todays.reports.filter((r) =>
-          withinNewsWindow(r, now(), windowMs),
+          withinNewsWindow(r, now(), maxWindowMs),
         );
         filters = normalizeFilters({}, hotspots, filters);
         error = null;
@@ -1196,6 +1217,8 @@ export function createNewsLayer({
         const reread = readKey(next) !== readKey(filters);
         const minorChanged = next.includeMinor !== filters.includeMinor;
         filters = next;
+        const previousWindowMs = windowMs;
+        windowMs = shownWindowMs();
         if (
           Object.hasOwn(params.filters, 'hotspot') &&
           next.hotspot !== 'all'
@@ -1208,6 +1231,8 @@ export function createNewsLayer({
         render();
         if (reread) void loadFeed('replace');
         if (minorChanged) void refreshInView({ force: true });
+        // The hotspot counts are the server's, so a new window reads them again.
+        if (windowMs !== previousWindowMs) void layer.update(viewer);
         notify();
       }
       if (params.loadMore === true) void loadFeed('append');

src/layers/news/layer.test.mjs

@@ -275,6 +275,53 @@ test('In view with minor news reads once, not per pan; a failed read shows', asy
   assert.deepEqual(view.items, []);
 });
 
+test('a shorter window narrows the feed and reads the hotspot counts for it', async (t) => {
+  const asked = [];
+  const { layer } = fixture(t, {
+    source: {
+      getHotspots: async ({ hours } = {}) => {
+        asked.push(hours);
+        return {
+          ...hotspotsPayload,
+          windowHours: hours ?? 12,
+          maxWindowHours: 12,
+        };
+      },
+      getFeed: async () => ({
+        reports: [
+          report('recent', { publishedAt: '2026-10-28T09:30:00.000Z' }),
+          report('earlier', { publishedAt: '2026-10-28T05:00:00.000Z' }),
+        ],
+        nextBefore: null,
+      }),
+    },
+  });
+  layer.enable();
+  await layer.update();
+  await settle();
+  let view = layer.getRowControls().feed;
+  assert.deepEqual(view.windowChoices, [12, 6, 3, 1]);
+  assert.equal(view.windowHours, 12);
+  assert.deepEqual(
+    view.items.map((item) => item.id),
+    ['recent', 'earlier'],
+  );
+  layer.setParams({ filters: { hours: 3 } });
+  view = layer.getRowControls().feed;
+  assert.equal(view.windowHours, 3);
+  assert.deepEqual(
+    view.items.map((item) => item.id),
+    ['recent'],
+  );
+  for (let i = 0; i < 3; i++) await settle();
+  assert.deepEqual(asked, [undefined, 3]);
+  // The server's own window still bounds the choices.
+  assert.deepEqual(layer.getRowControls().feed.windowChoices, [12, 6, 3, 1]);
+  // A choice longer than the server serves shows all it serves.
+  layer.setParams({ filters: { hours: 24 } });
+  assert.equal(layer.getRowControls().feed.windowHours, 12);
+});
+
 test('a server without news is unavailable once and is not asked again', async (t) => {
   const failure = Object.assign(
     new Error('News feed not configured on this server'),

src/layers/news/model.js

@@ -21,6 +21,18 @@ export function newsWindowMs(hours) {
     ? hours * 3_600_000
     : NEWS_WINDOW_MS;
 }
+
+/** The windows the News panel offers, longest first. */
+export const NEWS_WINDOW_CHOICES = Object.freeze([24, 12, 6, 3, 1]);
+
+/**
+ * The windows offered under a server's own window of `maxHours`: that window
+ * itself, then each shorter choice.
+ */
+export function newsWindowChoices(maxHours) {
+  const cap = newsWindowMs(maxHours) / 3_600_000;
+  return [cap, ...NEWS_WINDOW_CHOICES.filter((hours) => hours < cap)];
+}
 // A publish time this far ahead of the clock is skew, not a future story
 // (as data/regionalNewsWindow.js).
 const NEWS_CLOCK_SKEW_MS = 15 * 60_000;
@@ -616,6 +628,8 @@ export function normalizeFilters(next = {}, hotspots = [], previous = {}) {
     includeMinor: merged.includeMinor === true,
     // Event cards on the map; off leaves only the clicked event's card.
     cards: merged.cards !== false,
+    // A shorter window than the server's; null shows all it serves.
+    hours: NEWS_WINDOW_CHOICES.includes(merged.hours) ? merged.hours : null,
   };
 }
 

src/layers/news/model.test.mjs

@@ -20,6 +20,7 @@ import {
   isPressing,
   markerStyle,
   mergeFeedPage,
+  newsWindowChoices,
   newsWindowMs,
   normalizeFilters,
   passesFilters,
@@ -287,8 +288,11 @@ test('filters default to significant news and map to a last-24-hours query', ()
     minSeverity: 2,
     includeMinor: false,
     cards: true,
+    hours: null,
   });
   assert.equal(normalizeFilters({ cards: false }, hotspots).cards, false);
+  assert.equal(normalizeFilters({ hours: 6 }, hotspots).hours, 6);
+  assert.equal(normalizeFilters({ hours: 5 }, hotspots).hours, null);
   assert.equal(normalizeFilters({ minSeverity: 0 }, hotspots).minSeverity, 0);
   assert.equal(normalizeFilters({ hotspot: 'gone' }, hotspots).hotspot, 'all');
   assert.equal(
@@ -599,6 +603,21 @@ test('the hotspots answer carries the window it was counted over', () => {
     normalizeHotspotsPayload({ ...base, windowHours: 48 }).windowHours,
     null,
   );
+  const shorter = normalizeHotspotsPayload({
+    ...base,
+    windowHours: 3,
+    maxWindowHours: 12,
+  });
+  assert.deepEqual([shorter.windowHours, shorter.maxWindowHours], [3, 12]);
+  assert.equal(normalizeHotspotsPayload(base).maxWindowHours, null);
+});
+
+test('the window choices stop at the window the server serves', () => {
+  assert.deepEqual(newsWindowChoices(24), [24, 12, 6, 3, 1]);
+  assert.deepEqual(newsWindowChoices(12), [12, 6, 3, 1]);
+  assert.deepEqual(newsWindowChoices(8), [8, 6, 3, 1]);
+  assert.deepEqual(newsWindowChoices(1), [1]);
+  assert.deepEqual(newsWindowChoices(null), [24, 12, 6, 3, 1]);
 });
 
 test('a checked severity keeps saying who set it', () => {

src/layers/news/records.js

@@ -95,10 +95,15 @@ function normalizeDeveloping(items) {
   return out;
 }
 
+const hoursOrNull = (hours) =>
+  Number.isInteger(hours) && hours >= 1 && hours <= 24 ? hours : null;
+
 /**
- * `/api/news/hotspots` → `{hotspots, categories, lastRunAt, windowHours}`
- * (`windowHours` null when the server names none), or null when the
- * payload has no hotspot list.
+ * `/api/news/hotspots` → `{hotspots, categories, lastRunAt, windowHours,
+ * maxWindowHours}`, or null when the payload has no hotspot list.
+ * `windowHours` is the window the counts cover and `maxWindowHours` the
+ * longest the server serves this reader; each is null when the server names
+ * none.
  */
 export function normalizeHotspotsPayload(payload) {
   if (!Array.isArray(payload?.hotspots)) return null;
@@ -136,12 +141,8 @@ export function normalizeHotspotsPayload(payload) {
         )
       : [],
     lastRunAt: iso(payload.ingest?.lastRunAt),
-    windowHours:
-      Number.isInteger(payload.windowHours) &&
-      payload.windowHours >= 1 &&
-      payload.windowHours <= 24
-        ? payload.windowHours
-        : null,
+    windowHours: hoursOrNull(payload.windowHours),
+    maxWindowHours: hoursOrNull(payload.maxWindowHours),
   };
 }
 

src/layers/news/source.js

@@ -63,7 +63,15 @@ export function newsFeedQuery(query = {}) {
 export function newsQueryAllowed(url) {
   const params = [...url.searchParams];
   if (new Set(params.map(([key]) => key)).size !== params.length) return false;
-  if (url.pathname === `${BASE_PATH}/hotspots`) return params.length === 0;
+  if (url.pathname === `${BASE_PATH}/hotspots`)
+    return (
+      params.length === 0 ||
+      (params.length === 1 &&
+        params[0][0] === 'hours' &&
+        /^\d{1,2}$/.test(params[0][1]) &&
+        Number(params[0][1]) >= 1 &&
+        Number(params[0][1]) <= 24)
+    );
   if (url.pathname === `${BASE_PATH}/outline`) {
     const keys = params.map(([key]) => key).sort();
     const value = url.searchParams;
@@ -128,9 +136,12 @@ export function createNewsSource({
     return readResponseJsonCapped(response, MAX_BYTES, request);
   }
   return {
-    async getHotspots({ signal } = {}) {
+    // `hours` asks for counts over a shorter window than the server's own.
+    async getHotspots({ signal, hours } = {}) {
       const payload = normalizeHotspotsPayload(
-        await get('/hotspots', { signal }),
+        await get(hours ? `/hotspots?hours=${hours}` : '/hotspots', {
+          signal,
+        }),
       );
       if (!payload) throw new Error(msg('Malformed news hotspots response'));
       return payload;

src/layers/news/source.test.mjs

@@ -53,6 +53,7 @@ test('reads validated hotspots, feed and outlines from the same-origin routes',
   );
   assert.deepEqual((await source.getOutline('ua')).polygons, []);
   await source.getCountryOutline('SD');
+  await source.getHotspots({ hours: 6 });
   assert.deepEqual(
     calls.map((c) => c.url),
     [
@@ -60,6 +61,7 @@ test('reads validated hotspots, feed and outlines from the same-origin routes',
       '/api/news/feed?hotspot=all&limit=60&today=1',
       '/api/news/outline?hotspot=ua&v=4',
       '/api/news/outline?country=SD&v=4',
+      '/api/news/hotspots?hours=6',
     ],
   );
   for (const { url, init } of calls) {
@@ -155,7 +157,12 @@ test('the host allowlist admits the client routes and refuses anything else', ()
     ),
     true,
   );
+  assert.equal(allowed('/api/news/hotspots?hours=6'), true);
   for (const path of [
+    '/api/news/hotspots?hours=0',
+    '/api/news/hotspots?hours=25',
+    '/api/news/hotspots?hours=6&hours=3',
+    '/api/news/hotspots?hours=6&x=1',
     '/api/news/hotspots?x=1',
     '/api/news/feed?limit=501',
     '/api/news/feed?limit=0',

src/ui/news/NewsFeed.vue

@@ -8,7 +8,8 @@ import RailChips from '../rail/RailChips.vue';
 import NewsCard from './NewsCard.vue';
 
 // The News panel: the window the server serves only (the last 24 hours, or
-// fewer where the host serves less). Hotspot chips, filters, the chosen
+// fewer where the host serves less), or a shorter one chosen at the
+// top (24/12/6/3/1 h). Hotspot chips, filters, the chosen
 // event, "In view" (reports near the view centre while the camera is low)
 // and a continuous feed, newest first. It renders the `feed` view the news
 // layer publishes and acts only through `onParams`.
@@ -44,6 +45,15 @@ const categoryOptions = computed(() => [
   { value: 'all', label: t('All categories') },
   ...(props.view?.categories ?? []),
 ]);
+const windowOptions = computed(() =>
+  (props.view?.windowChoices ?? []).map((hours) => ({
+    value: String(hours),
+    label: t('Last {hours} h', { hours }),
+  })),
+);
+// The longest choice is the server's whole window, kept as no choice.
+const chooseWindow = (hours) =>
+  setFilter('hours', hours === props.view?.windowChoices?.[0] ? null : hours);
 const selectedId = computed(() => props.view?.selected?.id ?? null);
 // The chosen event leads the panel unless the feed already shows it open.
 const selectedApart = computed(() => {
@@ -78,7 +88,15 @@ const clear = () => props.onParams({ clear: true });
     class="news-readout"
     :aria-label="t('News, last {hours} hours', { hours: view.windowHours })"
   >
-    <p class="news-readout__window ui-mono">{{
+    <UiSelect
+      v-if="windowOptions.length > 1"
+      class="gev-field news-filter news-readout__window-choice"
+      :aria-label="t('Time window')"
+      :model-value="String(view.windowHours)"
+      :options="windowOptions"
+      @update:model-value="chooseWindow(Number($event))"
+    />
+    <p v-else class="news-readout__window ui-mono">{{
       t('Last {hours} h', { hours: view.windowHours })
     }}</p>
     <div class="news-readout__chips" role="group" :aria-label="t('Hotspots')">

src/ui/newsPanel.test.mjs

@@ -278,6 +278,24 @@ test('scrolling to the end asks once per page, again after a filter change or a
   news.destroy();
 });
 
+test('the window choice offers shorter windows; the longest is the server window', () => {
+  const { news, panel, calls } = fixture();
+  news.update(view({ windowHours: 12, windowChoices: [12, 6, 3, 1] }));
+  assert.equal(panel.querySelector('.news-readout__window'), null);
+  const choice = panel.querySelector('select[aria-label="Time window"]');
+  assert.deepEqual(
+    [...choice.options].map((option) => option.textContent),
+    ['Last 12 h', 'Last 6 h', 'Last 3 h', 'Last 1 h'],
+  );
+  assert.equal(choice.value, '12');
+  choice.value = '3';
+  choice.dispatchEvent(new Event('change'));
+  assert.deepEqual(calls.at(-1)[1], { filters: { hours: 3 } });
+  choice.value = '12';
+  choice.dispatchEvent(new Event('change'));
+  assert.deepEqual(calls.at(-1)[1], { filters: { hours: null } });
+});
+
 test('the panel names the window the server serves', () => {
   const { news, panel } = fixture();
   news.update(view({ windowHours: 12 }));

src/ui/styles/news.css

@@ -131,6 +131,11 @@
 .news-filter {
   min-width: 0;
 }
+/* The window choice sits where the window label does, as narrow as its text. */
+.news-readout__window-choice {
+  align-self: flex-start;
+  font-family: var(--font-mono);
+}
 .news-toggle {
   display: flex;
   align-items: center;