diff --git a/backend/src/db/index.ts b/backend/src/db/index.ts
index c433623..076b4ab 100644
--- a/backend/src/db/index.ts
+++ b/backend/src/db/index.ts
@@ -947,11 +947,17 @@ export async function getModelsWithProviderBySystemName(
 
 /**
  * list unique system names (for global model registry)
+ * Returns active model names and archived names (deleted but referenced by historical requests)
  */
 export async function listUniqueSystemNames(
   modelType?: ModelTypeEnumType,
-): Promise<string[]> {
+): Promise<{
+  active: string[];
+  archived: { systemName: string; modelType: "chat" | "embedding" }[];
+}> {
   logger.debug("listUniqueSystemNames", modelType);
+
+  // Get active model names (non-deleted models with non-deleted providers)
   const r = await db
     .selectDistinct({ systemName: schema.ModelsTable.systemName })
     .from(schema.ModelsTable)
@@ -967,7 +973,40 @@ export async function listUniqueSystemNames(
       ),
     )
     .orderBy(asc(schema.ModelsTable.systemName));
-  return r.map((x) => x.systemName);
+  const active = r.map((x) => x.systemName);
+  const activeSet = new Set(active);
+
+  // Get archived model names: exist in completions/embeddings but not in active models
+  // Each model tagged with its type based on which table it comes from
+  const historicalResult = await db.execute(sql`
+    SELECT model AS name, 'chat' AS model_type FROM completions WHERE deleted = false
+    UNION
+    SELECT model AS name, 'embedding' AS model_type FROM embeddings WHERE deleted = false
+  `);
+  const historicalRows = historicalResult as unknown as {
+    name: string;
+    model_type: "chat" | "embedding";
+  }[];
+
+  // Filter out active models and respect modelType filter
+  const archivedMap = new Map<
+    string,
+    "chat" | "embedding"
+  >();
+  for (const row of historicalRows) {
+    if (activeSet.has(row.name)) continue;
+    if (modelType && row.model_type !== modelType) continue;
+    // If a name appears in both tables, prefer 'chat' (it's the more common case)
+    if (!archivedMap.has(row.name)) {
+      archivedMap.set(row.name, row.model_type);
+    }
+  }
+
+  const archived = Array.from(archivedMap.entries())
+    .sort(([a], [b]) => a.localeCompare(b))
+    .map(([systemName, mt]) => ({ systemName, modelType: mt }));
+
+  return { active, archived };
 }
 
 /**
diff --git a/frontend/src/i18n/locales/en-US.json b/frontend/src/i18n/locales/en-US.json
index a1a08fa..4299bf8 100644
--- a/frontend/src/i18n/locales/en-US.json
+++ b/frontend/src/i18n/locales/en-US.json
@@ -331,6 +331,8 @@
   "pages.models.registry.WeightConfiguration": "Weight Configuration",
   "pages.models.registry.History": "History",
   "pages.models.registry.ViewHistory": "View request history",
+  "pages.models.registry.Archived": "Archived",
+  "pages.models.registry.ArchivedTooltip": "This model has been deleted but has historical requests",
   "routes.models.Title": "Models",
   "routes.models.Description": "Configure model providers and global models.",
   "routes.models.nav.Providers": "Model Providers",
diff --git a/frontend/src/i18n/locales/zh-CN.json b/frontend/src/i18n/locales/zh-CN.json
index ea02d0e..baa9aff 100644
--- a/frontend/src/i18n/locales/zh-CN.json
+++ b/frontend/src/i18n/locales/zh-CN.json
@@ -332,6 +332,8 @@
   "pages.models.registry.WeightConfiguration": "权重配置",
   "pages.models.registry.History": "历史",
   "pages.models.registry.ViewHistory": "查看请求历史",
+  "pages.models.registry.Archived": "已归档",
+  "pages.models.registry.ArchivedTooltip": "该模型已删除但存在历史请求记录",
   "routes.models.Title": "模型",
   "routes.models.Description": "配置模型供应商和全局模型。",
   "routes.models.nav.Providers": "模型供应商",
diff --git a/frontend/src/pages/models/models-registry-table.tsx b/frontend/src/pages/models/models-registry-table.tsx
index 4d0487e..6c8f67f 100644
--- a/frontend/src/pages/models/models-registry-table.tsx
+++ b/frontend/src/pages/models/models-registry-table.tsx
@@ -120,7 +120,7 @@ function ModelsBySystemNameTable({ systemName }: { systemName: string }) {
   const { data: models = [], isLoading } = useQuery({
     queryKey: ['models', 'by-system-name', systemName],
     queryFn: async () => {
-      const { data, error } = await api.admin.models['by-system-name'][systemName].get()
+      const { data, error } = await api.admin.models['by-system-name'][encodeURIComponent(systemName)].get()
       if (error) throw error
       return data as ModelWithProvider[]
     },
@@ -128,7 +128,7 @@ function ModelsBySystemNameTable({ systemName }: { systemName: string }) {
 
   const updateWeightsMutation = useMutation({
     mutationFn: async (weights: { modelId: number; weight: number }[]) => {
-      const { error } = await api.admin.models['by-system-name'][systemName].weights.put({
+      const { error } = await api.admin.models['by-system-name'][encodeURIComponent(systemName)].weights.put({
         weights,
       })
       if (error) throw error
diff --git a/frontend/src/pages/settings/models-settings-page.tsx b/frontend/src/pages/settings/models-settings-page.tsx
index cf8a007..eb1be7f 100644
--- a/frontend/src/pages/settings/models-settings-page.tsx
+++ b/frontend/src/pages/settings/models-settings-page.tsx
@@ -1,7 +1,7 @@
 import { useEffect, useState } from 'react'
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query'
 import { useNavigate } from '@tanstack/react-router'
-import { CpuIcon, HistoryIcon } from 'lucide-react'
+import { ArchiveIcon, CpuIcon, HistoryIcon } from 'lucide-react'
 import { useTranslation } from 'react-i18next'
 import { toast } from 'sonner'
 
@@ -25,8 +25,19 @@ interface ModelWithProvider {
   }
 }
 
-export function ModelsSettingsPage({ systemNames }: { systemNames: string[] }) {
+interface ArchivedModel {
+  systemName: string
+  modelType: 'chat' | 'embedding'
+}
+
+interface ModelsSettingsPageProps {
+  activeSystemNames: string[]
+  archivedSystemNames: ArchivedModel[]
+}
+
+export function ModelsSettingsPage({ activeSystemNames, archivedSystemNames }: ModelsSettingsPageProps) {
   const { t } = useTranslation()
+  const hasAny = activeSystemNames.length > 0 || archivedSystemNames.length > 0
 
   return (
     <div className="space-y-8">
@@ -36,7 +47,7 @@ export function ModelsSettingsPage({ systemNames }: { systemNames: string[] }) {
           <CardDescription className="text-sm">{t('pages.models.registry.Description')}</CardDescription>
         </CardHeader>
         <CardContent>
-          {systemNames.length > 0 ? (
+          {hasAny ? (
             <Table>
               <TableHeader>
                 <TableRow>
@@ -47,9 +58,12 @@ export function ModelsSettingsPage({ systemNames }: { systemNames: string[] }) {
                 </TableRow>
               </TableHeader>
               <TableBody>
-                {systemNames.map((systemName) => (
+                {activeSystemNames.map((systemName) => (
                   <ModelRow key={systemName} systemName={systemName} />
                 ))}
+                {archivedSystemNames.map((item) => (
+                  <ArchivedModelRow key={item.systemName} systemName={item.systemName} modelType={item.modelType} />
+                ))}
               </TableBody>
             </Table>
           ) : (
@@ -69,7 +83,7 @@ function ModelRow({ systemName }: { systemName: string }) {
   const { data: models = [], isLoading } = useQuery({
     queryKey: ['models', 'by-system-name', systemName],
     queryFn: async () => {
-      const { data, error } = await api.admin.models['by-system-name'][systemName].get()
+      const { data, error } = await api.admin.models['by-system-name'][encodeURIComponent(systemName)].get()
       if (error) throw error
       return data as ModelWithProvider[]
     },
@@ -157,6 +171,50 @@ function ModelRow({ systemName }: { systemName: string }) {
   )
 }
 
+function ArchivedModelRow({ systemName, modelType }: { systemName: string; modelType: 'chat' | 'embedding' }) {
+  const { t } = useTranslation()
+  const navigate = useNavigate()
+
+  const handleHistoryClick = (e: React.MouseEvent) => {
+    e.stopPropagation()
+    if (modelType === 'embedding') {
+      navigate({ to: '/embeddings', search: { model: systemName } })
+    } else {
+      navigate({ to: '/requests', search: { model: systemName } })
+    }
+  }
+
+  return (
+    <TableRow className="opacity-50">
+      <TableCell>
+        <div className="flex items-center gap-3">
+          <ArchiveIcon className="text-muted-foreground/50 size-5" />
+          <span className="text-muted-foreground font-mono text-sm font-medium line-through">{systemName}</span>
+        </div>
+      </TableCell>
+      <TableCell>
+        <span className="text-muted-foreground text-sm">-</span>
+      </TableCell>
+      <TableCell>
+        <span className="text-muted-foreground text-sm italic" title={t('pages.models.registry.ArchivedTooltip')}>
+          {t('pages.models.registry.Archived')}
+        </span>
+      </TableCell>
+      <TableCell className="text-center">
+        <Button
+          variant="ghost"
+          size="sm"
+          className="size-8 p-0"
+          onClick={handleHistoryClick}
+          title={t('pages.models.registry.ViewHistory')}
+        >
+          <HistoryIcon className="size-4" />
+        </Button>
+      </TableCell>
+    </TableRow>
+  )
+}
+
 interface LoadBalancingDialogProps {
   open: boolean
   onOpenChange: (open: boolean) => void
@@ -182,7 +240,7 @@ function LoadBalancingDialog({ open, onOpenChange, systemName, models }: LoadBal
 
   const updateWeightsMutation = useMutation({
     mutationFn: async (weights: { modelId: number; weight: number }[]) => {
-      const { error } = await api.admin.models['by-system-name'][systemName].weights.put({
+      const { error } = await api.admin.models['by-system-name'][encodeURIComponent(systemName)].weights.put({
         weights,
       })
       if (error) throw error
diff --git a/frontend/src/routes/models/registry.tsx b/frontend/src/routes/models/registry.tsx
index 7baabab..d281591 100644
--- a/frontend/src/routes/models/registry.tsx
+++ b/frontend/src/routes/models/registry.tsx
@@ -27,5 +27,5 @@ export const Route = createFileRoute('/models/registry')({
 function RouteComponent() {
   const { data } = useSuspenseQuery(systemNamesQueryOptions())
 
-  return <ModelsSettingsPage systemNames={data} />
+  return <ModelsSettingsPage activeSystemNames={data.active} archivedSystemNames={data.archived} />
 }