diff --git a/frontend/src/api/modules/accounts.ts b/frontend/src/api/modules/accounts.ts
index 93032278d..60bad13b4 100644
--- a/frontend/src/api/modules/accounts.ts
+++ b/frontend/src/api/modules/accounts.ts
@@ -207,7 +207,16 @@ interface AccountOAuthStartParam {
   accountId?: string
 }
 
-interface AccountOAuthCompleteParam { flowId: string, callbackUrl: string }
+interface AccountOAuthCompleteParam {
+  provider: string
+  flowId: string
+  callbackUrl: string
+}
+
+interface AccountExportParam {
+  accountIds: string
+  confirm: string
+}
 
 export function getAccounts(data: AccountListParams) {
   return request<AccountListResponse>({
@@ -217,7 +226,7 @@ export function getAccounts(data: AccountListParams) {
   })
 }
 
-export function exportAccounts(data: AccountListParams) {
+export function exportAccounts(data: AccountExportParam) {
   return request<unknown>({
     url: '/api/admin/accounts/export',
     method: 'GET',
diff --git a/frontend/src/stores/modules/system-update.ts b/frontend/src/stores/modules/system-update.ts
index 4484cd37a..70902e9d5 100644
--- a/frontend/src/stores/modules/system-update.ts
+++ b/frontend/src/stores/modules/system-update.ts
@@ -24,16 +24,32 @@ interface SystemUpdateEvent {
   level: string
   message: string
   at: string
+  step?: string
   terminal?: boolean
 }
 
+// 单一更新阶段状态机：互斥的操作态无法被类型同时表达。
+type SystemUpdatePhase
+  = | { kind: 'idle' }
+    | { kind: 'loading' }
+    | { kind: 'checking' }
+    | { kind: 'ready' }
+    | { kind: 'updating' }
+    | { kind: 'restart_required' }
+    | { kind: 'restarting' }
+    | { kind: 'failed' }
+
+const UPDATE_BUSY_PHASES = new Set<SystemUpdatePhase['kind']>([
+  'loading',
+  'checking',
+  'updating',
+  'restarting',
+])
+
 export const useSystemUpdateStore = defineStore('system-update', () => {
   const version = shallowRef<Awaited<ReturnType<typeof getSystemVersion>> | null>(null)
   const updateInfo = shallowRef<Awaited<ReturnType<typeof getSystemUpdateDetail>> | null>(null)
-  const loading = shallowRef(false)
-  const checking = shallowRef(false)
-  const updating = shallowRef(false)
-  const restarting = shallowRef(false)
+  const phase = shallowRef<SystemUpdatePhase>({ kind: 'idle' })
   const updateError = shallowRef('')
   const updateSuccess = shallowRef(false)
   const needRestart = shallowRef(false)
@@ -61,6 +77,12 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
   let loadVersionPromise: ReturnType<typeof getSystemVersion> | undefined
   let loadSystemPromise: Promise<void> | undefined
 
+  const phaseKind = computed(() => phase.value.kind)
+  const loading = computed(() => phaseKind.value === 'loading')
+  const checking = computed(() => phaseKind.value === 'checking')
+  const updating = computed(() => phaseKind.value === 'updating')
+  const restarting = computed(() => phaseKind.value === 'restarting')
+
   const hasUpdate = computed(() => Boolean(updateInfo.value?.hasUpdate ?? version.value?.hasUpdate))
   const isReleaseBuild = computed(() => updateInfo.value?.buildType === 'release')
   const canUpdate = computed(
@@ -68,11 +90,13 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
       hasUpdate.value
       && isReleaseBuild.value
       && Boolean(updateInfo.value?.updateSupported)
-      && !updating.value
-      && !checking.value
-      && !restarting.value,
+      && !UPDATE_BUSY_PHASES.has(phaseKind.value),
   )
 
+  function setPhase(next: SystemUpdatePhase) {
+    phase.value = next
+  }
+
   function resetUpdateResult() {
     updateError.value = ''
     updateSuccess.value = false
@@ -149,7 +173,9 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
     if (loadSystemPromise)
       return loadSystemPromise
 
-    loading.value = true
+    if (!UPDATE_BUSY_PHASES.has(phaseKind.value)) {
+      setPhase({ kind: 'loading' })
+    }
     loadSystemPromise = (async () => {
       updateInfo.value = await getSystemUpdateDetail({ refresh })
       if (!version.value)
@@ -161,7 +187,8 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
       await loadSystemPromise
     }
     finally {
-      loading.value = false
+      if (phaseKind.value === 'loading')
+        setPhase({ kind: 'ready' })
       loadSystemPromise = undefined
     }
   }
@@ -185,7 +212,7 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
     if (checking.value)
       return updateInfo.value
 
-    checking.value = true
+    setPhase({ kind: 'checking' })
     resetUpdateResult()
     try {
       updateInfo.value = await getSystemUpdateDetail({ refresh })
@@ -195,7 +222,8 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
       return updateInfo.value
     }
     finally {
-      checking.value = false
+      if (phaseKind.value === 'checking')
+        setPhase({ kind: 'ready' })
     }
   }
 
@@ -207,7 +235,7 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
 
     clearUpdateLogs()
     await connectUpdateEvents(true)
-    updating.value = true
+    setPhase({ kind: 'updating' })
     updateError.value = ''
     updateSuccess.value = false
     try {
@@ -220,6 +248,7 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
         latestVersion: result.targetVersion,
         hasUpdate: false,
       }
+      setPhase(result.needRestart ? { kind: 'restart_required' } : { kind: 'ready' })
       return result
     }
     catch (error: unknown) {
@@ -230,11 +259,9 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
         message: updateError.value,
         at: new Date().toISOString(),
       })
+      setPhase({ kind: 'failed' })
       throw error
     }
-    finally {
-      updating.value = false
-    }
   }
 
   async function waitForServiceAndReload() {
@@ -260,7 +287,7 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
     }
 
     updateError.value = `服务未在预期时间内启动 v${expectedVersion}`
-    restarting.value = false
+    setPhase({ kind: 'failed' })
   }
 
   async function restartNow() {
@@ -270,10 +297,11 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
     if (!restartTargetVersion.value) {
       const error = new Error('缺少待生效的目标版本')
       updateError.value = error.message
+      setPhase({ kind: 'failed' })
       throw error
     }
 
-    restarting.value = true
+    setPhase({ kind: 'restarting' })
     updateError.value = ''
     disconnectUpdateEvents()
 
@@ -282,7 +310,7 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
     }
     catch (error: unknown) {
       if (error instanceof ApiError && error.status > 0) {
-        restarting.value = false
+        setPhase({ kind: 'failed' })
         updateError.value = errorMessage(error, '重启失败')
         throw error
       }
@@ -294,6 +322,7 @@ export const useSystemUpdateStore = defineStore('system-update', () => {
   return {
     version,
     updateInfo,
+    phase,
     loading,
     checking,
     updating,
diff --git a/frontend/src/views/accounts/composables/useAccountConnectionTest.ts b/frontend/src/views/accounts/composables/useAccountConnectionTest.ts
index 83c7ffda6..b898e7109 100644
--- a/frontend/src/views/accounts/composables/useAccountConnectionTest.ts
+++ b/frontend/src/views/accounts/composables/useAccountConnectionTest.ts
@@ -1,6 +1,7 @@
+import type { Account, AccountModelsResponse } from '@/api'
 import { CheckCircle2, Clock3, Wifi, XCircle } from '@lucide/vue'
-import { useEventSource } from '@vueuse/core'
 
+import { useEventSource } from '@vueuse/core'
 import { clamp } from 'es-toolkit'
 import { computed, onBeforeUnmount, ref, shallowRef, watch } from 'vue'
 import { getAccountModels, refreshAccountModels } from '@/api'
@@ -35,11 +36,23 @@ interface ConnectionTestRequestPayload {
   input?: Array<{ content?: Array<{ type?: string, text?: string }> }>
 }
 
+interface ConnectionTestEvent {
+  type: string
+  text?: string
+  model?: string
+  payload?: ConnectionTestRequestPayload
+  success?: boolean
+  accountStatus?: string
+  upstreamBody?: string
+  upstreamStatus?: number
+  error?: string
+}
+
 interface AccountConnectionTestOptions {
   onAccountStatus: (accountId: string, status: string) => void
 }
 
-function connectionTestErrorText(event: any) {
+function connectionTestErrorText(event: ConnectionTestEvent) {
   if (typeof event.upstreamBody === 'string' && event.upstreamBody.length > 0)
     return event.upstreamBody
   if (Number.isInteger(event.upstreamStatus))
@@ -49,7 +62,7 @@ function connectionTestErrorText(event: any) {
 
 export function useAccountConnectionTest(options: AccountConnectionTestOptions) {
   const showConnectionTestModal = shallowRef(false)
-  const testingAccount = shallowRef<any>(null)
+  const testingAccount = shallowRef<Account | null>(null)
   const connectionTestStatus = shallowRef<ConnectionTestStatus>('idle')
   const connectionTestModel = shallowRef('')
   const connectionTestContent = shallowRef('')
@@ -119,7 +132,7 @@ export function useAccountConnectionTest(options: AccountConnectionTestOptions)
     }
   })
 
-  function openConnectionTest(account: any) {
+  function openConnectionTest(account: Account) {
     abortConnectionTest()
     testingAccount.value = account
     connectionTestSelectedModel.value = ''
@@ -241,7 +254,7 @@ export function useAccountConnectionTest(options: AccountConnectionTestOptions)
     clearConnectionTestRun()
   }
 
-  function handleConnectionTestEvent(event: any) {
+  function handleConnectionTestEvent(event: ConnectionTestEvent) {
     if (event.type === 'test_start') {
       connectionTestModel.value = event.model || connectionTestModel.value
       appendConnectionTestLog(`开始测试 ${connectionTestModel.value || '未选择模型'}`, 'info')
@@ -312,7 +325,7 @@ export function useAccountConnectionTest(options: AccountConnectionTestOptions)
     }
   }
 
-  function applyConnectionTestModels(result: any, preserveSelection = false) {
+  function applyConnectionTestModels(result: AccountModelsResponse, preserveSelection = false) {
     const previousSelection = preserveSelection ? connectionTestSelectedModel.value : ''
     connectionTestModelOptions.value = []
     for (const model of result.models ?? []) {
diff --git a/frontend/src/views/usage/components/UsageCostCard.vue b/frontend/src/views/usage/components/UsageCostCard.vue
index 035d848a9..a531c7aea 100644
--- a/frontend/src/views/usage/components/UsageCostCard.vue
+++ b/frontend/src/views/usage/components/UsageCostCard.vue
@@ -41,7 +41,7 @@ const props = withDefaults(
 
 const activeView = shallowRef('cost')
 const { palette } = useUsageChartPalette()
-const points = computed<any[]>(() => props.cost.points)
+const points = computed(() => props.cost.points)
 const hasStandardCost = computed(() =>
   points.value.some(point => point.standardCost != null),
 )
@@ -62,7 +62,7 @@ const hasData = computed(() => {
     return points.value.some(point => point.totalTokens > 0 || point.cachedTokens > 0)
   }
   return points.value.some(
-    point => point.inputTokens > 0 || point.cachedTokenRate > 0 || point.cacheHitRequestRate > 0,
+    point => point.inputTokens > 0 || point.cachedTokenRate > 0 || (point.cacheHitRequestRate ?? 0) > 0,
   )
 })