feat(codex): 增强 OAuth 导入解析与账号信息提取，优化维护调度器线程模型

Codex OAuth:
- 导入解析支持附加账号字段（account_id/plan_type/user_id/email）
- enrich_codex 扩展从 access_token 和直接字段提取账号信息
- parse_codex_id_token 支持 JWT/JSON 字符串/dict 三种输入格式
- request patching 新增 openai:compact 格式支持
- codex_usage_parser 新增 credits_unlimited 字段解析

维护调度器:
- 同步 DB 操作迁移到线程池执行，避免阻塞事件循环
- 新增 request_candidates 定期清理任务
- 新增每周 VACUUM ANALYZE 数据库表维护任务
- 新增 enable_db_maintenance 配置项

前端:
- ElapsedTimeText 从 setInterval 改为 requestAnimationFrame
- 时间线过滤 available/unused 占位记录
- Usage 页面默认关闭全局自动刷新
- 移除号池管理中的配额更新时间显示

frontend/src/features/usage/components/ElapsedTimeText.vue

@@ -10,20 +10,18 @@ const props = withDefaults(defineProps<{
   status?: string | null
   responseTimeMs?: number | null
   precision?: number
-  intervalMs?: number
 }>(), {
   createdAt: null,
   status: null,
   responseTimeMs: null,
   precision: 2,
-  intervalMs: 200
 })
 
 const now = ref(Date.now())
 const precision = computed(() => Math.max(0, props.precision))
 const isActive = computed(() => props.status === 'pending' || props.status === 'streaming')
 
-let timer: ReturnType<typeof setInterval> | null = null
+let rafId: number | null = null
 
 function parseCreatedAtMs(value: string | null | undefined): number {
   if (!value) return Number.NaN
@@ -32,31 +30,33 @@ function parseCreatedAtMs(value: string | null | undefined): number {
   return new Date(normalized).getTime()
 }
 
-function stopTimer() {
-  if (!timer) return
-  clearInterval(timer)
-  timer = null
+function stopRaf() {
+  if (rafId == null) return
+  cancelAnimationFrame(rafId)
+  rafId = null
 }
 
-function startTimer() {
-  stopTimer()
-  const intervalMs = Math.max(100, props.intervalMs)
-  timer = setInterval(() => {
-    now.value = Date.now()
-  }, intervalMs)
+function tick() {
+  now.value = Date.now()
+  rafId = requestAnimationFrame(tick)
 }
 
-watch([isActive, () => props.intervalMs], ([active]) => {
+function startRaf() {
+  stopRaf()
+  now.value = Date.now()
+  rafId = requestAnimationFrame(tick)
+}
+
+watch(isActive, (active) => {
   if (active) {
-    now.value = Date.now()
-    startTimer()
+    startRaf()
   } else {
-    stopTimer()
+    stopRaf()
   }
 }, { immediate: true })
 
 onUnmounted(() => {
-  stopTimer()
+  stopRaf()
 })
 
 const displayText = computed(() => {

frontend/src/features/usage/components/HorizontalRequestTimeline.vue

@@ -642,6 +642,10 @@ const normalizeTimelineStatus = (value: unknown): CandidateRecord['status'] => {
   return 'failed'
 }
 
+const isPlannedOnlyStatus = (status: CandidateRecord['status']): boolean => {
+  return status === 'available' || status === 'unused'
+}
+
 // 候选时间线（按实际执行顺序排序）
 const rawTimeline = computed<CandidateRecord[]>(() => {
   if (!trace.value) return []
@@ -658,6 +662,11 @@ const rawTimeline = computed<CandidateRecord[]>(() => {
     })
 })
 
+// 仅保留“已进入执行链路”的节点，过滤预创建但未执行的 available/unused 占位记录。
+const executableTimeline = computed<CandidateRecord[]>(() => {
+  return rawTimeline.value.filter(candidate => !isPlannedOnlyStatus(candidate.status))
+})
+
 const schedulingAudit = computed<Record<string, unknown> | null>(() => {
   const metadata = props.requestMetadata
   if (!metadata || typeof metadata !== 'object' || Array.isArray(metadata)) return null
@@ -677,7 +686,7 @@ const extractPoolGroupId = (candidate: CandidateRecord): string | null => {
 
 const poolAttemptCandidates = computed<CandidateRecord[]>(() => {
   // 新链路：优先使用后端写入的 extra_data.pool_group_id。
-  const fromTrace = rawTimeline.value.filter((candidate) => extractPoolGroupId(candidate) !== null)
+  const fromTrace = executableTimeline.value.filter((candidate) => extractPoolGroupId(candidate) !== null)
   if (fromTrace.length > 0) {
     return fromTrace
   }
@@ -765,8 +774,8 @@ const poolAttemptKeySet = computed<Set<string>>(() => {
 })
 
 const timeline = computed<CandidateRecord[]>(() => {
-  if (poolAttemptCandidates.value.length === 0) return rawTimeline.value
-  return rawTimeline.value.filter(
+  if (poolAttemptCandidates.value.length === 0) return executableTimeline.value
+  return executableTimeline.value.filter(
     (candidate) => !poolAttemptKeySet.value.has(makeAttemptKey(candidate.candidate_index, candidate.retry_index)),
   )
 })

frontend/src/views/admin/PoolManagement.vue

@@ -373,12 +373,6 @@
                           />
                         </Button>
                       </template>
-                      <span
-                        v-if="formatQuotaUpdatedAt(key)"
-                        class="text-[10px] text-muted-foreground/70 whitespace-nowrap"
-                      >
-                        {{ formatQuotaUpdatedAt(key) }}
-                      </span>
                       <Badge
                         v-if="key.oauth_plan_type"
                         variant="outline"
@@ -767,12 +761,6 @@
                       />
                     </Button>
                   </template>
-                  <span
-                    v-if="formatQuotaUpdatedAt(key)"
-                    class="text-[10px] text-muted-foreground/70 truncate"
-                  >
-                    {{ formatQuotaUpdatedAt(key) }}
-                  </span>
                   <Badge
                     v-if="key.oauth_plan_type"
                     variant="outline"
@@ -2078,27 +2066,6 @@ function getOAuthStatusTitle(key: PoolKeyDetail): string {
   return `Token 剩余有效期: ${status.text}`
 }
 
-function formatUpdatedAt(updatedAtSeconds: number | null | undefined): string {
-  if (!updatedAtSeconds) return ''
-
-  // 触发响应式更新，保持“xx分钟前更新”实时变化
-  void countdownTick.value
-
-  const now = Math.floor(Date.now() / 1000)
-  const diff = now - updatedAtSeconds
-  if (diff <= 60) return '刚刚更新'
-  const minutes = Math.floor(diff / 60)
-  if (minutes < 60) return `${minutes}分钟前更新`
-  const hours = Math.floor(minutes / 60)
-  if (hours < 24) return `${hours}小时前更新`
-  const days = Math.floor(hours / 24)
-  return `${days}天前更新`
-}
-
-function formatQuotaUpdatedAt(key: PoolKeyDetail): string {
-  return formatUpdatedAt(key.quota_updated_at)
-}
-
 function normalizeQuotaLabel(label: string): string {
   const normalized = label.trim()
   if (!normalized) return '额度'

frontend/src/views/admin/system-settings/CleanupPolicySection.vue

@@ -164,7 +164,8 @@
         <p>2. <strong>压缩日志阶段</strong>: body 字段被压缩存储，节省空间</p>
         <p>3. <strong>统计阶段</strong>: 仅保留 tokens、成本等统计信息</p>
         <p>4. <strong>归档删除</strong>: 超过保留期限后完全删除记录</p>
-        <p>5. <strong>审计日志</strong>: 独立清理，记录用户登录、操作等安全事件</p>
+        <p>5. <strong>候选记录</strong>: 与详细记录同步清理请求候选记录（request_candidates）</p>
+        <p>6. <strong>审计日志</strong>: 独立清理，记录用户登录、操作等安全事件</p>
       </div>
     </div>
   </CardSection>

frontend/src/views/shared/Usage.vue

@@ -250,7 +250,7 @@ let globalAutoRefreshTimer: ReturnType<typeof setInterval> | null = null
 let refreshInFlight: Promise<void> | null = null
 const AUTO_REFRESH_INTERVAL = 1000 // 1秒刷新一次（用于活跃请求）
 const GLOBAL_AUTO_REFRESH_INTERVAL = 3000 // 3秒刷新一次（全局自动刷新）
-const globalAutoRefresh = ref(true) // 全局自动刷新开关（默认开启）
+const globalAutoRefresh = ref(false) // 全局自动刷新开关（默认关闭）
 const isPageVisible = ref(typeof document === 'undefined' ? true : !document.hidden)
 
 // 轮询活跃请求状态（轻量级，只更新状态变化的记录）