feat(frontend): display upstream model in usage table and distribution charts

Show upstream model mapping (requested -> upstream) in UsageTable with arrow notation. Add requested/upstream/mapping source toggle to ModelDistributionChart with lazy loading — only fetches data when user switches tab, with per-source cache invalidation on filter changes. Include upstream_model column in Excel export and i18n for en/zh.

frontend/src/api/admin/dashboard.ts

@@ -81,6 +81,7 @@ export interface ModelStatsParams {
   user_id?: number
   api_key_id?: number
   model?: string
+  model_source?: 'requested' | 'upstream' | 'mapping'
   account_id?: number
   group_id?: number
   request_type?: UsageRequestType
@@ -162,6 +163,7 @@ export interface UserBreakdownParams {
   end_date?: string
   group_id?: number
   model?: string
+  model_source?: 'requested' | 'upstream' | 'mapping'
   endpoint?: string
   endpoint_type?: 'inbound' | 'upstream' | 'path'
   limit?: number

frontend/src/components/admin/usage/UsageTable.vue

@@ -25,8 +25,16 @@
           <span class="text-sm text-gray-900 dark:text-white">{{ row.account?.name || '-' }}</span>
         </template>
 
-        <template #cell-model="{ value }">
-          <span class="font-medium text-gray-900 dark:text-white">{{ value }}</span>
+        <template #cell-model="{ row }">
+          <div v-if="row.upstream_model && row.upstream_model !== row.model" class="space-y-0.5 text-xs">
+            <div class="break-all font-medium text-gray-900 dark:text-white">
+              {{ row.model }}
+            </div>
+            <div class="break-all text-gray-500 dark:text-gray-400">
+              <span class="mr-0.5">↳</span>{{ row.upstream_model }}
+            </div>
+          </div>
+          <span v-else class="font-medium text-gray-900 dark:text-white">{{ row.model }}</span>
         </template>
 
         <template #cell-reasoning_effort="{ row }">

frontend/src/components/charts/EndpointDistributionChart.vue

 <template>
   <div class="card p-4">
-    <div class="mb-4 flex items-start justify-between gap-3">
+    <div class="mb-4 flex items-center justify-between gap-3">
       <h3 class="text-sm font-semibold text-gray-900 dark:text-white">
         {{ title || t('usage.endpointDistribution') }}
       </h3>
-      <div class="flex flex-col items-end gap-2">
+      <div class="flex flex-wrap items-center justify-end gap-2">
         <div
           v-if="showSourceToggle"
           class="inline-flex rounded-lg border border-gray-200 bg-gray-50 p-0.5 dark:border-gray-700 dark:bg-dark-800"

frontend/src/components/charts/ModelDistributionChart.vue

@@ -6,7 +6,42 @@
           ? t('admin.dashboard.modelDistribution')
           : t('admin.dashboard.spendingRankingTitle') }}
       </h3>
-      <div class="flex items-center gap-2">
+      <div class="flex flex-wrap items-center justify-end gap-2">
+        <div
+          v-if="showSourceToggle"
+          class="inline-flex rounded-lg border border-gray-200 bg-gray-50 p-0.5 dark:border-gray-700 dark:bg-dark-800"
+        >
+          <button
+            type="button"
+            class="rounded-md px-2.5 py-1 text-xs font-medium transition-colors"
+            :class="source === 'requested'
+              ? 'bg-white text-gray-900 shadow-sm dark:bg-dark-700 dark:text-white'
+              : 'text-gray-500 hover:text-gray-700 dark:text-gray-400 dark:hover:text-gray-200'"
+            @click="emit('update:source', 'requested')"
+          >
+            {{ t('usage.requestedModel') }}
+          </button>
+          <button
+            type="button"
+            class="rounded-md px-2.5 py-1 text-xs font-medium transition-colors"
+            :class="source === 'upstream'
+              ? 'bg-white text-gray-900 shadow-sm dark:bg-dark-700 dark:text-white'
+              : 'text-gray-500 hover:text-gray-700 dark:text-gray-400 dark:hover:text-gray-200'"
+            @click="emit('update:source', 'upstream')"
+          >
+            {{ t('usage.upstreamModel') }}
+          </button>
+          <button
+            type="button"
+            class="rounded-md px-2.5 py-1 text-xs font-medium transition-colors"
+            :class="source === 'mapping'
+              ? 'bg-white text-gray-900 shadow-sm dark:bg-dark-700 dark:text-white'
+              : 'text-gray-500 hover:text-gray-700 dark:text-gray-400 dark:hover:text-gray-200'"
+            @click="emit('update:source', 'mapping')"
+          >
+            {{ t('usage.mapping') }}
+          </button>
+        </div>
         <div
           v-if="showMetricToggle"
           class="inline-flex rounded-lg border border-gray-200 bg-gray-50 p-0.5 dark:border-gray-700 dark:bg-dark-800"
@@ -215,9 +250,13 @@ ChartJS.register(ArcElement, Tooltip, Legend)
 const { t } = useI18n()
 
 type DistributionMetric = 'tokens' | 'actual_cost'
+type ModelSource = 'requested' | 'upstream' | 'mapping'
 type RankingDisplayItem = UserSpendingRankingItem & { isOther?: boolean }
 const props = withDefaults(defineProps<{
   modelStats: ModelStat[]
+  upstreamModelStats?: ModelStat[]
+  mappingModelStats?: ModelStat[]
+  source?: ModelSource
   enableRankingView?: boolean
   rankingItems?: UserSpendingRankingItem[]
   rankingTotalActualCost?: number
@@ -225,12 +264,16 @@ const props = withDefaults(defineProps<{
   rankingTotalTokens?: number
   loading?: boolean
   metric?: DistributionMetric
+  showSourceToggle?: boolean
   showMetricToggle?: boolean
   rankingLoading?: boolean
   rankingError?: boolean
   startDate?: string
   endDate?: string
 }>(), {
+  upstreamModelStats: () => [],
+  mappingModelStats: () => [],
+  source: 'requested',
   enableRankingView: false,
   rankingItems: () => [],
   rankingTotalActualCost: 0,
@@ -238,6 +281,7 @@ const props = withDefaults(defineProps<{
   rankingTotalTokens: 0,
   loading: false,
   metric: 'tokens',
+  showSourceToggle: false,
   showMetricToggle: false,
   rankingLoading: false,
   rankingError: false
@@ -261,6 +305,7 @@ const toggleBreakdown = async (type: string, id: string) => {
       start_date: props.startDate,
       end_date: props.endDate,
       model: id,
+      model_source: props.source,
     })
     breakdownItems.value = res.users || []
   } catch {
@@ -272,6 +317,7 @@ const toggleBreakdown = async (type: string, id: string) => {
 
 const emit = defineEmits<{
   'update:metric': [value: DistributionMetric]
+  'update:source': [value: ModelSource]
   'ranking-click': [item: UserSpendingRankingItem]
 }>()
 
@@ -294,14 +340,19 @@ const chartColors = [
 ]
 
 const displayModelStats = computed(() => {
-  if (!props.modelStats?.length) return []
+  const sourceStats = props.source === 'upstream'
+    ? props.upstreamModelStats
+    : props.source === 'mapping'
+      ? props.mappingModelStats
+      : props.modelStats
+  if (!sourceStats?.length) return []
 
   const metricKey = props.metric === 'actual_cost' ? 'actual_cost' : 'total_tokens'
-  return [...props.modelStats].sort((a, b) => b[metricKey] - a[metricKey])
+  return [...sourceStats].sort((a, b) => b[metricKey] - a[metricKey])
 })
 
 const chartData = computed(() => {
-  if (!props.modelStats?.length) return null
+  if (!displayModelStats.value.length) return null
 
   return {
     labels: displayModelStats.value.map((m) => m.model),

frontend/src/i18n/locales/en.ts

@@ -718,11 +718,14 @@ export default {
     exporting: 'Exporting...',
     preparingExport: 'Preparing export...',
     model: 'Model',
+    requestedModel: 'Requested',
+    upstreamModel: 'Upstream',
     reasoningEffort: 'Reasoning Effort',
     endpoint: 'Endpoint',
     endpointDistribution: 'Endpoint Distribution',
     inbound: 'Inbound',
     upstream: 'Upstream',
+    mapping: 'Mapping',
     path: 'Path',
     inboundEndpoint: 'Inbound Endpoint',
     upstreamEndpoint: 'Upstream Endpoint',

frontend/src/i18n/locales/zh.ts

@@ -723,11 +723,14 @@ export default {
     exporting: '导出中...',
     preparingExport: '正在准备导出...',
     model: '模型',
+    requestedModel: '请求',
+    upstreamModel: '上游',
     reasoningEffort: '推理强度',
     endpoint: '端点',
     endpointDistribution: '端点分布',
     inbound: '入站',
     upstream: '上游',
+    mapping: '映射',
     path: '路径',
     inboundEndpoint: '入站端点',
     upstreamEndpoint: '上游端点',

frontend/src/types/index.ts

@@ -975,6 +975,7 @@ export interface UsageLog {
   account_id: number | null
   request_id: string
   model: string
+  upstream_model?: string | null
   service_tier?: string | null
   reasoning_effort?: string | null
   inbound_endpoint?: string | null

frontend/src/views/admin/UsageView.vue

@@ -24,9 +24,13 @@
         </div>
         <div class="grid grid-cols-1 gap-6 lg:grid-cols-2">
           <ModelDistributionChart
+            v-model:source="modelDistributionSource"
             v-model:metric="modelDistributionMetric"
-            :model-stats="modelStats"
-            :loading="chartsLoading"
+            :model-stats="requestedModelStats"
+            :upstream-model-stats="upstreamModelStats"
+            :mapping-model-stats="mappingModelStats"
+            :loading="modelStatsLoading"
+            :show-source-toggle="true"
             :show-metric-toggle="true"
             :start-date="startDate"
             :end-date="endDate"
@@ -115,7 +119,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, reactive, computed, onMounted, onUnmounted } from 'vue'
+import { ref, reactive, computed, onMounted, onUnmounted, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { saveAs } from 'file-saver'
 import { useRoute } from 'vue-router'
@@ -136,10 +140,17 @@ const { t } = useI18n()
 const appStore = useAppStore()
 type DistributionMetric = 'tokens' | 'actual_cost'
 type EndpointSource = 'inbound' | 'upstream' | 'path'
+type ModelDistributionSource = 'requested' | 'upstream' | 'mapping'
 const route = useRoute()
 const usageStats = ref<AdminUsageStatsResponse | null>(null); const usageLogs = ref<AdminUsageLog[]>([]); const loading = ref(false); const exporting = ref(false)
-const trendData = ref<TrendDataPoint[]>([]); const modelStats = ref<ModelStat[]>([]); const groupStats = ref<GroupStat[]>([]); const chartsLoading = ref(false); const granularity = ref<'day' | 'hour'>('hour')
+const trendData = ref<TrendDataPoint[]>([]); const requestedModelStats = ref<ModelStat[]>([]); const upstreamModelStats = ref<ModelStat[]>([]); const mappingModelStats = ref<ModelStat[]>([]); const groupStats = ref<GroupStat[]>([]); const chartsLoading = ref(false); const modelStatsLoading = ref(false); const granularity = ref<'day' | 'hour'>('hour')
 const modelDistributionMetric = ref<DistributionMetric>('tokens')
+const modelDistributionSource = ref<ModelDistributionSource>('requested')
+const loadedModelSources = reactive<Record<ModelDistributionSource, boolean>>({
+  requested: false,
+  upstream: false,
+  mapping: false,
+})
 const groupDistributionMetric = ref<DistributionMetric>('tokens')
 const endpointDistributionMetric = ref<DistributionMetric>('tokens')
 const endpointDistributionSource = ref<EndpointSource>('inbound')
@@ -150,6 +161,7 @@ const endpointStatsLoading = ref(false)
 let abortController: AbortController | null = null; let exportAbortController: AbortController | null = null
 let chartReqSeq = 0
 let statsReqSeq = 0
+let modelStatsReqSeq = 0
 const exportProgress = reactive({ show: false, progress: 0, current: 0, total: 0, estimatedTime: '' })
 const cleanupDialogVisible = ref(false)
 // Balance history modal state
@@ -269,6 +281,68 @@ const loadStats = async () => {
     if (seq === statsReqSeq) endpointStatsLoading.value = false
   }
 }
+
+const resetModelStatsCache = () => {
+  requestedModelStats.value = []
+  upstreamModelStats.value = []
+  mappingModelStats.value = []
+  loadedModelSources.requested = false
+  loadedModelSources.upstream = false
+  loadedModelSources.mapping = false
+}
+
+const loadModelStats = async (source: ModelDistributionSource, force = false) => {
+  if (!force && loadedModelSources[source]) {
+    return
+  }
+
+  const seq = ++modelStatsReqSeq
+  modelStatsLoading.value = true
+  try {
+    const requestType = filters.value.request_type
+    const legacyStream = requestType ? requestTypeToLegacyStream(requestType) : filters.value.stream
+    const baseParams = {
+      start_date: filters.value.start_date || startDate.value,
+      end_date: filters.value.end_date || endDate.value,
+      user_id: filters.value.user_id,
+      model: filters.value.model,
+      api_key_id: filters.value.api_key_id,
+      account_id: filters.value.account_id,
+      group_id: filters.value.group_id,
+      request_type: requestType,
+      stream: legacyStream === null ? undefined : legacyStream,
+      billing_type: filters.value.billing_type,
+    }
+
+    const response = await adminAPI.dashboard.getModelStats({ ...baseParams, model_source: source })
+
+    if (seq !== modelStatsReqSeq) return
+
+    const models = response.models || []
+    if (source === 'requested') {
+      requestedModelStats.value = models
+    } else if (source === 'upstream') {
+      upstreamModelStats.value = models
+    } else {
+      mappingModelStats.value = models
+    }
+    loadedModelSources[source] = true
+  } catch (error) {
+    if (seq !== modelStatsReqSeq) return
+    console.error('Failed to load model stats:', error)
+    if (source === 'requested') {
+      requestedModelStats.value = []
+    } else if (source === 'upstream') {
+      upstreamModelStats.value = []
+    } else {
+      mappingModelStats.value = []
+    }
+    loadedModelSources[source] = false
+  } finally {
+    if (seq === modelStatsReqSeq) modelStatsLoading.value = false
+  }
+}
+
 const loadChartData = async () => {
   const seq = ++chartReqSeq
   chartsLoading.value = true
@@ -289,18 +363,30 @@ const loadChartData = async () => {
       billing_type: filters.value.billing_type,
       include_stats: false,
       include_trend: true,
-      include_model_stats: true,
+      include_model_stats: false,
       include_group_stats: true,
       include_users_trend: false
     })
     if (seq !== chartReqSeq) return
     trendData.value = snapshot.trend || []
-    modelStats.value = snapshot.models || []
     groupStats.value = snapshot.groups || []
   } catch (error) { console.error('Failed to load chart data:', error) } finally { if (seq === chartReqSeq) chartsLoading.value = false }
 }
-const applyFilters = () => { pagination.page = 1; loadLogs(); loadStats(); loadChartData() }
-const refreshData = () => { loadLogs(); loadStats(); loadChartData() }
+const applyFilters = () => {
+  pagination.page = 1
+  resetModelStatsCache()
+  loadLogs()
+  loadStats()
+  loadModelStats(modelDistributionSource.value, true)
+  loadChartData()
+}
+const refreshData = () => {
+  resetModelStatsCache()
+  loadLogs()
+  loadStats()
+  loadModelStats(modelDistributionSource.value, true)
+  loadChartData()
+}
 const resetFilters = () => {
   const range = getLast24HoursRangeDates()
   startDate.value = range.start
@@ -329,7 +415,7 @@ const exportToExcel = async () => {
     const XLSX = await import('xlsx')
     const headers = [
       t('usage.time'), t('admin.usage.user'), t('usage.apiKeyFilter'),
-      t('admin.usage.account'), t('usage.model'), t('usage.reasoningEffort'), t('admin.usage.group'),
+      t('admin.usage.account'), t('usage.model'), t('usage.upstreamModel'), t('usage.reasoningEffort'), t('admin.usage.group'),
       t('usage.inboundEndpoint'), t('usage.upstreamEndpoint'),
       t('usage.type'),
       t('admin.usage.inputTokens'), t('admin.usage.outputTokens'),
@@ -348,7 +434,7 @@ const exportToExcel = async () => {
       if (c.signal.aborted) break; if (p === 1) { total = res.total; exportProgress.total = total }
       const rows = (res.items || []).map((log: AdminUsageLog) => [
         log.created_at, log.user?.email || '', log.api_key?.name || '', log.account?.name || '', log.model,
-        formatReasoningEffort(log.reasoning_effort), log.group?.name || '',
+        log.upstream_model || '', formatReasoningEffort(log.reasoning_effort), log.group?.name || '',
         log.inbound_endpoint || '', log.upstream_endpoint || '', getRequestTypeLabel(log),
         log.input_tokens, log.output_tokens, log.cache_read_tokens, log.cache_creation_tokens,
         log.input_cost?.toFixed(6) || '0.000000', log.output_cost?.toFixed(6) || '0.000000',
@@ -458,6 +544,7 @@ onMounted(() => {
   applyRouteQueryFilters()
   loadLogs()
   loadStats()
+  loadModelStats(modelDistributionSource.value, true)
   window.setTimeout(() => {
     void loadChartData()
   }, 120)
@@ -465,4 +552,8 @@ onMounted(() => {
   document.addEventListener('click', handleColumnClickOutside)
 })
 onUnmounted(() => { abortController?.abort(); exportAbortController?.abort(); document.removeEventListener('click', handleColumnClickOutside) })
+
+watch(modelDistributionSource, (source) => {
+  void loadModelStats(source)
+})
 </script>