diff --git a/frontend/src/api/cache.ts b/frontend/src/api/cache.ts
index e0bf159..c8d3b59 100644
--- a/frontend/src/api/cache.ts
+++ b/frontend/src/api/cache.ts
@@ -156,3 +156,116 @@ export const {
   clearProviderCache,
   listAffinities
 } = cacheApi
+
+// ==================== 缓存亲和性分析 API ====================
+
+export interface TTLAnalysisUser {
+  group_id: string
+  username: string | null
+  email: string | null
+  request_count: number
+  interval_distribution: {
+    within_5min: number
+    within_15min: number
+    within_30min: number
+    within_60min: number
+    over_60min: number
+  }
+  interval_percentages: {
+    within_5min: number
+    within_15min: number
+    within_30min: number
+    within_60min: number
+    over_60min: number
+  }
+  percentiles: {
+    p50: number | null
+    p75: number | null
+    p90: number | null
+  }
+  avg_interval_minutes: number | null
+  min_interval_minutes: number | null
+  max_interval_minutes: number | null
+  recommended_ttl_minutes: number
+  recommendation_reason: string
+}
+
+export interface TTLAnalysisResponse {
+  analysis_period_hours: number
+  total_users_analyzed: number
+  ttl_distribution: {
+    '5min': number
+    '15min': number
+    '30min': number
+    '60min': number
+  }
+  users: TTLAnalysisUser[]
+}
+
+export interface CacheHitAnalysisResponse {
+  analysis_period_hours: number
+  total_requests: number
+  requests_with_cache_hit: number
+  request_cache_hit_rate: number
+  total_input_tokens: number
+  total_cache_read_tokens: number
+  total_cache_creation_tokens: number
+  token_cache_hit_rate: number
+  total_cache_read_cost_usd: number
+  total_cache_creation_cost_usd: number
+  estimated_savings_usd: number
+}
+
+export interface IntervalTimelinePoint {
+  x: string  // ISO 时间字符串
+  y: number  // 间隔分钟数
+  user_id?: string  // 用户 ID（仅 include_user_info=true 时存在）
+}
+
+export interface IntervalTimelineResponse {
+  analysis_period_hours: number
+  total_points: number
+  points: IntervalTimelinePoint[]
+  users?: Record<string, string>  // user_id -> username 映射（仅 include_user_info=true 时存在）
+}
+
+export const cacheAnalysisApi = {
+  /**
+   * 分析缓存亲和性 TTL 推荐
+   */
+  async analyzeTTL(params?: {
+    user_id?: string
+    api_key_id?: string
+    hours?: number
+  }): Promise<TTLAnalysisResponse> {
+    const response = await api.get('/api/admin/usage/cache-affinity/ttl-analysis', { params })
+    return response.data
+  },
+
+  /**
+   * 分析缓存命中情况
+   */
+  async analyzeHit(params?: {
+    user_id?: string
+    api_key_id?: string
+    hours?: number
+  }): Promise<CacheHitAnalysisResponse> {
+    const response = await api.get('/api/admin/usage/cache-affinity/hit-analysis', { params })
+    return response.data
+  },
+
+  /**
+   * 获取请求间隔时间线数据
+   *
+   * @param params.include_user_info 是否包含用户信息（用于管理员多用户视图）
+   */
+  async getIntervalTimeline(params?: {
+    hours?: number
+    limit?: number
+    user_id?: string
+    include_user_info?: boolean
+  }): Promise<IntervalTimelineResponse> {
+    const response = await api.get('/api/admin/usage/cache-affinity/interval-timeline', { params })
+    return response.data
+  }
+}
diff --git a/frontend/src/components/charts/ScatterChart.vue b/frontend/src/components/charts/ScatterChart.vue
new file mode 100644
index 0000000..24e43e4
--- /dev/null
+++ b/frontend/src/components/charts/ScatterChart.vue
@@ -0,0 +1,372 @@
+<template>
+  <div class="w-full h-full relative">
+    <canvas ref="chartRef"></canvas>
+    <div
+      v-if="crosshairStats"
+      class="absolute top-2 right-2 bg-gray-800/90 text-gray-100 px-3 py-2 rounded-lg text-sm shadow-lg border border-gray-600"
+    >
+      <div class="font-medium text-yellow-400">Y = {{ crosshairStats.yValue.toFixed(1) }} 分钟</div>
+      <div class="mt-1">
+        <span class="text-green-400">{{ crosshairStats.belowCount }}</span> / {{ crosshairStats.totalCount }} 点在横线以下
+        <span class="ml-2 text-blue-400">({{ crosshairStats.belowPercent.toFixed(1) }}%)</span>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+import { ref, onMounted, onUnmounted, watch, nextTick, computed } from 'vue'
+import {
+  Chart as ChartJS,
+  LinearScale,
+  PointElement,
+  ScatterController,
+  TimeScale,
+  Title,
+  Tooltip,
+  Legend,
+  type ChartData,
+  type ChartOptions,
+  type Plugin,
+  type Scale
+} from 'chart.js'
+import 'chartjs-adapter-date-fns'
+
+ChartJS.register(
+  LinearScale,
+  PointElement,
+  ScatterController,
+  TimeScale,
+  Title,
+  Tooltip,
+  Legend
+)
+
+interface Props {
+  data: ChartData<'scatter'>
+  options?: ChartOptions<'scatter'>
+  height?: number
+}
+
+interface CrosshairStats {
+  yValue: number
+  belowCount: number
+  totalCount: number
+  belowPercent: number
+}
+
+const props = withDefaults(defineProps<Props>(), {
+  height: 300
+})
+
+const chartRef = ref<HTMLCanvasElement>()
+let chart: ChartJS<'scatter'> | null = null
+
+const crosshairY = ref<number | null>(null)
+
+const crosshairStats = computed<CrosshairStats | null>(() => {
+  if (crosshairY.value === null || !props.data.datasets) return null
+
+  let totalCount = 0
+  let belowCount = 0
+
+  for (const dataset of props.data.datasets) {
+    if (!dataset.data) continue
+    for (const point of dataset.data) {
+      const p = point as { x: string; y: number }
+      if (typeof p.y === 'number') {
+        totalCount++
+        if (p.y <= crosshairY.value) {
+          belowCount++
+        }
+      }
+    }
+  }
+
+  if (totalCount === 0) return null
+
+  return {
+    yValue: crosshairY.value,
+    belowCount,
+    totalCount,
+    belowPercent: (belowCount / totalCount) * 100
+  }
+})
+
+const crosshairPlugin: Plugin<'scatter'> = {
+  id: 'crosshairLine',
+  afterDraw: (chartInstance) => {
+    if (crosshairY.value === null) return
+
+    const { ctx, chartArea, scales } = chartInstance
+    const yScale = scales.y
+    if (!yScale || !chartArea) return
+
+    const yPixel = yScale.getPixelForValue(crosshairY.value)
+
+    if (yPixel < chartArea.top || yPixel > chartArea.bottom) return
+
+    ctx.save()
+    ctx.beginPath()
+    ctx.moveTo(chartArea.left, yPixel)
+    ctx.lineTo(chartArea.right, yPixel)
+    ctx.strokeStyle = 'rgba(250, 204, 21, 0.8)'
+    ctx.lineWidth = 2
+    ctx.setLineDash([6, 4])
+    ctx.stroke()
+    ctx.restore()
+  }
+}
+
+// 自定义非线性 Y 轴转换函数
+// 0-10 分钟占据 70% 的空间，10-120 分钟占据 30% 的空间
+const BREAKPOINT = 10  // 分界点：10 分钟
+const LOWER_RATIO = 0.7  // 0-10 分钟占 70% 空间
+
+// 将实际值转换为显示值（用于绘图）
+function toDisplayValue(realValue: number): number {
+  if (realValue <= BREAKPOINT) {
+    // 0-10 分钟线性映射到 0-70
+    return realValue * (LOWER_RATIO * 100 / BREAKPOINT)
+  } else {
+    // 10-120 分钟映射到 70-100
+    const upperRange = 120 - BREAKPOINT
+    const displayUpperRange = (1 - LOWER_RATIO) * 100
+    return LOWER_RATIO * 100 + ((realValue - BREAKPOINT) / upperRange) * displayUpperRange
+  }
+}
+
+// 将显示值转换回实际值（用于读取鼠标位置）
+function toRealValue(displayValue: number): number {
+  const breakpointDisplay = LOWER_RATIO * 100
+  if (displayValue <= breakpointDisplay) {
+    return displayValue / (LOWER_RATIO * 100 / BREAKPOINT)
+  } else {
+    const upperRange = 120 - BREAKPOINT
+    const displayUpperRange = (1 - LOWER_RATIO) * 100
+    return BREAKPOINT + ((displayValue - breakpointDisplay) / displayUpperRange) * upperRange
+  }
+}
+
+// 转换数据点的 Y 值
+function transformData(data: ChartData<'scatter'>): ChartData<'scatter'> {
+  return {
+    ...data,
+    datasets: data.datasets.map(dataset => ({
+      ...dataset,
+      data: (dataset.data as Array<{ x: string; y: number }>).map(point => ({
+        ...point,
+        y: toDisplayValue(point.y),
+        _originalY: point.y  // 保存原始值用于 tooltip
+      }))
+    }))
+  }
+}
+
+const defaultOptions: ChartOptions<'scatter'> = {
+  responsive: true,
+  maintainAspectRatio: false,
+  interaction: {
+    mode: 'nearest',
+    intersect: true
+  },
+  scales: {
+    x: {
+      type: 'time',
+      time: {
+        unit: 'hour',
+        displayFormats: {
+          hour: 'MM-dd HH:mm'
+        }
+      },
+      grid: {
+        color: 'rgba(156, 163, 175, 0.1)'
+      },
+      ticks: {
+        color: 'rgb(107, 114, 128)',
+        maxRotation: 45
+      },
+      title: {
+        display: true,
+        text: '时间',
+        color: 'rgb(107, 114, 128)'
+      }
+    },
+    y: {
+      type: 'linear',
+      min: 0,
+      max: 100,  // 显示值范围 0-100
+      grid: {
+        color: 'rgba(156, 163, 175, 0.1)'
+      },
+      ticks: {
+        color: 'rgb(107, 114, 128)',
+        // 自定义刻度值：在实际值 0, 2, 5, 10, 30, 60, 120 处显示
+        callback: function(this: Scale, tickValue: string | number) {
+          const displayVal = Number(tickValue)
+          const realVal = toRealValue(displayVal)
+          // 只在特定的显示位置显示刻度
+          const targetTicks = [0, 2, 5, 10, 30, 60, 120]
+          for (const target of targetTicks) {
+            const targetDisplay = toDisplayValue(target)
+            if (Math.abs(displayVal - targetDisplay) < 1) {
+              return `${target}`
+            }
+          }
+          return ''
+        },
+        stepSize: 5,  // 显示值的步长
+        autoSkip: false
+      },
+      title: {
+        display: true,
+        text: '间隔 (分钟)',
+        color: 'rgb(107, 114, 128)'
+      },
+      afterBuildTicks: function(scale: Scale) {
+        // 在特定实际值处设置刻度
+        const targetTicks = [0, 2, 5, 10, 30, 60, 120]
+        scale.ticks = targetTicks.map(val => ({
+          value: toDisplayValue(val),
+          label: `${val}`
+        }))
+      }
+    }
+  },
+  plugins: {
+    legend: {
+      display: false
+    },
+    tooltip: {
+      backgroundColor: 'rgb(31, 41, 55)',
+      titleColor: 'rgb(243, 244, 246)',
+      bodyColor: 'rgb(243, 244, 246)',
+      borderColor: 'rgb(75, 85, 99)',
+      borderWidth: 1,
+      callbacks: {
+        label: (context) => {
+          const point = context.raw as { x: string; y: number; _originalY?: number }
+          const realY = point._originalY ?? toRealValue(point.y)
+          return `间隔: ${realY.toFixed(1)} 分钟`
+        }
+      }
+    }
+  },
+  onHover: (event, _elements, chartInstance) => {
+    const canvas = chartInstance.canvas
+    if (!canvas) return
+
+    const rect = canvas.getBoundingClientRect()
+    const mouseY = (event.native as MouseEvent)?.clientY
+
+    if (mouseY === undefined) {
+      crosshairY.value = null
+      return
+    }
+
+    const { chartArea, scales } = chartInstance
+    const yScale = scales.y
+
+    if (!chartArea || !yScale) return
+
+    const relativeY = mouseY - rect.top
+
+    if (relativeY < chartArea.top || relativeY > chartArea.bottom) {
+      crosshairY.value = null
+    } else {
+      const displayValue = yScale.getValueForPixel(relativeY)
+      // 转换回实际值
+      crosshairY.value = displayValue !== undefined ? toRealValue(displayValue) : null
+    }
+
+    chartInstance.draw()
+  }
+}
+
+// 修改 crosshairPlugin 使用显示值
+const crosshairPluginWithTransform: Plugin<'scatter'> = {
+  id: 'crosshairLine',
+  afterDraw: (chartInstance) => {
+    if (crosshairY.value === null) return
+
+    const { ctx, chartArea, scales } = chartInstance
+    const yScale = scales.y
+    if (!yScale || !chartArea) return
+
+    // 将实际值转换为显示值再获取像素位置
+    const displayValue = toDisplayValue(crosshairY.value)
+    const yPixel = yScale.getPixelForValue(displayValue)
+
+    if (yPixel < chartArea.top || yPixel > chartArea.bottom) return
+
+    ctx.save()
+    ctx.beginPath()
+    ctx.moveTo(chartArea.left, yPixel)
+    ctx.lineTo(chartArea.right, yPixel)
+    ctx.strokeStyle = 'rgba(250, 204, 21, 0.8)'
+    ctx.lineWidth = 2
+    ctx.setLineDash([6, 4])
+    ctx.stroke()
+    ctx.restore()
+  }
+}
+
+function handleMouseLeave() {
+  crosshairY.value = null
+  if (chart) {
+    chart.draw()
+  }
+}
+
+function createChart() {
+  if (!chartRef.value) return
+
+  // 转换数据
+  const transformedData = transformData(props.data)
+
+  chart = new ChartJS(chartRef.value, {
+    type: 'scatter',
+    data: transformedData,
+    options: {
+      ...defaultOptions,
+      ...props.options
+    },
+    plugins: [crosshairPluginWithTransform]
+  })
+
+  chartRef.value.addEventListener('mouseleave', handleMouseLeave)
+}
+
+function updateChart() {
+  if (chart) {
+    chart.data = transformData(props.data)
+    chart.update('none')
+  }
+}
+
+onMounted(async () => {
+  await nextTick()
+  createChart()
+})
+
+onUnmounted(() => {
+  if (chartRef.value) {
+    chartRef.value.removeEventListener('mouseleave', handleMouseLeave)
+  }
+  if (chart) {
+    chart.destroy()
+    chart = null
+  }
+})
+
+watch(() => props.data, updateChart, { deep: true })
+watch(() => props.options, () => {
+  if (chart) {
+    chart.options = {
+      ...defaultOptions,
+      ...props.options
+    }
+    chart.update()
+  }
+}, { deep: true })
+</script>
diff --git a/frontend/src/views/admin/CacheMonitoring.vue b/frontend/src/views/admin/CacheMonitoring.vue
index 3d9714e..bc0d9aa 100644
--- a/frontend/src/views/admin/CacheMonitoring.vue
+++ b/frontend/src/views/admin/CacheMonitoring.vue
@@ -12,10 +12,27 @@ import TableRow from '@/components/ui/table-row.vue'
 import Input from '@/components/ui/input.vue'
 import Pagination from '@/components/ui/pagination.vue'
 import RefreshButton from '@/components/ui/refresh-button.vue'
-import { Trash2, Eraser, Search, X } from 'lucide-vue-next'
+import Select from '@/components/ui/select.vue'
+import SelectTrigger from '@/components/ui/select-trigger.vue'
+import SelectContent from '@/components/ui/select-content.vue'
+import SelectItem from '@/components/ui/select-item.vue'
+import SelectValue from '@/components/ui/select-value.vue'
+import ScatterChart from '@/components/charts/ScatterChart.vue'
+import { Trash2, Eraser, Search, X, BarChart3, ChevronDown, ChevronRight } from 'lucide-vue-next'
 import { useToast } from '@/composables/useToast'
 import { useConfirm } from '@/composables/useConfirm'
 import { cacheApi, type CacheStats, type CacheConfig, type UserAffinity } from '@/api/cache'
+import type { TTLAnalysisUser } from '@/api/cache'
+import { formatNumber, formatTokens, formatCost, formatRemainingTime } from '@/utils/format'
+import {
+  useTTLAnalysis,
+  ANALYSIS_HOURS_OPTIONS,
+  getTTLBadgeVariant,
+  getFrequencyLabel,
+  getFrequencyClass
+} from '@/composables/useTTLAnalysis'
+
+// ==================== 缓存统计与亲和性列表 ====================
 
 const stats = ref<CacheStats | null>(null)
 const config = ref<CacheConfig | null>(null)
@@ -27,28 +44,40 @@ const matchedUserId = ref<string | null>(null)
 const clearingRowAffinityKey = ref<string | null>(null)
 const currentPage = ref(1)
 const pageSize = ref(20)
+const currentTime = ref(Math.floor(Date.now() / 1000))
+
 const { success: showSuccess, error: showError, info: showInfo } = useToast()
 const { confirm: showConfirm } = useConfirm()
-const currentTime = ref(Math.floor(Date.now() / 1000))
 
 let searchDebounceTimer: ReturnType<typeof setTimeout> | null = null
 let skipNextKeywordWatch = false
 let countdownTimer: ReturnType<typeof setInterval> | null = null
 
-// 计算分页后的数据
+// ==================== TTL 分析 (使用 composable) ====================
+
+const {
+  ttlAnalysis,
+  hitAnalysis,
+  ttlAnalysisLoading,
+  analysisHours,
+  expandedUserId,
+  userTimelineData,
+  userTimelineLoading,
+  userTimelineChartData,
+  toggleUserExpand,
+  refreshAnalysis
+} = useTTLAnalysis()
+
+// ==================== 计算属性 ====================
+
 const paginatedAffinityList = computed(() => {
   const start = (currentPage.value - 1) * pageSize.value
   const end = start + pageSize.value
   return affinityList.value.slice(start, end)
 })
 
-// 页码变化处理
-function handlePageChange() {
-  // 分页变化时滚动到顶部
-  window.scrollTo({ top: 0, behavior: 'smooth' })
-}
+// ==================== 缓存统计方法 ====================
 
-// 获取缓存统计
 async function fetchCacheStats() {
   loading.value = true
   try {
@@ -61,7 +90,6 @@ async function fetchCacheStats() {
   }
 }
 
-// 获取缓存配置
 async function fetchCacheConfig() {
   try {
     config.value = await cacheApi.getConfig()
@@ -70,7 +98,6 @@ async function fetchCacheConfig() {
   }
 }
 
-// 获取缓存亲和性列表
 async function fetchAffinityList(keyword?: string) {
   listLoading.value = true
   try {
@@ -107,17 +134,14 @@ async function resetAffinitySearch() {
   await fetchAffinityList()
 }
 
-// 清除缓存（按 affinity_key 或用户标识符）
 async function clearUserCache(identifier: string, displayName?: string) {
   const target = identifier?.trim()
-
   if (!target) {
     showError('无法识别标识符')
     return
   }
 
   const label = displayName || target
-
   const confirmed = await showConfirm({
     title: '确认清除',
     message: `确定要清除 ${label} 的缓存吗？`,
@@ -125,12 +149,9 @@ async function clearUserCache(identifier: string, displayName?: string) {
     variant: 'destructive'
   })
 
-  if (!confirmed) {
-    return
-  }
+  if (!confirmed) return
 
   clearingRowAffinityKey.value = target
-
   try {
     await cacheApi.clearUserCache(target)
     showSuccess('清除成功')
@@ -144,7 +165,6 @@ async function clearUserCache(identifier: string, displayName?: string) {
   }
 }
 
-// 清除所有缓存
 async function clearAllCache() {
   const firstConfirm = await showConfirm({
     title: '危险操作',
@@ -152,10 +172,7 @@ async function clearAllCache() {
     confirmText: '继续',
     variant: 'destructive'
   })
-
-  if (!firstConfirm) {
-    return
-  }
+  if (!firstConfirm) return
 
   const secondConfirm = await showConfirm({
     title: '再次确认',
@@ -163,10 +180,7 @@ async function clearAllCache() {
     confirmText: '确认清除',
     variant: 'destructive'
   })
-
-  if (!secondConfirm) {
-    return
-  }
+  if (!secondConfirm) return
 
   try {
     await cacheApi.clearAllCache()
@@ -179,33 +193,39 @@ async function clearAllCache() {
   }
 }
 
-// 计算剩余时间（使用实时更新的 currentTime）
-function getRemainingTime(expireAt?: number) {
-  if (!expireAt) return '未知'
-  const remaining = expireAt - currentTime.value
-  if (remaining <= 0) return '已过期'
+// ==================== 工具方法 ====================
 
-  const minutes = Math.floor(remaining / 60)
-  const seconds = Math.floor(remaining % 60)
-  return `${minutes}分${seconds}秒`
+function getRemainingTime(expireAt?: number): string {
+  return formatRemainingTime(expireAt, currentTime.value)
 }
 
-// 启动倒计时定时器
-function startCountdown() {
-  if (countdownTimer) {
-    clearInterval(countdownTimer)
+function formatIntervalDescription(user: TTLAnalysisUser): string {
+  const p90 = user.percentiles.p90
+  if (p90 === null || p90 === undefined) return '-'
+  if (p90 < 1) {
+    const seconds = Math.round(p90 * 60)
+    return `90% 请求间隔 < ${seconds} 秒`
   }
+  return `90% 请求间隔 < ${p90.toFixed(1)} 分钟`
+}
+
+function handlePageChange() {
+  window.scrollTo({ top: 0, behavior: 'smooth' })
+}
+
+// ==================== 定时器管理 ====================
+
+function startCountdown() {
+  if (countdownTimer) clearInterval(countdownTimer)
 
   countdownTimer = setInterval(() => {
     currentTime.value = Math.floor(Date.now() / 1000)
 
-    // 过滤掉已过期的项目
     const beforeCount = affinityList.value.length
-    affinityList.value = affinityList.value.filter(item => {
-      return item.expire_at && item.expire_at > currentTime.value
-    })
+    affinityList.value = affinityList.value.filter(
+      item => item.expire_at && item.expire_at > currentTime.value
+    )
 
-    // 如果有项目被移除，显示提示
     if (beforeCount > affinityList.value.length) {
       const removedCount = beforeCount - affinityList.value.length
       showInfo(`${removedCount} 个缓存已自动过期移除`)
@@ -213,7 +233,6 @@ function startCountdown() {
   }, 1000)
 }
 
-// 停止倒计时定时器
 function stopCountdown() {
   if (countdownTimer) {
     clearInterval(countdownTimer)
@@ -221,15 +240,25 @@ function stopCountdown() {
   }
 }
 
+// ==================== 刷新所有数据 ====================
+
+async function refreshData() {
+  await Promise.all([
+    fetchCacheStats(),
+    fetchCacheConfig(),
+    fetchAffinityList()
+  ])
+}
+
+// ==================== 生命周期 ====================
+
 watch(tableKeyword, (value) => {
   if (skipNextKeywordWatch) {
     skipNextKeywordWatch = false
     return
   }
 
-  if (searchDebounceTimer) {
-    clearTimeout(searchDebounceTimer)
-  }
+  if (searchDebounceTimer) clearTimeout(searchDebounceTimer)
 
   const keyword = value.trim()
   searchDebounceTimer = setTimeout(() => {
@@ -243,21 +272,11 @@ onMounted(() => {
   fetchCacheConfig()
   fetchAffinityList()
   startCountdown()
+  refreshAnalysis()
 })
 
-// 刷新所有数据
-async function refreshData() {
-  await Promise.all([
-    fetchCacheStats(),
-    fetchCacheConfig(),
-    fetchAffinityList()
-  ])
-}
-
 onBeforeUnmount(() => {
-  if (searchDebounceTimer) {
-    clearTimeout(searchDebounceTimer)
-  }
+  if (searchDebounceTimer) clearTimeout(searchDebounceTimer)
   stopCountdown()
 })
 </script>
@@ -272,31 +291,18 @@ onBeforeUnmount(() => {
       </p>
     </div>
 
-    <!-- 核心指标 -->
+    <!-- 亲和性系统状态 -->
     <div class="grid grid-cols-2 md:grid-cols-4 gap-4">
-      <!-- 缓存命中率 -->
       <Card class="p-4">
-        <div class="text-xs text-muted-foreground">命中率</div>
-        <div class="text-2xl font-bold text-success mt-1">
-          {{ stats ? (stats.affinity_stats.cache_hit_rate * 100).toFixed(1) : '0.0' }}%
-        </div>
-        <div class="text-xs text-muted-foreground mt-1">
-          {{ stats?.affinity_stats?.cache_hits || 0 }} / {{ (stats?.affinity_stats?.cache_hits || 0) + (stats?.affinity_stats?.cache_misses || 0) }}
-        </div>
-      </Card>
-
-      <!-- 活跃缓存数 -->
-      <Card class="p-4">
-        <div class="text-xs text-muted-foreground">活跃缓存</div>
+        <div class="text-xs text-muted-foreground">活跃亲和性</div>
         <div class="text-2xl font-bold mt-1">
-          {{ stats?.affinity_stats?.total_affinities || 0 }}
+          {{ stats?.affinity_stats?.active_affinities || 0 }}
         </div>
         <div class="text-xs text-muted-foreground mt-1">
           TTL {{ config?.cache_ttl_seconds || 300 }}s
         </div>
       </Card>
 
-      <!-- Provider切换 -->
       <Card class="p-4">
         <div class="text-xs text-muted-foreground">Provider 切换</div>
         <div class="text-2xl font-bold mt-1" :class="(stats?.affinity_stats?.provider_switches || 0) > 0 ? 'text-destructive' : ''">
@@ -307,7 +313,16 @@ onBeforeUnmount(() => {
         </div>
       </Card>
 
-      <!-- 预留比例 -->
+      <Card class="p-4">
+        <div class="text-xs text-muted-foreground">缓存失效</div>
+        <div class="text-2xl font-bold mt-1" :class="(stats?.affinity_stats?.cache_invalidations || 0) > 0 ? 'text-warning' : ''">
+          {{ stats?.affinity_stats?.cache_invalidations || 0 }}
+        </div>
+        <div class="text-xs text-muted-foreground mt-1">
+          因 Provider 不可用
+        </div>
+      </Card>
+
       <Card class="p-4">
         <div class="text-xs text-muted-foreground flex items-center gap-1">
           预留比例
@@ -322,14 +337,13 @@ onBeforeUnmount(() => {
           </template>
         </div>
         <div class="text-xs text-muted-foreground mt-1">
-          失效 {{ stats?.affinity_stats?.cache_invalidations || 0 }}
+          当前 {{ stats ? (stats.cache_reservation_ratio * 100).toFixed(0) : '-' }}%
         </div>
       </Card>
     </div>
 
     <!-- 缓存亲和性列表 -->
     <Card class="overflow-hidden">
-      <!-- 标题和操作栏 -->
       <div class="px-6 py-3 border-b border-border/60">
         <div class="flex items-center justify-between gap-4">
           <div class="flex items-center gap-3">
@@ -365,8 +379,8 @@ onBeforeUnmount(() => {
       <Table>
         <TableHeader>
           <TableRow>
-            <TableHead class="w-28">用户</TableHead>
-            <TableHead class="w-36">Key</TableHead>
+            <TableHead class="w-36">用户</TableHead>
+            <TableHead class="w-28">Key</TableHead>
             <TableHead class="w-28">Provider</TableHead>
             <TableHead class="w-40">模型</TableHead>
             <TableHead class="w-36">API 格式 / Key</TableHead>
@@ -380,12 +394,12 @@ onBeforeUnmount(() => {
             <TableCell>
               <div class="flex items-center gap-1.5">
                 <Badge v-if="item.is_standalone" variant="outline" class="text-warning border-warning/30 text-[10px] px-1">独立</Badge>
-                <span class="text-sm font-medium truncate max-w-[90px]" :title="item.username ?? undefined">{{ item.username || '未知' }}</span>
+                <span class="text-sm font-medium truncate max-w-[120px]" :title="item.username ?? undefined">{{ item.username || '未知' }}</span>
               </div>
             </TableCell>
             <TableCell>
               <div class="flex items-center gap-1.5">
-                <span class="text-sm truncate max-w-[100px]" :title="item.user_api_key_name || undefined">{{ item.user_api_key_name || '未命名' }}</span>
+                <span class="text-sm truncate max-w-[80px]" :title="item.user_api_key_name || undefined">{{ item.user_api_key_name || '未命名' }}</span>
                 <Badge v-if="item.rate_multiplier !== 1.0" variant="outline" class="text-warning border-warning/30 text-[10px] px-2">{{ item.rate_multiplier }}x</Badge>
               </div>
               <div class="text-xs text-muted-foreground font-mono">{{ item.user_api_key_prefix || '---' }}</div>
@@ -439,5 +453,157 @@ onBeforeUnmount(() => {
         @update:page-size="pageSize = $event"
       />
     </Card>
+
+    <!-- TTL 分析区域 -->
+    <Card class="overflow-hidden">
+      <div class="px-6 py-3 border-b border-border/60">
+        <div class="flex items-center justify-between gap-4">
+          <div class="flex items-center gap-3">
+            <BarChart3 class="h-5 w-5 text-muted-foreground" />
+            <h3 class="text-base font-semibold">TTL 分析</h3>
+            <span class="text-xs text-muted-foreground">分析用户请求间隔，推荐合适的缓存 TTL</span>
+          </div>
+          <div class="flex items-center gap-2">
+            <Select v-model="analysisHours">
+              <SelectTrigger class="w-28 h-8">
+                <SelectValue placeholder="时间段" />
+              </SelectTrigger>
+              <SelectContent>
+                <SelectItem
+                  v-for="option in ANALYSIS_HOURS_OPTIONS"
+                  :key="option.value"
+                  :value="option.value"
+                >
+                  {{ option.label }}
+                </SelectItem>
+              </SelectContent>
+            </Select>
+          </div>
+        </div>
+      </div>
+
+      <!-- 缓存命中概览 -->
+      <div v-if="hitAnalysis" class="px-6 py-4 border-b border-border/40 bg-muted/30">
+        <div class="grid grid-cols-2 md:grid-cols-5 gap-6">
+          <div>
+            <div class="text-xs text-muted-foreground">请求命中率</div>
+            <div class="text-2xl font-bold text-success">{{ hitAnalysis.request_cache_hit_rate }}%</div>
+            <div class="text-xs text-muted-foreground">{{ formatNumber(hitAnalysis.requests_with_cache_hit) }} / {{ formatNumber(hitAnalysis.total_requests) }} 请求</div>
+          </div>
+          <div>
+            <div class="text-xs text-muted-foreground">Token 命中率</div>
+            <div class="text-2xl font-bold">{{ hitAnalysis.token_cache_hit_rate }}%</div>
+            <div class="text-xs text-muted-foreground">{{ formatTokens(hitAnalysis.total_cache_read_tokens) }} tokens 命中</div>
+          </div>
+          <div>
+            <div class="text-xs text-muted-foreground">缓存创建费用</div>
+            <div class="text-2xl font-bold">{{ formatCost(hitAnalysis.total_cache_creation_cost_usd) }}</div>
+            <div class="text-xs text-muted-foreground">{{ formatTokens(hitAnalysis.total_cache_creation_tokens) }} tokens</div>
+          </div>
+          <div>
+            <div class="text-xs text-muted-foreground">缓存读取费用</div>
+            <div class="text-2xl font-bold">{{ formatCost(hitAnalysis.total_cache_read_cost_usd) }}</div>
+            <div class="text-xs text-muted-foreground">{{ formatTokens(hitAnalysis.total_cache_read_tokens) }} tokens</div>
+          </div>
+          <div>
+            <div class="text-xs text-muted-foreground">预估节省</div>
+            <div class="text-2xl font-bold text-success">{{ formatCost(hitAnalysis.estimated_savings_usd) }}</div>
+          </div>
+        </div>
+      </div>
+
+      <!-- 用户 TTL 分析表格 -->
+      <Table v-if="ttlAnalysis && ttlAnalysis.users.length > 0">
+        <TableHeader>
+          <TableRow>
+            <TableHead class="w-10"></TableHead>
+            <TableHead class="w-[20%]">用户</TableHead>
+            <TableHead class="w-[15%] text-center">请求数</TableHead>
+            <TableHead class="w-[15%] text-center">使用频率</TableHead>
+            <TableHead class="w-[15%] text-center">推荐 TTL</TableHead>
+            <TableHead>说明</TableHead>
+          </TableRow>
+        </TableHeader>
+        <TableBody>
+          <template v-for="user in ttlAnalysis.users" :key="user.group_id">
+            <TableRow
+              class="cursor-pointer hover:bg-muted/50"
+              @click="toggleUserExpand(user.group_id)"
+            >
+              <TableCell class="p-2">
+                <button class="p-1 hover:bg-muted rounded">
+                  <ChevronDown v-if="expandedUserId === user.group_id" class="h-4 w-4 text-muted-foreground" />
+                  <ChevronRight v-else class="h-4 w-4 text-muted-foreground" />
+                </button>
+              </TableCell>
+              <TableCell>
+                <span class="text-sm font-medium">{{ user.username || '未知用户' }}</span>
+              </TableCell>
+              <TableCell class="text-center">
+                <span class="text-sm font-medium">{{ user.request_count }}</span>
+              </TableCell>
+              <TableCell class="text-center">
+                <span class="text-sm" :class="getFrequencyClass(user.recommended_ttl_minutes)">
+                  {{ getFrequencyLabel(user.recommended_ttl_minutes) }}
+                </span>
+              </TableCell>
+              <TableCell class="text-center">
+                <Badge :variant="getTTLBadgeVariant(user.recommended_ttl_minutes)">
+                  {{ user.recommended_ttl_minutes }} 分钟
+                </Badge>
+              </TableCell>
+              <TableCell>
+                <span class="text-xs text-muted-foreground">
+                  {{ formatIntervalDescription(user) }}
+                </span>
+              </TableCell>
+            </TableRow>
+            <!-- 展开行：显示用户散点图 -->
+            <TableRow v-if="expandedUserId === user.group_id" class="bg-muted/30">
+              <TableCell colspan="6" class="p-0">
+                <div class="px-6 py-4">
+                  <div class="flex items-center justify-between mb-3">
+                    <h4 class="text-sm font-medium">请求间隔时间线</h4>
+                    <div class="flex items-center gap-3 text-xs text-muted-foreground">
+                      <span class="flex items-center gap-1"><span class="w-2 h-2 rounded-full bg-green-500"></span> 0-5分钟</span>
+                      <span class="flex items-center gap-1"><span class="w-2 h-2 rounded-full bg-blue-500"></span> 5-15分钟</span>
+                      <span class="flex items-center gap-1"><span class="w-2 h-2 rounded-full bg-purple-500"></span> 15-30分钟</span>
+                      <span class="flex items-center gap-1"><span class="w-2 h-2 rounded-full bg-orange-500"></span> 30-60分钟</span>
+                      <span class="flex items-center gap-1"><span class="w-2 h-2 rounded-full bg-red-500"></span> >60分钟</span>
+                      <span v-if="userTimelineData" class="ml-2">共 {{ userTimelineData.total_points }} 个数据点</span>
+                    </div>
+                  </div>
+                  <div v-if="userTimelineLoading" class="h-64 flex items-center justify-center">
+                    <span class="text-sm text-muted-foreground">加载中...</span>
+                  </div>
+                  <div v-else-if="userTimelineData && userTimelineData.points.length > 0" class="h-64">
+                    <ScatterChart :data="userTimelineChartData" />
+                  </div>
+                  <div v-else class="h-64 flex items-center justify-center">
+                    <span class="text-sm text-muted-foreground">暂无数据</span>
+                  </div>
+                </div>
+              </TableCell>
+            </TableRow>
+          </template>
+        </TableBody>
+      </Table>
+
+      <!-- 分析完成但无数据 -->
+      <div v-else-if="ttlAnalysis && ttlAnalysis.users.length === 0" class="px-6 py-12 text-center">
+        <BarChart3 class="h-12 w-12 text-muted-foreground/50 mx-auto mb-3" />
+        <p class="text-sm text-muted-foreground">
+          未找到符合条件的用户数据
+        </p>
+        <p class="text-xs text-muted-foreground mt-1">
+          尝试增加分析天数或降低最小请求数阈值
+        </p>
+      </div>
+
+      <!-- 加载中 -->
+      <div v-else-if="ttlAnalysisLoading" class="px-6 py-12 text-center">
+        <p class="text-sm text-muted-foreground">正在分析用户请求数据...</p>
+      </div>
+    </Card>
   </div>
 </template>