diff --git a/app/admin/audit/page.tsx b/app/admin/audit/page.tsx
index ce83ad0..809abd7 100644
--- a/app/admin/audit/page.tsx
+++ b/app/admin/audit/page.tsx
@@ -2,6 +2,7 @@ import { getAuditList } from '@/lib/admin/list';
 import { AuditTable } from './audit-table';
 
 export const dynamic = 'force-dynamic';
+export const revalidate = 0;
 
 const PER_PAGE = 50;
 
diff --git a/app/admin/page.tsx b/app/admin/page.tsx
index 4e1f3ed..6407460 100644
--- a/app/admin/page.tsx
+++ b/app/admin/page.tsx
@@ -4,6 +4,7 @@ import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { formatBytes, formatDate } from '@/lib/format';
 
 export const dynamic = 'force-dynamic';
+export const revalidate = 0;
 
 type OverQuotaRow = {
   user_id: string;
diff --git a/app/admin/tunnels/page.tsx b/app/admin/tunnels/page.tsx
index e8efb4c..34d4b23 100644
--- a/app/admin/tunnels/page.tsx
+++ b/app/admin/tunnels/page.tsx
@@ -2,6 +2,7 @@ import { getTunnelsList } from '@/lib/admin/list';
 import { TunnelsTable } from './tunnels-table';
 
 export const dynamic = 'force-dynamic';
+export const revalidate = 0;
 
 const PER_PAGE = 25;
 
diff --git a/app/admin/users/[id]/page.tsx b/app/admin/users/[id]/page.tsx
index b3fa7d5..c380ccd 100644
--- a/app/admin/users/[id]/page.tsx
+++ b/app/admin/users/[id]/page.tsx
@@ -7,6 +7,7 @@ import { formatBytes, formatDate } from '@/lib/format';
 import { UserActions } from './user-actions';
 
 export const dynamic = 'force-dynamic';
+export const revalidate = 0;
 
 type TunnelRow = {
   subdomain: string;
diff --git a/app/admin/users/page.tsx b/app/admin/users/page.tsx
index 93a4c99..2c3a7da 100644
--- a/app/admin/users/page.tsx
+++ b/app/admin/users/page.tsx
@@ -2,6 +2,7 @@ import { getUsersList } from '@/lib/admin/list';
 import { UsersTable } from './users-table';
 
 export const dynamic = 'force-dynamic';
+export const revalidate = 0;
 
 const PER_PAGE = 25;
 
diff --git a/app/api/admin/audit/route.ts b/app/api/admin/audit/route.ts
index 898f0fc..93a2540 100644
--- a/app/api/admin/audit/route.ts
+++ b/app/api/admin/audit/route.ts
@@ -1,7 +1,8 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { parsePageParam, parsePerPageParam } from '@/lib/admin/validators';
 import { getAuditList } from '@/lib/admin/list';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -23,8 +24,9 @@ export async function GET(req: NextRequest) {
       action,
       targetType,
     });
-    return NextResponse.json({ entries, total, page, perPage });
+    return jsonNoStore({ entries, total, page, perPage });
   } catch (e) {
-    return NextResponse.json({ error: (e as Error).message }, { status: 500 });
+    console.error('admin audit list failed', e);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
 }
diff --git a/app/api/admin/metrics/route.ts b/app/api/admin/metrics/route.ts
index 4874d23..d0b0653 100644
--- a/app/api/admin/metrics/route.ts
+++ b/app/api/admin/metrics/route.ts
@@ -1,6 +1,6 @@
-import { NextResponse } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { computeMetrics } from '@/lib/admin/metrics';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -10,5 +10,5 @@ export async function GET() {
   if (!auth.ok) return auth.response;
 
   const metrics = await computeMetrics();
-  return NextResponse.json(metrics);
+  return jsonNoStore(metrics);
 }
diff --git a/app/api/admin/reserved/route.ts b/app/api/admin/reserved/route.ts
index 4bfd747..908d2aa 100644
--- a/app/api/admin/reserved/route.ts
+++ b/app/api/admin/reserved/route.ts
@@ -1,8 +1,9 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { logAdminAction } from '@/lib/auth/audit';
 import { RESERVED_SUBDOMAINS } from '@/lib/validation';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -19,10 +20,11 @@ export async function GET() {
     .select('name, created_at')
     .order('name', { ascending: true });
   if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin reserved list failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
 
-  return NextResponse.json({
+  return jsonNoStore({
     reserved: data ?? [],
     hardcoded: Array.from(RESERVED_SUBDOMAINS).sort(),
   });
@@ -36,14 +38,14 @@ export async function POST(req: NextRequest) {
   try {
     body = (await req.json()) as { name?: unknown };
   } catch {
-    return NextResponse.json({ error: 'invalid json' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid json' }, { status: 400 });
   }
   if (typeof body.name !== 'string') {
-    return NextResponse.json({ error: 'name must be a string' }, { status: 400 });
+    return jsonNoStore({ error: 'name must be a string' }, { status: 400 });
   }
   const name = body.name.trim().toLowerCase();
   if (!NAME_RE.test(name)) {
-    return NextResponse.json(
+    return jsonNoStore(
       { error: 'name must be 1–63 chars, lowercase a–z, 0–9, hyphen' },
       { status: 400 },
     );
@@ -54,7 +56,8 @@ export async function POST(req: NextRequest) {
     .from('reserved_subdomains')
     .upsert({ name }, { onConflict: 'name' });
   if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin reserved add failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
 
   await logAdminAction(auth.user, {
@@ -63,7 +66,7 @@ export async function POST(req: NextRequest) {
     target_id: name,
   });
 
-  return NextResponse.json({ ok: true, name });
+  return jsonNoStore({ ok: true, name });
 }
 
 export async function DELETE(req: NextRequest) {
@@ -73,7 +76,7 @@ export async function DELETE(req: NextRequest) {
   const url = new URL(req.url);
   const name = (url.searchParams.get('name') ?? '').trim().toLowerCase();
   if (!name) {
-    return NextResponse.json({ error: 'name is required' }, { status: 400 });
+    return jsonNoStore({ error: 'name is required' }, { status: 400 });
   }
 
   const admin = getSupabaseAdmin();
@@ -82,7 +85,8 @@ export async function DELETE(req: NextRequest) {
     .delete()
     .eq('name', name);
   if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin reserved remove failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
 
   await logAdminAction(auth.user, {
@@ -91,5 +95,5 @@ export async function DELETE(req: NextRequest) {
     target_id: name,
   });
 
-  return NextResponse.json({ ok: true });
+  return jsonNoStore({ ok: true });
 }
diff --git a/app/api/admin/tunnels/[id]/active/route.ts b/app/api/admin/tunnels/[id]/active/route.ts
index 6fb4261..7bcc0d6 100644
--- a/app/api/admin/tunnels/[id]/active/route.ts
+++ b/app/api/admin/tunnels/[id]/active/route.ts
@@ -1,9 +1,10 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { logAdminAction } from '@/lib/auth/audit';
 import { isUuid, parseBoolean } from '@/lib/admin/validators';
 import { redisSet } from '@/lib/redis';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -17,18 +18,18 @@ export async function POST(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid tunnel id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid tunnel id' }, { status: 400 });
   }
 
   let body: { is_active?: unknown };
   try {
     body = (await req.json()) as { is_active?: unknown };
   } catch {
-    return NextResponse.json({ error: 'invalid json' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid json' }, { status: 400 });
   }
   const isActive = parseBoolean(body.is_active);
   if (isActive === null) {
-    return NextResponse.json(
+    return jsonNoStore(
       { error: 'is_active must be a boolean' },
       { status: 400 },
     );
@@ -42,10 +43,11 @@ export async function POST(
     .select('subdomain')
     .maybeSingle<{ subdomain: string }>();
   if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin tunnel.active failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
   if (!data) {
-    return NextResponse.json({ error: 'tunnel not found' }, { status: 404 });
+    return jsonNoStore({ error: 'tunnel not found' }, { status: 404 });
   }
 
   // Best-effort live kill-switch (never throws).
@@ -58,5 +60,5 @@ export async function POST(
     details: { subdomain: data.subdomain, is_active: isActive },
   });
 
-  return NextResponse.json({ ok: true, is_active: isActive });
+  return jsonNoStore({ ok: true, is_active: isActive });
 }
diff --git a/app/api/admin/tunnels/[id]/quota/route.ts b/app/api/admin/tunnels/[id]/quota/route.ts
index cc16fc9..5838d25 100644
--- a/app/api/admin/tunnels/[id]/quota/route.ts
+++ b/app/api/admin/tunnels/[id]/quota/route.ts
@@ -1,8 +1,9 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { logAdminAction } from '@/lib/auth/audit';
 import { isUuid, parsePositiveInt } from '@/lib/admin/validators';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -19,18 +20,18 @@ export async function POST(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid tunnel id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid tunnel id' }, { status: 400 });
   }
 
   let body: { quota_bytes?: unknown };
   try {
     body = (await req.json()) as { quota_bytes?: unknown };
   } catch {
-    return NextResponse.json({ error: 'invalid json' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid json' }, { status: 400 });
   }
   const parsed = parsePositiveInt(body.quota_bytes, MAX_QUOTA);
   if (!parsed.ok) {
-    return NextResponse.json(
+    return jsonNoStore(
       { error: `quota_bytes ${parsed.error}` },
       { status: 400 },
     );
@@ -44,10 +45,11 @@ export async function POST(
     .select('subdomain')
     .maybeSingle<{ subdomain: string }>();
   if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin tunnel.quota failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
   if (!data) {
-    return NextResponse.json({ error: 'tunnel not found' }, { status: 404 });
+    return jsonNoStore({ error: 'tunnel not found' }, { status: 404 });
   }
 
   await logAdminAction(auth.user, {
@@ -57,5 +59,5 @@ export async function POST(
     details: { subdomain: data.subdomain, quota_bytes: parsed.value },
   });
 
-  return NextResponse.json({ ok: true, quota_bytes: parsed.value });
+  return jsonNoStore({ ok: true, quota_bytes: parsed.value });
 }
diff --git a/app/api/admin/tunnels/[id]/reassign/route.ts b/app/api/admin/tunnels/[id]/reassign/route.ts
index 46d961b..7436986 100644
--- a/app/api/admin/tunnels/[id]/reassign/route.ts
+++ b/app/api/admin/tunnels/[id]/reassign/route.ts
@@ -1,10 +1,11 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { logAdminAction } from '@/lib/auth/audit';
 import { isUuid } from '@/lib/admin/validators';
 import { validateSubdomain } from '@/lib/validation';
 import { isSubdomainReserved } from '@/lib/admin/reserved';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -18,26 +19,26 @@ export async function POST(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid tunnel id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid tunnel id' }, { status: 400 });
   }
 
   let body: { subdomain?: unknown };
   try {
     body = (await req.json()) as { subdomain?: unknown };
   } catch {
-    return NextResponse.json({ error: 'invalid json' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid json' }, { status: 400 });
   }
 
   // Same validation as the user-facing claim flow (format + hardcoded reserved).
   const v = validateSubdomain(body.subdomain);
   if (!v.ok) {
-    return NextResponse.json({ error: v.error }, { status: 400 });
+    return jsonNoStore({ error: v.error }, { status: 400 });
   }
   const subdomain = v.value;
 
   // Also reject anything reserved in the DB table.
   if (await isSubdomainReserved(subdomain)) {
-    return NextResponse.json(
+    return jsonNoStore(
       { error: `'${subdomain}' is reserved` },
       { status: 400 },
     );
@@ -52,7 +53,7 @@ export async function POST(
     .eq('subdomain', subdomain)
     .maybeSingle<{ user_id: string }>();
   if (existing && existing.user_id !== id) {
-    return NextResponse.json({ error: 'subdomain taken' }, { status: 409 });
+    return jsonNoStore({ error: 'subdomain taken' }, { status: 409 });
   }
 
   const { data, error } = await admin
@@ -64,12 +65,13 @@ export async function POST(
   if (error) {
     const code = (error as { code?: string }).code;
     if (code === '23505') {
-      return NextResponse.json({ error: 'subdomain taken' }, { status: 409 });
+      return jsonNoStore({ error: 'subdomain taken' }, { status: 409 });
     }
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin tunnel.reassign failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
   if (!data) {
-    return NextResponse.json({ error: 'tunnel not found' }, { status: 404 });
+    return jsonNoStore({ error: 'tunnel not found' }, { status: 404 });
   }
 
   await logAdminAction(auth.user, {
@@ -79,5 +81,5 @@ export async function POST(
     details: { subdomain },
   });
 
-  return NextResponse.json({ ok: true, subdomain });
+  return jsonNoStore({ ok: true, subdomain });
 }
diff --git a/app/api/admin/tunnels/[id]/regenerate-token/route.ts b/app/api/admin/tunnels/[id]/regenerate-token/route.ts
index 6fa01db..bb7ee05 100644
--- a/app/api/admin/tunnels/[id]/regenerate-token/route.ts
+++ b/app/api/admin/tunnels/[id]/regenerate-token/route.ts
@@ -1,9 +1,10 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { randomBytes } from 'node:crypto';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { logAdminAction } from '@/lib/auth/audit';
 import { isUuid } from '@/lib/admin/validators';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -17,7 +18,7 @@ export async function POST(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid tunnel id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid tunnel id' }, { status: 400 });
   }
 
   const token = randomBytes(32).toString('hex');
@@ -30,10 +31,11 @@ export async function POST(
     .select('subdomain, token')
     .maybeSingle<{ subdomain: string; token: string }>();
   if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin tunnel.regenerate_token failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
   if (!data) {
-    return NextResponse.json({ error: 'tunnel not found' }, { status: 404 });
+    return jsonNoStore({ error: 'tunnel not found' }, { status: 404 });
   }
 
   await logAdminAction(auth.user, {
@@ -43,5 +45,5 @@ export async function POST(
     details: { subdomain: data.subdomain },
   });
 
-  return NextResponse.json({ ok: true, token: data.token });
+  return jsonNoStore({ ok: true, token: data.token });
 }
diff --git a/app/api/admin/tunnels/[id]/reset-usage/route.ts b/app/api/admin/tunnels/[id]/reset-usage/route.ts
index c1cb516..47bb784 100644
--- a/app/api/admin/tunnels/[id]/reset-usage/route.ts
+++ b/app/api/admin/tunnels/[id]/reset-usage/route.ts
@@ -1,8 +1,9 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { logAdminAction } from '@/lib/auth/audit';
 import { isUuid } from '@/lib/admin/validators';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -16,7 +17,7 @@ export async function POST(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid tunnel id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid tunnel id' }, { status: 400 });
   }
 
   const admin = getSupabaseAdmin();
@@ -27,10 +28,11 @@ export async function POST(
     .select('subdomain')
     .maybeSingle<{ subdomain: string }>();
   if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin tunnel.reset_usage failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
   if (!data) {
-    return NextResponse.json({ error: 'tunnel not found' }, { status: 404 });
+    return jsonNoStore({ error: 'tunnel not found' }, { status: 404 });
   }
 
   await logAdminAction(auth.user, {
@@ -40,5 +42,5 @@ export async function POST(
     details: { subdomain: data.subdomain },
   });
 
-  return NextResponse.json({ ok: true });
+  return jsonNoStore({ ok: true });
 }
diff --git a/app/api/admin/tunnels/[id]/route.ts b/app/api/admin/tunnels/[id]/route.ts
index c8204dd..c597232 100644
--- a/app/api/admin/tunnels/[id]/route.ts
+++ b/app/api/admin/tunnels/[id]/route.ts
@@ -1,9 +1,10 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { logAdminAction } from '@/lib/auth/audit';
 import { isUuid } from '@/lib/admin/validators';
 import { redisSet } from '@/lib/redis';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -17,7 +18,7 @@ export async function DELETE(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid tunnel id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid tunnel id' }, { status: 400 });
   }
 
   const admin = getSupabaseAdmin();
@@ -28,10 +29,11 @@ export async function DELETE(
     .select('subdomain')
     .maybeSingle<{ subdomain: string }>();
   if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin tunnel.delete failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
   if (!data) {
-    return NextResponse.json({ error: 'tunnel not found' }, { status: 404 });
+    return jsonNoStore({ error: 'tunnel not found' }, { status: 404 });
   }
 
   // Best-effort live kill-switch.
@@ -44,5 +46,5 @@ export async function DELETE(
     details: { subdomain: data.subdomain },
   });
 
-  return NextResponse.json({ ok: true });
+  return jsonNoStore({ ok: true });
 }
diff --git a/app/api/admin/tunnels/route.ts b/app/api/admin/tunnels/route.ts
index 6562173..c95cfa1 100644
--- a/app/api/admin/tunnels/route.ts
+++ b/app/api/admin/tunnels/route.ts
@@ -1,7 +1,8 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { parsePageParam, parsePerPageParam } from '@/lib/admin/validators';
 import { getTunnelsList } from '@/lib/admin/list';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -23,8 +24,9 @@ export async function GET(req: NextRequest) {
       search,
       status,
     });
-    return NextResponse.json({ tunnels, total, page, perPage });
+    return jsonNoStore({ tunnels, total, page, perPage });
   } catch (e) {
-    return NextResponse.json({ error: (e as Error).message }, { status: 500 });
+    console.error('admin tunnels list failed', e);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
 }
diff --git a/app/api/admin/users/[id]/ban/route.ts b/app/api/admin/users/[id]/ban/route.ts
index 5a243a3..1a943f5 100644
--- a/app/api/admin/users/[id]/ban/route.ts
+++ b/app/api/admin/users/[id]/ban/route.ts
@@ -1,8 +1,9 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { logAdminAction } from '@/lib/auth/audit';
 import { isUuid, parseBoolean } from '@/lib/admin/validators';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -19,10 +20,10 @@ export async function POST(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid user id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid user id' }, { status: 400 });
   }
   if (id === auth.user.id) {
-    return NextResponse.json(
+    return jsonNoStore(
       { error: 'you cannot ban your own account' },
       { status: 400 },
     );
@@ -32,11 +33,11 @@ export async function POST(
   try {
     body = (await req.json()) as { banned?: unknown };
   } catch {
-    return NextResponse.json({ error: 'invalid json' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid json' }, { status: 400 });
   }
   const banned = parseBoolean(body.banned);
   if (banned === null) {
-    return NextResponse.json(
+    return jsonNoStore(
       { error: 'banned must be a boolean' },
       { status: 400 },
     );
@@ -47,7 +48,8 @@ export async function POST(
     ban_duration: banned ? BAN_DURATION : 'none',
   } as { ban_duration: string });
   if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin user.ban failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
 
   await logAdminAction(auth.user, {
@@ -57,5 +59,5 @@ export async function POST(
     details: { banned },
   });
 
-  return NextResponse.json({ ok: true, banned });
+  return jsonNoStore({ ok: true, banned });
 }
diff --git a/app/api/admin/users/[id]/role/route.ts b/app/api/admin/users/[id]/role/route.ts
index 8b24f09..e1b478f 100644
--- a/app/api/admin/users/[id]/role/route.ts
+++ b/app/api/admin/users/[id]/role/route.ts
@@ -1,8 +1,9 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { logAdminAction } from '@/lib/auth/audit';
 import { isUuid } from '@/lib/admin/validators';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -16,10 +17,10 @@ export async function POST(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid user id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid user id' }, { status: 400 });
   }
   if (id === auth.user.id) {
-    return NextResponse.json(
+    return jsonNoStore(
       { error: 'you cannot change your own role' },
       { status: 400 },
     );
@@ -29,10 +30,10 @@ export async function POST(
   try {
     body = (await req.json()) as { role?: unknown };
   } catch {
-    return NextResponse.json({ error: 'invalid json' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid json' }, { status: 400 });
   }
   if (body.role !== 'admin' && body.role !== 'user') {
-    return NextResponse.json(
+    return jsonNoStore(
       { error: "role must be 'admin' or 'user'" },
       { status: 400 },
     );
@@ -45,7 +46,7 @@ export async function POST(
   const { data: existing, error: getErr } =
     await admin.auth.admin.getUserById(id);
   if (getErr || !existing.user) {
-    return NextResponse.json({ error: 'user not found' }, { status: 404 });
+    return jsonNoStore({ error: 'user not found' }, { status: 404 });
   }
   const merged = { ...(existing.user.app_metadata ?? {}), role };
 
@@ -53,7 +54,8 @@ export async function POST(
     app_metadata: merged,
   });
   if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+    console.error('admin user.role failed', error);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
 
   await logAdminAction(auth.user, {
@@ -63,5 +65,5 @@ export async function POST(
     details: { role },
   });
 
-  return NextResponse.json({ ok: true, role });
+  return jsonNoStore({ ok: true, role });
 }
diff --git a/app/api/admin/users/[id]/route.ts b/app/api/admin/users/[id]/route.ts
index 35e2e73..ece7dc5 100644
--- a/app/api/admin/users/[id]/route.ts
+++ b/app/api/admin/users/[id]/route.ts
@@ -1,8 +1,9 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { getSupabaseAdmin } from '@/lib/supabase/admin';
 import { logAdminAction } from '@/lib/auth/audit';
 import { isUuid } from '@/lib/admin/validators';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -27,7 +28,7 @@ export async function GET(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid user id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid user id' }, { status: 400 });
   }
 
   const admin = getSupabaseAdmin();
@@ -35,7 +36,7 @@ export async function GET(
   const { data: userRes, error: userErr } =
     await admin.auth.admin.getUserById(id);
   if (userErr || !userRes.user) {
-    return NextResponse.json({ error: 'user not found' }, { status: 404 });
+    return jsonNoStore({ error: 'user not found' }, { status: 404 });
   }
   const u = userRes.user;
 
@@ -54,7 +55,7 @@ export async function GET(
     .order('created_at', { ascending: false })
     .limit(25);
 
-  return NextResponse.json({
+  return jsonNoStore({
     user: {
       id: u.id,
       email: u.email ?? null,
@@ -88,10 +89,10 @@ export async function DELETE(
 
   const { id } = params;
   if (!isUuid(id)) {
-    return NextResponse.json({ error: 'invalid user id' }, { status: 400 });
+    return jsonNoStore({ error: 'invalid user id' }, { status: 400 });
   }
   if (id === auth.user.id) {
-    return NextResponse.json(
+    return jsonNoStore(
       { error: 'you cannot delete your own account' },
       { status: 400 },
     );
@@ -99,12 +100,32 @@ export async function DELETE(
 
   const admin = getSupabaseAdmin();
 
-  // Remove the tunnel row first (FK to auth.users).
-  await admin.from('tunnels').delete().eq('user_id', id);
+  // Delete the AUTH USER first. Only if that succeeds do we remove the tunnel
+  // row, so a mid-failure never leaves an orphaned auth user with a dangling
+  // tunnel (or half-deletes the tunnel of an already-gone user).
+  const { error: delErr } = await admin.auth.admin.deleteUser(id);
+  if (delErr) {
+    const httpStatus = (delErr as { status?: number }).status;
+    const message = (delErr.message ?? '').toLowerCase();
+    if (httpStatus === 404 || message.includes('not found')) {
+      return jsonNoStore({ error: 'user not found' }, { status: 404 });
+    }
+    console.error('admin user.delete: deleteUser failed', delErr);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
+  }
 
-  const { error } = await admin.auth.admin.deleteUser(id);
-  if (error) {
-    return NextResponse.json({ error: error.message }, { status: 500 });
+  // The auth user is gone, so no orphaned-user state is possible. Removing the
+  // tunnel row is best-effort cleanup: if it fails we log server-side but still
+  // report the (already-completed) user deletion as successful.
+  const { error: tunnelErr } = await admin
+    .from('tunnels')
+    .delete()
+    .eq('user_id', id);
+  if (tunnelErr) {
+    console.error(
+      `admin user.delete: tunnel cleanup failed for ${id}`,
+      tunnelErr,
+    );
   }
 
   await logAdminAction(auth.user, {
@@ -113,5 +134,5 @@ export async function DELETE(
     target_id: id,
   });
 
-  return NextResponse.json({ ok: true });
+  return jsonNoStore({ ok: true });
 }
diff --git a/app/api/admin/users/route.ts b/app/api/admin/users/route.ts
index 081759e..a6a577c 100644
--- a/app/api/admin/users/route.ts
+++ b/app/api/admin/users/route.ts
@@ -1,7 +1,8 @@
-import { NextResponse, type NextRequest } from 'next/server';
+import { type NextRequest } from 'next/server';
 import { requireAdminApi } from '@/lib/auth/admin-guard';
 import { parsePageParam, parsePerPageParam } from '@/lib/admin/validators';
 import { getUsersList } from '@/lib/admin/list';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export const runtime = 'nodejs';
 export const dynamic = 'force-dynamic';
@@ -17,8 +18,9 @@ export async function GET(req: NextRequest) {
 
   try {
     const { users, total } = await getUsersList({ page, perPage, search });
-    return NextResponse.json({ users, total, page, perPage });
+    return jsonNoStore({ users, total, page, perPage });
   } catch (e) {
-    return NextResponse.json({ error: (e as Error).message }, { status: 500 });
+    console.error('admin users list failed', e);
+    return jsonNoStore({ error: 'internal error' }, { status: 500 });
   }
 }
diff --git a/lib/admin/response.ts b/lib/admin/response.ts
new file mode 100644
index 0000000..c220944
--- /dev/null
+++ b/lib/admin/response.ts
@@ -0,0 +1,13 @@
+import { NextResponse } from 'next/server';
+
+/**
+ * Wrapper around NextResponse.json that marks the response uncacheable. All
+ * admin API responses must never be stored by browsers, proxies, or Next's
+ * own caches, since they reflect privileged, frequently-changing state.
+ */
+export function jsonNoStore(body: unknown, init?: ResponseInit): NextResponse {
+  const res = NextResponse.json(body, init);
+  res.headers.set('Cache-Control', 'no-store');
+  res.headers.set('Pragma', 'no-cache');
+  return res;
+}
diff --git a/lib/auth/admin-guard.ts b/lib/auth/admin-guard.ts
index 82780a2..0427bcb 100644
--- a/lib/auth/admin-guard.ts
+++ b/lib/auth/admin-guard.ts
@@ -1,7 +1,8 @@
 import { redirect } from 'next/navigation';
-import { NextResponse } from 'next/server';
+import type { NextResponse } from 'next/server';
 import type { User } from '@supabase/supabase-js';
 import { createSupabaseServerClient } from '@/lib/supabase/server';
+import { jsonNoStore } from '@/lib/admin/response';
 
 export function isAdmin(user: User | null | undefined): boolean {
   return user?.app_metadata?.role === 'admin';
@@ -35,13 +36,13 @@ export async function requireAdminApi(): Promise<
   if (!user) {
     return {
       ok: false,
-      response: NextResponse.json({ error: 'unauthorized' }, { status: 401 }),
+      response: jsonNoStore({ error: 'unauthorized' }, { status: 401 }),
     };
   }
   if (!isAdmin(user)) {
     return {
       ok: false,
-      response: NextResponse.json({ error: 'forbidden' }, { status: 403 }),
+      response: jsonNoStore({ error: 'forbidden' }, { status: 403 }),
     };
   }
   return { ok: true, user };
diff --git a/lib/supabase/admin.ts b/lib/supabase/admin.ts
index a93dd72..973cd8e 100644
--- a/lib/supabase/admin.ts
+++ b/lib/supabase/admin.ts
@@ -11,6 +11,13 @@ export function getSupabaseAdmin(): SupabaseClient {
   }
   _admin = createClient(url, key, {
     auth: { autoRefreshToken: false, persistSession: false },
+    global: {
+      // Force every request the admin client makes (GoTrue listUsers and
+      // PostgREST reads alike) to bypass Next's fetch Data Cache, so the admin
+      // surface always reflects current state regardless of page config.
+      fetch: (input: RequestInfo | URL, init?: RequestInit) =>
+        fetch(input, { ...init, cache: 'no-store' }),
+    },
   });
   return _admin;
 }
diff --git a/middleware.ts b/middleware.ts
index f876039..835f36e 100644
--- a/middleware.ts
+++ b/middleware.ts
@@ -31,23 +31,35 @@ export async function middleware(request: NextRequest) {
   // per-route requireAdmin()/requireAdminApi() checks.
   const path = request.nextUrl.pathname;
   if (path.startsWith('/admin') || path.startsWith('/api/admin')) {
+    // Carry any cookies Supabase rotated onto the working `response` over to a
+    // deny/redirect response, so a refreshed session/refresh token is always
+    // persisted — otherwise a fresh NextResponse would drop them and a
+    // concurrent request could spuriously 401.
+    const withCookies = (res: NextResponse): NextResponse => {
+      response.cookies.getAll().forEach((cookie) => res.cookies.set(cookie));
+      return res;
+    };
     if (!user) {
       if (path.startsWith('/api/admin')) {
-        return NextResponse.json({ error: 'unauthorized' }, { status: 401 });
+        return withCookies(
+          NextResponse.json({ error: 'unauthorized' }, { status: 401 }),
+        );
       }
       const url = request.nextUrl.clone();
       url.pathname = '/login';
       url.search = '';
-      return NextResponse.redirect(url);
+      return withCookies(NextResponse.redirect(url));
     }
     if (user.app_metadata?.role !== 'admin') {
       if (path.startsWith('/api/admin')) {
-        return NextResponse.json({ error: 'forbidden' }, { status: 403 });
+        return withCookies(
+          NextResponse.json({ error: 'forbidden' }, { status: 403 }),
+        );
       }
       const url = request.nextUrl.clone();
       url.pathname = '/dashboard';
       url.search = '';
-      return NextResponse.redirect(url);
+      return withCookies(NextResponse.redirect(url));
     }
   }