Prevent terminal auth spinner deadlock

Avoid terminal full-detail fallback overload
Slim terminal chart detail batches
2026-06-01 12:36:29 +08:00 · 2026-06-01 12:06:46 +08:00 · 2026-06-01 11:37:16 +08:00 · 2026-06-01 07:05:08 +08:00 · 2026-06-01 06:46:34 +08:00 · 2026-06-01 06:25:27 +08:00
39 changed files with 2353 additions and 268 deletions
@@ -28,6 +28,9 @@ services:
    env_file: &id001
    - .env
    environment:
+      POLYWEATHER_REDIS_URL: ${POLYWEATHER_REDIS_URL:-redis://polyweather_redis:6379/0}
+      POLYWEATHER_SCAN_TERMINAL_PREWARM_ENABLED: 'false'
+      POLYWEATHER_SERVICE_ROLE: bot
      TELEGRAM_AIRPORT_PUSH_INTERVAL_SEC: ${POLYWEATHER_BOT_AIRPORT_PUSH_INTERVAL_SEC:-180}
      TELEGRAM_AIRPORT_PUSH_MAX_WORKERS: ${POLYWEATHER_BOT_AIRPORT_PUSH_MAX_WORKERS:-1}
    healthcheck:
@@ -93,6 +96,9 @@ services:
        max-file: "3"
    container_name: polyweather_web
    env_file: *id001
+    environment:
+      POLYWEATHER_REDIS_URL: ${POLYWEATHER_REDIS_URL:-redis://polyweather_redis:6379/0}
+      POLYWEATHER_SERVICE_ROLE: web
    healthcheck:
      interval: 30s
      retries: 3
@@ -192,7 +192,7 @@ Ops：
 - 支付相关路由：`no-store`
 - 当 detail 缓存只返回单模型或单日 forecast 时，前端会自动强刷完整 detail，并在补齐前显示同步提示 / 占位卡
 - 今日日内分析打开时如果正在切换城市、日期或 detail 深度，弹窗会阻断旧内容点击并显示刷新锁
- 终端图表订阅 `/api/events?cities=...&since_revision=...&replay_limit=500`，接收 `city_observation_patch.v1`；无 patch 超过 2 分钟时，可见图表才触发 60 秒兜底刷新
+- 终端图表订阅 `/api/events?cities=...&since_revision=...&replay_limit=按可见城市数动态限制`，接收 `city_observation_patch.v1`；无 patch 超过 2 分钟时，可见图表才触发 60 秒兜底刷新
 - 前端只消费 HTTP snapshot + SSE patch，不直接感知 Redis；Redis Stream / SQLite event log 都由后端统一封装

 ## Vercel 节流建议
@@ -31,7 +31,7 @@ export async function GET(req: NextRequest) {
    force_refresh: forceRefresh,
    limit: req.nextUrl.searchParams.get("limit") || "12",
  });
-  for (const key of ["market_slug", "target_date", "resolution"]) {
+  for (const key of ["market_slug", "target_date", "resolution", "scope"]) {
    const value = req.nextUrl.searchParams.get(key);
    if (value) searchParams.set(key, value);
  }
@@ -9,7 +9,7 @@ import {

 const API_BASE = process.env.POLYWEATHER_API_BASE_URL;
 const SCAN_TERMINAL_PROXY_TIMEOUT_MS = Number(
-  process.env.POLYWEATHER_SCAN_TERMINAL_PROXY_TIMEOUT_MS || "40000",
+  process.env.POLYWEATHER_SCAN_TERMINAL_PROXY_TIMEOUT_MS || "18000",
 );

 export const maxDuration = 45;
@@ -46,7 +46,11 @@ import { scanRootClass } from "@/components/dashboard/scan-root-styles";
 import { useRelativeTime } from "@/hooks/useRelativeTime";
 import { Panel } from "@/components/dashboard/scan-terminal/Panel";
 import { UsageGuideDashboard } from "@/components/dashboard/scan-terminal/UsageGuideDashboard";
-import { LiveTemperatureThresholdChart, clearCityDetailCache } from "@/components/dashboard/scan-terminal/LiveTemperatureThresholdChart";
+import {
+  LiveTemperatureThresholdChart,
+  clearCityDetailCache,
+  preloadTemperatureChartCanvas,
+} from "@/components/dashboard/scan-terminal/LiveTemperatureThresholdChart";
 import { KoyfinRowsTable } from "@/components/dashboard/scan-terminal/KoyfinRowsTable";
 import { rowName, pct, money, temp, edgeClass } from "@/components/dashboard/scan-terminal/utils";
 import { CitySelectorDropdown } from "@/components/dashboard/scan-terminal/CitySelectorDropdown";
@@ -62,6 +66,8 @@ import {
 import {
  cityListItemsToScanRows,
  mergeScanRowsWithCityFallbackRows,
+  readCachedCityList,
+  writeCachedCityList,
 } from "@/components/dashboard/scan-terminal/city-fallback-rows";
 import { markAnalyticsOnce, trackAppEvent } from "@/lib/app-analytics";
 import { STATIC_CITY_LIST } from "@/lib/static-cities";
@@ -81,6 +87,10 @@ const TrainingDashboard = dynamic(
 );

 const ONLINE_USERS_REFRESH_MS = 5 * 60_000;
+const AUTH_PROFILE_REQUEST_TIMEOUT_MS = 4500;
+const AUTH_DECISION_RECOVERY_MS = 10_000;
+const ACTIVE_ACCESS_CACHE_KEY = "polyweather_terminal_active_access_v1";
+const ACTIVE_ACCESS_CACHE_TTL_MS = 6 * 60 * 60 * 1000;

 function createEmptyAccess(loading = true): ProAccessState {
  return {
@@ -112,6 +122,67 @@ function createLocalAccess(): ProAccessState {
  };
 }

+function isFutureAccessExpiry(value: string | null | undefined, now = Date.now()) {
+  if (!value) return true;
+  const ts = Date.parse(value);
+  return Number.isFinite(ts) && ts > now;
+}
+
+function readCachedActiveAccess(now = Date.now()): ProAccessState | null {
+  if (typeof window === "undefined") return null;
+  try {
+    const raw = window.localStorage.getItem(ACTIVE_ACCESS_CACHE_KEY);
+    if (!raw) return null;
+    const cached = JSON.parse(raw);
+    const access = cached?.access as Partial<ProAccessState> | undefined;
+    const ts = Number(cached?.ts || 0);
+    if (!access?.authenticated || !access.subscriptionActive) return null;
+    if (!ts || now - ts < 0 || now - ts > ACTIVE_ACCESS_CACHE_TTL_MS) return null;
+    if (!isFutureAccessExpiry(access.subscriptionTotalExpiresAt || access.subscriptionExpiresAt, now)) {
+      return null;
+    }
+    return {
+      loading: false,
+      authenticated: true,
+      userId: access.userId ?? null,
+      subscriptionActive: true,
+      subscriptionPlanCode: access.subscriptionPlanCode ?? null,
+      subscriptionExpiresAt: access.subscriptionExpiresAt ?? null,
+      subscriptionTotalExpiresAt:
+        access.subscriptionTotalExpiresAt ?? access.subscriptionExpiresAt ?? null,
+      subscriptionQueuedDays: Number(access.subscriptionQueuedDays ?? 0),
+      points: Number(access.points ?? 0),
+      error: null,
+    };
+  } catch {
+    return null;
+  }
+}
+
+function writeCachedActiveAccess(access: ProAccessState) {
+  if (typeof window === "undefined") return;
+  if (!access.authenticated || !access.subscriptionActive) return;
+  if (!isFutureAccessExpiry(access.subscriptionTotalExpiresAt || access.subscriptionExpiresAt)) return;
+  try {
+    window.localStorage.setItem(
+      ACTIVE_ACCESS_CACHE_KEY,
+      JSON.stringify({
+        ts: Date.now(),
+        access: {
+          authenticated: access.authenticated,
+          userId: access.userId,
+          subscriptionActive: access.subscriptionActive,
+          subscriptionPlanCode: access.subscriptionPlanCode,
+          subscriptionExpiresAt: access.subscriptionExpiresAt,
+          subscriptionTotalExpiresAt: access.subscriptionTotalExpiresAt,
+          subscriptionQueuedDays: access.subscriptionQueuedDays,
+          points: access.points,
+        },
+      }),
+    );
+  } catch {}
+}
+
 function createTransientAccess(error: unknown): ProAccessState {
  return {
    ...createEmptyAccess(true),
@@ -428,6 +499,11 @@ function PolyWeatherTerminal({
  const [activeNavKey, setActiveNavKey] = useState<string>("thresholds");
  const [onlineCount, setOnlineCount] = useState<number | null>(null);

+  useEffect(() => {
+    if (activeNavKey !== "thresholds") return;
+    void preloadTemperatureChartCanvas();
+  }, [activeNavKey]);
+
  useEffect(() => {
    const fetchOnline = () => {
      if (typeof document !== "undefined" && document.visibilityState === "hidden") return;
@@ -960,6 +1036,73 @@ function PolyWeatherTerminal({
  );
 }

+function AuthSyncRecoveryScreen({
+  isEn,
+  onRetry,
+  rootClassName,
+  retrying,
+  themeMode,
+  userLocalTime,
+}: {
+  isEn: boolean;
+  onRetry: () => void;
+  rootClassName: string;
+  retrying: boolean;
+  themeMode: "dark" | "light";
+  userLocalTime: string;
+}) {
+  return (
+    <div className={rootClassName}>
+      <div className={clsx("flex h-screen w-full bg-[#e9edf3] text-slate-950", themeMode === "light" && "light")}>
+        <aside className="w-[52px] bg-[#171d24]" />
+        <main className="flex flex-1 flex-col">
+          <header className="flex h-[52px] items-center justify-between border-b border-slate-200 bg-white px-4">
+            <Link href="/" className="flex items-center gap-2 hover:opacity-90">
+              <img src="/logo.png" alt="PolyWeather" className="h-7 w-auto object-contain" />
+              <span className="text-sm font-semibold tracking-tight text-slate-900">Terminal</span>
+            </Link>
+            <div className="font-mono text-sm text-slate-500">{userLocalTime}</div>
+          </header>
+          <section className="grid flex-1 place-items-center p-6">
+            <div className="w-full max-w-md rounded-[6px] border border-amber-200 bg-white p-6 shadow-sm">
+              <div className="mb-3 inline-flex rounded-full border border-amber-200 bg-amber-50 px-2.5 py-1 text-[11px] font-black text-amber-700">
+                {isEn ? "Access sync timeout" : "权限同步超时"}
+              </div>
+              <h1 className="text-xl font-black text-slate-950">
+                {isEn ? "We could not confirm your subscription yet" : "暂时未能确认你的订阅状态"}
+              </h1>
+              <p className="mt-3 text-sm leading-6 text-slate-600">
+                {isEn
+                  ? "The session or entitlement service is taking too long. Retry access sync; if you just paid, wait a few seconds and try again."
+                  : "当前会话或会员服务响应过慢。请先重新同步权限；如果刚完成支付，等待几秒后再试。"}
+              </p>
+              <div className="mt-5 flex flex-col gap-3 sm:flex-row">
+                <button
+                  type="button"
+                  onClick={onRetry}
+                  disabled={retrying}
+                  className="inline-flex flex-1 items-center justify-center gap-2 rounded-[4px] bg-blue-600 px-4 py-2.5 text-sm font-black text-white transition hover:bg-blue-700 disabled:cursor-wait disabled:opacity-70"
+                >
+                  {retrying && (
+                    <span className="h-4 w-4 animate-spin rounded-full border-2 border-white/70 border-t-transparent" />
+                  )}
+                  {isEn ? "Retry access sync" : "重新同步权限"}
+                </button>
+                <Link
+                  href="/account"
+                  className="inline-flex flex-1 items-center justify-center rounded-[4px] border border-slate-200 bg-white px-4 py-2.5 text-sm font-black text-slate-700 transition hover:bg-slate-50"
+                >
+                  {isEn ? "Open account" : "打开账户页"}
+                </Link>
+              </div>
+            </div>
+          </section>
+        </main>
+      </div>
+    </div>
+  );
+}
+
 function ScanTerminalScreen() {
  const [proAccess, setProAccess] = useState<ProAccessState>(() =>
    createEmptyAccess(true),
@@ -973,17 +1116,26 @@ function ScanTerminalScreen() {
      const headers: Record<string, string> = { Accept: "application/json" };
      const token = String(accessToken || "").trim();
      if (token) headers.Authorization = `Bearer ${token}`;
-      const response = await fetch(
-        options?.preferSnapshot
-          ? "/api/auth/me?prefer_snapshot=1"
-          : "/api/auth/me",
-        {
-          cache: "no-store",
-          headers,
-        },
-      );
-      if (!response.ok) throw new Error(`HTTP ${response.status}`);
-      return response.json() as Promise<AuthProfilePayload>;
+      const controller = typeof AbortController !== "undefined" ? new AbortController() : null;
+      const timeoutId = controller
+        ? globalThis.setTimeout(() => controller.abort(), AUTH_PROFILE_REQUEST_TIMEOUT_MS)
+        : null;
+      try {
+        const response = await fetch(
+          options?.preferSnapshot
+            ? "/api/auth/me?prefer_snapshot=1"
+            : "/api/auth/me",
+          {
+            cache: "no-store",
+            headers,
+            signal: controller?.signal,
+          },
+        );
+        if (!response.ok) throw new Error(`HTTP ${response.status}`);
+        return response.json() as Promise<AuthProfilePayload>;
+      } finally {
+        if (timeoutId !== null) globalThis.clearTimeout(timeoutId);
+      }
    },
    [],
  );
@@ -1020,6 +1172,7 @@ function ScanTerminalScreen() {
      hasSupabasePublicEnv: supabaseEnabled,
      loadAuthProfile: (accessToken) =>
        loadAuthProfile(accessToken, { preferSnapshot: false }),
+      timeoutMs: AUTH_PROFILE_REQUEST_TIMEOUT_MS + 2000,
    });
    setProAccess((prev) => mergeAccessStateWithAuthPayload(prev, payload));
  }, [loadAuthProfile]);
@@ -1082,13 +1235,17 @@ function ScanTerminalScreen() {
    setLocale((prev) => (prev === "zh-CN" ? "en-US" : "zh-CN"));
  const [hydrated, setHydrated] = useState(false);
  const [localFullAccess, setLocalFullAccess] = useState(false);
+  const [authWaitExpired, setAuthWaitExpired] = useState(false);
+  const [authRetrying, setAuthRetrying] = useState(false);
  const canUseLocalFullAccess = hydrated && localFullAccess;
  const isAuthenticated =
    hydrated && (proAccess.authenticated || canUseLocalFullAccess);
  const isPro =
    hydrated && (proAccess.subscriptionActive || canUseLocalFullAccess);
  const accessDecisionPending =
-    !hydrated || (proAccess.loading && !canUseLocalFullAccess);
+    !hydrated || (proAccess.loading && !canUseLocalFullAccess && !authWaitExpired);
+  const authSyncRecoveryNeeded =
+    hydrated && proAccess.loading && !canUseLocalFullAccess && authWaitExpired;
  const shouldShowPaywall = !accessDecisionPending && (!isAuthenticated || !isPro);
  const userLocalTime = useUserLocalClock();
  const { themeMode } = useScanTerminalTheme();
@@ -1128,6 +1285,10 @@ function ScanTerminalScreen() {
        cancelled = true;
      };
    }
+    const cachedActiveAccess = readCachedActiveAccess();
+    if (cachedActiveAccess) {
+      setProAccess(cachedActiveAccess);
+    }
    if (typeof fetch !== "function") {
      setProAccess(createEmptyAccess(false));
      return () => {
@@ -1142,6 +1303,7 @@ function ScanTerminalScreen() {
          : Promise.resolve({ data: { session: null } }),
      hasSupabasePublicEnv: supabaseEnabled,
      loadAuthProfile,
+      timeoutMs: AUTH_PROFILE_REQUEST_TIMEOUT_MS + 2000,
    })
      .then((payload) => {
        if (cancelled) return;
@@ -1165,6 +1327,23 @@ function ScanTerminalScreen() {
    };
  }, [loadAuthProfile, refreshLiveAuthProfile]);

+  useEffect(() => {
+    if (!hydrated || !proAccess.loading || canUseLocalFullAccess) {
+      setAuthWaitExpired(false);
+      return;
+    }
+    const timer = window.setTimeout(() => {
+      setAuthWaitExpired(true);
+    }, AUTH_DECISION_RECOVERY_MS);
+    return () => window.clearTimeout(timer);
+  }, [canUseLocalFullAccess, hydrated, proAccess.loading]);
+
+  useEffect(() => {
+    if (hydrated && proAccess.authenticated && proAccess.subscriptionActive) {
+      writeCachedActiveAccess(proAccess);
+    }
+  }, [hydrated, proAccess]);
+
  useEffect(() => {
    if (
      !hydrated ||
@@ -1188,6 +1367,7 @@ function ScanTerminalScreen() {
              : Promise.resolve({ data: { session: null } }),
          hasSupabasePublicEnv: supabaseEnabled,
          loadAuthProfile,
+          timeoutMs: AUTH_PROFILE_REQUEST_TIMEOUT_MS + 2000,
        });
        if (cancelled) return;
        setProAccess((prev) => mergeAccessStateWithAuthPayload(prev, payload));
@@ -1253,9 +1433,20 @@ function ScanTerminalScreen() {
    clearCityDetailCache();
    refreshScanTerminalManually();
  }, [refreshScanTerminalManually]);
+  const handleRetryAuthSync = useCallback(() => {
+    setAuthRetrying(true);
+    setAuthWaitExpired(false);
+    void refreshLiveAuthProfile()
+      .catch((error) => {
+        setProAccess((prev) => ({ ...prev, error: String(error) }));
+      })
+      .finally(() => {
+        setAuthRetrying(false);
+      });
+  }, [refreshLiveAuthProfile]);

  const [cityFallbackRows, setCityFallbackRows] = useState<ScanOpportunityRow[]>(() =>
-    cityListItemsToScanRows(STATIC_CITY_LIST),
+    cityListItemsToScanRows(readCachedCityList() || STATIC_CITY_LIST),
  );
  const rows = useMemo(
    () => {
@@ -1271,9 +1462,15 @@ function ScanTerminalScreen() {
  useEffect(() => {
    if (!isPro || typeof fetch !== "function") return;
    if (fallbackFetchedRef.current) return;
+    const cachedCities = readCachedCityList();
+    if (cachedCities) {
+      fallbackFetchedRef.current = true;
+      setCityFallbackRows(cityListItemsToScanRows(cachedCities));
+      return;
+    }
    const controller = new AbortController();
    fetch("/api/cities", {
-      cache: "no-store",
+      cache: "default",
      headers: { Accept: "application/json" },
      signal: controller.signal,
    })
@@ -1284,6 +1481,7 @@ function ScanTerminalScreen() {
      .then((payload) => {
        if (!payload || !Array.isArray(payload.cities)) return;
        fallbackFetchedRef.current = true;
+        writeCachedCityList(payload.cities);
        setCityFallbackRows(cityListItemsToScanRows(payload.cities));
      })
      .catch(() => {});
@@ -1338,6 +1536,19 @@ function ScanTerminalScreen() {
    );
  }

+  if (authSyncRecoveryNeeded) {
+    return (
+      <AuthSyncRecoveryScreen
+        isEn={isEn}
+        onRetry={handleRetryAuthSync}
+        rootClassName={scanRootClass}
+        retrying={authRetrying}
+        themeMode={themeMode}
+        userLocalTime={userLocalTime}
+      />
+    );
+  }
+
  if (shouldShowPaywall) {
    return (
      <ProductAccessRequired
@@ -1,13 +1,12 @@
 "use client";

 import clsx from "clsx";
-import dynamic from "next/dynamic";
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import type { ScanOpportunityRow } from "@/lib/dashboard-types";
 import { useLatestPatch, useSseResyncVersion } from "@/hooks/use-sse-patches";
 import { Panel } from "@/components/dashboard/scan-terminal/Panel";
 import { ModelCurvesSummary } from "@/components/dashboard/scan-terminal/ModelCurvesSummary";
-import { TemperatureChartCanvasFallback } from "@/components/dashboard/scan-terminal/TemperatureChartCanvasFallback";
+import { TemperatureChartCanvas } from "@/components/dashboard/scan-terminal/TemperatureChartCanvas";
 import { TemperatureRunwayDetails } from "@/components/dashboard/scan-terminal/TemperatureRunwayDetails";
 import { TemperatureStatsBars } from "@/components/dashboard/scan-terminal/TemperatureStatsBars";
 import { rowName } from "@/components/dashboard/scan-terminal/utils";
@@ -56,17 +55,16 @@ const PEAK_GLOW_BADGE_CLASS = {
 } as const;

 const PROBABILITY_REFRESH_AFTER_PATCH_MS = 60_000;
+const FOREGROUND_FULL_DETAIL_REFRESH_DEDUP_MS = 90_000;
+const DETAIL_LOAD_BATCH_DELAY_MS = 0;
+const INITIAL_DETAIL_LOAD_SLOTS = 3;
+const DEFERRED_DETAIL_LOAD_DELAY_MS = 1_200;
+const DEFERRED_DETAIL_LOAD_GROUP_SIZE = 3;
+const DEFERRED_DETAIL_LOAD_WAVE_STEP_MS = 900;

-const TemperatureChartCanvas = dynamic(
-  () =>
-    import("@/components/dashboard/scan-terminal/TemperatureChartCanvas").then(
-      (mod) => mod.TemperatureChartCanvas,
-    ),
-  {
-    ssr: false,
-    loading: () => <TemperatureChartCanvasFallback />,
-  },
-);
+export function preloadTemperatureChartCanvas() {
+  return Promise.resolve();
+}

 function peakGlowLabel(state: keyof typeof PEAK_GLOW_PANEL_CLASS, isEn: boolean) {
  if (state === "watch") return isEn ? "Watch" : "关注";
@@ -113,12 +111,49 @@ function shouldFetchCityDetailForChart({
  city,
  documentHidden,
  isChartVisible,
+  compact = false,
+  isActive = false,
+  isMaximized = false,
+  slotIndex = 0,
+  detailLoadReady = true,
 }: {
  city: string;
  documentHidden: boolean;
  isChartVisible: boolean;
+  compact?: boolean;
+  isActive?: boolean;
+  isMaximized?: boolean;
+  slotIndex?: number;
+  detailLoadReady?: boolean;
 }) {
-  return Boolean(city) && isChartVisible && !documentHidden;
+  if (!city || !isChartVisible || documentHidden) return false;
+  if (!compact || isActive || isMaximized) return true;
+  if (normalizeSlotIndex(slotIndex) < INITIAL_DETAIL_LOAD_SLOTS) return true;
+  return detailLoadReady;
+}
+
+function normalizeSlotIndex(slotIndex: number | null | undefined) {
+  return Number.isFinite(slotIndex) && Number(slotIndex) >= 0 ? Math.floor(Number(slotIndex)) : 0;
+}
+
+function getInitialDetailLoadDelayMs({
+  compact,
+  isActive,
+  isMaximized,
+  slotIndex,
+}: {
+  compact?: boolean;
+  isActive?: boolean;
+  isMaximized?: boolean;
+  slotIndex?: number;
+}) {
+  if (!compact || isActive || isMaximized) return 0;
+  const normalizedIndex = normalizeSlotIndex(slotIndex);
+  if (normalizedIndex < INITIAL_DETAIL_LOAD_SLOTS) return 0;
+  const deferredWave = Math.floor(
+    (normalizedIndex - INITIAL_DETAIL_LOAD_SLOTS) / DEFERRED_DETAIL_LOAD_GROUP_SIZE,
+  );
+  return DEFERRED_DETAIL_LOAD_DELAY_MS + deferredWave * DEFERRED_DETAIL_LOAD_WAVE_STEP_MS;
 }

 // ── Main component ─────────────────────────────────────────────────────
@@ -165,6 +200,7 @@ export function LiveTemperatureThresholdChart({
  const lastPatchAtRef = useRef<number>(Date.now());
  const lastAppliedPatchRevisionRef = useRef<number>(0);
  const lastProbabilityRefreshAtRef = useRef<number>(0);
+  const lastForegroundRefreshAtRef = useRef<number>(0);
  const localDayRolloverFetchDateRef = useRef<string>("");
  const [isChartVisible, setIsChartVisible] = useState(
    () => typeof IntersectionObserver === "undefined",
@@ -177,6 +213,11 @@ export function LiveTemperatureThresholdChart({
  const [targetResolution, setTargetResolution] = useState<string>(() =>
    prefersHighFrequencyRunwayResolution(row, null) ? "1m" : "10m",
  );
+  const detailLoadDelayMs = useMemo(
+    () => getInitialDetailLoadDelayMs({ compact, isActive, isMaximized, slotIndex }),
+    [compact, isActive, isMaximized, slotIndex],
+  );
+  const [detailLoadReady, setDetailLoadReady] = useState(() => detailLoadDelayMs === 0);
  const [currentCityLocalDate, setCurrentCityLocalDate] = useState(() =>
    formatCityLocalDate(row?.tz_offset_seconds),
  );
@@ -189,7 +230,7 @@ export function LiveTemperatureThresholdChart({
    setTargetResolution(prefersHighFrequencyRunwayResolution(row, null) ? "1m" : "10m");
    setHourly(seedHourlyForecastFromRow(row));
    setLiveTemp(null);
-    setIsHourlyLoading(Boolean(city));
+    setIsHourlyLoading(Boolean(city) && detailLoadDelayMs === 0);
    setDetailError(null);
    setDetailRetryNonce(0);
    setShowingStaleDetail(false);
@@ -197,9 +238,25 @@ export function LiveTemperatureThresholdChart({
    lastPatchAtRef.current = Date.now();
    lastAppliedPatchRevisionRef.current = 0;
    lastProbabilityRefreshAtRef.current = 0;
+    lastForegroundRefreshAtRef.current = 0;
    localDayRolloverFetchDateRef.current = "";
    setCurrentCityLocalDate(formatCityLocalDate(row?.tz_offset_seconds));
-  }, [city]);
+  }, [city, detailLoadDelayMs]);
+
+  useEffect(() => {
+    if (!city) {
+      setDetailLoadReady(false);
+      return;
+    }
+    if (detailLoadDelayMs <= 0) {
+      setDetailLoadReady(true);
+      return;
+    }
+
+    setDetailLoadReady(false);
+    const id = setTimeout(() => setDetailLoadReady(true), detailLoadDelayMs);
+    return () => clearTimeout(id);
+  }, [city, detailLoadDelayMs]);

  useEffect(() => {
    const node = chartVisibilityRef.current;
@@ -232,17 +289,6 @@ export function LiveTemperatureThresholdChart({
      return;
    }

-    if (
-      !shouldFetchCityDetailForChart({
-        city,
-        documentHidden:
-          typeof document !== "undefined" && document.visibilityState === "hidden",
-        isChartVisible,
-      })
-    ) {
-      return;
-    }
-    
    const cacheKey = `${city}:${targetResolution}`;
    let cached = _hourlyCache.get(cacheKey);
    if (!cached || Date.now() - Number(cached.ts || 0) >= HOURLY_CACHE_TTL_MS) {
@@ -267,6 +313,23 @@ export function LiveTemperatureThresholdChart({
      return;
    }

+    if (
+      !shouldFetchCityDetailForChart({
+        city,
+        documentHidden:
+          typeof document !== "undefined" && document.visibilityState === "hidden",
+        isChartVisible,
+        compact,
+        isActive,
+        isMaximized,
+        slotIndex,
+        detailLoadReady,
+      })
+    ) {
+      setIsHourlyLoading(false);
+      return;
+    }
+
    if (!cached && !hasLoadedHourlyDetailRef.current) {
      setHourly(seedHourlyForecastFromRow(row));
      setShowingStaleDetail(false);
@@ -274,9 +337,6 @@ export function LiveTemperatureThresholdChart({
    setIsHourlyLoading(true);
    let cancelled = false;

-    // Prioritize active slots, stagger/delay background slots to optimize load performance
-    const delay = isActive ? 0 : (slotIndex ? 300 + slotIndex * 250 : 350);
-
    const timer = setTimeout(() => {
      fetchHourlyForecastForCity(city, { resolution: targetResolution })
        .then((data) => {
@@ -296,13 +356,25 @@ export function LiveTemperatureThresholdChart({
        .finally(() => {
          if (!cancelled) setIsHourlyLoading(false);
        });
-    }, delay);
+    }, DETAIL_LOAD_BATCH_DELAY_MS);

    return () => {
      cancelled = true;
      clearTimeout(timer);
    };
-  }, [city, row, isActive, slotIndex, targetResolution, isChartVisible, detailRetryNonce, isEn]);
+  }, [
+    city,
+    row,
+    targetResolution,
+    isChartVisible,
+    compact,
+    isActive,
+    isMaximized,
+    slotIndex,
+    detailLoadReady,
+    detailRetryNonce,
+    isEn,
+  ]);

  useEffect(() => {
    if (!latestPatch || latestPatch.revision <= lastAppliedPatchRevisionRef.current) return;
@@ -398,7 +470,19 @@ export function LiveTemperatureThresholdChart({
    let cancelled = false;

    const refreshForegroundFullDetail = () => {
-      lastPatchAtRef.current = Date.now();
+      const now = Date.now();
+      const cacheKey = `${city}:${targetResolution}`;
+      const cached = _hourlyCache.get(cacheKey);
+      const cacheAge = cached ? now - Number(cached.ts || 0) : Number.POSITIVE_INFINITY;
+      if (
+        now - lastForegroundRefreshAtRef.current < FOREGROUND_FULL_DETAIL_REFRESH_DEDUP_MS ||
+        (cacheAge >= 0 && cacheAge < FOREGROUND_FULL_DETAIL_REFRESH_DEDUP_MS)
+      ) {
+        return;
+      }
+
+      lastForegroundRefreshAtRef.current = now;
+      lastPatchAtRef.current = now;

      fetchHourlyForecastForCity(city, { ignoreCache: true, resolution: targetResolution })
        .then((data) => {
@@ -885,6 +969,7 @@ export const __getLiveObservationLabelsForTest = getLiveObservationLabels;
 export const __getObservationDisplayMetricsForTest = getObservationDisplayMetrics;
 export const __getPeakGlowStateForTest = getPeakGlowState;
 export const __getWundergroundDailyHighForTest = getWundergroundDailyHigh;
+export const __getInitialDetailLoadDelayMsForTest = getInitialDetailLoadDelayMs;
 export const __shouldFetchCityDetailForChartForTest = shouldFetchCityDetailForChart;
 export const __shouldPollLiveChartForTest = shouldPollLiveChart;
 export const __mergePatchIntoHourlyForTest = mergePatchIntoHourly;
@@ -1,35 +0,0 @@
-export function TemperatureChartCanvasFallback({ compact }: { compact?: boolean }) {
-  const horizontalLines = compact ? 5 : 7;
-  const verticalLines = compact ? 5 : 8;
-  const minChartHeight = compact === false ? 220 : 120;
-
-  return (
-    <div
-      className="relative flex-1 overflow-hidden rounded-sm border border-slate-100 bg-white"
-      style={{ minHeight: minChartHeight }}
-    >
-      <div className="absolute inset-x-3 bottom-7 top-4 rounded-sm border border-slate-100">
-        {Array.from({ length: horizontalLines }).map((_, index) => (
-          <span
-            key={`h-${index}`}
-            className="absolute left-0 right-0 border-t border-dashed border-sky-100"
-            style={{ top: `${(index / Math.max(1, horizontalLines - 1)) * 100}%` }}
-          />
-        ))}
-        {Array.from({ length: verticalLines }).map((_, index) => (
-          <span
-            key={`v-${index}`}
-            className="absolute bottom-0 top-0 border-l border-dashed border-sky-100"
-            style={{ left: `${(index / Math.max(1, verticalLines - 1)) * 100}%` }}
-          />
-        ))}
-      </div>
-      <div className="absolute inset-0 grid place-items-center">
-        <div className="flex items-center gap-2 rounded border border-slate-200 bg-white px-3 py-2 text-xs font-semibold text-slate-500 shadow-sm">
-          <span className="h-3 w-3 animate-spin rounded-full border-2 border-blue-200 border-t-blue-500" />
-          加载图表
-        </div>
-      </div>
-    </div>
-  );
-}
@@ -1,6 +1,9 @@
 import {
+  CITY_LIST_CACHE_TTL_MS,
  cityListItemsToScanRows,
  mergeScanRowsWithCityFallbackRows,
+  readCachedCityList,
+  writeCachedCityList,
 } from "@/components/dashboard/scan-terminal/city-fallback-rows";
 import type { CityListItem } from "@/lib/dashboard-types";

@@ -47,6 +50,15 @@ export function runTests() {
  ];

  const rows = cityListItemsToScanRows(cities);
+  const cacheStorage = new Map<string, string>();
+  const memoryStorage = {
+    getItem: (key: string) => cacheStorage.get(key) ?? null,
+    removeItem: (key: string) => { cacheStorage.delete(key); },
+    setItem: (key: string, value: string) => { cacheStorage.set(key, value); },
+  };
+
+  writeCachedCityList(cities, memoryStorage, 1_000);
+  const cachedCities = readCachedCityList(memoryStorage, 1_000 + 60_000);

  assert(rows.length === 2, "fallback rows should preserve every city");
  assert(rows[0].id === "city-fallback:taipei", "fallback row id should be stable");
@@ -57,6 +69,12 @@ export function runTests() {
  assert(rows[0].temp_symbol === "°C", "celsius cities should use °C");
  assert(rows[1].trading_region === "north_america", "known cities should keep their configured product region");
  assert(rows[1].temp_symbol === "°F", "fahrenheit cities should use °F");
+  assert(cachedCities?.length === 2, "fresh city registry cache should return the stored city list");
+  assert(cachedCities?.[0]?.name === "taipei", "city registry cache should preserve city payloads");
+  assert(
+    readCachedCityList(memoryStorage, 1_000 + CITY_LIST_CACHE_TTL_MS + 1) === null,
+    "expired city registry cache should be ignored so the dashboard can revalidate",
+  );

  const scanRows = [
    {
@@ -122,10 +140,13 @@ export function runTests() {
  assert(
    dashboardSource.includes("cityListItemsToScanRows") &&
      dashboardSource.includes("STATIC_CITY_LIST") &&
+      dashboardSource.includes("readCachedCityList") &&
+      dashboardSource.includes("writeCachedCityList") &&
      dashboardSource.includes("useState<ScanOpportunityRow[]>(() =>") &&
      dashboardSource.includes("/api/cities") &&
+      dashboardSource.includes('cache: "default"') &&
      dashboardSource.includes("cityFallbackRows"),
-    "terminal dashboard should seed fallback rows from the static city snapshot before refreshing /api/cities",
+    "terminal dashboard should seed fallback rows from cached/static city snapshots and avoid no-store /api/cities fetches when possible",
  );
  assert(fs.existsSync(staticCitiesPath), "/api/cities route should have a static city snapshot fallback");
  assert(
@@ -20,6 +20,7 @@ export function runTests() {
  const cached = buildCityDetailProxyCachePolicy("false", 15);
  assert.equal(cached.fetchMode, "revalidate");
  assert.equal(cached.revalidateSeconds, 15);
+  assert.match(cached.responseCacheControl, /max-age=15/);
  assert.match(cached.responseCacheControl, /s-maxage=15/);

  const scanForced = buildForceRefreshProxyCachePolicy("true", 10);
@@ -55,6 +56,16 @@ export function runTests() {
    /hasDirectBackendApiBaseUrl/,
    "public scan terminal requests should only attach user auth in direct-backend mode so CDN caches can be shared through the Next proxy",
  );
+  assert.match(
+    scanTerminalClientSource,
+    /SCAN_TERMINAL_PAYLOAD_VERSION/,
+    "scan terminal client should include a stable payload version in the URL so CDN caches roll forward after response-shape optimizations",
+  );
+  assert.match(
+    scanTerminalClientSource,
+    /params\.set\("_v",\s*SCAN_TERMINAL_PAYLOAD_VERSION\)/,
+    "scan terminal client should vary the CDN cache key without changing backend scan filters",
+  );

  const overviewProxySource = fs.readFileSync(
    path.join(
@@ -6,6 +6,7 @@ import {
 } from "@/lib/refresh-policy";
 import { scanTerminalQueryPolicy } from "@/components/dashboard/scan-terminal/scan-terminal-client";
 import {
+  __getInitialDetailLoadDelayMsForTest,
  __shouldFetchCityDetailForChartForTest,
  __shouldPollLiveChartForTest,
 } from "@/components/dashboard/scan-terminal/LiveTemperatureThresholdChart";
@@ -71,11 +72,33 @@ export async function runTests() {
      chartSource.includes("2 * 60_000"),
    "selected city chart should consume SSE patches and use a 2-minute no-patch fallback",
  );
+  assert(
+    chartSource.includes("preloadTemperatureChartCanvas"),
+    "terminal chart canvas should expose a preload hook for first-paint optimization",
+  );
+  assert(
+    chartSource.includes('from "@/components/dashboard/scan-terminal/TemperatureChartCanvas"') &&
+      !chartSource.includes("next/dynamic") &&
+      !chartSource.includes("TemperatureChartCanvasFallback"),
+    "terminal chart canvas should be loaded with the terminal route instead of showing a second-stage dynamic chunk fallback",
+  );
+  assert(
+    dashboardSource.includes("preloadTemperatureChartCanvas") &&
+      dashboardSource.includes("void preloadTemperatureChartCanvas()") &&
+      dashboardSource.includes('activeNavKey !== "thresholds"'),
+    "terminal screen should preload the chart chunk once access is confirmed on the chart tab",
+  );
  assert(
    chartSource.includes("fetchHourlyForecastForCity(city, { ignoreCache: true, resolution: targetResolution })") &&
      chartSource.includes("setHourly(data)"),
    "visible chart fallback must refresh the full city detail payload at the current chart resolution when SSE patches stop",
  );
+  assert(
+    chartLogicSource.includes("HOURLY_FORCE_REFRESH_DEDUP_MS") &&
+      chartLogicSource.includes("maxAgeMs: HOURLY_FORCE_REFRESH_DEDUP_MS") &&
+      chartLogicSource.includes("recentlyRefreshed.data"),
+    "forced chart detail refreshes should reuse a very recent full-detail payload instead of refetching repeatedly",
+  );
  assert(
    __shouldPollLiveChartForTest({ city: "shanghai", compact: true, isActive: false, isMaximized: false }) === true,
    "compact grid slots are visible charts and should run the no-patch fallback guard",
@@ -96,6 +119,15 @@ export async function runTests() {
      chartLogicSource.includes("primeCityDetailCache"),
    "visible terminal chart detail fetches should be coalesced into one batch request and prime the shared chart cache",
  );
+  assert(
+    chartLogicSource.includes('scope: "chart"') &&
+      chartLogicSource.includes("params.toString()"),
+    "terminal chart detail batches should request the slim chart scope instead of the full city detail payload",
+  );
+  assert(
+    chartLogicSource.includes("CITY_DETAIL_BATCH_WINDOW_MS = 100"),
+    "visible terminal chart detail fetches should use a wide enough batch window to coalesce cards mounted across adjacent frames",
+  );
  assert(
    chartLogicSource.includes("partial?: boolean") &&
      chartLogicSource.includes("missing?: string[]"),
@@ -108,11 +140,17 @@ export async function runTests() {
      flushCityDetailBatchBlock.includes("payload?.partial === true"),
    "partial detail-batch misses should resolve without immediately issuing single-city fallback requests",
  );
-  const fetchHourlyBlock = chartLogicSource.match(/async function fetchHourlyForecastForCity[\s\S]*?\r?\n}\r?\n\r?\nfunction fetchCityDetailWithTimeout/)?.[0] || "";
+  assert(
+    flushCityDetailBatchBlock.includes("if (!payload)") &&
+      flushCityDetailBatchBlock.includes("resolveAllBatchWaitersAsNull") &&
+      !flushCityDetailBatchBlock.includes("resolveCityDetailBatchWithSingleFallback"),
+    "whole-batch failures should stop at the chart batch layer instead of fanning out into single-city full-detail requests",
+  );
+  const fetchHourlyBlock = chartLogicSource.match(/async function fetchHourlyForecastForCity[\s\S]*?\r?\n}\r?\n\r?\nfunction shouldPollLiveChart/)?.[0] || "";
  assert(
    fetchHourlyBlock.includes("queueCityDetailBatch(city, resParam)") &&
      !fetchHourlyBlock.includes("runQueuedHourlyDetailRequest"),
-    "first-paint and background city detail refreshes should both enter the batch queue before falling back to single requests",
+    "first-paint and background city detail refreshes should both enter the batch queue without falling back to single requests",
  );
  assert(
    dashboardSource.includes("ONLINE_USERS_REFRESH_MS = 5 * 60_000") &&
@@ -125,6 +163,11 @@ export async function runTests() {
      chartSource.includes("isChartVisible"),
    "city detail prefetch should be gated to visible chart cards instead of every mounted slot",
  );
+  assert(
+    chartSource.includes("DETAIL_LOAD_BATCH_DELAY_MS") &&
+      !chartSource.includes("slotIndex ? 300 + slotIndex * 250"),
+    "visible chart detail loads should enter the batch queue together instead of being staggered into single-city requests",
+  );
  assert(
    chartSource.includes("allowStale: true") &&
      chartCanvasSourceIncludes(chartSource, "数据暂不可用") &&
@@ -143,6 +186,58 @@ export async function runTests() {
    __shouldFetchCityDetailForChartForTest({ city: "paris", documentHidden: true, isChartVisible: true }) === false,
    "hidden browser tabs should not prefetch city detail",
  );
+  assert(
+    __getInitialDetailLoadDelayMsForTest({ compact: true, isActive: false, isMaximized: false, slotIndex: 0 }) === 0 &&
+      __getInitialDetailLoadDelayMsForTest({ compact: true, isActive: false, isMaximized: false, slotIndex: 2 }) === 0,
+    "first visible grid charts should fetch full detail immediately",
+  );
+  assert(
+    __getInitialDetailLoadDelayMsForTest({ compact: true, isActive: false, isMaximized: false, slotIndex: 3 }) > 0,
+    "later non-active grid charts should defer full-detail loading after first paint",
+  );
+  assert(
+    __getInitialDetailLoadDelayMsForTest({ compact: true, isActive: false, isMaximized: false, slotIndex: 3 }) ===
+      __getInitialDetailLoadDelayMsForTest({ compact: true, isActive: false, isMaximized: false, slotIndex: 5 }),
+    "deferred grid charts should load in same-wave groups so detail-batch can coalesce them",
+  );
+  assert(
+    __getInitialDetailLoadDelayMsForTest({ compact: true, isActive: false, isMaximized: false, slotIndex: 6 }) ===
+      __getInitialDetailLoadDelayMsForTest({ compact: true, isActive: false, isMaximized: false, slotIndex: 8 }) &&
+      __getInitialDetailLoadDelayMsForTest({ compact: true, isActive: false, isMaximized: false, slotIndex: 6 }) >
+        __getInitialDetailLoadDelayMsForTest({ compact: true, isActive: false, isMaximized: false, slotIndex: 5 }),
+    "later deferred grid charts should form a second batch wave instead of one request per slot",
+  );
+  assert(
+    __getInitialDetailLoadDelayMsForTest({ compact: true, isActive: true, isMaximized: false, slotIndex: 8 }) === 0 &&
+      __getInitialDetailLoadDelayMsForTest({ compact: true, isActive: false, isMaximized: true, slotIndex: 8 }) === 0,
+    "active or maximized charts should bypass deferred detail loading",
+  );
+  assert(
+    __shouldFetchCityDetailForChartForTest({
+      city: "paris",
+      documentHidden: false,
+      isChartVisible: true,
+      compact: true,
+      isActive: false,
+      isMaximized: false,
+      slotIndex: 5,
+      detailLoadReady: false,
+    }) === false,
+    "deferred grid charts should not enter the detail request queue before their delay is ready",
+  );
+  assert(
+    __shouldFetchCityDetailForChartForTest({
+      city: "paris",
+      documentHidden: false,
+      isChartVisible: true,
+      compact: true,
+      isActive: false,
+      isMaximized: false,
+      slotIndex: 5,
+      detailLoadReady: true,
+    }) === true,
+    "deferred grid charts should fetch detail after their delay is ready",
+  );
  const normalizedBatchDetail = __resolveCityDetailFromBatchForTest(
      {
        "hong kong": {
@@ -94,11 +94,30 @@ export function runTests() {
  assert(hook.includes("subscribedCities"), "frontend patch hook must track the visible city subscription set");
  assert(hook.includes("since_revision"), "frontend patch hook must reconnect with since_revision");
  assert(hook.includes("resync_required"), "frontend patch hook must react to server resync_required events");
+  assert(
+    hook.includes("SSE_REPLAY_EVENTS_PER_CITY") &&
+      hook.includes("resolveSseReplayLimit") &&
+      hook.includes('params.set("replay_limit", String(resolveSseReplayLimit(cities.length)))') &&
+      !hook.includes('params.set("replay_limit", "500")'),
+    "frontend patch hook should size SSE replay_limit by visible city count instead of always asking for 500 events",
+  );
  assert(hook.includes("lastRevision"), "frontend patch hook must track the global last processed revision");
  assert(hook.includes("Map<"), "frontend patch hook must keep latest patches in a Map");
  assert(hook.includes("useLatestPatch"), "frontend patch hook must export useLatestPatch(city)");
  assert(hook.includes("revision"), "frontend patch hook must track revisions and skip stale patches");
  assert(hook.includes("setTimeout"), "frontend patch hook must implement explicit reconnect backoff");
+  assert(
+    hook.includes("SSE_SUBSCRIPTION_RECONNECT_DELAY_MS") &&
+      hook.includes("scheduleSubscriptionReconnect") &&
+      hook.includes("clearSubscriptionReconnectTimer"),
+    "frontend patch hook must debounce visible-city subscription changes before reopening SSE",
+  );
+  const subscriptionBlock = hook.match(/function registerCitySubscription[\s\S]*?\n}\r?\n\r?\nfunction normalizeLegacyPatch/)?.[0] || "";
+  assert(
+    subscriptionBlock.includes("scheduleSubscriptionReconnect()") &&
+      !subscriptionBlock.includes("ensureSsePatchConnection();"),
+    "city subscription mount/unmount should schedule one coalesced SSE reconnect instead of reconnecting per chart",
+  );

  const bffEventsRoute = readFrontendFile("app", "api", "events", "route.ts");
  assert(bffEventsRoute.includes("searchParams"), "Next.js SSE proxy must forward query parameters to FastAPI");
@@ -179,8 +198,9 @@ export function runTests() {
  assert(
    foregroundRefreshBlock.includes("ignoreCache: true") &&
      foregroundRefreshBlock.includes("fetchHourlyForecastForCity") &&
+      foregroundRefreshBlock.includes("FOREGROUND_FULL_DETAIL_REFRESH_DEDUP_MS") &&
      !foregroundRefreshBlock.includes("setIsHourlyLoading(true)"),
-    "foreground resume refresh should update full detail immediately in the background without showing the loading overlay",
+    "foreground resume refresh should update full detail in the background without showing the loading overlay or refetching fresh detail",
  );
  assert(
    !chart.includes("/api/city/${encodeURIComponent(city)}/summary"),
@@ -239,7 +259,7 @@ export function runTests() {
  );
  assert(
    chartLogic.includes("HOURLY_DETAIL_REQUEST_TIMEOUT_MS = 12_000") &&
-      chartLogic.includes("fetchCityDetailWithTimeout") &&
+      chartLogic.includes("fetchCityDetailBatchWithTimeout") &&
      chartLogic.includes("signal: controller.signal") &&
      chartLogic.includes("controller.abort()"),
    "city detail chart fetches must have a frontend timeout so panels cannot stay on 加载图表 forever",
@@ -124,6 +124,45 @@ export async function runTests() {
    "terminal auth bootstrap should accept an authenticated cookie profile immediately",
  );

+  const slowDegradedSession = deferred<{ data: { session: { access_token: string } | null } }>();
+  const timedCookieResult = await loadTerminalAuthProfile({
+    hasSupabasePublicEnv: true,
+    getSession: () => slowDegradedSession.promise,
+    timeoutMs: 1,
+    loadAuthProfile: (accessToken) => {
+      assert(!accessToken, "timeout fallback should use the settled cookie profile when bearer session is still pending");
+      return Promise.resolve({
+        authenticated: true,
+        user_id: "cookie-user",
+        subscription_active: null,
+        degraded_auth_profile: true,
+      });
+    },
+  });
+  assert(
+    timedCookieResult.user_id === "cookie-user" &&
+      timedCookieResult.subscription_active === null,
+    "terminal auth bootstrap timeout must resolve with a known degraded cookie profile instead of spinning forever",
+  );
+
+  const neverCookie = deferred<TerminalAuthProfilePayload>();
+  const neverSession = deferred<{ data: { session: { access_token: string } | null } }>();
+  let timeoutRejected = false;
+  try {
+    await loadTerminalAuthProfile({
+      hasSupabasePublicEnv: true,
+      getSession: () => neverSession.promise,
+      timeoutMs: 1,
+      loadAuthProfile: () => neverCookie.promise,
+    });
+  } catch (error) {
+    timeoutRejected = String(error).includes("Terminal auth bootstrap timeout");
+  }
+  assert(
+    timeoutRejected,
+    "terminal auth bootstrap must reject instead of leaving the loading screen unresolved when no profile request settles",
+  );
+
  const delayedBearerSession = deferred<{ data: { session: { access_token: string } } }>();
  let coldStartSettled = false;
  const coldStartResultPromise = loadTerminalAuthProfile({
@@ -97,11 +97,10 @@ export function runTests() {
    "terminal dashboard must lazy-load the training analytics tab so Recharts stays out of the default terminal path",
  );
  assert(
-    chartSource.includes('from "next/dynamic"') &&
-      chartSource.includes("TemperatureChartCanvasFallback") &&
-      chartSource.includes("import(\"@/components/dashboard/scan-terminal/TemperatureChartCanvas\")") &&
-      !chartSource.includes('import { TemperatureChartCanvas } from "@/components/dashboard/scan-terminal/TemperatureChartCanvas";'),
-    "terminal temperature charts must lazy-load the Recharts canvas behind a lightweight fallback",
+    chartSource.includes('import { TemperatureChartCanvas } from "@/components/dashboard/scan-terminal/TemperatureChartCanvas";') &&
+      !chartSource.includes("TemperatureChartCanvasFallback") &&
+      !chartSource.includes("import(\"@/components/dashboard/scan-terminal/TemperatureChartCanvas\")"),
+    "terminal temperature charts must load the Recharts canvas with the terminal route so visible cards do not sit behind a second-stage fallback",
  );
  assert(
    chartSource.includes("setLiveTemp(null);") &&
@@ -5,10 +5,61 @@ import {
  type RegionKey,
 } from "@/components/dashboard/scan-terminal/continent-grouping";

+const CITY_LIST_CACHE_KEY = "polyweather_city_list_v1";
+export const CITY_LIST_CACHE_TTL_MS = 24 * 60 * 60 * 1000;
+
+type CityListCacheStorage = Pick<Storage, "getItem" | "removeItem" | "setItem">;
+
 function normalizeCityKey(value: string) {
  return String(value || "").trim().toLowerCase();
 }

+function getCityListCacheStorage(storage?: CityListCacheStorage): CityListCacheStorage | null {
+  if (storage) return storage;
+  if (typeof window === "undefined") return null;
+  try {
+    return window.localStorage;
+  } catch {
+    return null;
+  }
+}
+
+export function readCachedCityList(
+  storage?: CityListCacheStorage,
+  now = Date.now(),
+): CityListItem[] | null {
+  const cacheStorage = getCityListCacheStorage(storage);
+  if (!cacheStorage) return null;
+  try {
+    const raw = cacheStorage.getItem(CITY_LIST_CACHE_KEY);
+    if (!raw) return null;
+    const cached = JSON.parse(raw);
+    const age = now - Number(cached.ts || 0);
+    if (age < 0 || age >= CITY_LIST_CACHE_TTL_MS || !Array.isArray(cached.cities)) {
+      return null;
+    }
+    return cached.cities as CityListItem[];
+  } catch {
+    try { cacheStorage.removeItem(CITY_LIST_CACHE_KEY); } catch {}
+  }
+  return null;
+}
+
+export function writeCachedCityList(
+  cities: CityListItem[],
+  storage?: CityListCacheStorage,
+  now = Date.now(),
+) {
+  const cacheStorage = getCityListCacheStorage(storage);
+  if (!cacheStorage || !Array.isArray(cities) || !cities.length) return;
+  try {
+    cacheStorage.setItem(
+      CITY_LIST_CACHE_KEY,
+      JSON.stringify({ ts: now, cities }),
+    );
+  } catch {}
+}
+
 function tempSymbolForCity(city: CityListItem) {
  return city.temp_unit === "fahrenheit" ? "°F" : "°C";
 }
@@ -22,6 +22,7 @@ export const scanTerminalQueryPolicy = {
  autoRefreshMs: null,
  manualForceRefreshCooldownMs: 2 * 60_000,
 } as const;
+const SCAN_TERMINAL_PAYLOAD_VERSION = "runway-slim-v1";

 type TerminalQueryOptions = {
  forceRefresh?: boolean;
@@ -142,6 +143,7 @@ async function getTerminal({
  if (Number.isFinite(timezoneOffsetSeconds)) {
    params.set("timezone_offset_seconds", String(Math.trunc(Number(timezoneOffsetSeconds))));
  }
+  params.set("_v", SCAN_TERMINAL_PAYLOAD_VERSION);
  if (forceRefresh) {
    params.set("_ts", String(Date.now()));
  }
@@ -353,6 +353,7 @@ type LocalDayBounds = { start: number; end: number };

 const MAX_OBS_POINTS = 1440;
 const HOURLY_CACHE_TTL_MS = DASHBOARD_REFRESH_POLICY_MS.metar;
+const HOURLY_FORCE_REFRESH_DEDUP_MS = 60_000;
 const _hourlyCache = new Map<string, { ts: number; data: HourlyForecast }>();
 const _hourlyRequestCache = new Map<string, Promise<HourlyForecast>>();
 const MAX_HOURLY_DETAIL_CONCURRENT_REQUESTS = 3;
@@ -366,13 +367,16 @@ const SESSION_CACHE_TTL_MS = DASHBOARD_REFRESH_POLICY_MS.metar;

 type HourlyCacheEntry = { ts: number; data: HourlyForecast };

-function isFreshHourlyCacheEntry(entry: HourlyCacheEntry | null | undefined) {
-  return Boolean(entry && Date.now() - Number(entry.ts || 0) < SESSION_CACHE_TTL_MS);
+function isFreshHourlyCacheEntry(
+  entry: HourlyCacheEntry | null | undefined,
+  maxAgeMs = SESSION_CACHE_TTL_MS,
+) {
+  return Boolean(entry && Date.now() - Number(entry.ts || 0) < maxAgeMs);
 }

 function readSessionCache(
  city: string,
-  options: { allowStale?: boolean } = {},
+  options: { allowStale?: boolean; maxAgeMs?: number } = {},
 ): HourlyCacheEntry | null {
  if (typeof window === "undefined") return null;
  try {
@@ -382,7 +386,7 @@ function readSessionCache(
    if (
      item &&
      item.ts &&
-      (options.allowStale || Date.now() - item.ts < SESSION_CACHE_TTL_MS)
+      (options.allowStale || Date.now() - item.ts < (options.maxAgeMs ?? SESSION_CACHE_TTL_MS))
    ) {
      return item;
    }
@@ -392,10 +396,10 @@ function readSessionCache(

 function readHourlyCacheEntry(
  cacheKey: string,
-  options: { allowStale?: boolean } = {},
+  options: { allowStale?: boolean; maxAgeMs?: number } = {},
 ): HourlyCacheEntry | null {
  const cached = _hourlyCache.get(cacheKey);
-  if (cached && (options.allowStale || isFreshHourlyCacheEntry(cached))) {
+  if (cached && (options.allowStale || isFreshHourlyCacheEntry(cached, options.maxAgeMs))) {
    return cached;
  }

@@ -984,7 +988,7 @@ type CityDetailBatchQueue = {
  timer: ReturnType<typeof setTimeout> | null;
 };

-const CITY_DETAIL_BATCH_WINDOW_MS = 25;
+const CITY_DETAIL_BATCH_WINDOW_MS = 100;
 const CITY_DETAIL_BATCH_MAX_CITIES = 12;
 const _cityDetailBatchQueues = new Map<string, CityDetailBatchQueue>();

@@ -1029,16 +1033,6 @@ function primeCityDetailCache(
  return data;
 }

-async function fetchSingleHourlyForecastForCity(
-  city: string,
-  resolution: string,
-): Promise<HourlyForecast> {
-  const res = await fetchCityDetailWithTimeout(city, resolution);
-  if (!res || !res.ok) return null;
-  const json = await res.json() as CityDetail;
-  return primeCityDetailCache(city, resolution, json);
-}
-
 function queueCityDetailBatch(city: string, resolution: string): Promise<HourlyForecast> {
  return new Promise<HourlyForecast>((resolve, reject) => {
    const queue = _cityDetailBatchQueues.get(resolution) || {
@@ -1069,13 +1063,6 @@ function resolveBatchWaiters(
  (waiters || []).forEach((waiter) => waiter.resolve(value));
 }

-function rejectBatchWaiters(
-  waiters: CityDetailBatchWaiter[] | undefined,
-  reason: unknown,
-) {
-  (waiters || []).forEach((waiter) => waiter.reject(reason));
-}
-
 function resolveCityDetailFromBatch(
  details: Record<string, CityDetail | null | undefined> | undefined,
  city: string,
@@ -1114,6 +1101,11 @@ async function flushCityDetailBatch(resolution: string) {

  try {
    const payload = await fetchCityDetailBatchWithTimeout(cities, resolution);
+    if (!payload) {
+      resolveAllBatchWaitersAsNull(cities, queue);
+      return;
+    }
+
    const details = payload?.details || {};
    const partialMissingCities =
      payload?.partial === true
@@ -1132,33 +1124,23 @@ async function flushCityDetailBatch(resolution: string) {
          resolveBatchWaiters(waiters, null);
          return;
        }
-        try {
-          resolveBatchWaiters(
-            waiters,
-            await runQueuedHourlyDetailRequest(() => fetchSingleHourlyForecastForCity(city, resolution)),
-          );
-        } catch (error) {
-          rejectBatchWaiters(waiters, error);
-        }
+        resolveBatchWaiters(waiters, null);
      }),
    );
  } catch (error) {
-    await Promise.all(
-      cities.map(async (city) => {
-        const waiters = queue.waiters.get(city);
-        try {
-          resolveBatchWaiters(
-            waiters,
-            await runQueuedHourlyDetailRequest(() => fetchSingleHourlyForecastForCity(city, resolution)),
-          );
-        } catch (fallbackError) {
-          rejectBatchWaiters(waiters, fallbackError || error);
-        }
-      }),
-    );
+    resolveAllBatchWaitersAsNull(cities, queue);
  }
 }

+function resolveAllBatchWaitersAsNull(
+  cities: string[],
+  queue: CityDetailBatchQueue,
+) {
+  cities.forEach((city) => {
+    resolveBatchWaiters(queue.waiters.get(city), null);
+  });
+}
+
 function fetchCityDetailBatchWithTimeout(cities: string[], resolution: string) {
  const controller = new AbortController();
  const timeoutId = globalThis.setTimeout(() => controller.abort(), HOURLY_DETAIL_REQUEST_TIMEOUT_MS);
@@ -1168,6 +1150,7 @@ function fetchCityDetailBatchWithTimeout(cities: string[], resolution: string) {
    force_refresh: "false",
    limit: String(Math.max(cities.length, CITY_DETAIL_BATCH_MAX_CITIES)),
    resolution,
+    scope: "chart",
  });
  return fetch(`/api/cities/detail-batch?${params.toString()}`, {
    headers: { Accept: "application/json" },
@@ -1193,6 +1176,13 @@ async function fetchHourlyForecastForCity(
    if (cached) {
      return cached.data;
    }
+  } else {
+    const recentlyRefreshed = readHourlyCacheEntry(cacheKey, {
+      maxAgeMs: HOURLY_FORCE_REFRESH_DEDUP_MS,
+    });
+    if (recentlyRefreshed) {
+      return recentlyRefreshed.data;
+    }
  }

  const requestKey = options.ignoreCache ? `${city}:${resParam}:live` : `${city}:${resParam}`;
@@ -1208,17 +1198,6 @@ async function fetchHourlyForecastForCity(
  return request;
 }

-function fetchCityDetailWithTimeout(city: string, resolution: string) {
-  const controller = new AbortController();
-  const timeoutId = globalThis.setTimeout(() => controller.abort(), HOURLY_DETAIL_REQUEST_TIMEOUT_MS);
-  return fetch(`/api/city/${encodeURIComponent(city)}/detail?depth=full&force_refresh=false&resolution=${resolution}`, {
-    headers: { Accept: "application/json" },
-    signal: controller.signal,
-  })
-    .catch(() => null)
-    .finally(() => globalThis.clearTimeout(timeoutId));
-}
-
 function shouldPollLiveChart({
  city,
  compact,
@@ -2459,6 +2438,7 @@ export {
  MAX_HOURLY_DETAIL_CONCURRENT_REQUESTS,
  HOURLY_DETAIL_REQUEST_TIMEOUT_MS,
  HOURLY_CACHE_TTL_MS,
+  HOURLY_FORCE_REFRESH_DEDUP_MS,
  _hourlyCache,
  __readHourlyCacheEntryForTest,
  resolveCityDetailFromBatch as __resolveCityDetailFromBatchForTest,
@@ -17,6 +17,7 @@ type LoadTerminalAuthProfileOptions = {
    accessToken?: string | null,
    options?: { preferSnapshot?: boolean },
  ) => Promise<TerminalAuthProfilePayload>;
+  timeoutMs?: number;
 };

 type SettledProfile =
@@ -87,11 +88,14 @@ export async function loadTerminalAuthProfile({
  getSession,
  hasSupabasePublicEnv,
  loadAuthProfile,
+  timeoutMs = 6500,
 }: LoadTerminalAuthProfileOptions) {
  let resolvedAuthenticated = false;
  let resolveAuthenticated:
    | ((payload: TerminalAuthProfilePayload) => void)
    | null = null;
+  let latestCookiePayload: TerminalAuthProfilePayload | null = null;
+  let latestBearerPayload: TerminalAuthProfilePayload | null = null;

  const authenticatedProfile = new Promise<TerminalAuthProfilePayload>((resolve) => {
    resolveAuthenticated = resolve;
@@ -105,6 +109,7 @@ export async function loadTerminalAuthProfile({

  const cookieProfile = settleProfile(
    loadAuthProfile(null, { preferSnapshot: true }).then((payload) => {
+      latestCookiePayload = payload;
      resolveIfAuthenticated(payload);
      return payload;
    }),
@@ -120,6 +125,7 @@ export async function loadTerminalAuthProfile({
      ).trim();
      if (!accessToken) return null;
      const payload = await loadAuthProfile(accessToken, { preferSnapshot: true });
+      latestBearerPayload = payload;
      resolveIfAuthenticated(payload);
      return payload;
    })(),
@@ -129,5 +135,20 @@ export async function loadTerminalAuthProfile({
    ([cookieResult, bearerResult]) => firstKnownProfile(cookieResult, bearerResult),
  );

-  return Promise.race([authenticatedProfile, fallbackProfile]);
+  const timeoutProfile = new Promise<TerminalAuthProfilePayload>((resolve, reject) => {
+    if (!Number.isFinite(timeoutMs) || timeoutMs <= 0) return;
+    globalThis.setTimeout(() => {
+      if (latestBearerPayload) {
+        resolve(latestBearerPayload);
+        return;
+      }
+      if (latestCookiePayload) {
+        resolve(latestCookiePayload);
+        return;
+      }
+      reject(new Error("Terminal auth bootstrap timeout"));
+    }, timeoutMs);
+  });
+
+  return Promise.race([authenticatedProfile, fallbackProfile, timeoutProfile]);
 }
@@ -4,6 +4,10 @@ import { useEffect, useSyncExternalStore } from "react";
 import { resolveBackendApiUrl } from "@/lib/backend-api";

 const V1_EVENT_TYPE = "city_observation_patch.v1";
+const SSE_SUBSCRIPTION_RECONNECT_DELAY_MS = 150;
+const SSE_REPLAY_BASE_LIMIT = 60;
+const SSE_REPLAY_EVENTS_PER_CITY = 24;
+const SSE_REPLAY_MAX_LIMIT = 240;

 export type CityPatch = {
  type?: string;
@@ -38,6 +42,7 @@ const subscribedCities = new Map<string, number>();

 let eventSource: EventSource | null = null;
 let reconnectTimer: ReturnType<typeof setTimeout> | null = null;
+let subscriptionReconnectTimer: ReturnType<typeof setTimeout> | null = null;
 let reconnectAttempt = 0;
 let patchVersion = 0;
 let resyncVersion = 0;
@@ -74,6 +79,12 @@ function clearReconnectTimer() {
  reconnectTimer = null;
 }

+function clearSubscriptionReconnectTimer() {
+  if (!subscriptionReconnectTimer) return;
+  clearTimeout(subscriptionReconnectTimer);
+  subscriptionReconnectTimer = null;
+}
+
 function buildSseUrl(baseUrl: string) {
  const params = new URLSearchParams();
  const cities = subscribedCityList();
@@ -83,12 +94,17 @@ function buildSseUrl(baseUrl: string) {
  if (lastRevision > 0) {
    params.set("since_revision", String(lastRevision));
  }
-  params.set("replay_limit", "500");
+  params.set("replay_limit", String(resolveSseReplayLimit(cities.length)));

  const query = params.toString();
  return query ? `${baseUrl}?${query}` : baseUrl;
 }

+function resolveSseReplayLimit(cityCount: number) {
+  const requested = Math.max(1, cityCount) * SSE_REPLAY_EVENTS_PER_CITY;
+  return Math.max(SSE_REPLAY_BASE_LIMIT, Math.min(SSE_REPLAY_MAX_LIMIT, requested));
+}
+
 function currentConnectionKey() {
  return `${useFallbackUrl ? "fallback" : "direct"}:${subscribedCityList().join("|")}:${lastRevision}`;
 }
@@ -113,6 +129,7 @@ function closeEventSource() {
 function reconnectNow() {
  if (typeof window === "undefined") return;
  clearReconnectTimer();
+  clearSubscriptionReconnectTimer();
  closeEventSource();
  connectSsePatches();
 }
@@ -159,6 +176,7 @@ function connectSsePatches() {

 function ensureSsePatchConnection() {
  if (subscribedCities.size === 0) {
+    clearSubscriptionReconnectTimer();
    closeEventSource();
    clearReconnectTimer();
    return;
@@ -167,6 +185,19 @@ function ensureSsePatchConnection() {
  reconnectNow();
 }

+function scheduleSubscriptionReconnect() {
+  if (typeof window === "undefined") return;
+  if (subscribedCities.size === 0) {
+    ensureSsePatchConnection();
+    return;
+  }
+  clearSubscriptionReconnectTimer();
+  subscriptionReconnectTimer = setTimeout(() => {
+    subscriptionReconnectTimer = null;
+    ensureSsePatchConnection();
+  }, SSE_SUBSCRIPTION_RECONNECT_DELAY_MS);
+}
+
 function registerCitySubscription(city: string) {
  const cityKey = normalizeCityKey(city);
  if (!cityKey) return () => {};
@@ -174,7 +205,7 @@ function registerCitySubscription(city: string) {
  const previousCount = subscribedCities.get(cityKey) ?? 0;
  subscribedCities.set(cityKey, previousCount + 1);
  if (previousCount === 0) {
-    ensureSsePatchConnection();
+    scheduleSubscriptionReconnect();
  }

  return () => {
@@ -184,7 +215,7 @@ function registerCitySubscription(city: string) {
    } else {
      subscribedCities.set(cityKey, nextCount);
    }
-    ensureSsePatchConnection();
+    scheduleSubscriptionReconnect();
  };
 }

@@ -28,4 +28,22 @@ export function buildForceRefreshProxyCachePolicy(
  };
 }

-export const buildCityDetailProxyCachePolicy = buildForceRefreshProxyCachePolicy;
+export function buildCityDetailProxyCachePolicy(
+  forceRefresh: string | null | undefined,
+  revalidateSeconds = 15,
+): ProxyCachePolicy {
+  if (isForceRefreshValue(forceRefresh)) {
+    return {
+      fetchMode: "no-store",
+      responseCacheControl: "no-store, max-age=0",
+    };
+  }
+  return {
+    fetchMode: "revalidate",
+    responseCacheControl: `public, max-age=${revalidateSeconds}, s-maxage=${revalidateSeconds}, stale-while-revalidate=${Math.max(
+      revalidateSeconds * 3,
+      30,
+    )}`,
+    revalidateSeconds,
+  };
+}
@@ -23,6 +23,10 @@ def test_backend_shared_timing_helper_avoids_sensitive_identity_fields():


 def test_city_detail_batch_response_includes_backend_server_timing(monkeypatch):
+    city_api._CITY_DETAIL_BATCH_RESPONSE_CACHE.clear()
+    city_api._CITY_DETAIL_BATCH_RESPONSE_CACHE_TS.clear()
+    city_api._CITY_DETAIL_BATCH_RESPONSE_INFLIGHT.clear()
+
    class FakeCache:
        def get_city_cache(self, kind, city):
            assert kind == "full"
@@ -38,15 +38,49 @@ def test_scan_terminal_prewarm_is_lazy_by_default():
    )


+def test_scan_terminal_prewarm_only_runs_for_web_service(monkeypatch):
+    from web import app_factory
+
+    monkeypatch.setenv("POLYWEATHER_SCAN_TERMINAL_PREWARM_ENABLED", "true")
+    monkeypatch.delenv("POLYWEATHER_SERVICE_ROLE", raising=False)
+    assert app_factory._scan_terminal_prewarm_enabled() is False
+
+    monkeypatch.setenv("POLYWEATHER_SERVICE_ROLE", "bot")
+    assert app_factory._scan_terminal_prewarm_enabled() is False
+
+    monkeypatch.setenv("POLYWEATHER_SERVICE_ROLE", "web")
+    assert app_factory._scan_terminal_prewarm_enabled() is True
+
+
+def test_docker_compose_isolates_scan_terminal_prewarm_to_web_service():
+    compose = (ROOT / "docker-compose.yml").read_text(encoding="utf-8")
+
+    assert "POLYWEATHER_SERVICE_ROLE: web" in compose
+    assert "POLYWEATHER_SERVICE_ROLE: bot" in compose
+    assert "POLYWEATHER_SCAN_TERMINAL_PREWARM_ENABLED: 'false'" in compose
+
+
 def test_scan_terminal_backend_timeout_returns_before_next_proxy_abort():
    import web.services.scan_terminal_config as scan_terminal_config

    route_source = (
        ROOT / "frontend" / "app" / "api" / "scan" / "terminal" / "route.ts"
    ).read_text(encoding="utf-8")
+    config_source = (
+        ROOT / "web" / "services" / "scan_terminal_config.py"
+    ).read_text(encoding="utf-8")

-    assert 'POLYWEATHER_SCAN_TERMINAL_PROXY_TIMEOUT_MS || "40000"' in route_source
+    assert 'POLYWEATHER_SCAN_TERMINAL_PROXY_TIMEOUT_MS || "18000"' in route_source
+    assert '"POLYWEATHER_SCAN_TERMINAL_BUILD_TIMEOUT_SEC",\n    10,' in config_source
+    assert (
+        '"POLYWEATHER_SCAN_TERMINAL_PREWARM_PAYLOAD_TIMEOUT_SEC",\n    30,'
+        in config_source
+    )
    assert scan_terminal_config.SCAN_TERMINAL_BUILD_TIMEOUT_SEC <= 30
+    assert (
+        scan_terminal_config.SCAN_TERMINAL_PREWARM_PAYLOAD_TIMEOUT_SEC
+        >= scan_terminal_config.SCAN_TERMINAL_BUILD_TIMEOUT_SEC
+    )


 def test_probability_engine_uses_enriched_multi_model_snapshot():
@@ -1,12 +1,84 @@
 from web.scan_terminal_filters import normalize_scan_terminal_filters
+from web import scan_terminal_cache
 from web.scan_terminal_metar_gate import _apply_metar_gate_to_row
 from web.scan_terminal_payloads import (
    build_failed_scan_terminal_payload,
    build_scan_terminal_snapshot_id,
    build_stale_scan_terminal_payload,
+    compact_ranked_scan_rows_for_payload,
+    SCAN_PAYLOAD_DEFERRED_RUNWAY_POINTS,
+    SCAN_PAYLOAD_FULL_RUNWAY_HISTORY_ROWS,
 )
 from web.scan_terminal_ranker import build_ranked_scan_terminal_result
+from web.scan_terminal_city_row import _build_quick_row
 from web.routers.scan import router as scan_router
+from web.scan_terminal_service import _scan_terminal_prewarm_filters
+
+
+class _FakeRedis:
+    def __init__(self):
+        self.data = {}
+
+    def get(self, key):
+        return self.data.get(key)
+
+    def setex(self, key, _ttl, value):
+        self.data[key] = value
+
+
+def test_scan_terminal_cache_hydrates_success_payload_from_redis(monkeypatch):
+    fake_redis = _FakeRedis()
+    monkeypatch.setenv("POLYWEATHER_SCAN_TERMINAL_REDIS_CACHE_ENABLED", "true")
+    monkeypatch.setattr(scan_terminal_cache, "_get_redis_client", lambda: fake_redis)
+    scan_terminal_cache._SCAN_TERMINAL_CACHE.clear()
+
+    filters = {"scan_mode": "tradable", "limit": 9}
+    payload = {
+        "generated_at": "2026-06-01T00:00:00Z",
+        "rows": [{"id": "row-1"}],
+        "summary": {"candidate_total": 1},
+    }
+
+    scan_terminal_cache.set_cached_scan_terminal_payload(filters, payload)
+    scan_terminal_cache._SCAN_TERMINAL_CACHE.clear()
+
+    entry = scan_terminal_cache.get_scan_terminal_cache_entry(filters)
+    cached = scan_terminal_cache.get_cached_scan_terminal_payload(filters, ttl_sec=3600)
+
+    assert entry["success_payload"]["rows"] == [{"id": "row-1"}]
+    assert cached["summary"]["candidate_total"] == 1
+
+
+def test_scan_terminal_failure_state_preserves_redis_success_payload(monkeypatch):
+    fake_redis = _FakeRedis()
+    monkeypatch.setenv("POLYWEATHER_SCAN_TERMINAL_REDIS_CACHE_ENABLED", "true")
+    monkeypatch.setattr(scan_terminal_cache, "_get_redis_client", lambda: fake_redis)
+    scan_terminal_cache._SCAN_TERMINAL_CACHE.clear()
+
+    filters = {"scan_mode": "tradable", "limit": 9}
+    scan_terminal_cache.set_cached_scan_terminal_payload(
+        filters,
+        {
+            "generated_at": "2026-06-01T00:00:00Z",
+            "rows": [{"id": "row-1"}],
+        },
+    )
+    scan_terminal_cache._SCAN_TERMINAL_CACHE.clear()
+
+    scan_terminal_cache.set_scan_terminal_failure_state(filters, error_message="timeout")
+    scan_terminal_cache._SCAN_TERMINAL_CACHE.clear()
+
+    entry = scan_terminal_cache.get_scan_terminal_cache_entry(filters)
+
+    assert entry["success_payload"]["rows"] == [{"id": "row-1"}]
+    assert entry["last_error"] == "timeout"
+
+
+def test_scan_terminal_prewarm_covers_default_api_limit():
+    limits = {filters["limit"] for filters in _scan_terminal_prewarm_filters()}
+
+    assert 25 in limits
+    assert 180 in limits


 def test_scan_router_does_not_expose_terminal_ai_endpoint():
@@ -137,6 +209,78 @@ def test_scan_terminal_snapshot_id_is_stable_for_same_ranked_inputs():
    assert first.startswith("scan-")


+def test_scan_terminal_payload_slims_deferred_runway_history_rows():
+    runway_points = [
+        {"time": f"2026-05-31T{hour:02d}:00:00+00:00", "temp": 20 + hour}
+        for hour in range(24)
+    ]
+    rows = [
+        {
+            "id": f"row-{index}",
+            "runway_plate_history": {"35R": list(runway_points)},
+        }
+        for index in range(SCAN_PAYLOAD_FULL_RUNWAY_HISTORY_ROWS + 2)
+    ]
+
+    compacted = compact_ranked_scan_rows_for_payload(rows)
+
+    assert len(compacted[0]["runway_plate_history"]["35R"]) == len(runway_points)
+    assert (
+        len(
+            compacted[SCAN_PAYLOAD_FULL_RUNWAY_HISTORY_ROWS - 1][
+                "runway_plate_history"
+            ]["35R"]
+        )
+        == len(runway_points)
+    )
+    assert (
+        len(
+            compacted[SCAN_PAYLOAD_FULL_RUNWAY_HISTORY_ROWS][
+                "runway_plate_history"
+            ]["35R"]
+        )
+        == SCAN_PAYLOAD_DEFERRED_RUNWAY_POINTS
+    )
+    assert len(rows[SCAN_PAYLOAD_FULL_RUNWAY_HISTORY_ROWS]["runway_plate_history"]["35R"]) == len(
+        runway_points
+    )
+
+
+def test_scan_terminal_quick_row_compacts_runway_history_for_list_payload():
+    raw_history = {
+        "35R": [
+            {"time": "2026-05-31T00:00:00+00:00", "temp": 22.11},
+            {"time": "2026-05-31T00:01:00+00:00", "temp": 22.22},
+            {"time": "2026-05-31T00:02:00+00:00", "temp": 22.33},
+            {"time": "2026-05-31T00:10:00+00:00", "temp": 23.44},
+            {"time": "2026-05-31T00:11:00+00:00", "temp": 23.55},
+        ]
+    }
+
+    row = _build_quick_row(
+        city="shanghai",
+        data={
+            "display_name": "Shanghai",
+            "local_date": "2026-05-31",
+            "local_time": "2026-05-31T08:11:00+08:00",
+            "temp_symbol": "°C",
+            "current": {"temp": 22.3, "max_so_far": 23.0},
+            "risk": {"airport": "Shanghai Pudong", "level": "medium"},
+            "deb": {"prediction": 24.0},
+            "probabilities": {"distribution": []},
+            "multi_model": {},
+            "runway_plate_history": raw_history,
+        },
+    )
+
+    compact_history = row["runway_plate_history"]["35R"]
+
+    assert len(compact_history) == 2
+    assert compact_history[0]["temp"] == 22.3
+    assert compact_history[1]["temp"] == 23.6
+    assert len(str(row["runway_plate_history"])) < len(str(raw_history))
+
+
 def test_metar_gate_vetoes_yes_when_observed_breaks_above_bucket():
    row = {
        "id": "yes-row",
@@ -158,4 +302,3 @@ def test_metar_gate_vetoes_yes_when_observed_breaks_above_bucket():
    assert row["v4_metar_decision"] == "veto"
    assert row["ai_decision"] == "veto"
    assert "越过目标桶上沿" in row["ai_reason_zh"]
-
@@ -129,8 +129,125 @@ def test_events_endpoint_emits_resync_when_replay_is_incomplete(monkeypatch):

 def test_replay_limit_is_bounded():
    assert sse_router._bounded_replay_limit(0) == 1
-    assert sse_router._bounded_replay_limit(500) == 500
-    assert sse_router._bounded_replay_limit(5000) == 2000
+    assert sse_router._bounded_replay_limit(500) == 60
+    assert sse_router._bounded_replay_limit(5000) == 60
+    assert sse_router._bounded_replay_limit(500, city_count=5) == 120
+    assert sse_router._bounded_replay_limit(500, city_count=20) == 240
+    assert sse_router._bounded_replay_limit(25, city_count=5) == 25
+
+
+def test_replay_gap_direct_resync_policy():
+    assert (
+        sse_router._should_direct_resync(
+            since_revision=1000,
+            latest_revision=1200,
+            limit=60,
+        )
+        is False
+    )
+    assert (
+        sse_router._should_direct_resync(
+            since_revision=1000,
+            latest_revision=1300,
+            limit=60,
+        )
+        is True
+    )
+    assert (
+        sse_router._should_direct_resync(
+            since_revision=0,
+            latest_revision=1300,
+            limit=60,
+        )
+        is False
+    )
+
+
+def test_legacy_high_replay_limit_is_clamped_by_city_count(monkeypatch):
+    captured = {}
+
+    class FakeStore:
+        def latest_revision(self):
+            return 44
+
+        def replay_events(self, *, cities, since_revision, limit):
+            captured["cities"] = cities
+            captured["limit"] = limit
+            return []
+
+        def replay_requires_resync(self, *, cities, since_revision, replay_count, limit):
+            captured["resync_limit"] = limit
+            return False
+
+    async def finite_stream(
+        user_id,
+        *,
+        cities=None,
+        replay_events=None,
+        connected_revision=0,
+        resync_event=None,
+    ):
+        yield sse_router.sse_manager._format_event(
+            {"type": "connected", "revision": connected_revision}
+        )
+
+    monkeypatch.setattr(sse_router, "event_store", FakeStore())
+    monkeypatch.setattr(sse_router.sse_manager, "event_stream", finite_stream)
+
+    response = TestClient(app).get(
+        "/api/events?cities=ankara,buenos%20aires,istanbul,jeddah,seoul"
+        "&since_revision=42&replay_limit=500"
+    )
+
+    assert response.status_code == 200
+    assert captured["cities"] == {"ankara", "buenos aires", "istanbul", "jeddah", "seoul"}
+    assert captured["limit"] == 120
+    assert captured["resync_limit"] == 120
+
+
+def test_stale_client_gets_direct_resync_without_replay_scan(monkeypatch):
+    calls = {"replay": 0, "requires_resync": 0}
+
+    class FakeStore:
+        def latest_revision(self):
+            return 2000
+
+        def replay_events(self, *, cities, since_revision, limit):
+            calls["replay"] += 1
+            return []
+
+        def replay_requires_resync(self, *, cities, since_revision, replay_count, limit):
+            calls["requires_resync"] += 1
+            return False
+
+    async def finite_stream(
+        user_id,
+        *,
+        cities=None,
+        replay_events=None,
+        connected_revision=0,
+        resync_event=None,
+    ):
+        yield sse_router.sse_manager._format_event(
+            {"type": "connected", "revision": connected_revision}
+        )
+        if resync_event:
+            yield sse_router.sse_manager._format_event(resync_event)
+
+    monkeypatch.setattr(sse_router, "event_store", FakeStore())
+    monkeypatch.setattr(sse_router.sse_manager, "event_stream", finite_stream)
+
+    response = TestClient(app).get(
+        "/api/events?cities=ankara,buenos%20aires,istanbul,jeddah,seoul"
+        "&since_revision=100&replay_limit=500"
+    )
+
+    assert response.status_code == 200
+    assert calls == {"replay": 0, "requires_resync": 0}
+    events = _decode_sse_events(response.text)
+    assert events[-1]["type"] == "resync_required"
+    assert events[-1]["reason"] == "replay_gap_too_large"
+    assert events[-1]["latest_revision"] == 2000


 def test_ingest_patch_uses_external_fanout_without_direct_broadcast(monkeypatch):
@@ -31,6 +31,27 @@ def test_healthz_returns_ok_shape():
    assert 'cities_count' in payload


+def test_healthz_keeps_liveness_200_when_db_health_is_degraded(monkeypatch):
+    from web.services import system_api
+
+    monkeypatch.setattr(
+        system_api,
+        "build_health_payload",
+        lambda: {
+            "status": "degraded",
+            "time_utc": "2026-05-30T00:00:00+00:00",
+            "db": {"ok": False, "error": "database is locked"},
+            "state_storage_mode": "sqlite",
+            "cities_count": 50,
+        },
+    )
+
+    response = client.get("/healthz")
+
+    assert response.status_code == 200
+    assert response.json()["status"] == "degraded"
+
+
 def test_system_status_returns_summary_shape():
    response = client.get('/api/system/status')
    assert response.status_code == 200
@@ -315,6 +336,15 @@ def test_ops_billing_risk_surfaces_trial_payment_referral_and_points(monkeypatch
        DBManager,
        "list_app_analytics_events",
        lambda self, limit=20000, since_iso=None: [
+            {
+                "id": 10,
+                "event_type": "login_start",
+                "user_id": None,
+                "client_id": "c1",
+                "session_id": "session-gap",
+                "created_at": recent,
+                "payload": {"mode": "signup"},
+            },
            {
                "id": 11,
                "event_type": "signup_success",
@@ -419,6 +449,108 @@ def test_ops_billing_risk_does_not_flag_signup_when_backend_trial_exists(monkeyp
    assert not any(issue["category"] == "signup_trial" for issue in payload["issues"])


+def test_ops_billing_risk_ignores_account_visit_without_signup_intent(monkeypatch):
+    from src.database.db_manager import DBManager
+
+    recent = datetime.now(timezone.utc).isoformat()
+
+    monkeypatch.setattr(ops_api.legacy_routes, "_require_ops_admin", lambda request: {"email": "ops@example.com"})
+    monkeypatch.setattr(ops_api, "_supabase_rest_rows", lambda table, params, *, timeout=10: [])
+    monkeypatch.setattr(
+        DBManager,
+        "list_app_analytics_events",
+        lambda self, limit=20000, since_iso=None: [
+            {
+                "id": 61,
+                "event_type": "signup_success",
+                "user_id": "returning-no-trial-user",
+                "client_id": "client-return",
+                "session_id": "session-return",
+                "created_at": recent,
+                "payload": {
+                    "entry": "account_center",
+                    "user_id": "returning-no-trial-user",
+                },
+            }
+        ],
+    )
+    monkeypatch.setattr(
+        DBManager,
+        "list_payment_audit_events",
+        lambda self, limit=50, event_type=None: [],
+    )
+
+    payload = ops_api.get_ops_billing_risk(None, days=30, limit=20)
+
+    assert payload["summary"]["trial_gaps"] == 0
+    assert not any(issue["category"] == "signup_trial" for issue in payload["issues"])
+
+
+def test_ops_billing_risk_treats_expired_signup_trial_subscription_as_backend_evidence(monkeypatch):
+    from src.database.db_manager import DBManager
+
+    now = datetime.now(timezone.utc)
+    recent = now.isoformat()
+    expired = (now - timedelta(days=2)).isoformat()
+
+    def fake_supabase_rows(table, params, *, timeout=10):
+        if table == "subscriptions" and params.get("or") == "(source.eq.signup_trial,plan_code.eq.signup_trial_3d)":
+            return [
+                {
+                    "id": 81,
+                    "user_id": "expired-trial-user",
+                    "plan_code": "signup_trial_3d",
+                    "source": "signup_trial",
+                    "status": "expired",
+                    "starts_at": (now - timedelta(days=5)).isoformat(),
+                    "expires_at": expired,
+                    "created_at": (now - timedelta(days=5)).isoformat(),
+                    "updated_at": expired,
+                }
+            ]
+        return []
+
+    monkeypatch.setattr(ops_api.legacy_routes, "_require_ops_admin", lambda request: {"email": "ops@example.com"})
+    monkeypatch.setattr(ops_api, "_supabase_rest_rows", fake_supabase_rows)
+    monkeypatch.setattr(
+        DBManager,
+        "list_app_analytics_events",
+        lambda self, limit=20000, since_iso=None: [
+            {
+                "id": 80,
+                "event_type": "login_start",
+                "user_id": None,
+                "client_id": "client-expired",
+                "session_id": "session-expired",
+                "created_at": recent,
+                "payload": {"mode": "signup"},
+            },
+            {
+                "id": 82,
+                "event_type": "signup_success",
+                "user_id": "expired-trial-user",
+                "client_id": "client-expired",
+                "session_id": "session-expired",
+                "created_at": recent,
+                "payload": {
+                    "entry": "account_center",
+                    "user_id": "expired-trial-user",
+                },
+            },
+        ],
+    )
+    monkeypatch.setattr(
+        DBManager,
+        "list_payment_audit_events",
+        lambda self, limit=50, event_type=None: [],
+    )
+
+    payload = ops_api.get_ops_billing_risk(None, days=30, limit=20)
+
+    assert payload["summary"]["trial_gaps"] == 0
+    assert not any(issue["category"] == "signup_trial" for issue in payload["issues"])
+
+
 def test_ops_payment_incidents_expose_top_level_reason_and_filters_resolved(monkeypatch):
    from src.database.db_manager import DBManager

@@ -567,6 +699,119 @@ def test_city_detail_batch_endpoint_builds_multiple_cached_details(monkeypatch):
    assert sorted(calls) == [("paris", "10m"), ("shanghai", "10m")]


+def test_city_detail_batch_chart_scope_returns_only_chart_fields(monkeypatch):
+    monkeypatch.setattr(city_api.legacy_routes, "_assert_entitlement", lambda request: None)
+    monkeypatch.setattr(city_api.legacy_routes, "_normalize_city_or_404", lambda name: name.strip().lower())
+    monkeypatch.setattr(
+        city_api.legacy_routes,
+        "_city_cache_is_fresh",
+        lambda entry, ttl: True,
+    )
+    monkeypatch.setattr(
+        city_api.legacy_routes,
+        "_overlay_latest_wunderground_current",
+        lambda city, payload: payload,
+    )
+
+    class FakeCache:
+        def get_city_cache(self, kind, city):
+            assert kind == "full"
+            return {
+                "payload": {
+                    "name": city,
+                    "display_name": city.title(),
+                    "local_date": "2026-05-30",
+                    "local_time": "15:20",
+                    "temp_symbol": "°C",
+                    "current": {
+                        "temp": 20.0,
+                        "settlement_source": "metar",
+                        "settlement_source_label": "METAR",
+                    },
+                    "hourly": {"times": ["2026-05-30T00:00:00Z"], "temps": [20.0]},
+                    "forecast": {
+                        "today_high": 22.0,
+                        "daily": [{"date": "2026-05-30", "max_temp": 22.0}],
+                    },
+                    "multi_model": {
+                        "hourly_times": ["15:00"],
+                        "hourly_forecasts": {"ECMWF": [21.0]},
+                    },
+                    "deb": {"prediction": 21.5, "hourly_path": {"times": ["15:00"], "temps": [21.5]}},
+                    "probabilities": {"mu": 21.4, "distribution": [{"value": 21, "probability": 0.4}]},
+                    "runway_plate_history": {"01/19": [{"time": "2026-05-30T15:20:00Z", "temp": 20.1}]},
+                    "airport_current": {"temp": 20.0},
+                    "airport_primary": {"temp": 20.0},
+                    "airport_primary_today_obs": [["15:20", 20.0]],
+                    "wunderground_current": {"max_so_far": 20.5},
+                    "settlement_station": {"settlement_station_label": "Station"},
+                    "amos": {"runway_obs": {"point_temperatures": []}},
+                    "metar_today_obs": [{"time": "15:20", "temp": 20.0}],
+                    "settlement_today_obs": [],
+                    "dynamic_commentary": {"summary": "large text"},
+                    "official_nearby": [{"name": "unused"}],
+                    "taf": {"raw": "unused"},
+                    "ai_analysis": "unused",
+                }
+            }
+
+    def build_detail(_data, _market_slug, _target_date, _resolution):
+        raise AssertionError("chart scope must not build the full city detail payload")
+
+    monkeypatch.setattr(city_api.legacy_routes, "_CACHE_DB", FakeCache())
+    monkeypatch.setattr(city_api.legacy_routes, "_build_city_detail_payload", build_detail)
+
+    response = client.get("/api/cities/detail-batch?cities=Paris&resolution=10m&scope=chart")
+
+    assert response.status_code == 200
+    detail = response.json()["details"]["paris"]
+    assert detail["timeseries"]["hourly"]["temps"] == [20.0]
+    assert detail["models_hourly"]["curves"]["ECMWF"] == [21.0]
+    assert detail["deb"]["hourly_path"]["temps"] == [21.5]
+    assert detail["airport_primary_today_obs"] == [["15:20", 20.0]]
+    assert "dynamic_commentary" not in detail
+    assert "official_nearby" not in detail
+    assert "taf" not in detail
+    assert "ai_analysis" not in detail
+
+
+def test_chart_detail_payload_avoids_threadpool_queue_and_reuses_short_cache(monkeypatch):
+    import asyncio
+
+    build_calls = 0
+
+    async def fail_threadpool(*_args, **_kwargs):
+        raise AssertionError("chart payload should not wait behind the shared threadpool")
+
+    def build_chart_detail(data, resolution):
+        nonlocal build_calls
+        build_calls += 1
+        return {
+            "city": data["city"],
+            "resolution": resolution,
+            "hourly": data["hourly"],
+        }
+
+    city_api._CITY_CHART_DETAIL_PAYLOAD_CACHE.clear()
+    city_api._CITY_CHART_DETAIL_PAYLOAD_CACHE_TS.clear()
+    monkeypatch.setenv("POLYWEATHER_CITY_DETAIL_PAYLOAD_CACHE_TTL_SEC", "20")
+    monkeypatch.setattr(city_api, "run_in_threadpool", fail_threadpool)
+    monkeypatch.setattr(city_api.legacy_routes, "_build_city_chart_detail_payload", build_chart_detail)
+
+    data = {
+        "city": "paris",
+        "updated_at": "2026-05-30T15:00:00Z",
+        "hourly": {"times": ["2026-05-30T15:00:00Z"], "temps": [20.0]},
+    }
+
+    first = asyncio.run(city_api._build_city_chart_detail_payload(data, "10m"))
+    second = asyncio.run(city_api._build_city_chart_detail_payload(data, "10m"))
+
+    assert first == second
+    assert first["resolution"] == "10m"
+    assert build_calls == 1
+
+
 def test_city_detail_batch_endpoint_limits_backend_concurrency(monkeypatch):
    import asyncio

@@ -656,6 +901,109 @@ def test_city_detail_batch_returns_completed_details_when_one_city_is_slow(monke
    assert "slow" not in completed


+def test_city_detail_batch_response_cache_keeps_entitlement_check(monkeypatch):
+    import asyncio
+
+    entitlement_calls = 0
+    build_calls = 0
+
+    async def build_batch_item(city, **kwargs):
+        nonlocal build_calls
+        build_calls += 1
+        return city, {
+            "city": city,
+            "hourly": {"times": ["2026-05-30T00:00:00Z"], "temps": [20.0]},
+            "resolution": kwargs.get("resolution"),
+        }
+
+    def assert_entitlement(request):
+        nonlocal entitlement_calls
+        entitlement_calls += 1
+
+    city_api._CITY_DETAIL_BATCH_RESPONSE_CACHE.clear()
+    city_api._CITY_DETAIL_BATCH_RESPONSE_CACHE_TS.clear()
+    city_api._CITY_DETAIL_BATCH_RESPONSE_INFLIGHT.clear()
+
+    monkeypatch.setenv("POLYWEATHER_CITY_DETAIL_BATCH_RESPONSE_CACHE_TTL_SEC", "20")
+    monkeypatch.setattr(city_api.legacy_routes, "_assert_entitlement", assert_entitlement)
+    monkeypatch.setattr(city_api.legacy_routes, "_normalize_city_or_404", lambda name: name.strip().lower())
+    monkeypatch.setattr(city_api, "_build_city_detail_batch_item_async", build_batch_item)
+
+    first = asyncio.run(
+        city_api.get_city_detail_batch_payload(
+            object(),
+            cities="Paris",
+            resolution="10m",
+            limit=12,
+        )
+    )
+    second = asyncio.run(
+        city_api.get_city_detail_batch_payload(
+            object(),
+            cities="Paris",
+            resolution="10m",
+            limit=12,
+        )
+    )
+
+    assert first == second
+    assert first["details"]["paris"]["resolution"] == "10m"
+    assert entitlement_calls == 2
+    assert build_calls == 1
+
+
+def test_concurrent_city_detail_batch_requests_share_inflight_response(monkeypatch):
+    import asyncio
+
+    entitlement_calls = 0
+    build_calls = 0
+
+    async def build_batch_item(city, **kwargs):
+        nonlocal build_calls
+        build_calls += 1
+        await asyncio.sleep(0.02)
+        return city, {
+            "city": city,
+            "hourly": {"times": ["2026-05-30T00:00:00Z"], "temps": [20.0]},
+            "resolution": kwargs.get("resolution"),
+        }
+
+    def assert_entitlement(request):
+        nonlocal entitlement_calls
+        entitlement_calls += 1
+
+    city_api._CITY_DETAIL_BATCH_RESPONSE_CACHE.clear()
+    city_api._CITY_DETAIL_BATCH_RESPONSE_CACHE_TS.clear()
+    city_api._CITY_DETAIL_BATCH_RESPONSE_INFLIGHT.clear()
+
+    monkeypatch.setenv("POLYWEATHER_CITY_DETAIL_BATCH_RESPONSE_CACHE_TTL_SEC", "20")
+    monkeypatch.setattr(city_api.legacy_routes, "_assert_entitlement", assert_entitlement)
+    monkeypatch.setattr(city_api.legacy_routes, "_normalize_city_or_404", lambda name: name.strip().lower())
+    monkeypatch.setattr(city_api, "_build_city_detail_batch_item_async", build_batch_item)
+
+    async def run_requests():
+        return await asyncio.gather(
+            city_api.get_city_detail_batch_payload(
+                object(),
+                cities="Paris",
+                resolution="10m",
+                limit=12,
+            ),
+            city_api.get_city_detail_batch_payload(
+                object(),
+                cities="Paris",
+                resolution="10m",
+                limit=12,
+            ),
+        )
+
+    first, second = asyncio.run(run_requests())
+
+    assert first == second
+    assert entitlement_calls == 2
+    assert build_calls == 1
+
+
 def test_concurrent_city_detail_requests_share_same_full_cache_refresh(monkeypatch):
    import asyncio

@@ -2019,6 +2367,102 @@ def test_scan_terminal_service_returns_stale_payload_after_failed_refresh(monkey
    assert stale["stale_reason"] == "upstream 504"


+def test_scan_terminal_timeout_does_not_replace_better_cached_snapshot(monkeypatch):
+    import time
+
+    filters = {"scan_mode": "tradable", "limit": 5}
+    normalized_filters = scan_terminal_service._normalize_scan_terminal_filters(filters)
+    scan_terminal_cache._SCAN_TERMINAL_CACHE.clear()
+    previous_payload = {
+        "generated_at": "2026-05-31T00:00:00Z",
+        "snapshot_id": "scan-existing",
+        "filters": normalized_filters,
+        "summary": {"candidate_total": 2, "visible_count": 2},
+        "top_signal": {"id": "old-1"},
+        "rows": [{"id": "old-1"}, {"id": "old-2"}],
+        "status": "ready",
+        "stale": False,
+        "stale_reason": None,
+        "last_success_at": None,
+        "last_failed_at": None,
+    }
+    scan_terminal_cache.set_cached_scan_terminal_payload(
+        normalized_filters,
+        previous_payload,
+    )
+
+    monkeypatch.setattr(
+        scan_terminal_service,
+        "CITIES",
+        {"fast": {"tz": 0}, "slow": {"tz": 0}},
+    )
+    monkeypatch.setattr(scan_terminal_service, "SCAN_TERMINAL_BUILD_TIMEOUT_SEC", 0.01)
+    monkeypatch.setattr(scan_terminal_service, "SCAN_TERMINAL_MAX_WORKERS", 2)
+
+    def _scan_city(city_name, *_args, **_kwargs):
+        if city_name == "slow":
+            time.sleep(0.05)
+        return {
+            "city": city_name,
+            "candidate_total": 1,
+            "primary_scores": [80.0],
+            "rows": [
+                {
+                    "id": f"{city_name}-row",
+                    "market_key": f"{city_name}-market",
+                    "edge_percent": 4.0,
+                    "final_score": 80.0,
+                    "volume": 1000,
+                }
+            ],
+        }
+
+    monkeypatch.setattr(scan_terminal_service, "_scan_city_terminal_rows", _scan_city)
+
+    stale = scan_terminal_service.build_scan_terminal_payload(filters, force_refresh=True)
+
+    assert stale["status"] == "stale"
+    assert stale["stale"] is True
+    assert [row["id"] for row in stale["rows"]] == ["old-1", "old-2"]
+    assert stale["stale_reason"].startswith("scan terminal build timed out")
+    cached = scan_terminal_cache.get_cached_scan_terminal_payload(
+        normalized_filters,
+        ttl_sec=3600,
+    )
+    assert [row["id"] for row in cached["rows"]] == ["old-1", "old-2"]
+
+
+def test_scan_terminal_prewarm_builds_default_terminal_payload(monkeypatch):
+    calls = []
+
+    def _fake_build(filters, *, force_refresh=False, timeout_sec=None):
+        calls.append((dict(filters), force_refresh, timeout_sec))
+        return {"rows": []}
+
+    monkeypatch.setattr(
+        scan_terminal_service,
+        "_build_scan_terminal_payload_uncached",
+        _fake_build,
+    )
+
+    assert scan_terminal_service._warm_scan_terminal_payloads() == 2
+    assert {filters["limit"] for filters, _, _ in calls} == {25, 180}
+    filters, force_refresh, timeout_sec = calls[0]
+    assert all(force_refresh is False for _, force_refresh, _ in calls)
+    assert all(
+        timeout_sec == scan_terminal_service.SCAN_TERMINAL_PREWARM_PAYLOAD_TIMEOUT_SEC
+        for _, _, timeout_sec in calls
+    )
+    assert filters["scan_mode"] == "tradable"
+    assert filters["min_price"] == 0.05
+    assert filters["max_price"] == 0.95
+    assert filters["min_edge_pct"] == 2.0
+    assert filters["min_liquidity"] == 500.0
+    assert filters["market_type"] == "maxtemp"
+    assert filters["time_range"] == "today"
+    assert filters["limit"] == 25
+
+
 def test_scan_terminal_service_returns_failed_without_success_snapshot(monkeypatch):
    filters = {"scan_mode": "tradable", "limit": 5}
    scan_terminal_cache._SCAN_TERMINAL_CACHE.clear()
@@ -37,6 +37,7 @@ from src.data_collection.city_registry import ALIASES, CITY_REGISTRY
 from src.data_collection.city_time import get_city_utc_offset_seconds
 from src.database.runtime_state import IntradayPathSnapshotRepository
 from web.services.city_payloads import (
+    build_city_chart_detail_payload as _city_chart_payload_detail,
    build_city_detail_payload as _city_payload_detail,
    build_city_summary_payload as _city_payload_summary
 )
@@ -2312,6 +2313,13 @@ def _build_city_detail_payload(
    )


+def _build_city_chart_detail_payload(
+    data: Dict[str, Any],
+    resolution: Optional[str] = "10m",
+) -> Dict[str, Any]:
+    return _city_chart_payload_detail(data, resolution=resolution)
+
+

 # ──────────────────────────────────────────────────────────
 #  Routes
@@ -24,10 +24,15 @@ from web.scan_terminal_service import start_scan_terminal_prewarm
 _ROUTES_REGISTERED_FLAG = "_polyweather_routes_registered"


+def _service_role() -> str:
+    return str(os.getenv("POLYWEATHER_SERVICE_ROLE") or "").strip().lower()
+
+
 def _scan_terminal_prewarm_enabled() -> bool:
-    return str(
+    enabled = str(
        os.getenv("POLYWEATHER_SCAN_TERMINAL_PREWARM_ENABLED") or "false"
    ).strip().lower() in {"1", "true", "yes", "on"}
+    return enabled and _service_role() in {"web", "api", "backend"}


 def create_app() -> FastAPI:
@@ -511,7 +511,7 @@ def _is_excluded_model_name(model_name: str) -> bool:

 def _sqlite_health() -> Dict[str, Any]:
    try:
-        with sqlite3.connect(_account_db.db_path) as conn:
+        with sqlite3.connect(_account_db.db_path, timeout=0.05) as conn:
            conn.execute("SELECT 1").fetchone()
        return {"ok": True, "db_path": _account_db.db_path}
    except Exception as exc:
@@ -115,6 +115,7 @@ async def city_detail_batch(
    market_slug: Optional[str] = None,
    target_date: Optional[str] = None,
    resolution: Optional[str] = "10m",
+    scope: Optional[str] = "full",
    limit: int = 12,
 ):
    payload = await get_city_detail_batch_payload(
@@ -124,6 +125,7 @@ async def city_detail_batch(
        market_slug=market_slug,
        target_date=target_date,
        resolution=resolution,
+        scope=scope,
        limit=limit,
    )
    attach_server_timing_header(response, request, "city_detail_batch_server_timing")
@@ -19,6 +19,10 @@ router = APIRouter(tags=["events"])
 event_store = create_realtime_event_store()
 _live_subscription_lock = threading.Lock()
 _live_subscription_started = False
+SSE_REPLAY_BASE_LIMIT = 60
+SSE_REPLAY_EVENTS_PER_CITY = 24
+SSE_REPLAY_MAX_LIMIT = 240
+SSE_REPLAY_DIRECT_RESYNC_FACTOR = 3


 def _parse_cities_param(cities: str) -> Set[str]:
@@ -29,12 +33,33 @@ def _parse_cities_param(cities: str) -> Set[str]:
    }


-def _bounded_replay_limit(value: int) -> int:
+def _recommended_replay_limit(city_count: int) -> int:
+    requested = max(1, int(city_count or 0)) * SSE_REPLAY_EVENTS_PER_CITY
+    return max(SSE_REPLAY_BASE_LIMIT, min(SSE_REPLAY_MAX_LIMIT, requested))
+
+
+def _bounded_replay_limit(value: int, *, city_count: int = 0) -> int:
    try:
        limit = int(value)
    except (TypeError, ValueError):
-        limit = 500
-    return max(1, min(MAX_REPLAY_LIMIT, limit))
+        limit = _recommended_replay_limit(city_count)
+    route_limit = _recommended_replay_limit(city_count)
+    return max(1, min(MAX_REPLAY_LIMIT, route_limit, limit))
+
+
+def _should_direct_resync(
+    *,
+    since_revision: int,
+    latest_revision: int,
+    limit: int,
+) -> bool:
+    since = max(0, int(since_revision or 0))
+    latest = max(0, int(latest_revision or 0))
+    if since <= 0 or latest <= since:
+        return False
+    gap = latest - since
+    threshold = max(SSE_REPLAY_MAX_LIMIT, max(1, int(limit or 1)) * SSE_REPLAY_DIRECT_RESYNC_FACTOR)
+    return gap > threshold


 def _ensure_live_subscription() -> None:
@@ -65,7 +90,7 @@ async def sse_events(
    origin = request.headers.get("origin", "")
    allowed = origin in {"https://polyweather.top", "https://www.polyweather.top", "http://localhost:3000"}
    city_set = _parse_cities_param(cities)
-    limit = _bounded_replay_limit(replay_limit)
+    limit = _bounded_replay_limit(replay_limit, city_count=len(city_set))
    _ensure_live_subscription()
    latest_revision = event_store.latest_revision()
    replay_events = []
@@ -73,23 +98,36 @@ async def sse_events(

    if since_revision is not None:
        try:
-            replay_events = event_store.replay_events(
-                cities=city_set,
-                since_revision=max(0, int(since_revision)),
-                limit=limit,
-            )
-            if event_store.replay_requires_resync(
-                cities=city_set,
-                since_revision=max(0, int(since_revision)),
-                replay_count=len(replay_events),
+            since = max(0, int(since_revision))
+            if _should_direct_resync(
+                since_revision=since,
+                latest_revision=latest_revision,
                limit=limit,
            ):
                resync_event = {
                    "type": "resync_required",
-                    "reason": "replay_window_exceeded",
+                    "reason": "replay_gap_too_large",
                    "latest_revision": latest_revision,
                    "ts": int(time.time() * 1000),
                }
+            else:
+                replay_events = event_store.replay_events(
+                    cities=city_set,
+                    since_revision=since,
+                    limit=limit,
+                )
+                if event_store.replay_requires_resync(
+                    cities=city_set,
+                    since_revision=since,
+                    replay_count=len(replay_events),
+                    limit=limit,
+                ):
+                    resync_event = {
+                        "type": "resync_required",
+                        "reason": "replay_window_exceeded",
+                        "latest_revision": latest_revision,
+                        "ts": int(time.time() * 1000),
+                    }
        except Exception:
            resync_event = {
                "type": "resync_required",
@@ -1,6 +1,8 @@
 from __future__ import annotations

 import json
+import hashlib
+import os
 import threading
 import time
 from datetime import datetime
@@ -9,39 +11,140 @@ from typing import Any, Dict, Optional
 _SCAN_TERMINAL_CACHE_LOCK = threading.Lock()
 _SCAN_TERMINAL_CACHE: Dict[str, Dict[str, Any]] = {}
 _SCAN_TERMINAL_REFRESHING: set[str] = set()
+_SCAN_TERMINAL_REDIS_CLIENT_LOCK = threading.Lock()
+_SCAN_TERMINAL_REDIS_CLIENT: Any = None
+_SCAN_TERMINAL_REDIS_UNAVAILABLE = False


 def scan_terminal_cache_key(filters: Dict[str, Any]) -> str:
    return json.dumps(filters, ensure_ascii=True, sort_keys=True)


+def _truthy_env(name: str, *, default: bool = False) -> bool:
+    value = os.getenv(name)
+    if value is None:
+        return default
+    return str(value).strip().lower() not in ("", "0", "false", "no", "off")
+
+
+def _redis_cache_enabled() -> bool:
+    return _truthy_env(
+        "POLYWEATHER_SCAN_TERMINAL_REDIS_CACHE_ENABLED",
+        default=bool(os.getenv("POLYWEATHER_REDIS_URL")),
+    )
+
+
+def _redis_cache_ttl_sec() -> int:
+    try:
+        value = int(os.getenv("POLYWEATHER_SCAN_TERMINAL_REDIS_CACHE_TTL_SEC", "21600"))
+    except Exception:
+        value = 21600
+    return max(600, min(value, 86400))
+
+
+def _redis_cache_prefix() -> str:
+    return os.getenv(
+        "POLYWEATHER_SCAN_TERMINAL_REDIS_CACHE_PREFIX",
+        "polyweather:scan_terminal:v1:",
+    )
+
+
+def _redis_entry_key(cache_key: str) -> str:
+    digest = hashlib.sha256(cache_key.encode("utf-8")).hexdigest()
+    return f"{_redis_cache_prefix()}{digest}"
+
+
+def _get_redis_client() -> Any:
+    global _SCAN_TERMINAL_REDIS_CLIENT, _SCAN_TERMINAL_REDIS_UNAVAILABLE
+
+    if not _redis_cache_enabled() or _SCAN_TERMINAL_REDIS_UNAVAILABLE:
+        return None
+
+    with _SCAN_TERMINAL_REDIS_CLIENT_LOCK:
+        if _SCAN_TERMINAL_REDIS_CLIENT is not None:
+            return _SCAN_TERMINAL_REDIS_CLIENT
+        try:
+            import redis  # type: ignore
+
+            url = os.getenv("POLYWEATHER_REDIS_URL") or "redis://127.0.0.1:6379/0"
+            client = redis.Redis.from_url(
+                url,
+                socket_timeout=float(os.getenv("POLYWEATHER_REDIS_SOCKET_TIMEOUT_SECONDS", "2")),
+                socket_connect_timeout=float(
+                    os.getenv("POLYWEATHER_REDIS_SOCKET_CONNECT_TIMEOUT_SECONDS", "1")
+                ),
+                health_check_interval=30,
+            )
+            client.ping()
+            _SCAN_TERMINAL_REDIS_CLIENT = client
+            return client
+        except Exception:
+            _SCAN_TERMINAL_REDIS_UNAVAILABLE = True
+            return None
+
+
+def _read_redis_cache_entry(cache_key: str) -> Optional[Dict[str, Any]]:
+    client = _get_redis_client()
+    if client is None:
+        return None
+    try:
+        raw = client.get(_redis_entry_key(cache_key))
+        if not raw:
+            return None
+        if isinstance(raw, bytes):
+            raw = raw.decode("utf-8")
+        entry = json.loads(str(raw))
+        return dict(entry) if isinstance(entry, dict) else None
+    except Exception:
+        return None
+
+
+def _write_redis_cache_entry(cache_key: str, entry: Dict[str, Any]) -> None:
+    client = _get_redis_client()
+    if client is None:
+        return
+    try:
+        client.setex(
+            _redis_entry_key(cache_key),
+            _redis_cache_ttl_sec(),
+            json.dumps(entry, ensure_ascii=False, separators=(",", ":")),
+        )
+    except Exception:
+        return
+
+
 def get_cached_scan_terminal_payload(
    filters: Dict[str, Any],
    *,
    ttl_sec: int,
 ) -> Optional[Dict[str, Any]]:
-    cache_key = scan_terminal_cache_key(filters)
    now = time.time()
-    with _SCAN_TERMINAL_CACHE_LOCK:
-        cached = _SCAN_TERMINAL_CACHE.get(cache_key)
-        if not cached:
-            return None
-        cached_at = float(cached.get("t") or 0.0)
-        if now - cached_at >= float(ttl_sec):
-            return None
-        payload = cached.get("payload")
-        if not isinstance(payload, dict):
-            return None
-        return dict(payload)
+    cached = get_scan_terminal_cache_entry(filters)
+    if not cached:
+        return None
+    cached_at = float(cached.get("t") or 0.0)
+    if now - cached_at >= float(ttl_sec):
+        return None
+    payload = cached.get("payload")
+    if not isinstance(payload, dict):
+        return None
+    return dict(payload)


 def get_scan_terminal_cache_entry(filters: Dict[str, Any]) -> Optional[Dict[str, Any]]:
    cache_key = scan_terminal_cache_key(filters)
    with _SCAN_TERMINAL_CACHE_LOCK:
        cached = _SCAN_TERMINAL_CACHE.get(cache_key)
-        if not isinstance(cached, dict):
-            return None
-        return dict(cached)
+        if isinstance(cached, dict):
+            return dict(cached)
+
+    redis_entry = _read_redis_cache_entry(cache_key)
+    if not redis_entry:
+        return None
+
+    with _SCAN_TERMINAL_CACHE_LOCK:
+        _SCAN_TERMINAL_CACHE[cache_key] = dict(redis_entry)
+    return dict(redis_entry)


 def set_cached_scan_terminal_payload(
@@ -51,15 +154,17 @@ def set_cached_scan_terminal_payload(
    cache_key = scan_terminal_cache_key(filters)
    existing = get_scan_terminal_cache_entry(filters) or {}
    now = time.time()
+    entry = {
+        "t": now,
+        "payload": dict(payload),
+        "success_t": now,
+        "success_payload": dict(payload),
+        "last_error": existing.get("last_error"),
+        "last_failed_at": existing.get("last_failed_at"),
+    }
    with _SCAN_TERMINAL_CACHE_LOCK:
-        _SCAN_TERMINAL_CACHE[cache_key] = {
-            "t": now,
-            "payload": dict(payload),
-            "success_t": now,
-            "success_payload": dict(payload),
-            "last_error": existing.get("last_error"),
-            "last_failed_at": existing.get("last_failed_at"),
-        }
+        _SCAN_TERMINAL_CACHE[cache_key] = dict(entry)
+    _write_redis_cache_entry(cache_key, entry)


 def set_scan_terminal_failure_state(
@@ -68,11 +173,12 @@ def set_scan_terminal_failure_state(
    error_message: str,
 ) -> None:
    cache_key = scan_terminal_cache_key(filters)
+    existing = get_scan_terminal_cache_entry(filters) or {}
+    existing["last_error"] = error_message
+    existing["last_failed_at"] = datetime.utcnow().isoformat() + "Z"
    with _SCAN_TERMINAL_CACHE_LOCK:
-        existing = _SCAN_TERMINAL_CACHE.get(cache_key) or {}
-        existing["last_error"] = error_message
-        existing["last_failed_at"] = datetime.utcnow().isoformat() + "Z"
-        _SCAN_TERMINAL_CACHE[cache_key] = existing
+        _SCAN_TERMINAL_CACHE[cache_key] = dict(existing)
+    _write_redis_cache_entry(cache_key, existing)


 def mark_scan_terminal_refreshing(filters: Dict[str, Any]) -> bool:
@@ -11,6 +11,22 @@ from web.scan_terminal_filters import (
    market_region_from_tz_offset as _market_region_from_tz_offset,
    safe_int as _safe_int,
 )
+from web.services.city_payloads import aggregate_runway_history
+
+
+SCAN_ROW_RUNWAY_HISTORY_RESOLUTION = "10m"
+SCAN_ROW_MAX_RUNWAY_POINTS = 144
+
+
+def _compact_runway_plate_history_for_scan(raw_history: Any) -> Dict[str, List[Dict[str, Any]]]:
+    if not isinstance(raw_history, dict) or not raw_history:
+        return {}
+    compacted = aggregate_runway_history(raw_history, SCAN_ROW_RUNWAY_HISTORY_RESOLUTION)
+    return {
+        str(runway): points[-SCAN_ROW_MAX_RUNWAY_POINTS:]
+        for runway, points in compacted.items()
+        if isinstance(points, list) and points
+    }


 def _resolve_time_range_dates(data: Dict[str, Any], time_range: str) -> List[str]:
@@ -132,7 +148,9 @@ def _build_terminal_row(
        "amos": data.get("amos") or None,
        "top_buckets": scan.get("top_buckets") or [],
        "all_buckets": scan.get("all_buckets") or [],
-        "runway_plate_history": data.get("runway_plate_history") or {},
+        "runway_plate_history": _compact_runway_plate_history_for_scan(
+            data.get("runway_plate_history")
+        ),
    }


@@ -232,7 +250,9 @@ def _build_quick_row(
        "is_primary_signal": True,
        "accepting_orders": False,
        "row_id": row_id,
-        "runway_plate_history": data.get("runway_plate_history") or {},
+        "runway_plate_history": _compact_runway_plate_history_for_scan(
+            data.get("runway_plate_history")
+        ),
    }
    # Compute a simple edge: model top probability vs neutral
    best_model_prob = max(
@@ -5,6 +5,48 @@ import json
 from datetime import datetime
 from typing import Any, Dict, List, Optional

+SCAN_PAYLOAD_FULL_RUNWAY_HISTORY_ROWS = 9
+SCAN_PAYLOAD_DEFERRED_RUNWAY_POINTS = 12
+
+
+def _compact_runway_history_points(
+    history: Any,
+    *,
+    max_points: int,
+) -> Dict[str, List[Dict[str, Any]]]:
+    if not isinstance(history, dict) or max_points <= 0:
+        return {}
+    compacted: Dict[str, List[Dict[str, Any]]] = {}
+    for runway, points in history.items():
+        if not isinstance(points, list) or not points:
+            continue
+        compacted[str(runway)] = points[-max_points:]
+    return compacted
+
+
+def compact_ranked_scan_rows_for_payload(
+    rows: List[Dict[str, Any]],
+    *,
+    full_history_rows: int = SCAN_PAYLOAD_FULL_RUNWAY_HISTORY_ROWS,
+    deferred_runway_points: int = SCAN_PAYLOAD_DEFERRED_RUNWAY_POINTS,
+) -> List[Dict[str, Any]]:
+    compacted_rows: List[Dict[str, Any]] = []
+    for index, row in enumerate(rows):
+        if index < full_history_rows:
+            compacted_rows.append(row)
+            continue
+        history = row.get("runway_plate_history")
+        if not isinstance(history, dict) or not history:
+            compacted_rows.append(row)
+            continue
+        next_row = dict(row)
+        next_row["runway_plate_history"] = _compact_runway_history_points(
+            history,
+            max_points=deferred_runway_points,
+        )
+        compacted_rows.append(next_row)
+    return compacted_rows
+

 def build_scan_terminal_snapshot_id(
    filters: Dict[str, Any],
@@ -16,6 +16,7 @@ from web.services.scan_terminal_config import (
    SCAN_TERMINAL_BUILD_TIMEOUT_SEC,
    SCAN_TERMINAL_MAX_WORKERS,
    SCAN_TERMINAL_PAYLOAD_TTL_SEC,
+    SCAN_TERMINAL_PREWARM_PAYLOAD_TIMEOUT_SEC,
 )
 from src.data_collection.city_registry import ALIASES
 from web.scan_terminal_cache import (
@@ -34,6 +35,7 @@ from web.scan_terminal_payloads import (
    build_failed_scan_terminal_payload,
    build_scan_terminal_snapshot_id,
    build_stale_scan_terminal_payload,
+    compact_ranked_scan_rows_for_payload,
 )
 from web.scan_terminal_ranker import build_ranked_scan_terminal_result
 def _normalize_locale(value: Any) -> str:
@@ -47,6 +49,35 @@ def _normalize_city_key(value: Any) -> str:
    return ALIASES.get(text, text)


+def _rows_count(payload: Dict[str, Any]) -> int:
+    rows = payload.get("rows")
+    return len(rows) if isinstance(rows, list) else 0
+
+
+def _build_stale_payload_for_timeout_if_better_cached(
+    *,
+    filters: Dict[str, Any],
+    cached_entry: Dict[str, Any],
+    ranked_rows: List[Dict[str, Any]],
+    timeout_message: Optional[str],
+) -> Optional[Dict[str, Any]]:
+    success_payload = cached_entry.get("success_payload")
+    if not isinstance(success_payload, dict) or not success_payload.get("rows"):
+        return None
+    if _rows_count(success_payload) < len(ranked_rows):
+        return None
+
+    error_message = timeout_message or "市场扫描快照正在刷新中"
+    set_scan_terminal_failure_state(filters, error_message=error_message)
+    failed_entry = get_scan_terminal_cache_entry(filters) or cached_entry
+    return build_stale_scan_terminal_payload(
+        filters=filters,
+        success_payload=success_payload,
+        error_message=error_message,
+        failed_at=failed_entry.get("last_failed_at"),
+    )
+
+
 def _start_scan_terminal_background_refresh(filters: Dict[str, Any]) -> bool:
    if not mark_scan_terminal_refreshing(filters):
        return False
@@ -72,11 +103,17 @@ def _build_scan_terminal_payload_uncached(
    filters: Dict[str, Any],
    *,
    force_refresh: bool = False,
+    timeout_sec: Optional[float] = None,
 ) -> Dict[str, Any]:
    cached_entry = get_scan_terminal_cache_entry(filters) or {}

    try:
        city_names = list(CITIES.keys())
+        build_timeout_sec = float(
+            timeout_sec
+            if timeout_sec is not None
+            else SCAN_TERMINAL_BUILD_TIMEOUT_SEC
+        )
        timezone_offset = filters.get("timezone_offset_seconds")
        if timezone_offset is not None:
            target_tz = int(timezone_offset)
@@ -116,7 +153,7 @@ def _build_scan_terminal_payload_uncached(
            try:
                completed = as_completed(
                    future_map,
-                    timeout=float(SCAN_TERMINAL_BUILD_TIMEOUT_SEC),
+                    timeout=build_timeout_sec,
                )
                for future in completed:
                    city_name = future_map[future]
@@ -131,8 +168,7 @@ def _build_scan_terminal_payload_uncached(
            except FutureTimeoutError:
                timed_out = True
                timeout_message = (
-                    f"scan terminal build timed out after "
-                    f"{SCAN_TERMINAL_BUILD_TIMEOUT_SEC}s"
+                    f"scan terminal build timed out after {build_timeout_sec:g}s"
                )
                failed_reasons.append(timeout_message)
                for future, city_name in future_map.items():
@@ -175,7 +211,9 @@ def _build_scan_terminal_payload_uncached(
            total_city_count=len(city_names),
            failed_city_count=len(failed_cities),
        )
-        ranked_rows = ranked_result["ranked_rows"]
+        ranked_rows = compact_ranked_scan_rows_for_payload(
+            ranked_result["ranked_rows"]
+        )

        if timed_out and not ranked_rows:
            success_payload = cached_entry.get("success_payload")
@@ -189,6 +227,16 @@ def _build_scan_terminal_payload_uncached(

        summary = ranked_result["summary"]
        top_signal = ranked_result["top_signal"]
+        if timed_out:
+            stale_payload = _build_stale_payload_for_timeout_if_better_cached(
+                filters=filters,
+                cached_entry=cached_entry,
+                ranked_rows=ranked_rows,
+                timeout_message=timeout_message,
+            )
+            if stale_payload is not None:
+                return stale_payload
+
        payload = {
            "generated_at": datetime.utcnow().isoformat() + "Z",
            "filters": filters,
@@ -297,6 +345,50 @@ def build_scan_terminal_payload(

 _SCAN_PREWARM_STARTED = False
 _SCAN_PREWARM_LOCK = threading.Lock()
+_SCAN_TERMINAL_PREWARM_RAW_FILTERS = [
+    {
+        "scan_mode": "tradable",
+        "min_price": 0.05,
+        "max_price": 0.95,
+        "min_edge_pct": 2,
+        "min_liquidity": 500,
+        "market_type": "maxtemp",
+        "time_range": "today",
+        "limit": 25,
+    },
+    {
+        "scan_mode": "tradable",
+        "min_price": 0.05,
+        "max_price": 0.95,
+        "min_edge_pct": 2,
+        "min_liquidity": 500,
+        "market_type": "maxtemp",
+        "time_range": "today",
+        "limit": 180,
+    }
+]
+
+
+def _scan_terminal_prewarm_filters() -> List[Dict[str, Any]]:
+    return [
+        _normalize_scan_terminal_filters(filters)
+        for filters in _SCAN_TERMINAL_PREWARM_RAW_FILTERS
+    ]
+
+
+def _warm_scan_terminal_payloads() -> int:
+    ok = 0
+    for filters in _scan_terminal_prewarm_filters():
+        try:
+            _build_scan_terminal_payload_uncached(
+                filters,
+                force_refresh=False,
+                timeout_sec=SCAN_TERMINAL_PREWARM_PAYLOAD_TIMEOUT_SEC,
+            )
+            ok += 1
+        except Exception as exc:
+            logger.warning("scan terminal payload pre-warm failed: {}", exc)
+    return ok


 def start_scan_terminal_prewarm() -> None:
@@ -340,11 +432,13 @@ def start_scan_terminal_prewarm() -> None:
                        ok += 1
                    except Exception:
                        pass
+            payload_ok = _warm_scan_terminal_payloads()
            elapsed = int(time.time() - started)
            logger.info(
-                "scan terminal pre-warm finished ok={}/{} elapsed={}s",
+                "scan terminal pre-warm finished ok={}/{} payloads={} elapsed={}s",
                ok,
                len(city_names),
+                payload_ok,
                elapsed,
            )
        except (ValueError, OSError, IOError):
@@ -27,11 +27,20 @@ _CITY_FULL_REFRESH_INFLIGHT: Dict[str, "asyncio.Task[Dict[str, Any]]"] = {}
 _CITY_FULL_STALE_REFRESH_TASKS: Dict[str, "asyncio.Task[Dict[str, Any]]"] = {}
 _CITY_FULL_REFRESH_LOCK = asyncio.Lock()
 CityDetailPayloadCacheKey = Tuple[str, str, str, str, str, int]
+CityChartDetailPayloadCacheKey = Tuple[str, str, str, int]
+CityDetailBatchResponseCacheKey = Tuple[Tuple[str, ...], bool, str, str, str, str]
 _CITY_DETAIL_PAYLOAD_CACHE: Dict[CityDetailPayloadCacheKey, Dict[str, Any]] = {}
 _CITY_DETAIL_PAYLOAD_CACHE_TS: Dict[CityDetailPayloadCacheKey, float] = {}
 _CITY_DETAIL_PAYLOAD_INFLIGHT: Dict[CityDetailPayloadCacheKey, "asyncio.Task[Dict[str, Any]]"] = {}
 _CITY_DETAIL_PAYLOAD_EPOCH: Dict[str, int] = {}
 _CITY_DETAIL_PAYLOAD_LOCK = asyncio.Lock()
+_CITY_CHART_DETAIL_PAYLOAD_CACHE: Dict[CityChartDetailPayloadCacheKey, Dict[str, Any]] = {}
+_CITY_CHART_DETAIL_PAYLOAD_CACHE_TS: Dict[CityChartDetailPayloadCacheKey, float] = {}
+_CITY_CHART_DETAIL_PAYLOAD_LOCK = asyncio.Lock()
+_CITY_DETAIL_BATCH_RESPONSE_CACHE: Dict[CityDetailBatchResponseCacheKey, Dict[str, Any]] = {}
+_CITY_DETAIL_BATCH_RESPONSE_CACHE_TS: Dict[CityDetailBatchResponseCacheKey, float] = {}
+_CITY_DETAIL_BATCH_RESPONSE_INFLIGHT: Dict[CityDetailBatchResponseCacheKey, "asyncio.Task[Dict[str, Any]]"] = {}
+_CITY_DETAIL_BATCH_RESPONSE_LOCK = asyncio.Lock()


 def _city_detail_payload_cache_ttl() -> float:
@@ -42,6 +51,17 @@ def _city_detail_payload_cache_ttl() -> float:
    return max(0.0, min(30.0, value))


+def _city_detail_batch_response_cache_ttl() -> float:
+    try:
+        value = float(
+            os.getenv("POLYWEATHER_CITY_DETAIL_BATCH_RESPONSE_CACHE_TTL_SEC", "12")
+            or "12"
+        )
+    except ValueError:
+        value = 12.0
+    return max(0.0, min(30.0, value))
+
+
 async def _overlay_cached_wunderground(city: str, payload: Dict[str, Any]) -> Dict[str, Any]:
    return await run_in_threadpool(
        legacy_routes._overlay_latest_wunderground_current,
@@ -86,6 +106,11 @@ async def _invalidate_city_detail_payload_cache(city: str) -> None:
        for key in old_keys:
            _CITY_DETAIL_PAYLOAD_CACHE.pop(key, None)
            _CITY_DETAIL_PAYLOAD_CACHE_TS.pop(key, None)
+    async with _CITY_CHART_DETAIL_PAYLOAD_LOCK:
+        old_chart_keys = [key for key in _CITY_CHART_DETAIL_PAYLOAD_CACHE if key[0] == normalized]
+        for key in old_chart_keys:
+            _CITY_CHART_DETAIL_PAYLOAD_CACHE.pop(key, None)
+            _CITY_CHART_DETAIL_PAYLOAD_CACHE_TS.pop(key, None)


 async def _refresh_city_full_data(city: str, force_refresh: bool) -> Dict[str, Any]:
@@ -130,6 +155,24 @@ async def _get_city_full_data(city: str, *, force_refresh: bool) -> Dict[str, An
    return await _refresh_city_full_data(city, False)


+async def _get_city_chart_data(city: str, *, force_refresh: bool) -> Dict[str, Any]:
+    if force_refresh:
+        return await _get_city_full_data(city, force_refresh=True)
+
+    cached_entry = await run_in_threadpool(legacy_routes._CACHE_DB.get_city_cache, "full", city)
+    if cached_entry:
+        payload = cached_entry.get("payload") or {}
+        if payload:
+            if not legacy_routes._city_cache_is_fresh(cached_entry, legacy_routes.CITY_FULL_CACHE_TTL_SEC):
+                _start_city_full_stale_refresh(city)
+            return await _overlay_cached_wunderground(city, payload)
+
+    return {
+        "name": city,
+        "display_name": str((legacy_routes.CITY_REGISTRY.get(city, {}) or {}).get("display_name") or city.title()),
+    }
+
+
 def _city_detail_payload_cache_key(
    data: Dict[str, Any],
    market_slug: Optional[str],
@@ -155,6 +198,27 @@ def _city_detail_payload_cache_key(
    )


+def _city_chart_detail_payload_cache_key(
+    data: Dict[str, Any],
+    resolution: Optional[str],
+) -> CityChartDetailPayloadCacheKey:
+    city = str(data.get("city") or data.get("name") or "").strip().lower()
+    fingerprint = str(
+        data.get("updated_at_ts")
+        or data.get("updated_at")
+        or data.get("local_time")
+        or data.get("local_date")
+        or id(data)
+    )
+    generation = _CITY_DETAIL_PAYLOAD_EPOCH.get(city, 0)
+    return (
+        city,
+        str(resolution or "10m"),
+        fingerprint,
+        generation,
+    )
+
+
 async def _build_city_detail_payload_cached(
    data: Dict[str, Any],
    market_slug: Optional[str],
@@ -212,6 +276,39 @@ async def _build_city_detail_payload_cached(
    return payload


+async def _build_city_chart_detail_payload(
+    data: Dict[str, Any],
+    resolution: Optional[str],
+) -> Dict[str, Any]:
+    ttl = _city_detail_payload_cache_ttl()
+    if ttl <= 0:
+        return legacy_routes._build_city_chart_detail_payload(data, resolution)
+
+    key = _city_chart_detail_payload_cache_key(data, resolution)
+    now_ts = time.time()
+    async with _CITY_CHART_DETAIL_PAYLOAD_LOCK:
+        cached = _CITY_CHART_DETAIL_PAYLOAD_CACHE.get(key)
+        cached_ts = _CITY_CHART_DETAIL_PAYLOAD_CACHE_TS.get(key, 0.0)
+        if cached is not None and now_ts - cached_ts < ttl:
+            return cached
+
+    payload = legacy_routes._build_city_chart_detail_payload(data, resolution)
+
+    async with _CITY_CHART_DETAIL_PAYLOAD_LOCK:
+        _CITY_CHART_DETAIL_PAYLOAD_CACHE[key] = payload
+        _CITY_CHART_DETAIL_PAYLOAD_CACHE_TS[key] = time.time()
+        if len(_CITY_CHART_DETAIL_PAYLOAD_CACHE) > 256:
+            oldest_keys = sorted(
+                _CITY_CHART_DETAIL_PAYLOAD_CACHE_TS,
+                key=lambda item: _CITY_CHART_DETAIL_PAYLOAD_CACHE_TS.get(item, 0.0),
+            )[:64]
+            for old_key in oldest_keys:
+                _CITY_CHART_DETAIL_PAYLOAD_CACHE.pop(old_key, None)
+                _CITY_CHART_DETAIL_PAYLOAD_CACHE_TS.pop(old_key, None)
+    return payload
+
+
+
 def _default_deb_recent() -> Dict[str, object]:
    return {
        "tier": "other",
@@ -458,6 +555,99 @@ def _parse_batch_city_names(raw_cities: str, *, limit: int) -> List[str]:
    return out


+def _city_detail_batch_response_cache_key(
+    city_names: List[str],
+    *,
+    force_refresh: bool,
+    market_slug: Optional[str],
+    target_date: Optional[str],
+    resolution: Optional[str],
+    scope: str,
+) -> CityDetailBatchResponseCacheKey:
+    return (
+        tuple(city_names),
+        bool(force_refresh),
+        str(market_slug or ""),
+        str(target_date or ""),
+        str(resolution or "10m"),
+        str(scope or "full"),
+    )
+
+
+def _normalize_city_detail_scope(scope: Optional[str]) -> str:
+    raw = str(scope or "full").strip().lower()
+    if raw in {"chart", "charts", "terminal", "terminal_chart"}:
+        return "chart"
+    return "full"
+
+
+def _chart_scoped_city_detail(detail: Dict[str, Any]) -> Dict[str, Any]:
+    overview = detail.get("overview") if isinstance(detail.get("overview"), dict) else {}
+    timeseries = detail.get("timeseries") if isinstance(detail.get("timeseries"), dict) else {}
+    forecast = detail.get("forecast") if isinstance(detail.get("forecast"), dict) else {}
+    airport_primary_today_obs = (
+        detail.get("airport_primary_today_obs")
+        or overview.get("airport_primary_today_obs")
+        or []
+    )
+    forecast_daily = (
+        (forecast.get("daily") if isinstance(forecast, dict) else None)
+        or timeseries.get("forecast_daily")
+        or []
+    )
+    local_date = detail.get("local_date") or overview.get("local_date")
+    local_time = detail.get("local_time") or overview.get("local_time")
+
+    scoped = {
+        "city": detail.get("city") or overview.get("name"),
+        "fetched_at": detail.get("fetched_at"),
+        "local_date": local_date,
+        "local_time": local_time,
+        "overview": {
+            "name": overview.get("name"),
+            "display_name": overview.get("display_name"),
+            "local_date": local_date,
+            "local_time": local_time,
+            "temp_symbol": overview.get("temp_symbol"),
+            "current_temp": overview.get("current_temp"),
+            "deb_prediction": overview.get("deb_prediction"),
+            "settlement_source": overview.get("settlement_source"),
+            "settlement_source_label": overview.get("settlement_source_label"),
+        },
+        "timeseries": {
+            "hourly": timeseries.get("hourly") or detail.get("hourly") or {},
+            "metar_today_obs": timeseries.get("metar_today_obs") or [],
+            "settlement_today_obs": timeseries.get("settlement_today_obs") or [],
+            "forecast_daily": forecast_daily,
+        },
+        "hourly": timeseries.get("hourly") or detail.get("hourly") or {},
+        "models_hourly": detail.get("models_hourly") or {},
+        "deb": detail.get("deb") or {},
+        "forecast": {
+            "today_high": forecast.get("today_high") if isinstance(forecast, dict) else None,
+            "daily": forecast_daily,
+        },
+        "multi_model_daily": detail.get("multi_model_daily") or {},
+        "probabilities": detail.get("probabilities") or {"mu": None, "distribution": []},
+        "runway_plate_history": detail.get("runway_plate_history") or {},
+        "runway_band_history": detail.get("runway_band_history") or [],
+        "amos": detail.get("amos") or {},
+        "airport_current": detail.get("airport_current") or {},
+        "airport_primary": detail.get("airport_primary") or overview.get("airport_primary") or {},
+        "airport_primary_today_obs": airport_primary_today_obs,
+        "official": {"airport_primary_today_obs": airport_primary_today_obs},
+        "wunderground_current": detail.get("wunderground_current") or {},
+        "settlement_station": detail.get("settlement_station") or overview.get("settlement_station") or {},
+    }
+    return scoped
+
+
+def _apply_city_detail_scope(detail: Dict[str, Any], scope: str) -> Dict[str, Any]:
+    if scope == "chart":
+        return _chart_scoped_city_detail(detail)
+    return detail
+
+
 async def _build_city_detail_batch_item_async(
    city: str,
    *,
@@ -465,8 +655,24 @@ async def _build_city_detail_batch_item_async(
    market_slug: Optional[str],
    target_date: Optional[str],
    resolution: Optional[str],
+    detail_scope: str = "full",
    timing_recorder: Optional[ServerTimingRecorder] = None,
 ) -> Tuple[str, Dict[str, Any]]:
+    if detail_scope == "chart":
+        if timing_recorder is not None:
+            data = await timing_recorder.measure_async(
+                f"chart_data_{city}",
+                lambda: _get_city_chart_data(city, force_refresh=force_refresh),
+            )
+            detail = await timing_recorder.measure_async(
+                f"chart_payload_{city}",
+                lambda: _build_city_chart_detail_payload(data, resolution),
+            )
+        else:
+            data = await _get_city_chart_data(city, force_refresh=force_refresh)
+            detail = await _build_city_chart_detail_payload(data, resolution)
+        return city, detail
+
    if timing_recorder is not None:
        data = await timing_recorder.measure_async(
            f"full_data_{city}",
@@ -489,7 +695,7 @@ async def _build_city_detail_batch_item_async(
            target_date,
            resolution,
        )
-    return city, detail
+    return city, _apply_city_detail_scope(detail, detail_scope)


 def _city_detail_batch_concurrency() -> int:
@@ -521,6 +727,7 @@ async def get_city_detail_batch_payload(
    market_slug: Optional[str] = None,
    target_date: Optional[str] = None,
    resolution: Optional[str] = "10m",
+    scope: Optional[str] = "full",
    limit: int = 12,
 ) -> Dict[str, Any]:
    timer = ServerTimingRecorder(
@@ -548,62 +755,120 @@ async def get_city_detail_batch_payload(
                "missing": [],
                "partial": False,
            }
+        detail_scope = _normalize_city_detail_scope(scope)

-        semaphore = asyncio.Semaphore(_city_detail_batch_concurrency())
+        async def _build_uncached_payload() -> Dict[str, Any]:
+            semaphore = asyncio.Semaphore(_city_detail_batch_concurrency())

-        async def _build_with_limit(city: str) -> Tuple[str, Dict[str, Any]]:
-            async with semaphore:
-                return await _build_city_detail_batch_item_async(
-                    city,
-                    force_refresh=force_refresh,
-                    market_slug=market_slug,
-                    target_date=target_date,
-                    resolution=resolution,
-                    timing_recorder=timer,
-                )
+            async def _build_with_limit(city: str) -> Tuple[str, Dict[str, Any]]:
+                async with semaphore:
+                    return await _build_city_detail_batch_item_async(
+                        city,
+                        force_refresh=force_refresh,
+                        market_slug=market_slug,
+                        target_date=target_date,
+                        resolution=resolution,
+                        detail_scope=detail_scope,
+                        timing_recorder=timer,
+                    )

-        task_by_city = {
-            city: asyncio.create_task(_build_with_limit(city))
-            for city in city_names
-        }
-        task_city_lookup = {task: city for city, task in task_by_city.items()}
-        done, pending = await timer.measure_async(
-            "build_details",
-            lambda: asyncio.wait(
-                task_by_city.values(),
-                timeout=_city_detail_batch_partial_timeout_seconds(),
-            ),
+            task_by_city = {
+                city: asyncio.create_task(_build_with_limit(city))
+                for city in city_names
+            }
+            task_city_lookup = {task: city for city, task in task_by_city.items()}
+            done, pending = await timer.measure_async(
+                "build_details",
+                lambda: asyncio.wait(
+                    task_by_city.values(),
+                    timeout=_city_detail_batch_partial_timeout_seconds(),
+                ),
+            )
+            details: Dict[str, Any] = {}
+            errors: Dict[str, str] = {}
+            missing: List[str] = []
+            for task in done:
+                city = task_city_lookup[task]
+                try:
+                    result_city, payload = task.result()
+                except Exception as exc:
+                    errors[city] = str(exc)
+                    continue
+                details[result_city] = payload
+
+            for task in pending:
+                city = task_city_lookup[task]
+                missing.append(city)
+                task.cancel()
+
+            missing_set = set(missing)
+            missing = [city for city in city_names if city in missing_set]
+            return {
+                "cities": city_names,
+                "details": details,
+                "errors": errors,
+                "missing": missing,
+                "partial": bool(missing or errors),
+            }
+
+        cache_ttl = _city_detail_batch_response_cache_ttl()
+        cache_key = _city_detail_batch_response_cache_key(
+            city_names,
+            force_refresh=force_refresh,
+            market_slug=market_slug,
+            target_date=target_date,
+            resolution=resolution,
+            scope=detail_scope,
        )
-        details: Dict[str, Any] = {}
-        errors: Dict[str, str] = {}
-        missing: List[str] = []
-        for task in done:
-            city = task_city_lookup[task]
+        if cache_ttl > 0 and not force_refresh:
+            now_ts = time.time()
+            async with _CITY_DETAIL_BATCH_RESPONSE_LOCK:
+                cached = _CITY_DETAIL_BATCH_RESPONSE_CACHE.get(cache_key)
+                cached_ts = _CITY_DETAIL_BATCH_RESPONSE_CACHE_TS.get(cache_key, 0.0)
+                if cached is not None and now_ts - cached_ts < cache_ttl:
+                    outcome = "cache_hit"
+                    return cached
+                task = _CITY_DETAIL_BATCH_RESPONSE_INFLIGHT.get(cache_key)
+                owner = False
+                if task is None:
+                    owner = True
+                    task = asyncio.create_task(_build_uncached_payload())
+                    _CITY_DETAIL_BATCH_RESPONSE_INFLIGHT[cache_key] = task
+
            try:
-                result_city, payload = task.result()
-            except Exception as exc:
-                errors[city] = str(exc)
-                continue
-            details[result_city] = payload
+                payload = await timer.measure_async(
+                    "build_or_wait_cached_batch",
+                    lambda: task,
+                )
+            finally:
+                if owner and task.done():
+                    async with _CITY_DETAIL_BATCH_RESPONSE_LOCK:
+                        if _CITY_DETAIL_BATCH_RESPONSE_INFLIGHT.get(cache_key) is task:
+                            _CITY_DETAIL_BATCH_RESPONSE_INFLIGHT.pop(cache_key, None)
+            if payload.get("partial"):
+                outcome = "partial"
+            elif not owner:
+                outcome = "shared_inflight"

-        for task in pending:
-            city = task_city_lookup[task]
-            missing.append(city)
-            task.cancel()
+            if owner:
+                async with _CITY_DETAIL_BATCH_RESPONSE_LOCK:
+                    if not payload.get("partial"):
+                        _CITY_DETAIL_BATCH_RESPONSE_CACHE[cache_key] = payload
+                        _CITY_DETAIL_BATCH_RESPONSE_CACHE_TS[cache_key] = time.time()
+                        if len(_CITY_DETAIL_BATCH_RESPONSE_CACHE) > 128:
+                            oldest_keys = sorted(
+                                _CITY_DETAIL_BATCH_RESPONSE_CACHE_TS,
+                                key=lambda item: _CITY_DETAIL_BATCH_RESPONSE_CACHE_TS.get(item, 0.0),
+                            )[:32]
+                            for old_key in oldest_keys:
+                                _CITY_DETAIL_BATCH_RESPONSE_CACHE.pop(old_key, None)
+                                _CITY_DETAIL_BATCH_RESPONSE_CACHE_TS.pop(old_key, None)
+            return payload

-        missing_set = set(missing)
-        missing = [city for city in city_names if city in missing_set]
-        partial = bool(missing or errors)
-        if partial:
+        payload = await _build_uncached_payload()
+        if payload.get("partial"):
            outcome = "partial"
-
-        return {
-            "cities": city_names,
-            "details": details,
-            "errors": errors,
-            "missing": missing,
-            "partial": partial,
-        }
+        return payload
    except HTTPException as exc:
        outcome = f"http_{exc.status_code}"
        status_code = exc.status_code
@@ -161,6 +161,151 @@ def build_runway_band_history(raw_history: Dict[str, List[Dict[str, Any]]], reso
    return band_history


+def build_runway_chart_histories(
+    raw_history: Dict[str, List[Dict[str, Any]]],
+    resolution: str,
+) -> tuple[Dict[str, List[Dict[str, Any]]], List[Dict[str, Any]]]:
+    if not raw_history:
+        return {}, []
+
+    try:
+        if resolution.endswith("m"):
+            minutes = int(resolution[:-1])
+        elif resolution.endswith("h"):
+            minutes = int(resolution[:-1]) * 60
+        else:
+            minutes = 10
+    except Exception:
+        minutes = 10
+
+    seconds = max(60, minutes * 60)
+    per_runway_buckets: Dict[str, Dict[int, List[float]]] = {}
+    all_buckets: Dict[int, List[float]] = {}
+
+    for rwy, points in raw_history.items():
+        if not points:
+            continue
+        rwy_key = str(rwy or "").strip()
+        if not rwy_key:
+            continue
+        runway_buckets = per_runway_buckets.setdefault(rwy_key, {})
+        for pt in points:
+            t_str = pt.get("time") or pt.get("timestamp")
+            temp = pt.get("temp") or pt.get("temp_c") or pt.get("value")
+            if temp is None or not isinstance(t_str, str):
+                continue
+            dt = _parse_time_val(t_str)
+            if not dt:
+                continue
+            try:
+                temp_value = float(temp)
+            except Exception:
+                continue
+
+            bucket_ts = (int(dt.timestamp()) // seconds) * seconds
+            runway_buckets.setdefault(bucket_ts, []).append(temp_value)
+            all_buckets.setdefault(bucket_ts, []).append(temp_value)
+
+    aggregated_history: Dict[str, List[Dict[str, Any]]] = {}
+    for rwy, buckets in per_runway_buckets.items():
+        bucket_points = []
+        for bucket_ts in sorted(buckets.keys()):
+            temps = buckets[bucket_ts]
+            if not temps:
+                continue
+            bucket_dt = datetime.fromtimestamp(bucket_ts, tz=timezone.utc)
+            bucket_points.append(
+                {
+                    "time": bucket_dt.isoformat(),
+                    "temp": round(temps[-1], 1),
+                }
+            )
+        if bucket_points:
+            aggregated_history[rwy] = bucket_points
+
+    band_history = []
+    for bucket_ts in sorted(all_buckets.keys()):
+        temps = all_buckets[bucket_ts]
+        if not temps:
+            continue
+        bucket_dt = datetime.fromtimestamp(bucket_ts, tz=timezone.utc)
+        band_history.append(
+            {
+                "time": bucket_dt.isoformat(),
+                "high_temp": round(max(temps), 1),
+                "low_temp": round(min(temps), 1),
+                "avg_temp": round(sum(temps) / len(temps), 1),
+            }
+        )
+
+    return aggregated_history, band_history
+
+
+def build_city_chart_detail_payload(
+    data: Dict[str, Any],
+    resolution: Optional[str] = "10m",
+) -> Dict[str, Any]:
+    forecast = data.get("forecast") if isinstance(data.get("forecast"), dict) else {}
+    current = data.get("current") if isinstance(data.get("current"), dict) else {}
+    multi_model = data.get("multi_model") if isinstance(data.get("multi_model"), dict) else {}
+    runway_history, runway_band_history = build_runway_chart_histories(
+        data.get("runway_plate_history") or {},
+        resolution or "10m",
+    )
+    airport_primary_today_obs = data.get("airport_primary_today_obs") or []
+    local_date = data.get("local_date")
+    local_time = data.get("local_time")
+
+    return {
+        "city": data.get("name") or data.get("city"),
+        "fetched_at": data.get("updated_at"),
+        "local_date": local_date,
+        "local_time": local_time,
+        "overview": {
+            "name": data.get("name") or data.get("city"),
+            "display_name": data.get("display_name"),
+            "local_date": local_date,
+            "local_time": local_time,
+            "temp_symbol": data.get("temp_symbol"),
+            "current_temp": current.get("temp"),
+            "deb_prediction": (data.get("deb") or {}).get("prediction"),
+            "settlement_source": current.get("settlement_source"),
+            "settlement_source_label": current.get("settlement_source_label"),
+        },
+        "timeseries": {
+            "hourly": data.get("hourly") or {},
+            "metar_today_obs": data.get("metar_today_obs") or [],
+            "settlement_today_obs": data.get("settlement_today_obs") or [],
+            "forecast_daily": forecast.get("daily") or [],
+        },
+        "hourly": data.get("hourly") or {},
+        "models_hourly": {
+            "times": multi_model.get("hourly_times") or [],
+            "curves": {
+                model: values
+                for model, values in (multi_model.get("hourly_forecasts") or {}).items()
+                if not _is_excluded_model_name(model)
+            },
+        },
+        "deb": data.get("deb") or {},
+        "forecast": {
+            "today_high": forecast.get("today_high"),
+            "daily": forecast.get("daily") or [],
+        },
+        "multi_model_daily": data.get("multi_model_daily") or {},
+        "probabilities": data.get("probabilities") or {"mu": None, "distribution": []},
+        "runway_plate_history": runway_history,
+        "runway_band_history": runway_band_history,
+        "amos": data.get("amos") or {},
+        "airport_current": data.get("airport_current") or {},
+        "airport_primary": data.get("airport_primary") or {},
+        "airport_primary_today_obs": airport_primary_today_obs,
+        "official": {"airport_primary_today_obs": airport_primary_today_obs},
+        "wunderground_current": data.get("wunderground_current") or {},
+        "settlement_station": data.get("settlement_station") or {},
+    }
+
+
 def build_city_detail_payload(
    data: Dict[str, Any],
    market_slug: Optional[str] = None,
@@ -25,6 +25,7 @@ from src.utils.refresh_policy import OBSERVATION_REFRESH_SEC, SCAN_ROWS_REFRESH_
 from web.analysis_service import (
    _analyze,
    _analyze_summary,
+    _build_city_chart_detail_payload,  # noqa: F401 - compatibility export for chart detail batches
    _build_city_detail_payload,  # noqa: F401 - compatibility export for tests and transitional routers
    _build_city_market_scan_payload,
    _build_city_summary_payload,
@@ -545,18 +545,41 @@ def get_ops_billing_risk(
            "limit": str(max(safe_limit * 10, 500)),
        },
    )
-    subscription_rows = collect(
+    trial_subscription_rows = collect(
        "subscriptions",
        {
            "select": (
                "id,user_id,plan_code,source,status,starts_at,expires_at,"
                "created_at,updated_at"
            ),
-            "or": "(source.eq.signup_trial,plan_code.eq.signup_trial_3d,status.eq.active)",
+            "or": "(source.eq.signup_trial,plan_code.eq.signup_trial_3d)",
            "order": "created_at.desc",
            "limit": str(max(safe_limit * 20, 1000)),
        },
    )
+    active_subscription_rows = collect(
+        "subscriptions",
+        {
+            "select": (
+                "id,user_id,plan_code,source,status,starts_at,expires_at,"
+                "created_at,updated_at"
+            ),
+            "status": "eq.active",
+            "order": "created_at.desc",
+            "limit": str(max(safe_limit * 20, 1000)),
+        },
+    )
+    subscription_rows: List[Dict[str, Any]] = []
+    seen_subscription_keys: set[str] = set()
+    for row in [*trial_subscription_rows, *active_subscription_rows]:
+        key = str(row.get("id") or "").strip() or (
+            f"{row.get('user_id')}:{row.get('plan_code')}:{row.get('source')}:"
+            f"{row.get('starts_at')}:{row.get('expires_at')}"
+        )
+        if key in seen_subscription_keys:
+            continue
+        seen_subscription_keys.add(key)
+        subscription_rows.append(row)
    entitlement_trial_events = collect(
        "entitlement_events",
        {
@@ -751,6 +774,40 @@ def get_ops_billing_risk(
    def normalize_user_key(value: Any) -> str:
        return str(value or "").strip().lower()

+    def analytics_payload(row: Dict[str, Any]) -> Dict[str, Any]:
+        payload = row.get("payload")
+        return payload if isinstance(payload, dict) else {}
+
+    def analytics_correlation_keys(row: Dict[str, Any]) -> set[str]:
+        payload = analytics_payload(row)
+        keys: set[str] = set()
+        user_id = normalize_user_key(row.get("user_id") or payload.get("user_id"))
+        client_id = str(row.get("client_id") or "").strip()
+        session_id = str(row.get("session_id") or "").strip()
+        if user_id:
+            keys.add(f"user:{user_id}")
+        if client_id:
+            keys.add(f"client:{client_id}")
+        if session_id:
+            keys.add(f"session:{session_id}")
+        return keys
+
+    signup_intent_keys: set[str] = set()
+    for row in events:
+        if str(row.get("event_type") or "").strip().lower() != "login_start":
+            continue
+        payload = analytics_payload(row)
+        mode = str(payload.get("mode") or payload.get("auth_mode") or "").strip().lower()
+        if mode == "signup":
+            signup_intent_keys.update(analytics_correlation_keys(row))
+
+    def has_signup_intent(row: Dict[str, Any]) -> bool:
+        payload = analytics_payload(row)
+        mode = str(payload.get("mode") or payload.get("auth_mode") or "").strip().lower()
+        if mode == "signup" or payload.get("signup_intent") is True:
+            return True
+        return bool(analytics_correlation_keys(row).intersection(signup_intent_keys))
+
    trial_actor_keys = {
        _app_analytics_actor_key(row)
        for row in events
@@ -817,10 +874,12 @@ def get_ops_billing_risk(
            )

    for row in signup_rows[:300]:
+        if not has_signup_intent(row):
+            continue
        actor_key = _app_analytics_actor_key(row)
        if actor_key in trial_actor_keys:
            continue
-        payload = row.get("payload") if isinstance(row.get("payload"), dict) else {}
+        payload = analytics_payload(row)
        signup_user_id = normalize_user_key(row.get("user_id") or payload.get("user_id"))
        if not signup_user_id:
            continue
@@ -31,10 +31,16 @@ SCAN_TERMINAL_PAYLOAD_TTL_SEC = min(
 )
 SCAN_TERMINAL_BUILD_TIMEOUT_SEC = _env_int(
    "POLYWEATHER_SCAN_TERMINAL_BUILD_TIMEOUT_SEC",
-    30,
+    10,
    min_value=8,
    max_value=30,
 )
+SCAN_TERMINAL_PREWARM_PAYLOAD_TIMEOUT_SEC = _env_int(
+    "POLYWEATHER_SCAN_TERMINAL_PREWARM_PAYLOAD_TIMEOUT_SEC",
+    30,
+    min_value=10,
+    max_value=120,
+)
 SCAN_TERMINAL_MAX_WORKERS = _env_int(
    "POLYWEATHER_SCAN_TERMINAL_MAX_WORKERS",
    8,
@@ -5,7 +5,7 @@ from __future__ import annotations
 import time
 from typing import Any, Dict, Optional

-from fastapi import BackgroundTasks, HTTPException, Request
+from fastapi import BackgroundTasks, Request
 from fastapi.concurrency import run_in_threadpool
 from fastapi.responses import PlainTextResponse
 from loguru import logger
@@ -16,10 +16,7 @@ import web.routes as legacy_routes


 def get_health_payload() -> Dict[str, Any]:
-    payload = build_health_payload()
-    if payload.get("status") != "ok":
-        raise HTTPException(status_code=503, detail=payload)
-    return payload
+    return build_health_payload()


 async def get_system_status_payload() -> Dict[str, Any]:
Author	SHA1	Message	Date
2569718930@qq.com	49cb0bb42d	Prevent terminal auth spinner deadlock	2026-06-01 12:36:29 +08:00
2569718930@qq.com	fb6c354317	Avoid terminal full-detail fallback overload	2026-06-01 12:06:46 +08:00
2569718930@qq.com	fee402145e	Slim terminal chart detail batches	2026-06-01 11:37:16 +08:00
2569718930@qq.com	d1633331bc	Load terminal chart canvas eagerly	2026-06-01 07:05:08 +08:00
2569718930@qq.com	6e00160897	Version scan terminal cache key	2026-06-01 06:46:34 +08:00
2569718930@qq.com	6bc53c6e5d	Slim deferred scan runway history	2026-06-01 06:25:27 +08:00
2569718930@qq.com	7625a99020	Cache terminal city registry fallback	2026-06-01 06:09:44 +08:00
2569718930@qq.com	3447a043ff	Preload terminal chart canvas	2026-06-01 05:56:09 +08:00
2569718930@qq.com	10cf557b11	Batch deferred chart detail loads	2026-06-01 02:56:13 +08:00
2569718930@qq.com	eaf17c7a32	Align scan prewarm observability test	2026-06-01 02:35:23 +08:00
2569718930@qq.com	14526d6ce8	Prewarm default scan terminal payload	2026-06-01 02:06:40 +08:00
2569718930@qq.com	9a0d7ae444	Persist scan terminal cache in Redis	2026-06-01 01:53:54 +08:00
2569718930@qq.com	de5083ef18	Defer secondary chart detail loads	2026-06-01 01:27:53 +08:00
2569718930@qq.com	2424b68532	Compact scan runway history payload	2026-06-01 01:03:33 +08:00
2569718930@qq.com	ff2a3da100	Use longer timeout for scan prewarm	2026-06-01 00:30:25 +08:00
2569718930@qq.com	7040598e26	Prewarm terminal scan payload	2026-06-01 00:14:12 +08:00
2569718930@qq.com	22f4ac1f26	Preserve scan cache on timeout	2026-05-31 23:54:35 +08:00
2569718930@qq.com	3e5ff4ea8f	Isolate scan prewarm to web service	2026-05-31 23:31:32 +08:00
2569718930@qq.com	39c7c1903c	Shorten cold scan terminal timeout	2026-05-31 22:54:43 +08:00
2569718930@qq.com	eecaa48ec2	Limit city detail fallback to batch failures	2026-05-31 22:34:28 +08:00
2569718930@qq.com	d911af1225	Reduce duplicate terminal detail loads	2026-05-31 22:14:17 +08:00
2569718930@qq.com	38c6cefb27	Direct resync stale SSE clients	2026-05-31 21:48:09 +08:00
2569718930@qq.com	a3df2e00dc	Clamp SSE replay window on backend	2026-05-31 21:33:35 +08:00
2569718930@qq.com	fde69123cd	Merge branch 'codex/signup-trial-reconcile'	2026-05-31 21:25:58 +08:00
2569718930@qq.com	2d963c16f3	Coalesce terminal chart detail loads	2026-05-31 21:17:38 +08:00
2569718930@qq.com	071d749ef0	Reduce terminal detail refresh traffic	2026-05-31 21:01:11 +08:00
2569718930@qq.com	8d552a9279	Scale SSE replay window by visible cities	2026-05-31 20:33:04 +08:00
2569718930@qq.com	9c5a08dc1e	Reduce false signup trial risk alerts	2026-05-31 20:21:57 +08:00
2569718930@qq.com	ada5f274d3	Debounce terminal SSE subscription reconnects	2026-05-31 20:15:39 +08:00