diff --git a/apps/backend/src/repositories/realtime-event-repo.ts b/apps/backend/src/repositories/realtime-event-repo.ts
index 31b40d11..bcc2c6f8 100644
--- a/apps/backend/src/repositories/realtime-event-repo.ts
+++ b/apps/backend/src/repositories/realtime-event-repo.ts
@@ -62,10 +62,13 @@ export async function createRealtimeEvent(input: {
 export async function listRealtimeEventsAfter(eventId: number, limit = 500) {
   const result = await query<RealtimeEventRow>(
     `
-      SELECT * FROM realtime_events
-      WHERE id > $1
+      SELECT * FROM (
+        SELECT * FROM realtime_events
+        WHERE id > $1
+        ORDER BY id DESC
+        LIMIT $2
+      ) replay_window
       ORDER BY id ASC
-      LIMIT $2
     `,
     [Math.max(0, Number(eventId) || 0), Math.min(500, Math.max(1, Number(limit) || 500))],
   )
diff --git a/apps/backend/src/services/realtime/realtime-event-service.ts b/apps/backend/src/services/realtime/realtime-event-service.ts
index c99eee1f..b2572084 100644
--- a/apps/backend/src/services/realtime/realtime-event-service.ts
+++ b/apps/backend/src/services/realtime/realtime-event-service.ts
@@ -85,6 +85,24 @@ let nextSubscriberId = 1
 let heartbeatTimer: NodeJS.Timeout | null = null
 let publishQueue: Promise<void> = Promise.resolve()
 
+/**
+ * 单次补发的事件上限，与 realtime_events 表保留的条数一致
+ * （见 realtime-event-repo 的清理策略：只保留最近 500 条）。
+ */
+export const REALTIME_REPLAY_EVENT_LIMIT = 500
+
+/**
+ * 是否应该补发历史事件。
+ *
+ * 只有断线重连带上了 Last-Event-ID（游标 > 0）才补发。新连接（游标 = 0）**不补发**：
+ * 补发的每一条都携带「事件发生那一刻」的工单快照，直接打进刚由列表接口加载好的缓存，
+ * 会把已涨价/已拼满的订单覆盖回旧值（表现为「进大厅显示旧单价旧进度，点一次刷新才对」）。
+ */
+export function shouldReplayRealtimeEvents(lastEventId: number): boolean {
+  const normalized = Number(lastEventId)
+  return Number.isFinite(normalized) && normalized > 0
+}
+
 /** 建立后台实时事件流，事件快照用于前端定点更新缓存。 */
 export function openAdminRealtimeStream(response: Response, lastEventId = 0) {
   return openRealtimeStream(response, null, lastEventId)
@@ -532,7 +550,10 @@ function openRealtimeStream(response: Response, workerId: number | null, lastEve
     connectedAt: new Date().toISOString(),
     lastEventId: Math.max(0, Number(lastEventId) || 0),
   })
-  void replayEvents(subscriber, Math.max(0, Number(lastEventId) || 0))
+  // 新连接不补发历史事件，只有断线重连（带游标）才回放缺失的增量。
+  if (shouldReplayRealtimeEvents(lastEventId)) {
+    void replayEvents(subscriber, Number(lastEventId))
+  }
   ensureHeartbeat()
 
   response.on('close', () => {
@@ -542,7 +563,16 @@ function openRealtimeStream(response: Response, workerId: number | null, lastEve
 }
 
 async function replayEvents(subscriber: RealtimeSubscriber, lastEventId: number) {
-  const events = await listRealtimeEventsAfter(lastEventId)
+  const events = await listRealtimeEventsAfter(lastEventId, REALTIME_REPLAY_EVENT_LIMIT)
+  // 补发窗口被拿满 = 更早的事件已经从事件表里滚掉（断线太久）。
+  // 这时逐条套用旧快照只会把列表写回旧值，直接让客户端整体重拉一次。
+  if (events.length >= REALTIME_REPLAY_EVENT_LIMIT) {
+    writeEvent(subscriber, 'resync', {
+      headEventId: Number(events[events.length - 1]?.id || 0),
+      reason: 'replay_window_overflow',
+    })
+    return
+  }
   for (const row of events) {
     const event = mapStoredEvent(row)
     if (event.eventId <= lastEventId || !isEventVisibleToSubscriber(event, subscriber)) continue
diff --git a/apps/backend/src/services/realtime/realtime-replay.test.ts b/apps/backend/src/services/realtime/realtime-replay.test.ts
index 7df17f5c..de60e5ee 100644
--- a/apps/backend/src/services/realtime/realtime-replay.test.ts
+++ b/apps/backend/src/services/realtime/realtime-replay.test.ts
@@ -1,4 +1,5 @@
 import assert from 'node:assert/strict'
+import fs from 'node:fs'
 import test from 'node:test'
 
 import { shouldReplayRealtimeEvents } from './realtime-event-service.js'
@@ -20,3 +21,36 @@ test('断线重连（带 Last-Event-ID）才补发事件', () => {
   assert.equal(shouldReplayRealtimeEvents(1), true)
   assert.equal(shouldReplayRealtimeEvents(3993659), true)
 })
+
+test('补发窗口取最新的一段，而不是最旧的一段', () => {
+  const source = fs.readFileSync(
+    new URL('../../repositories/realtime-event-repo.ts', import.meta.url),
+    'utf8',
+  )
+  const block = source.slice(
+    source.indexOf('export async function listRealtimeEventsAfter('),
+    source.indexOf('\n}', source.indexOf('export async function listRealtimeEventsAfter(')),
+  )
+  assert.ok(block.length > 0, 'listRealtimeEventsAfter 片段必须存在')
+  assert.ok(
+    /ORDER BY id DESC\s+LIMIT \$2\s+\)\s*replay_window\s+ORDER BY id ASC/s.test(block),
+    '补发必须「内层 id DESC 取最新 N 条、外层 id ASC 回放」；否则断线久了窗口会停在旧事件上',
+  )
+})
+
+test('补发窗口溢出时改为让客户端整体重拉', () => {
+  const source = fs.readFileSync(new URL('./realtime-event-service.ts', import.meta.url), 'utf8')
+  const replayBlock = source.slice(
+    source.indexOf('async function replayEvents('),
+    source.indexOf('function mapStoredEvent('),
+  )
+  assert.ok(replayBlock.length > 0, 'replayEvents 片段必须存在')
+  assert.ok(
+    replayBlock.includes('events.length >= REALTIME_REPLAY_EVENT_LIMIT'),
+    '补发窗口被拿满时必须判定为溢出，不能继续逐条套用旧快照',
+  )
+  assert.ok(
+    replayBlock.includes("'resync'"),
+    '溢出时要给客户端发 resync，让列表整体重拉（接口才是权威数据源）',
+  )
+})
diff --git a/apps/frontend/src/hooks/useRealtimeEvents.ts b/apps/frontend/src/hooks/useRealtimeEvents.ts
index f22d5900..ea3c88cc 100644
--- a/apps/frontend/src/hooks/useRealtimeEvents.ts
+++ b/apps/frontend/src/hooks/useRealtimeEvents.ts
@@ -21,6 +21,13 @@ type UseRealtimeEventsOptions = {
   token: string
   onEvent: (event: RealtimeEvent) => void
   onConnected?: () => void
+  /**
+   * 服务端告知「补发窗口溢出，历史事件已不连续」。
+   *
+   * 此时不能再依赖逐条快照补丁（会把列表写回旧值），调用方应整体失效对应查询，
+   * 让列表接口重新给出权威数据。
+   */
+  onResync?: (info: { headEventId: number; reason: string }) => void
   /** 鉴权失效（401/403）时触发：连接停止重连，调用方应清理会话并跳转登录页。 */
   onAuthExpired?: () => void
 }
@@ -33,13 +40,16 @@ export function useRealtimeEvents({
   token,
   onEvent,
   onConnected,
+  onResync,
   onAuthExpired,
 }: UseRealtimeEventsOptions) {
   const onEventRef = useRef(onEvent)
   const onConnectedRef = useRef(onConnected)
+  const onResyncRef = useRef(onResync)
   const onAuthExpiredRef = useRef(onAuthExpired)
   onEventRef.current = onEvent
   onConnectedRef.current = onConnected
+  onResyncRef.current = onResync
   onAuthExpiredRef.current = onAuthExpired
 
   useEffect(() => {
@@ -79,6 +89,15 @@ export function useRealtimeEvents({
           }
           onConnectedRef.current?.()
           await readSseStream(response.body, (eventName, data) => {
+            // 补发窗口溢出：历史事件不连续，不能逐条复位快照，交给调用方整体重拉。
+            if (eventName === 'resync') {
+              const notice = normalizeResyncNotice(data)
+              if (notice) {
+                lastEventId = Math.max(lastEventId, notice.headEventId)
+                onResyncRef.current?.(notice)
+              }
+              return
+            }
             if (eventName !== 'realtime') return
             const event = normalizeRealtimeEvent(data)
             if (event) {
@@ -197,3 +216,16 @@ function normalizeRealtimeEvent(value: string): RealtimeEvent | null {
     return null
   }
 }
+
+/** 服务端 resync 通知：补发窗口溢出，客户端应把游标推进到 headEventId 并整体重拉。 */
+function normalizeResyncNotice(value: string): { headEventId: number; reason: string } | null {
+  try {
+    const parsed = JSON.parse(value) as { headEventId?: unknown; reason?: unknown }
+    return {
+      headEventId: Math.max(0, Number(parsed.headEventId) || 0),
+      reason: String(parsed.reason || ''),
+    }
+  } catch {
+    return null
+  }
+}
diff --git a/apps/frontend/src/layouts/AdminLayout.tsx b/apps/frontend/src/layouts/AdminLayout.tsx
index babc4e64..edb35e1f 100644
--- a/apps/frontend/src/layouts/AdminLayout.tsx
+++ b/apps/frontend/src/layouts/AdminLayout.tsx
@@ -119,6 +119,16 @@ export default function AdminLayout() {
     url: '/api/v1/admin/realtime',
     token: role === 'finance' ? '' : getAdminToken(),
     onEvent: (event) => applyAdminRealtimeEvent(event, queryClient),
+    // 补发窗口溢出（断线太久）：历史事件已不连续，整体失效让接口重新给权威数据。
+    onResync: () => {
+      void queryClient.invalidateQueries({ queryKey: ['admin-worker-platform-orders'] })
+      void queryClient.invalidateQueries({ queryKey: ['admin-worker-platform-after-sales-cases'] })
+      void queryClient.invalidateQueries({ queryKey: ['admin-worker-platform-finance-requests'] })
+      void queryClient.invalidateQueries({ queryKey: ['admin-notifications'] })
+      void queryClient.invalidateQueries({ queryKey: ['admin-tasks'] })
+      void queryClient.invalidateQueries({ queryKey: ['admin-orders'] })
+      void queryClient.invalidateQueries({ queryKey: ['admin-dashboard-summary'] })
+    },
     // 会话过期时清登录态回登录页，避免 SSE 带着失效 token 无限重连刷 401。
     onAuthExpired: () => {
       clearAdminSession()
diff --git a/apps/frontend/src/layouts/WorkerLayout.tsx b/apps/frontend/src/layouts/WorkerLayout.tsx
index 26c34b48..d697d8c0 100644
--- a/apps/frontend/src/layouts/WorkerLayout.tsx
+++ b/apps/frontend/src/layouts/WorkerLayout.tsx
@@ -138,6 +138,16 @@ export default function WorkerLayout() {
     url: '/api/v1/worker/realtime',
     token: getWorkerToken(),
     onEvent: (event) => applyWorkerRealtimeEvent(event, queryClient),
+    // 补发窗口溢出（断线太久）：历史事件已不连续，逐条套旧快照会把列表写回旧值，
+    // 这里整体失效，让列表接口重新给权威数据。
+    onResync: () => {
+      void queryClient.invalidateQueries({ queryKey: ['worker-hall-orders'] })
+      void queryClient.invalidateQueries({ queryKey: ['worker-my-orders'] })
+      void queryClient.invalidateQueries({ queryKey: ['worker-my-orders-overview'] })
+      void queryClient.invalidateQueries({ queryKey: ['worker-after-sales-cases'] })
+      void queryClient.invalidateQueries({ queryKey: ['worker-finance-requests'] })
+      void queryClient.invalidateQueries({ queryKey: ['worker-profile'] })
+    },
     // 会话过期时清登录态回登录页，避免 SSE 带着失效 token 无限重连刷 401。
     onAuthExpired: () => {
       expireWorkerSession()