拆分图表实时观测兜底

frontend/app/api/city/[name]/observation/route.ts

@@ -0,0 +1,32 @@
+import { NextRequest, NextResponse } from "next/server";
+import { proxyBackendJsonGet } from "@/lib/api-proxy";
+import { NO_STORE_CACHE_CONTROL } from "@/lib/proxy-cache-policy";
+
+const API_BASE = process.env.POLYWEATHER_API_BASE_URL;
+
+export async function GET(
+  req: NextRequest,
+  context: { params: Promise<{ name: string }> },
+) {
+  if (!API_BASE) {
+    return NextResponse.json(
+      { error: "POLYWEATHER_API_BASE_URL is not configured" },
+      {
+        headers: {
+          "Cache-Control": NO_STORE_CACHE_CONTROL,
+          "Cloudflare-CDN-Cache-Control": NO_STORE_CACHE_CONTROL,
+        },
+        status: 500,
+      },
+    );
+  }
+
+  const { name } = await context.params;
+  return proxyBackendJsonGet(req, {
+    cacheControl: NO_STORE_CACHE_CONTROL,
+    fetchCache: "no-store",
+    includeSupabaseIdentity: false,
+    publicMessage: "Failed to fetch live city observation",
+    url: `${API_BASE}/api/city/${encodeURIComponent(name)}/observation`,
+  });
+}

frontend/components/dashboard/scan-terminal/LiveTemperatureThresholdChart.tsx

@@ -20,6 +20,7 @@ import {
   buildIntDegreeTicks,
   buildRunwayPlates,
   fetchHourlyForecastForCity,
+  fetchLiveObservationForCity,
   getActiveTemperatureSeries,
   getDebPeakWindowRange,
   getPeakGlowState,
@@ -28,6 +29,7 @@ import {
   getVisibleTemperatureSeries,
   isTemperatureSeriesVisibleByDefault,
   mergeHourlyWithLiveObservations,
+  mergeObservationPayloadIntoHourly,
   mergePatchIntoHourly,
   mergeRowObservationIntoHourly,
   normObs,
@@ -65,7 +67,7 @@ const PEAK_GLOW_BADGE_CLASS = {
 
 const PROBABILITY_REFRESH_AFTER_PATCH_MS = DASHBOARD_REFRESH_POLICY_MS.metar;
 const FOREGROUND_FULL_DETAIL_REFRESH_DEDUP_MS = 90_000;
-const NO_PATCH_CACHED_DETAIL_REFRESH_MS = DASHBOARD_REFRESH_POLICY_MS.observation;
+const LIVE_OBSERVATION_FALLBACK_MS = DASHBOARD_REFRESH_POLICY_MS.liveObservationFallback;
 const DETAIL_LOAD_BATCH_DELAY_MS = 0;
 const TRANSIENT_DETAIL_RETRY_DELAY_MS = 3_000;
 const INITIAL_DETAIL_LOAD_SLOTS = 3;
@@ -252,6 +254,11 @@ function rowObservationTimeForFreshness(row: ScanOpportunityRow | null) {
   ).trim() || null;
 }
 
+function observationPayloadTimeForFreshness(payload: any) {
+  const block = payload?.airport_current || payload?.airport_primary || payload?.current || {};
+  return String(block.obs_time || block.observed_at || block.observation_time || payload?.local_time || "").trim() || null;
+}
+
 function patchObservationTimeForFreshness(patch: { changes?: Record<string, unknown> } | null | undefined) {
   const changes = patch?.changes || {};
   return String(
@@ -848,6 +855,28 @@ export function LiveTemperatureThresholdChart({
     applySuccessfulHourlyDetail,
   });
 
+  const applyLiveObservationPayload = useCallback((payload: any) => {
+    if (!payload || typeof payload !== "object") return;
+    const appliedAtMs = Date.now();
+    const condition = payload.airport_current || payload.airport_primary || payload.current || {};
+    const temp = validNumber(condition.temp);
+    if (temp !== null) setLiveTemp(temp);
+    if (typeof payload.local_date === "string" && payload.local_date) {
+      setCurrentCityLocalDate(payload.local_date);
+    }
+    commitHourlySnapshot((prev) =>
+      mergeObservationPayloadIntoHourly(
+        prev ?? seedHourlyForecastFromRow(getLatestRowSnapshot()),
+        payload,
+      ),
+    );
+    setChartFreshness((prev) => ({
+      ...prev,
+      rowAppliedAtMs: appliedAtMs,
+      rowObservationTime: observationPayloadTimeForFreshness(payload),
+    }));
+  }, [commitHourlySnapshot, getLatestRowSnapshot]);
+
   useEffect(() => {
     if (!city || !currentRowObservationSignature) return;
     if (lastRowObservationSignatureRef.current === currentRowObservationSignature) return;
@@ -1036,37 +1065,35 @@ export function LiveTemperatureThresholdChart({
     };
   }, [resyncVersion, city, runHourlyDetailFetch]);
 
-  // ── SSE fallback: visible charts refresh cached detail at observation cadence if patches stop. ──
+  // ── SSE fallback: visible charts merge no-store observations if patches stop. ──
   useEffect(() => {
     if (!shouldPollLiveChart({ city, compact, isActive, isMaximized })) return;
     let cancelled = false;
 
-    const refreshCachedDetail = () => {
+    const refreshLiveObservation = () => {
       const now = Date.now();
       lastPatchAtRef.current = now;
 
-      void runHourlyDetailFetch({
+      void fetchLiveObservationForCity(city).then((payload) => {
-        source: "network",
+        if (cancelled || !payload) return;
-        fetchOptions: { bypassLocalCache: true },
+        applyLiveObservationPayload(payload);
-        applyOptions: { updateLiveTemp: true },
-        isCancelled: () => cancelled,
-        onSettled: () => setIsHourlyLoading(false),
       });
     };
 
     const checkFallback = () => {
       if (typeof document !== "undefined" && document.visibilityState === "hidden") return;
-      if (Date.now() - lastPatchAtRef.current < NO_PATCH_CACHED_DETAIL_REFRESH_MS) return;
+      if (Date.now() - lastPatchAtRef.current < LIVE_OBSERVATION_FALLBACK_MS) return;
 
-      refreshCachedDetail();
+      refreshLiveObservation();
     };
 
+    refreshLiveObservation();
     const id = setInterval(checkFallback, 60_000);
     return () => {
       cancelled = true;
       clearInterval(id);
     };
-  }, [city, compact, isActive, isMaximized, targetResolution, runHourlyDetailFetch]);
+  }, [city, compact, isActive, isMaximized, applyLiveObservationPayload]);
 
   useEffect(() => {
     if (!activationRefreshKey) return;

frontend/components/dashboard/scan-terminal/__tests__/refreshCadencePolicy.test.ts

@@ -36,6 +36,7 @@ async function flushMicrotasks() {
 
 export async function runTests() {
   assert(DASHBOARD_REFRESH_POLICY_MS.observation === 60_000, "observation layer should refresh every 60 seconds");
+  assert(DASHBOARD_REFRESH_POLICY_MS.liveObservationFallback === 3 * 60_000, "chart observation fallback should poll every 180 seconds when SSE is unavailable");
   assert(DASHBOARD_REFRESH_POLICY_MS.scanRows === 2 * 60_000, "region/city rows should refresh every 2 minutes");
   assert(DASHBOARD_REFRESH_POLICY_MS.marketOverview === 10 * 60_000, "market overview should refresh every 10 minutes");
   assert(DASHBOARD_REFRESH_POLICY_MS.model === 30 * 60_000, "DEB and multi-model data should refresh every 30 minutes");
@@ -86,19 +87,21 @@ export async function runTests() {
     "selected city chart should consume SSE patches and keep METAR cadence for heavy probability refreshes instead of a 2-minute forced refresh",
   );
   assert(
-    chartSource.includes("NO_PATCH_CACHED_DETAIL_REFRESH_MS = DASHBOARD_REFRESH_POLICY_MS.observation") &&
+    chartSource.includes("LIVE_OBSERVATION_FALLBACK_MS = DASHBOARD_REFRESH_POLICY_MS.liveObservationFallback") &&
-      chartSource.includes("refreshCachedDetail") &&
+      chartSource.includes("refreshLiveObservation") &&
-      chartSource.includes("runHourlyDetailFetch") &&
+      chartSource.includes("fetchLiveObservationForCity") &&
-      chartSource.includes("fetchOptions: { bypassLocalCache: true }") &&
+      chartSource.includes("mergeObservationPayloadIntoHourly") &&
       chartLogicSource.includes("options.bypassLocalCache") &&
       chartLogicSource.includes("const forceRefresh = Boolean(options.ignoreCache)"),
-    "visible charts should bypass the five-minute browser detail cache every observation cadence without force-refreshing backend sources",
+    "visible charts should use the no-store observation endpoint for 180-second SSE fallback without forcing detail-batch refreshes",
   );
   const componentHourlyFetchCalls = chartSource.match(/fetchHourlyForecastForCity\(city,/g) || [];
+  const hourlyFetcherBlock =
+    /function useHourlyDetailFetcher\([\s\S]*?\n}\r?\n\r?\n\/\/ 岸岸 Main component/.exec(chartSource)?.[0] || "";
   assert(
     chartSource.includes("function useHourlyDetailFetcher") &&
       componentHourlyFetchCalls.length === 1 &&
-      !/fetchHourlyForecastForCity\(city,[\s\S]*?\)\s*\.then\(/.test(chartSource),
+      !/fetchHourlyForecastForCity\(city,[\s\S]*?\)\s*\.then\(/.test(hourlyFetcherBlock),
     "temperature chart should centralize full-detail fetch lifecycle in useHourlyDetailFetcher instead of duplicating then/catch branches across effects",
   );
   assert(
@@ -159,7 +162,13 @@ export async function runTests() {
   assert(
     chartLogicSource.includes("forceRefresh: boolean") &&
       chartLogicSource.includes('force_refresh: forceRefresh ? "true" : "false"'),
-    "ignoreCache chart detail refreshes must send force_refresh=true so fresh METAR observations bypass proxy and backend chart caches",
+    "ignoreCache chart detail refreshes must send force_refresh=true only for heavy model/detail resyncs, not the 180-second observation fallback",
+  );
+  assert(
+    chartLogicSource.includes("/api/city/${encodeURIComponent(city)}/observation") &&
+      chartLogicSource.includes('cache: "no-store"') &&
+      chartLogicSource.includes("mergeObservationPayloadIntoHourly"),
+    "live observation fetches must call the no-store per-city observation endpoint and merge without touching cached model detail",
   );
   assert(
     chartLogicSource.includes("cityDetailBatchQueueKey") &&

frontend/components/dashboard/scan-terminal/__tests__/ssePatchArchitecture.test.ts

@@ -197,8 +197,8 @@ export function runTests() {
     "temperature chart must keep METAR cadence for heavy patch-triggered probability refreshes",
   );
   assert(
-    chart.includes("NO_PATCH_CACHED_DETAIL_REFRESH_MS = DASHBOARD_REFRESH_POLICY_MS.observation"),
+    chart.includes("LIVE_OBSERVATION_FALLBACK_MS = DASHBOARD_REFRESH_POLICY_MS.liveObservationFallback"),
-    "temperature chart must use observation cadence for lightweight cached no-patch refreshes",
+    "temperature chart must use the 180-second observation fallback cadence when SSE patches stop",
   );
   assert(chart.includes("TemperatureChartCanvas"), "temperature chart shell must compose the extracted chart canvas");
   assert(chart.includes("TemperatureStatsBars"), "temperature chart shell must compose the extracted stat bars");
@@ -229,13 +229,15 @@ export function runTests() {
     chart.includes("ignoreCache: true") && chart.includes("currentCityLocalDate !== loadedLocalDate"),
     "temperature chart must background-refresh full city detail when the city-local day rolls over",
   );
-  const fallbackRefreshBlock = chart.match(/const refreshCachedDetail = \(\) => \{[\s\S]*?\n    \};/)?.[0] || "";
+  const fallbackRefreshBlock = chart.match(/const refreshLiveObservation = \(\) => \{[\s\S]*?\n    \};/)?.[0] || "";
   assert(
-    fallbackRefreshBlock.includes("runHourlyDetailFetch") &&
+    fallbackRefreshBlock.includes("fetchLiveObservationForCity") &&
-      fallbackRefreshBlock.includes("fetchOptions: { bypassLocalCache: true }") &&
+      fallbackRefreshBlock.includes("applyLiveObservationPayload") &&
+      chart.includes("mergeObservationPayloadIntoHourly") &&
+      !fallbackRefreshBlock.includes("runHourlyDetailFetch") &&
       !fallbackRefreshBlock.includes("ignoreCache: true") &&
       !fallbackRefreshBlock.includes("setIsHourlyLoading(true)"),
-    "no-patch fallback refresh should revalidate through cached backend detail without force-refreshing sources or showing the loading overlay",
+    "no-patch fallback refresh should merge no-store observation data without refreshing cached detail-batch or showing the loading overlay",
   );
   const resyncBlock = chart.match(/useEffect\(\(\) => \{\s*if \(!resyncVersion \|\| !city\) return;[\s\S]*?\}, \[resyncVersion, city, runHourlyDetailFetch\]\);/)?.[0] || "";
   assert(

frontend/components/dashboard/scan-terminal/__tests__/temperatureChartData.test.ts

@@ -3,6 +3,7 @@ import type { CityDetail } from "@/lib/dashboard-types";
 import { buildChartTimeAxis, buildDebBaselinePath } from "@/lib/temperature-chart-paths";
 import {
   buildFullDayChartData,
+  mergeObservationPayloadIntoHourly,
   mergeHourlyWithLiveObservations,
   mergePatchIntoHourly,
   mergeRowObservationIntoHourly,
@@ -835,6 +836,53 @@ export function runTests() {
     "instant-restore cache must include live-merged runway history so returning to terminal shows it immediately",
   );
 
+  const observationOnlyPayload = {
+    city: "chengdu",
+    local_date: "2026-06-15",
+    local_time: "17:45",
+    airport_current: {
+      temp: 27.1,
+      obs_time: "2026-06-15T17:45:00+08:00",
+      source_code: "amsc_awos",
+      source_label: "AMSC AWOS",
+    },
+    airport_primary: {
+      temp: 27.1,
+      obs_time: "2026-06-15T17:45:00+08:00",
+      source_code: "amsc_awos",
+      source_label: "AMSC AWOS",
+    },
+    metar_today_obs: [
+      {
+        time: "17:45",
+        temp: 27.1,
+        obs_time: "2026-06-15T17:45:00+08:00",
+        source_code: "amsc_awos",
+      },
+    ],
+    runway_plate_history: {
+      "02L/20R": [{ time: "2026-06-15T17:45:00+08:00", tdz_temp: 27.1, end_temp: 26.8 }],
+    },
+  };
+  const observationMergedChengdu = mergeObservationPayloadIntoHourly(
+    cachedChengduDetail,
+    observationOnlyPayload as any,
+  );
+  assert(
+    observationMergedChengdu?.airportCurrent?.temp === 27.1 &&
+      observationMergedChengdu?.airportPrimary?.source_code === "amsc_awos",
+    "observation endpoint payload should update the current observation block",
+  );
+  assert(
+    observationMergedChengdu?.modelCurves?.ECMWF?.length === 2 &&
+      observationMergedChengdu?.debHourlyPath?.temps?.includes(30.9),
+    "observation endpoint payload must not clear DEB or multi-model chart detail",
+  );
+  assert(
+    (observationMergedChengdu?.runwayPlateHistory?.["02L/20R"] || []).length === 2,
+    "observation endpoint payload should append fresh runway history onto cached detail history",
+  );
+
   _hourlyCache.clear();
   for (let i = 0; i < 180; i += 1) {
     const row = {

frontend/components/dashboard/scan-terminal/temperature-chart-logic.ts

@@ -1602,6 +1602,16 @@ function mergeHourlyWithLiveObservations(
   };
 }
 
+function mergeObservationPayloadIntoHourly(
+  prev: HourlyForecast,
+  payload: CityObservationPayload | null | undefined,
+): HourlyForecast {
+  const live = observationPayloadToHourly(payload);
+  if (!prev) return live;
+  if (!live) return prev;
+  return mergeHourlyWithLiveObservations(prev, live, null);
+}
+
 function mergeRowObservationIntoHourly(
   prev: HourlyForecast,
   row: ScanOpportunityRow | null,
@@ -1643,6 +1653,22 @@ type HourlyForecastFetchOptions = {
   resolution?: string;
 };
 
+type CityObservationPayload = {
+  city?: string | null;
+  local_date?: string | null;
+  local_time?: string | null;
+  current?: Record<string, any> | null;
+  airport_current?: Record<string, any> | null;
+  airport_primary?: Record<string, any> | null;
+  amos?: AmosData | null;
+  runway_plate_history?: Record<string, Array<Record<string, unknown>>> | null;
+  runway_points?: Array<Record<string, unknown>>;
+  metar_today_obs?: Array<Record<string, any>>;
+  timeseries?: {
+    metar_today_obs?: Array<Record<string, any>>;
+  } | null;
+};
+
 type CityDetailBatchPayload = {
   cities?: string[];
   details?: Record<string, CityDetail | null | undefined>;
@@ -1669,6 +1695,126 @@ const CITY_DETAIL_BATCH_WINDOW_MS = 100;
 const CITY_DETAIL_BATCH_MAX_CITIES = 12;
 const _cityDetailBatchQueues = new Map<string, CityDetailBatchQueue>();
 
+function normalizeObservationCondition(block: Record<string, any> | null | undefined): AirportCurrentConditions | null {
+  if (!block || typeof block !== "object") return null;
+  const temp = validNumber(block.temp);
+  const obsTime = String(block.obs_time || block.observed_at || block.observation_time || block.time || "").trim();
+  if (temp === null || !obsTime) return null;
+  return {
+    ...(block as AirportCurrentConditions),
+    temp,
+    obs_time: obsTime,
+    max_so_far: validNumber(block.max_so_far) ?? validNumber(block.max_temp_so_far) ?? temp,
+    source_code: String(block.source_code || block.source || "").trim() || null,
+    source_label: String(block.source_label || block.settlement_source_label || block.source || "").trim() || null,
+    station_code: String(block.station_code || block.icao || "").trim() || null,
+    station_label: String(block.station_label || block.station_name || "").trim() || null,
+  };
+}
+
+function normalizeObservationPoint(point: Record<string, any>): ObsPoint | null {
+  const temp = validNumber(point.temp);
+  const time = String(point.time || point.obs_time || point.observed_at || point.observation_time || "").trim();
+  if (temp === null || !time) return null;
+  return { time, temp };
+}
+
+function normalizeObservationRunwayHistory(
+  history: CityObservationPayload["runway_plate_history"],
+  runwayPoints: CityObservationPayload["runway_points"],
+) {
+  const normalized: Record<string, Array<Record<string, unknown>>> = {};
+  Object.entries(history || {}).forEach(([runway, points]) => {
+    if (!Array.isArray(points)) return;
+    const normalizedPoints = points
+      .map((point): Record<string, unknown> | null => {
+        if (!point || typeof point !== "object") return null;
+        const value =
+          parseRunwayHistoryValue(point) ??
+          validNumber((point as any).target_runway_max) ??
+          validNumber((point as any).tdz_temp) ??
+          validNumber((point as any).end_temp);
+        const time = String((point as any).timestamp || (point as any).time || (point as any).observed_at || "").trim();
+        if (value === null || !time) return null;
+        return {
+          ...point,
+          timestamp: time,
+          value,
+          temp_c: value,
+        };
+      })
+      .filter((point): point is Record<string, unknown> => point !== null);
+    if (normalizedPoints.length) normalized[runway] = normalizedPoints;
+  });
+
+  for (const point of runwayPoints || []) {
+    if (!point || typeof point !== "object") continue;
+    const runway = String((point as any).runway || "").trim().toUpperCase();
+    if (!runway) continue;
+    const value =
+      parseRunwayHistoryValue(point) ??
+      validNumber((point as any).target_runway_max) ??
+      validNumber((point as any).tdz_temp) ??
+      validNumber((point as any).end_temp);
+    const time = String((point as any).timestamp || (point as any).time || (point as any).observed_at || "").trim();
+    if (value === null || !time) continue;
+    normalized[runway] = [
+      ...(normalized[runway] || []),
+      {
+        ...point,
+        timestamp: time,
+        value,
+        temp_c: value,
+      },
+    ].slice(-MAX_OBS_POINTS);
+  }
+
+  return Object.keys(normalized).length ? normalized : undefined;
+}
+
+function observationPayloadToHourly(payload: CityObservationPayload | null | undefined): HourlyForecast {
+  if (!payload || typeof payload !== "object") return null;
+  const airportCurrent = normalizeObservationCondition(payload.airport_current || payload.current);
+  const airportPrimary = normalizeObservationCondition(payload.airport_primary || payload.airport_current || payload.current);
+  const current = payload.current && typeof payload.current === "object"
+    ? {
+        ...(payload.current as CurrentConditions),
+        temp: validNumber(payload.current.temp),
+      }
+    : null;
+  const metarTodayObs = [
+    ...((payload.timeseries?.metar_today_obs || []) as Array<Record<string, any>>),
+    ...((payload.metar_today_obs || []) as Array<Record<string, any>>),
+  ]
+    .map(normalizeObservationPoint)
+    .filter((point): point is ObsPoint => point !== null);
+  const airportPrimaryTodayObs = (airportPrimary?.obs_time && validNumber(airportPrimary.temp) !== null)
+    ? appendRawObservationPoint(undefined, airportPrimary.obs_time, Number(airportPrimary.temp))
+    : undefined;
+  return {
+    forecastTodayHigh: null,
+    debPrediction: null,
+    debQuality: null,
+    debHourlyPath: null,
+    localDate: payload.local_date || null,
+    localTime: payload.local_time || airportPrimary?.obs_time || airportCurrent?.obs_time || null,
+    times: [],
+    temps: [],
+    modelTimes: undefined,
+    modelCurves: undefined,
+    forecastDaily: [],
+    multiModelDaily: {},
+    probabilities: null,
+    runwayPlateHistory: normalizeObservationRunwayHistory(payload.runway_plate_history, payload.runway_points),
+    amos: payload.amos || null,
+    current,
+    airportCurrent,
+    airportPrimary,
+    metarTodayObs: metarTodayObs.length ? metarTodayObs : undefined,
+    airportPrimaryTodayObs,
+  };
+}
+
 function parseHourlyForecastFromCityDetail(json: CityDetail | null): HourlyForecast {
   const hourlySource = (json as any)?.hourly ?? (json as any)?.timeseries?.hourly;
   if (!json || !hourlySource) return null;
@@ -1895,6 +2041,19 @@ async function fetchCityDetailBatchWithTimeout(
     .finally(() => globalThis.clearTimeout(timeoutId));
 }
 
+async function fetchLiveObservationForCity(city: string): Promise<CityObservationPayload | null> {
+  const headers = await buildBrowserBackendHeaders({ Accept: "application/json" });
+  return fetch(`/api/city/${encodeURIComponent(city)}/observation`, {
+    cache: "no-store",
+    headers,
+  })
+    .then(async (res) => {
+      if (!res.ok) return null;
+      return res.json() as Promise<CityObservationPayload>;
+    })
+    .catch(() => null);
+}
+
 async function fetchHourlyForecastForCity(
   city: string,
   options: HourlyForecastFetchOptions = {},
@@ -3223,6 +3382,7 @@ export {
   buildModelSummaryCards,
   buildRunwayPlates,
   fetchHourlyForecastForCity,
+  fetchLiveObservationForCity,
   getActiveTemperatureSeries,
   getTemperatureSeriesForRunwayDetailsMode,
   getLiveObservationLabels,
@@ -3230,6 +3390,7 @@ export {
   getVisibleTemperatureSeries,
   isTemperatureSeriesVisibleByDefault,
   mergeHourlyWithLiveObservations,
+  mergeObservationPayloadIntoHourly,
   mergePatchIntoHourly,
   mergeRowObservationIntoHourly,
   normObs,

frontend/lib/refresh-policy.ts

@@ -1,5 +1,6 @@
 export const DASHBOARD_REFRESH_POLICY_SEC = {
   observation: 60,
+  liveObservationFallback: 3 * 60,
   metar: 5 * 60,
   scanRows: 2 * 60,
   marketOverview: 10 * 60,
@@ -8,6 +9,7 @@ export const DASHBOARD_REFRESH_POLICY_SEC = {
 
 export const DASHBOARD_REFRESH_POLICY_MS = {
   observation: DASHBOARD_REFRESH_POLICY_SEC.observation * 1000,
+  liveObservationFallback: DASHBOARD_REFRESH_POLICY_SEC.liveObservationFallback * 1000,
   metar: DASHBOARD_REFRESH_POLICY_SEC.metar * 1000,
   scanRows: DASHBOARD_REFRESH_POLICY_SEC.scanRows * 1000,
   marketOverview: DASHBOARD_REFRESH_POLICY_SEC.marketOverview * 1000,

tests/test_city_observation_endpoint.py

@@ -0,0 +1,114 @@
+from fastapi.testclient import TestClient
+
+from web.app import app
+
+
+client = TestClient(app)
+
+
+def test_city_observation_endpoint_is_no_store_and_uses_live_observation_service(monkeypatch):
+    from web.services import city_observation
+
+    calls = []
+
+    def fake_payload(name):
+        calls.append(name)
+        return {
+            "city": "chengdu",
+            "local_date": "2026-06-16",
+            "local_time": "17:45",
+            "current": {
+                "temp": 22.2,
+                "source_code": "amsc_awos",
+                "obs_time": "2026-06-16T17:45:00+08:00",
+            },
+            "airport_current": {
+                "temp": 22.2,
+                "source_code": "amsc_awos",
+                "obs_time": "2026-06-16T17:45:00+08:00",
+            },
+            "runway_plate_history": {
+                "02L/20R": [
+                    {
+                        "time": "2026-06-16T17:45:00+08:00",
+                        "tdz_temp": 22.2,
+                        "end_temp": 22.0,
+                    }
+                ]
+            },
+            "metar_today_obs": [
+                {
+                    "time": "17:45",
+                    "temp": 22.2,
+                    "obs_time": "2026-06-16T17:45:00+08:00",
+                    "source_code": "amsc_awos",
+                }
+            ],
+        }
+
+    monkeypatch.setattr(city_observation, "get_city_observation_payload", fake_payload)
+
+    response = client.get("/api/city/chengdu/observation")
+
+    assert response.status_code == 200
+    assert response.headers["Cache-Control"] == "no-store, max-age=0"
+    assert response.headers["Cloudflare-CDN-Cache-Control"] == "no-store, max-age=0"
+    assert calls == ["chengdu"]
+    payload = response.json()
+    assert payload["airport_current"]["source_code"] == "amsc_awos"
+    assert payload["runway_plate_history"]["02L/20R"][0]["tdz_temp"] == 22.2
+
+
+def test_city_observation_payload_prefers_raw_latest_over_stale_city_cache(monkeypatch):
+    from web.services import city_observation
+
+    class FakeDB:
+        def get_city_cache(self, kind, city):
+            raise AssertionError("observation endpoint must not read city_full_cache")
+
+        def get_latest_raw_observation(self, source, city):
+            if (source, city) != ("amsc_awos", "chengdu"):
+                return None
+            return {
+                "source": "amsc_awos",
+                "city": "chengdu",
+                "station_code": "ZUUU",
+                "station_name": "Chengdu Shuangliu",
+                "observed_at": "2026-06-16T17:45:00+08:00",
+                "payload": {
+                    "source": "amsc_awos",
+                    "source_label": "AMSC AWOS Chengdu Shuangliu",
+                    "icao": "ZUUU",
+                    "temp_c": 22.2,
+                    "observation_time": "2026-06-16T17:45:00+08:00",
+                    "runway_obs": {
+                        "point_temperatures": [
+                            {
+                                "runway": "02L/20R",
+                                "tdz_temp": 22.2,
+                                "end_temp": 22.0,
+                            }
+                        ]
+                    },
+                },
+            }
+
+        def list_latest_raw_observations_for_city(self, city, *, limit=100):
+            return [self.get_latest_raw_observation("amsc_awos", city)]
+
+        def get_airport_obs_recent(self, icao, minutes=180):
+            return []
+
+        def get_canonical_temperature(self, city):
+            return None
+
+    monkeypatch.setattr(city_observation, "_CACHE_DB", FakeDB())
+
+    payload = city_observation.get_city_observation_payload("chengdu")
+
+    assert payload["city"] == "chengdu"
+    assert payload["airport_current"]["temp"] == 22.2
+    assert payload["airport_current"]["source_code"] == "amsc_awos"
+    assert payload["airport_current"]["obs_time"] == "2026-06-16T17:45:00+08:00"
+    assert payload["runway_plate_history"]["02L/20R"][0]["tdz_temp"] == 22.2
+    assert payload["metar_today_obs"][-1]["source_code"] == "amsc_awos"

web/routers/city.py

@@ -16,6 +16,7 @@ from web.services.city_api import (
     get_city_summary_payload,
     list_cities_payload,
 )
+from web.services import city_observation as city_observation_service
 from web.services.city_realtime_stream import get_realtime_stream_payload
 from web.services.request_timing import attach_server_timing_header
 
@@ -153,6 +154,13 @@ async def city_detail_batch(
     return payload
 
 
+@router.get("/api/city/{name}/observation")
+async def city_observation(response: Response, name: str):
+    payload = city_observation_service.get_city_observation_payload(name)
+    apply_no_store(response.headers)
+    return payload
+
+
 @router.get("/api/city/{name}")
 async def city_detail(
     request: Request,

web/services/city_observation.py

@@ -0,0 +1,454 @@
+from __future__ import annotations
+
+from datetime import datetime, timezone
+from typing import Any, Optional
+
+from fastapi import HTTPException
+
+from src.data_collection.city_registry import ALIASES, CITY_REGISTRY
+from src.data_collection.city_time import city_local_datetime, get_city_utc_offset_seconds
+from src.database.db_manager import DBManager
+
+_CACHE_DB = DBManager()
+
+_SOURCE_LABELS = {
+    "amsc_awos": "AMSC AWOS",
+    "amos": "AMOS",
+    "hko_obs": "HKO",
+    "mgm": "MGM",
+    "jma_amedas": "JMA",
+    "cwa": "CWA",
+    "metar": "METAR",
+    "madis_hfmetar": "NOAA MADIS",
+}
+
+_PREFERRED_SOURCES = (
+    "amsc_awos",
+    "amos",
+    "hko_obs",
+    "mgm",
+    "jma_amedas",
+    "cwa",
+    "madis_hfmetar",
+    "metar",
+)
+
+
+def _normalize_city(value: Any) -> str:
+    text = str(value or "").strip().lower()
+    compact = text.replace(" ", "")
+    city = ALIASES.get(text, ALIASES.get(compact, text))
+    if not city or city not in CITY_REGISTRY:
+        raise HTTPException(status_code=404, detail="Unknown city")
+    return city
+
+
+def _to_float(value: Any) -> Optional[float]:
+    try:
+        if value is None or value == "":
+            return None
+        return float(value)
+    except (TypeError, ValueError):
+        return None
+
+
+def _first_text(*values: Any) -> str:
+    for value in values:
+        text = str(value or "").strip()
+        if text:
+            return text
+    return ""
+
+
+def _parse_datetime(value: Any) -> Optional[datetime]:
+    if isinstance(value, datetime):
+        dt = value
+    else:
+        text = str(value or "").strip()
+        if not text:
+            return None
+        if text.endswith("Z"):
+            text = text[:-1] + "+00:00"
+        try:
+            dt = datetime.fromisoformat(text)
+        except ValueError:
+            for fmt in ("%Y-%m-%d %H:%M:%S%z", "%Y-%m-%d %H:%M:%S"):
+                try:
+                    dt = datetime.strptime(text, fmt)
+                    break
+                except ValueError:
+                    continue
+            else:
+                return None
+    if dt.tzinfo is None:
+        dt = dt.replace(tzinfo=timezone.utc)
+    return dt
+
+
+def _epoch(value: Any) -> int:
+    dt = _parse_datetime(value)
+    if dt is None:
+        return 0
+    return int(dt.timestamp())
+
+
+def _row_observed_at(row: dict[str, Any], payload: dict[str, Any]) -> str:
+    return _first_text(
+        payload.get("observation_time"),
+        payload.get("obs_time"),
+        payload.get("observed_at"),
+        row.get("observed_at"),
+        payload.get("observation_time_local"),
+        payload.get("observed_at_local"),
+        row.get("fetched_at"),
+    )
+
+
+def _row_temp(row: dict[str, Any], payload: dict[str, Any]) -> Optional[float]:
+    for key in ("temp", "temp_c", "temperature_c", "temperature", "value"):
+        temp = _to_float(payload.get(key))
+        if temp is not None:
+            return temp
+    return _to_float(row.get("value"))
+
+
+def _source_code(row: dict[str, Any], payload: dict[str, Any]) -> str:
+    return str(row.get("source") or payload.get("source") or "").strip().lower()
+
+
+def _station_code(row: dict[str, Any], payload: dict[str, Any]) -> str:
+    return _first_text(
+        payload.get("icao"),
+        payload.get("station_code"),
+        payload.get("istNo"),
+        row.get("station_code"),
+    ).upper()
+
+
+def _station_name(row: dict[str, Any], payload: dict[str, Any], source_label: str) -> str:
+    return _first_text(
+        payload.get("station_label"),
+        payload.get("station_name"),
+        payload.get("name"),
+        row.get("station_name"),
+        source_label,
+    )
+
+
+def _source_label(source: str, payload: dict[str, Any]) -> str:
+    return _first_text(payload.get("source_label"), _SOURCE_LABELS.get(source), source.upper())
+
+
+def _candidate_score(city: str, row: dict[str, Any], payload: dict[str, Any]) -> tuple[int, int, int]:
+    meta = CITY_REGISTRY.get(city) or {}
+    station = _station_code(row, payload)
+    settlement = str(meta.get("settlement_station_code") or "").strip().upper()
+    icao = str(meta.get("icao") or "").strip().upper()
+    station_priority = 0
+    if settlement and station == settlement:
+        station_priority = 2
+    elif icao and station == icao:
+        station_priority = 1
+    source = _source_code(row, payload)
+    try:
+        source_priority = len(_PREFERRED_SOURCES) - _PREFERRED_SOURCES.index(source)
+    except ValueError:
+        source_priority = 0
+    observed = _row_observed_at(row, payload)
+    return station_priority, _epoch(observed), source_priority
+
+
+def _valid_raw_rows(db: Any, city: str) -> list[tuple[tuple[int, int, int], dict[str, Any], dict[str, Any]]]:
+    rows: list[dict[str, Any]] = []
+    lister = getattr(db, "list_latest_raw_observations_for_city", None)
+    if callable(lister):
+        try:
+            listed = lister(city, limit=100)
+        except Exception:
+            listed = []
+        if isinstance(listed, list):
+            rows.extend([row for row in listed if isinstance(row, dict)])
+
+    if not rows:
+        getter = getattr(db, "get_latest_raw_observation", None)
+        if callable(getter):
+            for source in _PREFERRED_SOURCES:
+                try:
+                    row = getter(source, city)
+                except Exception:
+                    row = None
+                if isinstance(row, dict):
+                    rows.append(row)
+
+    candidates: list[tuple[tuple[int, int, int], dict[str, Any], dict[str, Any]]] = []
+    for row in rows:
+        payload = row.get("payload")
+        if not isinstance(payload, dict):
+            payload = {}
+        if _row_temp(row, payload) is None:
+            continue
+        candidates.append((_candidate_score(city, row, payload), row, payload))
+    return candidates
+
+
+def _airport_log_candidate(db: Any, city: str) -> Optional[dict[str, Any]]:
+    meta = CITY_REGISTRY.get(city) or {}
+    station_codes = [
+        str(meta.get("settlement_station_code") or "").strip().upper(),
+        str(meta.get("icao") or "").strip().upper(),
+    ]
+    reader = getattr(db, "get_airport_obs_recent", None)
+    if not callable(reader):
+        return None
+
+    latest: Optional[tuple[int, dict[str, Any]]] = None
+    for station_code in [code for index, code in enumerate(station_codes) if code and code not in station_codes[:index]]:
+        try:
+            rows = reader(station_code, minutes=180)
+        except Exception:
+            rows = []
+        for row in rows if isinstance(rows, list) else []:
+            if not isinstance(row, dict):
+                continue
+            temp = _to_float(row.get("temp_c") if row.get("temp_c") is not None else row.get("temp"))
+            obs_time = _first_text(row.get("obs_time"), row.get("observed_at"))
+            if temp is None or not obs_time:
+                continue
+            score = _epoch(obs_time)
+            if latest is None or score > latest[0]:
+                latest = (
+                    score,
+                    {
+                        "source": "metar",
+                        "source_label": "METAR",
+                        "station_code": station_code,
+                        "station_name": str(meta.get("airport_name") or station_code),
+                        "temp": round(float(temp), 1),
+                        "obs_time": obs_time,
+                        "observed_at": obs_time,
+                    },
+                )
+    return latest[1] if latest else None
+
+
+def _canonical_candidate(db: Any, city: str) -> Optional[dict[str, Any]]:
+    getter = getattr(db, "get_canonical_temperature", None)
+    if not callable(getter):
+        return None
+    try:
+        row = getter(city)
+    except Exception:
+        return None
+    if not isinstance(row, dict):
+        return None
+    payload = row.get("payload") if isinstance(row.get("payload"), dict) else row
+    temp = _to_float(row.get("value") if row.get("value") is not None else payload.get("value"))
+    if temp is None:
+        return None
+    return {
+        "source": str(row.get("source") or payload.get("source") or "canonical").strip().lower(),
+        "source_label": _first_text(row.get("source_label"), payload.get("source_label"), "Canonical"),
+        "station_code": _first_text(row.get("station_code"), payload.get("station_code")),
+        "station_name": _first_text(row.get("station_name"), payload.get("station_name")),
+        "temp": round(float(temp), 1),
+        "obs_time": _first_text(
+            row.get("observed_at"),
+            payload.get("observed_at"),
+            row.get("updated_at"),
+            payload.get("fetched_at"),
+        ),
+        "observed_at": _first_text(row.get("observed_at"), payload.get("observed_at")),
+    }
+
+
+def _runway_history(row: dict[str, Any], raw_payload: dict[str, Any], obs_time: str) -> dict[str, list[dict[str, Any]]]:
+    history: dict[str, list[dict[str, Any]]] = {}
+    runway_obs = raw_payload.get("runway_obs")
+    points = runway_obs.get("point_temperatures") if isinstance(runway_obs, dict) else None
+    if isinstance(points, list):
+        for point in points:
+            if not isinstance(point, dict):
+                continue
+            runway = str(point.get("runway") or row.get("runway") or "").strip().upper()
+            if not runway:
+                continue
+            entry: dict[str, Any] = {"time": obs_time}
+            for key in ("temp", "tdz_temp", "mid_temp", "end_temp", "target_runway_max"):
+                temp = _to_float(point.get(key))
+                if temp is not None:
+                    entry[key] = round(float(temp), 1)
+            if len(entry) > 1:
+                history.setdefault(runway, []).append(entry)
+
+    runway = str(row.get("runway") or "").strip().upper()
+    value = _to_float(row.get("value"))
+    if runway and value is not None and runway not in history:
+        history[runway] = [{"time": obs_time, "temp": round(float(value), 1)}]
+    return history
+
+
+def _local_context(city: str, obs_time: str) -> tuple[str, str, int]:
+    dt = _parse_datetime(obs_time)
+    if dt is None:
+        local = city_local_datetime(city)
+    else:
+        local = city_local_datetime(city, dt.astimezone(timezone.utc))
+    return local.date().isoformat(), local.strftime("%H:%M"), get_city_utc_offset_seconds(city, local)
+
+
+def _observation_block(
+    *,
+    city: str,
+    source: str,
+    source_label: str,
+    station_code: str,
+    station_name: str,
+    temp: float,
+    obs_time: str,
+    observed_at_local: str = "",
+) -> dict[str, Any]:
+    freshness = {
+        "freshness_status": "fresh",
+        "observed_at": obs_time or None,
+        "observed_at_local": observed_at_local or None,
+        "source_code": source,
+        "source_label": source_label,
+    }
+    return {
+        "city": city,
+        "temp": round(float(temp), 1),
+        "source_code": source,
+        "source_label": source_label,
+        "settlement_source": source,
+        "settlement_source_label": source_label,
+        "station_code": station_code or None,
+        "station_name": station_name or source_label,
+        "observed_at": obs_time or None,
+        "observed_at_local": observed_at_local or None,
+        "obs_time": obs_time or observed_at_local,
+        "freshness": freshness,
+        "observation_status": "live",
+    }
+
+
+def _payload_from_raw(city: str, row: dict[str, Any], raw_payload: dict[str, Any]) -> dict[str, Any]:
+    temp = _row_temp(row, raw_payload)
+    if temp is None:
+        raise HTTPException(status_code=404, detail="No live observation")
+    source = _source_code(row, raw_payload) or "raw_observation"
+    label = _source_label(source, raw_payload)
+    obs_time = _row_observed_at(row, raw_payload)
+    observed_at_local = _first_text(
+        raw_payload.get("observation_time_local"),
+        raw_payload.get("observed_at_local"),
+    )
+    local_date, local_time, offset_seconds = _local_context(city, obs_time)
+    current = _observation_block(
+        city=city,
+        source=source,
+        source_label=label,
+        station_code=_station_code(row, raw_payload),
+        station_name=_station_name(row, raw_payload, label),
+        temp=temp,
+        obs_time=obs_time,
+        observed_at_local=observed_at_local,
+    )
+    runway_history = _runway_history(row, raw_payload, obs_time)
+    metar_point = {
+        "time": local_time,
+        "temp": round(float(temp), 1),
+        "obs_time": obs_time,
+        "source_code": source,
+        "source_label": label,
+    }
+    return {
+        "city": city,
+        "name": city,
+        "display_name": str((CITY_REGISTRY.get(city) or {}).get("name") or city),
+        "source": "live_observation",
+        "local_date": local_date,
+        "local_time": local_time,
+        "utc_offset_seconds": offset_seconds,
+        "updated_at": obs_time or row.get("fetched_at"),
+        "current": current,
+        "airport_current": dict(current),
+        "airport_primary": dict(current),
+        "amos": dict(raw_payload),
+        "raw_observation": {
+            "source": source,
+            "station_code": _station_code(row, raw_payload) or None,
+            "observed_at": obs_time or None,
+            "fetched_at": row.get("fetched_at") or None,
+        },
+        "runway_plate_history": runway_history,
+        "runway_points": [
+            {**point, "runway": runway}
+            for runway, points in runway_history.items()
+            for point in points
+        ],
+        "metar_today_obs": [metar_point],
+        "timeseries": {"metar_today_obs": [metar_point]},
+        "observation_status": "live",
+    }
+
+
+def _payload_from_block(city: str, block: dict[str, Any]) -> dict[str, Any]:
+    temp = _to_float(block.get("temp"))
+    if temp is None:
+        raise HTTPException(status_code=404, detail="No live observation")
+    obs_time = _first_text(block.get("obs_time"), block.get("observed_at"))
+    local_date, local_time, offset_seconds = _local_context(city, obs_time)
+    source = str(block.get("source") or block.get("source_code") or "observation").strip().lower()
+    label = _first_text(block.get("source_label"), _SOURCE_LABELS.get(source), source.upper())
+    current = _observation_block(
+        city=city,
+        source=source,
+        source_label=label,
+        station_code=str(block.get("station_code") or "").strip().upper(),
+        station_name=str(block.get("station_name") or label).strip(),
+        temp=temp,
+        obs_time=obs_time,
+    )
+    metar_point = {
+        "time": local_time,
+        "temp": round(float(temp), 1),
+        "obs_time": obs_time,
+        "source_code": source,
+        "source_label": label,
+    }
+    return {
+        "city": city,
+        "name": city,
+        "display_name": str((CITY_REGISTRY.get(city) or {}).get("name") or city),
+        "source": "live_observation",
+        "local_date": local_date,
+        "local_time": local_time,
+        "utc_offset_seconds": offset_seconds,
+        "updated_at": obs_time,
+        "current": current,
+        "airport_current": dict(current),
+        "airport_primary": dict(current),
+        "runway_plate_history": {},
+        "runway_points": [],
+        "metar_today_obs": [metar_point],
+        "timeseries": {"metar_today_obs": [metar_point]},
+        "observation_status": "live",
+    }
+
+
+def get_city_observation_payload(name: str) -> dict[str, Any]:
+    city = _normalize_city(name)
+    candidates = _valid_raw_rows(_CACHE_DB, city)
+    if candidates:
+        _, row, raw_payload = max(candidates, key=lambda item: item[0])
+        return _payload_from_raw(city, row, raw_payload)
+
+    airport_log = _airport_log_candidate(_CACHE_DB, city)
+    if airport_log:
+        return _payload_from_block(city, airport_log)
+
+    canonical = _canonical_candidate(_CACHE_DB, city)
+    if canonical:
+        return _payload_from_block(city, canonical)
+
+    raise HTTPException(status_code=404, detail="No live observation")