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>

backend/src/applications/applications.controller.ts

@@ -29,6 +29,8 @@ import { KubernetesService } from '../kubernetes/kubernetes.service';
 import { DeploymentsService } from '../deployments/deployments.service';
 import { AccessService } from '../access/access.service';
 import { CreateServiceAccessDto } from '../access/dto/service-access.dto';
+import { SnapshotsService } from '../snapshots/snapshots.service';
+import { BillingService } from '../billing/billing.service';
 
 @ApiTags('Applications')
 @ApiBearerAuth()
@@ -44,6 +46,10 @@ export class ApplicationsController {
     @Inject(forwardRef(() => DeploymentsService))
     private readonly deploymentsService: DeploymentsService,
     private readonly accessService: AccessService,
+    @Inject(forwardRef(() => SnapshotsService))
+    private readonly snapshotsService: SnapshotsService,
+    @Inject(forwardRef(() => BillingService))
+    private readonly billingService: BillingService,
   ) {}
 
   private isStaff(role: string): boolean {
@@ -384,20 +390,19 @@ export class ApplicationsController {
   }
 
   @Delete(':id')
-  @ApiOperation({ summary: 'Delete an application and all its resources' })
+  @ApiOperation({ summary: 'Permanently delete an application and all its resources' })
   async delete(@Param('id') id: string, @Request() req: any) {
     const isStaff = req.user.role === UserRole.ADMIN || req.user.role === UserRole.TECHNICAL;
-    // 1. Get the app first
     const app = await this.applicationsService.findOne(id, isStaff ? undefined : req.user.id);
 
-    // 2. Revoke temporary access grants
+    const credit = await this.billingService.createCreditFromDeletedApp(app);
+
     try {
       await this.accessService.revokeAllForApplication(app.id);
     } catch (e: any) {
       this.logger.warn(`Access grant cleanup failed for ${app.name}: ${e.message}`);
     }
 
-    // 3. Delete K8s resources (deployment, service, ingress, db, secrets, PVCs)
     try {
       await this.kubernetesService.deleteApplication(app);
       this.logger.log(`Deleted K8s resources for ${app.name}`);
@@ -405,16 +410,23 @@ export class ApplicationsController {
       this.logger.warn(`K8s cleanup failed for ${app.name}: ${e.message}`);
     }
 
-    // 4. Delete deployment records from DB
     try {
       await this.deploymentsService.deleteAllForApplication(app.id);
     } catch (e: any) {
       this.logger.warn(`Deployment records cleanup failed for ${app.name}: ${e.message}`);
     }
 
-    // 5. Delete app (also deletes uploaded files)
+    try {
+      await this.snapshotsService.deleteAllForApplication(app.id);
+    } catch (e: any) {
+      this.logger.warn(`Snapshot cleanup failed for ${app.name}: ${e.message}`);
+    }
+
     await this.applicationsService.delete(id, isStaff ? app.userId : req.user.id);
 
-    return { message: `Application "${app.name}" and all resources deleted` };
+    return {
+      message: `Application "${app.name}" and all resources deleted`,
+      resourceCredit: credit ? this.billingService.formatCreditForApi(credit) : null,
+    };
   }
 }