Merge branch 'main' into sameh/hud-google-lookups

changelog.d/1405-traffic-layer-stale.md

@@ -0,0 +1,3 @@
+- The Traffic layer reads STALE instead of LIVE when the TomTom proxy serves
+  cached flow tiles (budget spent or TomTom failing), and the row dates them by
+  the oldest cached tile (quanticsoul4772, #1405).

docs/CURRENT-STATE.md

@@ -5803,7 +5803,11 @@ easier to meet (detection is now on more often), but does not create it.
   coverage number. `stats.loading` covers outstanding flow work as well as the
   road fetch, so a flow failure landing after the first paint still ends the
   shared loading batch as LOAD FAILED. Harnesses must gate on `!stats.error`,
-  never on `mode === 'live'` alone.
+  never on `mode === 'live'` alone. When the drawn flow came from the proxy's
+  cached STALE-BUDGET / STALE-ERROR tiles, `getStats()` reports `stale: true`
+  and `oldestTileAt`, the row reads STALE with the oldest tile's age, and the
+  sync chip reads
+  `STALE · Roads: <source> · Flow: cached TomTom tiles` instead of LIVE.
 - Traffic runs in `sim` mode (white dots, hardcoded speeds) unless `TOMTOM_API_KEY`
   is configured (env or Keychain `tomtom-api`/`api-key`), which enables `live` mode:
   TomTom flow vector tiles via the budget-governed `/api/tomtom` proxy

src/data/traffic.js

@@ -9,9 +9,18 @@ const sourceSlot = createSourceSlot(
   {
     getFlowSessionStats: () => ({ tilesFetched: 0 }),
     resetFlowTileCache: () => {},
+    // The layer reads stale cached tiles through this; a source without it
+    // answers with fresh segments only.
+    fetchFlowDetail: async (...args) => ({
+      segments: await sourceSlot.source.fetchFlowForBounds(...args),
+      stale: false,
+      oldestTileAt: null,
+    }),
   },
 );
 export const configureTrafficSource = sourceSlot.configure;
+/** The source the traffic layer reads, as configured. */
+export const trafficSource = sourceSlot.source;
 const layer = createApplicationTraffic({
   source: sourceSlot.source,
 });

src/data/traffic.test.mjs

@@ -22,7 +22,10 @@ import { DataLayerManager, layerFeedState } from './manager.js';
 const LIVE_CLAIM = /\bLIVE\b|\bGPS\b|\breal[- ]?time\b/;
 
 test('a superseded flow fetch is not an outage', () => {
-  assert.equal(deriveTrafficFlowError({ name: 'AbortError', message: 'aborted' }), null);
+  assert.equal(
+    deriveTrafficFlowError({ name: 'AbortError', message: 'aborted' }),
+    null,
+  );
   assert.equal(deriveTrafficFlowError(null), null);
   assert.equal(deriveTrafficFlowError(undefined), null);
 });
@@ -30,10 +33,22 @@ test('a superseded flow fetch is not an outage', () => {
 test('flow failures map onto short, specific reasons', () => {
   const reason = (message) => deriveTrafficFlowError(new Error(message));
   assert.equal(reason('flow tile 12/1/1: HTTP 503'), 'TomTom key unavailable');
-  assert.equal(reason('flow tile 12/1/1: HTTP 429'), 'TomTom daily budget reached');
+  assert.equal(
-  assert.equal(reason('flow tile 12/1/1: HTTP 502'), 'TomTom upstream unreachable');
+    reason('flow tile 12/1/1: HTTP 429'),
-  assert.equal(reason('flow tile 12/1/1: HTTP 504'), 'TomTom upstream unreachable');
+    'TomTom daily budget reached',
-  assert.equal(reason('flow tile 12/1/1: HTTP 418'), 'TomTom flow error (HTTP 418)');
+  );
+  assert.equal(
+    reason('flow tile 12/1/1: HTTP 502'),
+    'TomTom upstream unreachable',
+  );
+  assert.equal(
+    reason('flow tile 12/1/1: HTTP 504'),
+    'TomTom upstream unreachable',
+  );
+  assert.equal(
+    reason('flow tile 12/1/1: HTTP 418'),
+    'TomTom flow error (HTTP 418)',
+  );
   assert.equal(reason('flow fetch failed'), 'TomTom flow unavailable');
 });
 
@@ -56,19 +71,32 @@ test('no keyless label ever implies a live feed', () => {
     trafficFeedPresentation({ liveMode: false, fetching: false }),
     trafficFeedPresentation({ liveMode: false, fetching: true }),
     trafficFeedPresentation({ statusUnavailable: true }),
-    trafficFeedPresentation({ liveMode: true, flowError: 'TomTom flow unavailable' }),
+    trafficFeedPresentation({
-    trafficFeedPresentation({ liveMode: true, fetching: true, flowError: 'TomTom flow unavailable' }),
+      liveMode: true,
+      flowError: 'TomTom flow unavailable',
+    }),
+    trafficFeedPresentation({
+      liveMode: true,
+      fetching: true,
+      flowError: 'TomTom flow unavailable',
+    }),
   ].map((feed) => feed.loadingLabel);
   for (const label of labels) {
     assert.ok(!LIVE_CLAIM.test(label), `label implies live data: ${label}`);
-    assert.ok(label.startsWith('SIMULATED'), `fallback label must lead with the mode: ${label}`);
+    assert.ok(
+      label.startsWith('SIMULATED'),
+      `fallback label must lead with the mode: ${label}`,
+    );
   }
 });
 
 test('simulating because the status probe failed reads differently from keyless by design', () => {
   const probeDown = trafficFeedPresentation({ statusUnavailable: true });
   assert.equal(probeDown.mode, 'sim');
-  assert.equal(probeDown.loadingLabel, 'SIMULATED — traffic service unreachable');
+  assert.equal(
+    probeDown.loadingLabel,
+    'SIMULATED — traffic service unreachable',
+  );
 });
 
 test('a healthy keyed layer reports live flow with its real coverage', () => {
@@ -76,7 +104,8 @@ test('a healthy keyed layer reports live flow with its real coverage', () => {
   assert.deepEqual(idle, {
     mode: 'live',
     error: null,
-    loadingLabel: 'LIVE · Roads: OpenStreetMap · Flow: TomTom · 87% cov · Unmatched: simulated',
+    loadingLabel:
+      'LIVE · Roads: OpenStreetMap · Flow: TomTom · 87% cov · Unmatched: simulated',
   });
   assert.equal(
     trafficFeedPresentation({ liveMode: true, fetching: true }).loadingLabel,
@@ -100,7 +129,11 @@ test('a mid-session flow outage degrades instead of reporting stale live coverag
     fetching: true,
     flowError: 'TomTom daily budget reached',
   });
-  assert.deepEqual(busy, down, 'the degraded state reads the same whether or not a load is in flight');
+  assert.deepEqual(
+    busy,
+    down,
+    'the degraded state reads the same whether or not a load is in flight',
+  );
 });
 
 test('the rendered steady-state meta line carries the SIMULATED copy', () => {
@@ -116,10 +149,12 @@ test('the rendered steady-state meta line carries the SIMULATED copy', () => {
   assert.equal(
     mgr._buildMetaText({
       source: 'OpenStreetMap',
-      stats: stats(trafficFeedPresentation({
+      stats: stats(
-        liveMode: true,
+        trafficFeedPresentation({
-        flowError: 'TomTom daily budget reached',
+          liveMode: true,
-      })),
+          flowError: 'TomTom daily budget reached',
+        }),
+      ),
     }),
     'DEGRADED · OpenStreetMap · SIMULATED — TomTom daily budget reached',
   );
@@ -128,17 +163,26 @@ test('the rendered steady-state meta line carries the SIMULATED copy', () => {
 test('the manager reads keyless as FALLBACK and an outage as DEGRADED', () => {
   const settled = { count: 4200, lastUpdate: Date.now() };
   assert.equal(
-    layerFeedState({ ...settled, ...trafficFeedPresentation({ liveMode: false }) }),
+    layerFeedState({
+      ...settled,
+      ...trafficFeedPresentation({ liveMode: false }),
+    }),
     'fallback',
   );
   assert.equal(
-    layerFeedState({ ...settled, ...trafficFeedPresentation({ liveMode: true }) }),
+    layerFeedState({
+      ...settled,
+      ...trafficFeedPresentation({ liveMode: true }),
+    }),
     'nominal',
   );
   assert.equal(
     layerFeedState({
       ...settled,
-      ...trafficFeedPresentation({ liveMode: true, flowError: 'TomTom flow unavailable' }),
+      ...trafficFeedPresentation({
+        liveMode: true,
+        flowError: 'TomTom flow unavailable',
+      }),
     }),
     'degraded',
   );
@@ -148,7 +192,10 @@ test('the shipped layer boots keyless-honest before any status check', () => {
   const stats = trafficLayer.getStats();
   assert.equal(stats.mode, 'sim');
   assert.equal(stats.error, null);
-  assert.ok(!LIVE_CLAIM.test(stats.loadingLabel), `boot label implies live data: ${stats.loadingLabel}`);
+  assert.ok(
+    !LIVE_CLAIM.test(stats.loadingLabel),
+    `boot label implies live data: ${stats.loadingLabel}`,
+  );
   assert.equal(layerFeedState(stats), 'fallback');
 });
 
@@ -167,3 +214,42 @@ test('zero matched dots never claims live coverage', () => {
   assert.match(feed.loadingLabel, /TomTom \(no matches\)/);
   assert.ok(!LIVE_CLAIM.test(feed.loadingLabel));
 });
+
+test('the traffic layer source passes fetchFlowDetail through, so stale tiles reach the layer', async () => {
+  const { trafficSource, configureTrafficSource } =
+    await import('./traffic.js');
+  assert.equal(typeof trafficSource.fetchFlowDetail, 'function');
+  const base = {
+    requestRoads: async () => ({}),
+    getStatus: async () => ({}),
+    fetchFlowForBounds: async () => ['segment'],
+  };
+  let release = configureTrafficSource({
+    ...base,
+    fetchFlowDetail: async () => ({
+      segments: ['segment'],
+      stale: true,
+      oldestTileAt: 1000,
+    }),
+  });
+  try {
+    assert.deepEqual(await trafficSource.fetchFlowDetail({}), {
+      segments: ['segment'],
+      stale: true,
+      oldestTileAt: 1000,
+    });
+  } finally {
+    release();
+  }
+  // A source without fetchFlowDetail answers with fresh segments.
+  release = configureTrafficSource(base);
+  try {
+    assert.deepEqual(await trafficSource.fetchFlowDetail({}), {
+      segments: ['segment'],
+      stale: false,
+      oldestTileAt: null,
+    });
+  } finally {
+    release();
+  }
+});

src/i18n/locales/es.json

@@ -864,6 +864,7 @@
   "LIVE · Roads: {source} · No flow roads in view": "EN VIVO · Vías: {source} · Sin vías con flujo a la vista",
   "LIVE · Roads: {source} · Flow {percent}%": "EN VIVO · Vías: {source} · Flujo {percent}%",
   "SIMULATED · Roads: {source} · Flow {percent}%": "SIMULADO · Vías: {source} · Flujo {percent}%",
+  "STALE · Roads: {source} · Flow: cached TomTom tiles": "DESACTUALIZADO · Vías: {source} · Flujo: teselas de TomTom en caché",
   "Syncing flow · Roads: OpenStreetMap · Flow: TomTom · Unmatched: simulated": "Sincronizando flujo · Vías: OpenStreetMap · Flujo: TomTom · Sin coincidencia: simulado",
   "LIVE · Roads: OpenStreetMap · Flow: TomTom · {percent}% cov · Unmatched: simulated": "EN VIVO · Vías: OpenStreetMap · Flujo: TomTom · {percent}% cob. · Sin coincidencia: simulado",
   "LIVE · Roads: OpenStreetMap · Flow: TomTom · {percent}% cov": "EN VIVO · Vías: OpenStreetMap · Flujo: TomTom · {percent}% cob.",

src/i18n/locales/ru.json

@@ -254,6 +254,7 @@
   "LIVE · Roads: {source} · No flow roads in view": "ОНЛАЙН · Дороги: {source} · В кадре нет дорог с потоком",
   "LIVE · Roads: {source} · Flow {percent}%": "ОНЛАЙН · Дороги: {source} · Поток {percent}%",
   "SIMULATED · Roads: {source} · Flow {percent}%": "СИМУЛЯЦИЯ · Дороги: {source} · Поток {percent}%",
+  "STALE · Roads: {source} · Flow: cached TomTom tiles": "УСТАРЕЛ · Дороги: {source} · Поток: тайлы TomTom из кэша",
   "Syncing flow · Roads: OpenStreetMap · Flow: TomTom · Unmatched: simulated": "Синхронизация потока · Дороги: OpenStreetMap · Поток: TomTom · Без совпадений: симуляция",
   "LIVE · Roads: OpenStreetMap · Flow: TomTom · {percent}% cov · Unmatched: simulated": "ОНЛАЙН · Дороги: OpenStreetMap · Поток: TomTom · охват {percent}% · Без совпадений: симуляция",
   "LIVE · Roads: OpenStreetMap · Flow: TomTom · {percent}% cov": "ОНЛАЙН · Дороги: OpenStreetMap · Поток: TomTom · охват {percent}%",

src/i18n/locales/zh-CN.json

@@ -1059,6 +1059,7 @@
   "LIVE · Roads: {source} · No flow roads in view": "实时 · 道路：{source} · 视野内没有带路况数据的道路",
   "LIVE · Roads: {source} · Flow {percent}%": "实时 · 道路：{source} · 路况 {percent}%",
   "SIMULATED · Roads: {source} · Flow {percent}%": "模拟 · 道路：{source} · 路况 {percent}%",
+  "STALE · Roads: {source} · Flow: cached TomTom tiles": "过期 · 道路：{source} · 路况：TomTom 缓存瓦片",
   "Syncing flow · Roads: OpenStreetMap · Flow: TomTom · Unmatched: simulated": "正在同步路况 · 道路：OpenStreetMap · 路况：TomTom · 未匹配：模拟",
   "LIVE · Roads: OpenStreetMap · Flow: TomTom · {percent}% cov · Unmatched: simulated": "实时 · 道路：OpenStreetMap · 路况：TomTom · 覆盖 {percent}% · 未匹配：模拟",
   "LIVE · Roads: OpenStreetMap · Flow: TomTom · {percent}% cov": "实时 · 道路：OpenStreetMap · 路况：TomTom · 覆盖 {percent}%",

src/i18n/locales/zh-Hant.json

@@ -1054,6 +1054,7 @@
   "LIVE · Roads: {source} · No flow roads in view": "實時 · 道路：{source} · 視野內沒有帶路況數據的道路",
   "LIVE · Roads: {source} · Flow {percent}%": "實時 · 道路：{source} · 路況 {percent}%",
   "SIMULATED · Roads: {source} · Flow {percent}%": "模擬 · 道路：{source} · 路況 {percent}%",
+  "STALE · Roads: {source} · Flow: cached TomTom tiles": "過期 · 道路：{source} · 路況：TomTom 緩存瓦片",
   "Syncing flow · Roads: OpenStreetMap · Flow: TomTom · Unmatched: simulated": "正在同步路況 · 道路：OpenStreetMap · 路況：TomTom · 未匹配：模擬",
   "LIVE · Roads: OpenStreetMap · Flow: TomTom · {percent}% cov · Unmatched: simulated": "實時 · 道路：OpenStreetMap · 路況：TomTom · 覆蓋 {percent}% · 未匹配：模擬",
   "LIVE · Roads: OpenStreetMap · Flow: TomTom · {percent}% cov": "實時 · 道路：OpenStreetMap · 路況：TomTom · 覆蓋 {percent}%",

src/layers/traffic/controls.js

@@ -310,6 +310,7 @@ export function createControls({ state: layerState, services, parts, source }) {
         liveMode: layerState._liveMode,
         fetching: loading,
         flowError: layerState._flowError,
+        stale: layerState._flowStale,
         coveragePct: flowCoveragePct,
         statusUnavailable: layerState._flowStatusUnavailable,
         roadSource: layerState._roadSource,
@@ -321,6 +322,20 @@ export function createControls({ state: layerState, services, parts, source }) {
         lastUpdate: layerState._lastUpdate,
         loading,
         mode: feed.mode,
+        // Cached proxy tiles (TomTom budget spent or upstream failing): the
+        // manager reads this as STALE. Any error (flow, roads, detail) reads
+        // DEGRADED instead.
+        stale: Boolean(
+          layerState._liveMode &&
+          layerState._flowStale &&
+          !(
+            layerState._roadError ||
+            layerState._roadWarning ||
+            layerState._detailError ||
+            feed.error
+          ),
+        ),
+        oldestTileAt: layerState._flowOldestTileAt ?? null,
         error:
           layerState._roadError ||
           layerState._roadWarning ||

src/layers/traffic/flow.js

@@ -186,10 +186,19 @@ export function createFlow({ state: layerState, services, parts, source }) {
       return layerState._warmFlow;
     layerState._warmFlowGeneration = generation;
     const signal = layerState._activeFetchAbort?.signal;
-    layerState._warmFlow = ensureFlowStatus(signal).then(() => {
+    layerState._warmFlow = ensureFlowStatus(signal).then(async () => {
       if (!layerState._liveMode || generation !== layerState._loadGeneration)
         return [];
-      return fetchFlowForBounds(clamped, { signal });
+      if (typeof source.fetchFlowDetail !== 'function')
+        return fetchFlowForBounds(clamped, { signal });
+      // The proxy serves cached tiles once the TomTom budget is spent or the
+      // upstream fails; carry that mark so getStats() reads STALE, not LIVE.
+      const detail = await source.fetchFlowDetail(clamped, { signal });
+      if (generation === layerState._loadGeneration) {
+        layerState._flowStale = detail.stale === true;
+        layerState._flowOldestTileAt = detail.oldestTileAt ?? null;
+      }
+      return detail.segments;
     });
     layerState._warmFlow.catch(() => {});
     return layerState._warmFlow;

src/layers/traffic/lifecycle.js

@@ -42,6 +42,8 @@ export function createLifecycle({
       layerState._lastViewCenter = null;
       layerState._flowRoads = null;
       layerState._flowError = null;
+      layerState._flowStale = false;
+      layerState._flowOldestTileAt = null;
       if (TRAFFIC_TIMING_ENABLED) {
         layerState._trafficTimingCurrentAnchor = null;
         layerState._trafficTimingSequence = 0;
@@ -159,6 +161,8 @@ export function createLifecycle({
       // A stale outage from the last session would misreport a fresh enable —
       // the next load re-derives feed health from real evidence.
       layerState._flowError = null;
+      layerState._flowStale = false;
+      layerState._flowOldestTileAt = null;
 
       layerState._surfaceFrameRemover?.();
       layerState._surfaceFrameRemover = null;

src/layers/traffic/model.js

@@ -229,6 +229,7 @@ export function createModel({ state: layerState, services, parts, source }) {
    * @param {boolean} [input.liveMode] - `/api/tomtom/status` reported a key.
    * @param {boolean} [input.fetching] - A viewport load is in flight.
    * @param {string|null} [input.flowError] - `deriveTrafficFlowError` result, if any.
+   * @param {boolean} [input.stale] - The flow came from cached proxy tiles.
    * @param {number} [input.coveragePct] - Share of shown dots on matched roads, 0–100.
    * @param {boolean} [input.statusUnavailable] - The status probe itself failed.
    * @param {string} [input.roadSource] - Name of the geometry being drawn.
@@ -239,6 +240,7 @@ export function createModel({ state: layerState, services, parts, source }) {
     liveMode = false,
     fetching = false,
     flowError = null,
+    stale = false,
     coveragePct = 0,
     statusUnavailable = false,
     roadSource = 'OpenStreetMap',
@@ -258,6 +260,16 @@ export function createModel({ state: layerState, services, parts, source }) {
       });
       return { mode, error: degraded, loadingLabel: degraded };
     }
+    // Cached proxy tiles (TomTom budget spent or upstream failing) are not live.
+    if (liveMode && stale && !fetching) {
+      return {
+        mode,
+        error: null,
+        loadingLabel: t('STALE · Roads: {source} · Flow: cached TomTom tiles', {
+          source: roadSource,
+        }),
+      };
+    }
     // TomTom and Hybrid name their geometry; OpenStreetMap keeps its match copy.
     if (liveMode && roadSource === 'TomTom') {
       return {

src/layers/traffic/roadModes.test.mjs

@@ -283,6 +283,64 @@ test('flow application preserves direct values and leaves Hybrid fill simulated'
   assert.equal(state._flowPending, 0);
 });
 
+test('stale proxy flow tiles reach the layer stats and never read LIVE', async () => {
+  const { createFlow } = await import('./flow.js');
+  const { createModel } = await import('./model.js');
+  const { createControls } = await import('./controls.js');
+  const { createState } = await import('./state.js');
+  const { layerFeedState } = await import('../../data/feedState.js');
+  let detail = {
+    segments: [flow],
+    partial: false,
+    stale: true,
+    oldestTileAt: 1000,
+  };
+  const source = {
+    fetchFlowDetail: async () => detail,
+    fetchFlowForBounds: async () => detail.segments,
+    getFlowSessionStats: () => ({ tilesFetched: 1 }),
+  };
+  const state = createState({ services: {} });
+  Object.assign(state, {
+    _enabled: true,
+    _liveMode: true,
+    _loadGeneration: 1,
+    _flowStatusPromise: Promise.resolve(),
+    _bucketCounts: { free: 3, slow: 0, jam: 0, sim: 1 },
+  });
+  const parts = {};
+  const context = { state, services: { credits: {} }, parts, source };
+  parts.model = createModel(context);
+  parts.flow = createFlow(context);
+  const controls = createControls(context);
+
+  await parts.flow.applyFlowToRoads([{ coords: coordinates }], box, 1);
+  const stale = controls.methods.getStats();
+  assert.equal(stale.mode, 'live');
+  assert.equal(stale.stale, true);
+  assert.equal(stale.oldestTileAt, 1000);
+  assert.doesNotMatch(stale.loadingLabel, /LIVE/);
+  assert.equal(layerFeedState(stale), 'stale');
+
+  // A road failure outranks cached flow: the row reads the failure.
+  state._roadError = 'Road geometry unavailable';
+  assert.equal(controls.methods.getStats().stale, false);
+  state._roadError = null;
+
+  detail = {
+    segments: [flow],
+    partial: false,
+    stale: false,
+    oldestTileAt: 2000,
+  };
+  state._loadGeneration = 2;
+  await parts.flow.applyFlowToRoads([{ coords: coordinates }], box, 2);
+  const live = controls.methods.getStats();
+  assert.equal(live.stale, false);
+  assert.match(live.loadingLabel, /^LIVE · Roads: OpenStreetMap/);
+  assert.equal(layerFeedState(live), 'nominal');
+});
+
 test('status names the drawn road source for each mode', async () => {
   const { createModel } = await import('./model.js');
   const { trafficFeedPresentation: present } = createModel({

src/layers/traffic/state.js

@@ -108,6 +108,16 @@ export function createState({ services }) {
 
   layerState._flowError = null;
 
+  /**
+   * True while the drawn flow came from cached proxy tiles (TomTom budget
+   * spent or upstream failing); `_flowOldestTileAt` is the oldest tile's
+   * fetch time in ms, or null.
+   * @type {boolean}
+   */
+
+  layerState._flowStale = false;
+  layerState._flowOldestTileAt = null;
+
   /**
    * True when `/api/tomtom/status` itself could not be reached, so the layer is
    * simulating because it could not ask — not because the server said "no key".

src/layers/traffic/viewport.js

@@ -183,6 +183,9 @@ export function createViewport({ state: layerState, services, parts, source }) {
       layerState._fetching = false;
       layerState._flowPending = 0;
       layerState._roadError = null;
+      // Nothing is drawn up here, cached or not.
+      layerState._flowStale = false;
+      layerState._flowOldestTileAt = null;
       parts.animation.clearDots();
       layerState._lastBounds = null;
       layerState._lastViewCenter = null;

src/ui/layerPanel.js

@@ -714,18 +714,24 @@ export class LayerPanel {
       });
     }
     if (feedState === 'stale') {
+      // A layer drawing cached upstream data (Traffic's proxy tiles) dates the
+      // row by the oldest of it, not by the load that re-served it.
+      const dataAgo =
+        Number(stats.oldestTileAt) > 0
+          ? this._timeAgo(stats.oldestTileAt)
+          : ago;
       if (typeof stats.retryInSec === 'number' && stats.retryInSec > 0) {
         return t('{state} · {source} · {ago} · retrying in {seconds}s', {
           state: stateLabel,
           source,
-          ago,
+          ago: dataAgo,
           seconds: stats.retryInSec,
         });
       }
       return t('{state} · {source} · {ago}', {
         state: stateLabel,
         source,
-        ago,
+        ago: dataAgo,
       });
     }
     if (typeof stats.loadingLabel === 'string' && stats.loadingLabel.trim()) {

src/ui/layerPanel.test.mjs

@@ -93,6 +93,27 @@ test('partial feed controls distinguish incomplete records from stale data and o
   assert.equal(button.textContent, 'OFF');
 });
 
+test('a stale row dates cached data by its oldest tile, not the last load', async () => {
+  const { LayerPanel } = await import('./layerPanel.js');
+  const panel = LayerPanel.prototype;
+  const layer = {
+    id: 'traffic',
+    name: 'Street Traffic',
+    source: 'TomTom',
+    enabled: true,
+    stats: {
+      mode: 'live',
+      stale: true,
+      count: 4,
+      lastUpdate: Date.now(),
+      oldestTileAt: Date.now() - 3 * 3600_000,
+    },
+  };
+  assert.match(panel._buildMetaText(layer), /^STALE · TomTom · 3h ago$/);
+  delete layer.stats.oldestTileAt;
+  assert.match(panel._buildMetaText(layer), /^STALE · TomTom · just now$/);
+});
+
 test('readout rows contain only toggles and metadata; ordinary rows retain controls', async () => {
   const { LayerPanel } = await import('./layerPanel.js');
   const { railFixture } = await import('./railTestFixture.mjs');