Add prepaid resource credits with prorated deploy billing.

When users delete an app before plan expiry, remaining resources become credits for a new deploy. The deploy calculator shows covered vs additional charges, prices optional services correctly, and prorates extras to days left on the credit.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/app/dashboard/apps/[id]/page.tsx

@@ -566,9 +566,14 @@ export default function AppDetailPage() {
 
   const deleteMutation = useMutation({
     mutationFn: () => api.delete(`/applications/${appId}`),
-    onSuccess: () => {
+    onSuccess: (res) => {
       queryClient.invalidateQueries({ queryKey: ['applications'] });
-      toast.success('Application deleted');
+      queryClient.invalidateQueries({ queryKey: ['resource-credits'] });
+      if (res.data?.resourceCredit) {
+        toast.success('Application deleted. Prepaid resources are on your dashboard.');
+      } else {
+        toast.success('Application deleted');
+      }
       router.push('/dashboard/apps');
     },
     onError: () => toast.error('Failed to delete application'),
@@ -862,7 +867,11 @@ export default function AppDetailPage() {
   const handleDelete = async () => {
     const ok = await confirm({
       title: `Delete "${app.name}"?`,
-      message: 'This will permanently remove:\n• All Kubernetes resources (pods, services, ingress)\n• Database and volumes\n• All deployment records\n• Uploaded source code',
+      message:
+        'This will permanently remove all Kubernetes resources, data, and deployment records.\n\n' +
+        (app.planExpiresAt && new Date(app.planExpiresAt) > new Date()
+          ? 'Your remaining paid resources will appear on the dashboard for use on a new app at no extra charge.'
+          : ''),
       confirmText: 'Delete',
       variant: 'danger',
     });
@@ -937,11 +946,12 @@ export default function AppDetailPage() {
             </>
           )}
           <button onClick={handleDelete} disabled={deleteMutation.isPending} className="btn-danger text-sm disabled:opacity-50">
-                  {deleteMutation.isPending ? <><Clock className="w-3 h-3 inline animate-spin" /></> : 'Delete'}
+            {deleteMutation.isPending ? <><Clock className="w-3 h-3 inline animate-spin" /></> : 'Delete'}
           </button>
         </div>
       </div>
 
+
       {/* Renewal Banner for Expired/Suspended Apps */}
       {needsRenewal && (
         <div className={`rounded-xl p-4 border-2 ${

frontend/src/app/dashboard/apps/page.tsx

@@ -4,7 +4,7 @@ import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import Link from 'next/link';
 import api from '@/lib/api';
 import { toast } from 'react-toastify';
-import type { Application, AppLifecycleStatus } from '@/types';
+import type { Application } from '@/types';
 import { Rocket, Package, Hexagon, Database, Box, AlertTriangle, Clock } from 'lucide-react';
 import { useConfirm } from '@/components/confirm-modal';
 
@@ -57,9 +57,14 @@ export default function AppsPage() {
 
   const deleteMutation = useMutation({
     mutationFn: (id: string) => api.delete(`/applications/${id}`),
-    onSuccess: () => {
+    onSuccess: (res) => {
       queryClient.invalidateQueries({ queryKey: ['applications'] });
-      toast.success('Application deleted');
+      queryClient.invalidateQueries({ queryKey: ['resource-credits'] });
+      if (res.data?.resourceCredit) {
+        toast.success('Application deleted. Your prepaid resources are shown on the dashboard.');
+      } else {
+        toast.success('Application deleted');
+      }
     },
     onError: () => toast.error('Failed to delete application'),
   });
@@ -110,7 +115,6 @@ export default function AppsPage() {
         </div>
       ) : (
         <>
-          {/* Desktop Table */}
           <div className="hidden md:block table-wrapper">
             <table className="min-w-full divide-y divide-gray-200">
               <thead className="bg-gray-50/80">
@@ -129,22 +133,21 @@ export default function AppsPage() {
                   const lifecycle = app.lifecycleStatus || 'active';
                   const expiry = formatExpiry(app.planExpiresAt);
                   return (
-                    <tr key={app.id} className={`hover:bg-gray-50/50 transition-colors ${lifecycle === 'suspended' ? 'bg-amber-50/30' : lifecycle === 'pending_deletion' ? 'bg-red-50/30' : ''}`}>
+                    <tr
+                      key={app.id}
+                      className={`hover:bg-gray-50/50 transition-colors ${lifecycle === 'suspended' ? 'bg-amber-50/30' : lifecycle === 'pending_deletion' ? 'bg-red-50/30' : ''}`}
+                    >
                       <td className="px-6 py-4">
                         <Link href={`/dashboard/apps/${app.id}`} className="flex items-center gap-3 group">
                           <div className="w-9 h-9 rounded-lg bg-primary-50 flex items-center justify-center shrink-0">
                             <Hexagon className={`w-5 h-5 ${app.runtime === 'nodejs' ? 'text-green-600' : app.runtime === 'wordpress' ? 'text-blue-600' : 'text-orange-500'}`} />
                           </div>
-                          <span className="font-semibold text-gray-900 group-hover:text-primary-600 transition-colors">
-                            {app.name}
-                          </span>
+                          <span className="font-semibold text-gray-900 group-hover:text-primary-600 transition-colors">{app.name}</span>
                         </Link>
                       </td>
                       <td className="px-6 py-4 text-sm text-gray-600 capitalize">{app.runtime}</td>
                       <td className="px-6 py-4">
-                        <span className={`badge ${statusColors[latestStatus] || 'badge-gray'}`}>
-                          {latestStatus}
-                        </span>
+                        <span className={`badge ${statusColors[latestStatus] || 'badge-gray'}`}>{latestStatus}</span>
                       </td>
                       <td className="px-6 py-4">
                         <span className={`inline-flex items-center gap-1 px-2 py-1 rounded-full text-xs font-semibold ${lifecycleColors[lifecycle] || 'text-gray-500 bg-gray-100'}`}>
@@ -168,8 +171,14 @@ export default function AppsPage() {
                             View
                           </Link>
                           <button
+                            type="button"
                             onClick={async () => {
-                              const ok = await confirm({ title: 'Delete Application', message: `Are you sure you want to delete "${app.name}"?`, confirmText: 'Delete', variant: 'danger' });
+                              const ok = await confirm({
+                                title: 'Delete Application',
+                                message: `Permanently delete "${app.name}" and all its data?\n\nIf your plan still has time left, the prepaid resources will appear on your dashboard for use on a new app at no extra charge.`,
+                                confirmText: 'Delete',
+                                variant: 'danger',
+                              });
                               if (ok) deleteMutation.mutate(app.id);
                             }}
                             className="text-xs px-3 py-1.5 rounded-lg text-red-600 hover:bg-red-50 transition-colors"
@@ -185,7 +194,6 @@ export default function AppsPage() {
             </table>
           </div>
 
-          {/* Mobile Cards */}
           <div className="md:hidden grid gap-3">
             {apps.map((app) => {
               const latestStatus = app.deployments?.[0]?.status || 'pending';
@@ -207,11 +215,8 @@ export default function AppsPage() {
                         <p className="text-xs text-gray-500 capitalize">{app.runtime}</p>
                       </div>
                     </div>
-                    <span className={`badge ${statusColors[latestStatus] || 'badge-gray'}`}>
-                      {latestStatus}
-                    </span>
+                    <span className={`badge ${statusColors[latestStatus] || 'badge-gray'}`}>{latestStatus}</span>
                   </div>
-                  {/* Lifecycle & Expiry row */}
                   <div className="flex items-center gap-3 mb-2">
                     <span className={`inline-flex items-center gap-1 px-2 py-0.5 rounded-full text-xs font-semibold ${lifecycleColors[lifecycle] || 'text-gray-500 bg-gray-100'}`}>
                       {lifecycle === 'suspended' && <AlertTriangle className="w-3 h-3" />}
@@ -225,8 +230,12 @@ export default function AppsPage() {
                     )}
                   </div>
                   <div className="flex items-center gap-4 text-xs text-gray-500">
-                    <span className="flex items-center gap-1"><Database className="w-3 h-3" /> {app.databaseType}</span>
-                    <span className="flex items-center gap-1"><Box className="w-3 h-3" /> {app.replicas} replica{app.replicas > 1 ? 's' : ''}</span>
+                    <span className="flex items-center gap-1">
+                      <Database className="w-3 h-3" /> {app.databaseType}
+                    </span>
+                    <span className="flex items-center gap-1">
+                      <Box className="w-3 h-3" /> {app.replicas} replica{app.replicas > 1 ? 's' : ''}
+                    </span>
                   </div>
                 </Link>
               );

frontend/src/app/dashboard/deploy/page.tsx

@@ -7,7 +7,7 @@ import api from '@/lib/api';
 import { parseDotenv } from '@/lib/parseDotenv';
 import { useAuthStore } from '@/lib/store';
 import { toast } from 'react-toastify';
-import type { CreateApplicationDto, ClusterPublic, ClusterPoolPublic, CostBreakdown, BillingCycle } from '@/types';
+import type { CreateApplicationDto, ClusterPublic, ClusterPoolPublic, DeployCostPreview, BillingCycle } from '@/types';
 import { Hexagon, FolderUp, Link as LinkIcon, CheckCircle, Package, Server, Scale, Home, Target, BarChart3, RotateCw, KeyRound, Rocket, Clock, Upload, XCircle, Database, Eye, EyeOff, RefreshCw, DollarSign, Wallet, CreditCard, Loader2, Globe, Copy, AlertCircle, ShieldCheck } from 'lucide-react';
 
 const steps = ['Basic Info', 'Versions & Database', 'Resources', 'Review'];
@@ -123,22 +123,25 @@ export default function DeployPage() {
     },
   });
 
-  // Cost calculation for the review step
-  const { data: costData, isLoading: costLoading } = useQuery<CostBreakdown>({
-    queryKey: ['deploy-cost', form.runtime, form.databaseType, form.cpuLimit, form.memoryLimit, form.replicas, form.dbStorageSize, form.appStorageSize, form.enableRedis, form.enableRabbitmq, form.enableElasticsearch, enableCustomDomain],
-    queryFn: () => api.post('/billing/calculate', {
-      runtime: form.runtime,
-      databaseType: form.databaseType,
-      cpuLimit: form.cpuLimit,
-      memoryLimit: form.memoryLimit,
-      replicas: form.replicas,
-      dbStorageSize: form.databaseType !== 'none' ? `${parseInt(form.dbStorageSize || '1', 10) || 1}` : undefined,
-      appStorageSize: `${parseInt(form.appStorageSize || '2', 10) || 2}`,
-      enableRedis: form.enableRedis,
-      enableRabbitmq: form.enableRabbitmq,
-      enableElasticsearch: form.enableElasticsearch,
-      enableCustomDomain,
-    }).then((r) => r.data),
+  const deployCostPayload = {
+    runtime: form.runtime,
+    databaseType: form.databaseType,
+    cpuLimit: form.cpuLimit,
+    memoryLimit: form.memoryLimit,
+    replicas: form.replicas,
+    dbStorageSize: form.databaseType !== 'none' ? `${parseInt(form.dbStorageSize || '1', 10) || 1}Gi` : undefined,
+    appStorageSize: `${parseInt(form.appStorageSize || '2', 10) || 2}Gi`,
+    enableRedis: form.enableRedis,
+    enableRabbitmq: form.enableRabbitmq,
+    enableElasticsearch: form.enableElasticsearch,
+    enableCustomDomain,
+    cycle: selectedCycle,
+  };
+
+  // Cost calculation for the review step (includes prepaid resource credits)
+  const { data: costData, isLoading: costLoading } = useQuery<DeployCostPreview>({
+    queryKey: ['deploy-cost', deployCostPayload],
+    queryFn: () => api.post('/billing/calculate-deploy', deployCostPayload).then((r) => r.data),
     enabled: step === 3,
   });
 
@@ -149,9 +152,14 @@ export default function DeployPage() {
     enabled: step === 3,
   });
 
-  const payAmount = costData ? costData[selectedCycle] : 0;
+  const payAmount = costData?.amountDue ?? 0;
+  const fullPrice = costData?.fullAmount ?? 0;
+  const coveredAmount = costData?.coveredAmount ?? 0;
+  const extrasBreakdown = costData?.extrasBreakdown ?? [];
+  const prepaidCreditUsed = costData?.prepaidCreditUsed ?? false;
   const walletBalance = walletData?.balance ?? 0;
-  const hasEnoughBalance = walletBalance >= payAmount;
+  const hasEnoughBalance = payAmount === 0 || walletBalance >= payAmount;
+  const requiresPayment = (costData?.monthly ?? 0) > 0 && payAmount > 0;
 
   const walletPayMutation = useMutation({
     mutationFn: async () => {
@@ -218,18 +226,20 @@ export default function DeployPage() {
     mutationFn: async () => {
       // Initiate gateway
       setDeployStage('paying');
-      const { data: gw } = await api.post('/billing/gateway/initiate', {
-        amount: payAmount,
-        description: `Deploy: ${form.name} (${selectedCycle})`,
-        callbackUrl: `${window.location.origin}/dashboard/deploy`,
-      });
+      if (payAmount > 0) {
+        const { data: gw } = await api.post('/billing/gateway/initiate', {
+          amount: payAmount,
+          description: `Deploy: ${form.name} (${selectedCycle})`,
+          callbackUrl: `${window.location.origin}/dashboard/deploy`,
+        });
 
-      // In production, redirect to gw.gatewayUrl
-      // For now, auto-verify (simulated)
-      await api.post('/billing/gateway/verify', {
-        trackingCode: gw.trackingCode,
-        amount: payAmount,
-      });
+        // In production, redirect to gw.gatewayUrl
+        // For now, auto-verify (simulated)
+        await api.post('/billing/gateway/verify', {
+          trackingCode: gw.trackingCode,
+          amount: payAmount,
+        });
+      }
 
       // Now create the app
       setDeployStage('creating');
@@ -2227,6 +2237,18 @@ export default function DeployPage() {
                 <div className="text-sm text-gray-400 text-center py-3">Calculating...</div>
               ) : costData && costData.monthly > 0 ? (
                 <div className="space-y-3">
+                  {prepaidCreditUsed && costData.creditApplied && (
+                    <div className="rounded-lg border border-indigo-200 bg-indigo-50 px-3 py-2 text-sm text-indigo-900">
+                      <p className="font-medium">Prepaid credit applied</p>
+                      <p className="text-indigo-700 mt-0.5">
+                        Resources from &quot;{costData.creditApplied.sourceAppName || 'deleted app'}&quot; are covered
+                        until {costData.creditApplied.remainingLabel} remaining.
+                        {payAmount > 0
+                          ? ` You only pay for new add-ons below (prorated to ${costData.prorateRemainingDays ?? '?'}/${costData.proratePeriodDays ?? '?'} days left on your credit).`
+                          : ' No charge for this deploy.'}
+                      </p>
+                    </div>
+                  )}
                   {/* Billing cycle selector */}
                   <div className="grid grid-cols-3 gap-2">
                     {(['hourly', 'monthly', 'yearly'] as BillingCycle[]).map((cycle) => (
@@ -2244,14 +2266,67 @@ export default function DeployPage() {
                           {cycle === 'hourly' ? 'Hourly' : cycle === 'monthly' ? 'Monthly' : 'Yearly'}
                         </p>
                         <p className="text-lg font-bold text-emerald-700">
-                          {Number(costData[cycle]).toLocaleString('en-US')}
+                          {prepaidCreditUsed && cycle === selectedCycle && fullPrice > payAmount ? (
+                            <>
+                              <span className="block text-xs font-normal text-gray-400 line-through">
+                                {Number(costData[cycle]).toLocaleString('en-US')}
+                              </span>
+                              {Number(payAmount).toLocaleString('en-US')}
+                            </>
+                          ) : (
+                            Number(costData[cycle]).toLocaleString('en-US')
+                          )}
                         </p>
                         <p className="text-xs text-gray-400">Toman</p>
                       </button>
                     ))}
                   </div>
 
-                  {costData.breakdown && costData.breakdown.length > 0 && (
+                  {prepaidCreditUsed && (
+                    <div className="mt-2 pt-3 border-t border-emerald-200/50 space-y-2">
+                      <p className="text-xs font-medium text-gray-500">Prepaid credit pricing</p>
+                      <div className="flex justify-between text-xs py-1">
+                        <span className="text-gray-600">Full plan price ({selectedCycle})</span>
+                        <span className="text-gray-900 font-medium">
+                          {Number(fullPrice).toLocaleString('en-US')} T
+                        </span>
+                      </div>
+                      <div className="flex justify-between text-xs py-1 text-indigo-700">
+                        <span>Covered by prepaid credit</span>
+                        <span className="font-medium">
+                          −{Number(coveredAmount).toLocaleString('en-US')} T
+                        </span>
+                      </div>
+                      {extrasBreakdown.length > 0 ? (
+                        <>
+                          <p className="text-xs font-medium text-amber-700 pt-1">Additional charges (you pay)</p>
+                          {extrasBreakdown.map((item, i) => (
+                            <div key={i} className="flex justify-between text-xs py-1 gap-2">
+                              <span className="text-gray-600">{item.label}</span>
+                              <span className="text-amber-800 font-medium text-right shrink-0">
+                                {item.fullPeriodAmount != null && item.fullPeriodAmount > item.amount && (
+                                  <span className="text-gray-400 line-through block text-[10px]">
+                                    {Number(item.fullPeriodAmount).toLocaleString('en-US')} T full period
+                                  </span>
+                                )}
+                                +{Number(item.amount).toLocaleString('en-US')} T
+                              </span>
+                            </div>
+                          ))}
+                        </>
+                      ) : (
+                        <p className="text-xs text-emerald-700">No additional charges — fully covered.</p>
+                      )}
+                      <div className="flex justify-between text-sm py-2 border-t border-emerald-200/50 font-semibold">
+                        <span className="text-gray-800">Amount due ({selectedCycle})</span>
+                        <span className="text-emerald-800">
+                          {Number(payAmount).toLocaleString('en-US')} Toman
+                        </span>
+                      </div>
+                    </div>
+                  )}
+
+                  {!prepaidCreditUsed && costData.breakdown && costData.breakdown.length > 0 && (
                     <div className="mt-2 pt-3 border-t border-emerald-200/50">
                       <p className="text-xs font-medium text-gray-500 mb-2">Breakdown</p>
                       {costData.breakdown.map((item, i) => (
@@ -2262,6 +2337,12 @@ export default function DeployPage() {
                           </span>
                         </div>
                       ))}
+                      <div className="flex justify-between text-sm py-2 border-t border-emerald-200/50 mt-1 font-semibold">
+                        <span className="text-gray-800">Amount due ({selectedCycle})</span>
+                        <span className="text-emerald-800">
+                          {Number(payAmount).toLocaleString('en-US')} Toman
+                        </span>
+                      </div>
                     </div>
                   )}
                 </div>
@@ -2271,7 +2352,12 @@ export default function DeployPage() {
             </div>
 
             {/* Payment Method */}
-            {costData && costData.monthly > 0 && (
+            {costData && costData.monthly > 0 && !requiresPayment && (
+              <div className="rounded-xl border border-emerald-200 bg-emerald-50 p-4 text-sm text-emerald-800">
+                No payment required — your prepaid resource credit covers this deployment.
+              </div>
+            )}
+            {requiresPayment && (
               <div className="bg-white rounded-xl p-5 border border-gray-200">
                 <h3 className="text-sm font-semibold text-gray-700 mb-3">Payment Method</h3>
                 <div className="grid grid-cols-2 gap-3">
@@ -2286,7 +2372,9 @@ export default function DeployPage() {
                     <p className="mt-2 font-semibold text-sm text-gray-900">Pay from Wallet</p>
                     <p className="text-xs text-gray-500 mt-1">
                       Balance: {Number(walletBalance).toLocaleString('en-US')} T
-                      {!hasEnoughBalance && <span className="text-red-500 block mt-0.5">Insufficient balance</span>}
+                      {requiresPayment && !hasEnoughBalance && (
+                        <span className="text-red-500 block mt-0.5">Insufficient balance</span>
+                      )}
                     </p>
                   </button>
                   <button
@@ -2304,7 +2392,14 @@ export default function DeployPage() {
 
                 <div className="mt-4 p-3 bg-gray-50 rounded-lg flex items-center justify-between">
                   <span className="text-sm text-gray-600">Amount to pay ({selectedCycle})</span>
-                  <span className="text-lg font-bold text-gray-900">{Number(payAmount).toLocaleString('en-US')} Toman</span>
+                  <div className="text-right">
+                    {prepaidCreditUsed && fullPrice > payAmount && (
+                      <span className="block text-sm text-gray-400 line-through">
+                        {Number(fullPrice).toLocaleString('en-US')} Toman
+                      </span>
+                    )}
+                    <span className="text-lg font-bold text-gray-900">{Number(payAmount).toLocaleString('en-US')} Toman</span>
+                  </div>
                 </div>
               </div>
             )}
@@ -2337,6 +2432,8 @@ export default function DeployPage() {
                 if (!costData || costData.monthly === 0) {
                   // No pricing — deploy directly
                   handleSubmit();
+                } else if (payAmount === 0) {
+                  walletPayMutation.mutate();
                 } else if (paymentMethod === 'wallet') {
                   if (!hasEnoughBalance) {
                     toast.error('Insufficient wallet balance. Please top up or use payment gateway.');
@@ -2355,7 +2452,9 @@ export default function DeployPage() {
                   ? `Uploading... ${uploadProgress}%`
                   : 'Processing...'
                 : costData && costData.monthly > 0
-                  ? <><CreditCard className="w-4 h-4 inline" /> Pay & Deploy</>
+                  ? payAmount === 0
+                    ? <><Rocket className="w-4 h-4 inline" /> Deploy with prepaid credit</>
+                    : <><CreditCard className="w-4 h-4 inline" /> Pay & Deploy</>
                   : <><Rocket className="w-4 h-4 inline" /> Deploy Application</>}
             </button>
           )}

frontend/src/app/dashboard/page.tsx

@@ -6,7 +6,8 @@ import type { ReactNode } from 'react';
 import api from '@/lib/api';
 import { useAuthStore } from '@/lib/store';
 import type { Application } from '@/types';
-import { Rocket, Package, Circle, Hexagon } from 'lucide-react';
+import { Rocket, Package, Circle, Hexagon, Wallet, Clock } from 'lucide-react';
+import type { ResourceCredit } from '@/types';
 
 const statusColors: Record<string, string> = {
   running: 'bg-emerald-100 text-emerald-700',
@@ -36,6 +37,11 @@ export default function DashboardPage() {
     queryFn: () => api.get('/applications').then((r) => r.data),
   });
 
+  const { data: resourceCredits = [] } = useQuery<ResourceCredit[]>({
+    queryKey: ['resource-credits'],
+    queryFn: () => api.get('/billing/resource-credits').then((r) => r.data),
+  });
+
   const runningApps = apps.filter(
     (a) => a.deployments?.some((d) => d.status === 'running'),
   );
@@ -55,6 +61,47 @@ export default function DashboardPage() {
         </p>
       </div>
 
+      {resourceCredits.length > 0 && (
+        <div className="card border-2 border-indigo-100 bg-indigo-50/40 space-y-4">
+          <div className="flex items-start gap-3">
+            <Wallet className="w-5 h-5 text-indigo-600 shrink-0 mt-0.5" />
+            <div>
+              <h2 className="font-semibold text-indigo-900">Prepaid resource credits</h2>
+              <p className="text-sm text-indigo-700 mt-1">
+                If you delete an app before your plan ends, you can deploy a new app with the same resources at no extra charge until the credit expires.
+              </p>
+            </div>
+          </div>
+          <div className="grid gap-3 sm:grid-cols-2">
+            {resourceCredits.map((credit) => (
+              <div key={credit.id} className="rounded-xl border border-indigo-200 bg-white p-4 text-sm">
+                <p className="font-semibold text-gray-900">
+                  {credit.sourceAppName ? `From app “${credit.sourceAppName}”` : 'Resource credit'}
+                </p>
+                <p className="mt-2 inline-flex items-center gap-1 text-indigo-700 font-medium">
+                  <Clock className="w-3.5 h-3.5" />
+                  {credit.remainingLabel} remaining
+                </p>
+                <ul className="mt-3 grid grid-cols-2 gap-x-3 gap-y-1 text-xs text-gray-600">
+                  <li>CPU: {credit.cpuLimit}</li>
+                  <li>RAM: {credit.memoryLimit}</li>
+                  <li>Replicas: {credit.replicas}</li>
+                  <li>DB: {credit.databaseType}</li>
+                  <li>DB disk: {credit.dbStorageSize}</li>
+                  <li>App disk: {credit.appStorageSize}</li>
+                  {credit.enableRedis && <li>Redis</li>}
+                  {credit.enableRabbitmq && <li>RabbitMQ</li>}
+                  {credit.enableElasticsearch && <li>Elasticsearch</li>}
+                </ul>
+                <Link href="/dashboard/deploy" className="mt-3 inline-block text-xs font-medium text-primary-600 hover:underline">
+                  Use on new app →
+                </Link>
+              </div>
+            ))}
+          </div>
+        </div>
+      )}
+
       {/* Stats */}
       <div className="grid grid-cols-2 lg:grid-cols-4 gap-4">
         <div className="stat-card">

frontend/src/types/index.ts

@@ -144,6 +144,25 @@ export type DeploymentStatus =
 
 export type AppLifecycleStatus = 'active' | 'suspended' | 'pending_deletion' | 'deleted';
 
+export interface ResourceCredit {
+  id: string;
+  sourceAppName?: string;
+  runtime: string;
+  databaseType: string;
+  cpuLimit: string;
+  memoryLimit: string;
+  replicas: number;
+  dbStorageSize?: string;
+  appStorageSize?: string;
+  enableRedis: boolean;
+  enableRabbitmq: boolean;
+  enableElasticsearch: boolean;
+  billingCycle?: string;
+  expiresAt: string;
+  remainingMs: number;
+  remainingLabel: string;
+}
+
 export interface Cluster {
   id: string;
   name: string;
@@ -399,6 +418,25 @@ export interface CostBreakdown {
   breakdown: { label: string; hourly: number; monthly: number; yearly: number }[];
 }
 
+export interface DeployExtraChargeLine {
+  label: string;
+  amount: number;
+  fullPeriodAmount?: number;
+}
+
+export interface DeployCostPreview extends CostBreakdown {
+  cycle: BillingCycle;
+  fullAmount: number;
+  amountDue: number;
+  coveredAmount: number;
+  waivedAmount: number;
+  extrasBreakdown: DeployExtraChargeLine[];
+  creditApplied: ResourceCredit | null;
+  prepaidCreditUsed: boolean;
+  prorateRemainingDays?: number;
+  proratePeriodDays?: number;
+}
+
 // ─── Snapshot / Rollback types ──────────────────────
 
 export type SnapshotType = 'pre_deploy' | 'manual';