feat(lifecycle): add billing lifecycle with auto-suspend/delete

- New AppLifecycleService with cron-based scanner (60s interval)
- State machine: ACTIVE → SUSPENDED → PENDING_DELETION → DELETED
- Auto-renew hourly plans from wallet
- Admin-configurable grace periods via PlatformSettings table
- New LifecycleController (GET/PATCH /lifecycle/settings)
- PlatformSetting entity for runtime admin config
- BillingService: calculateCostForApp, deductWallet
- Application entity: planId, billingCycle, lifecycleStatus, planExpiresAt
- New enums: AppLifecycleStatus, BillingCycle

backend/src/app.module.ts

@@ -12,6 +12,7 @@ import { BuildModule } from './build/build.module';
 import { TicketsModule } from './tickets/tickets.module';
 import { BillingModule } from './billing/billing.module';
 import { SnapshotsModule } from './snapshots/snapshots.module';
+import { LifecycleModule } from './lifecycle/lifecycle.module';
 import configuration from './config/configuration';
 
 @Module({
@@ -62,6 +63,7 @@ import configuration from './config/configuration';
     TicketsModule,
     BillingModule,
     SnapshotsModule,
+    LifecycleModule,
   ],
 })
 export class AppModule {}

backend/src/applications/entities/application.entity.ts

@@ -8,7 +8,7 @@ import {
   OneToMany,
   JoinColumn,
 } from 'typeorm';
-import { AppRuntime, DatabaseType } from '../../common/enums';
+import { AppRuntime, DatabaseType, BillingCycle, AppLifecycleStatus } from '../../common/enums';
 import { User } from '../../users/entities/user.entity';
 import { Deployment } from '../../deployments/entities/deployment.entity';
 
@@ -59,6 +59,9 @@ export class Application {
   @Column({ nullable: true })
   codePath: string; // Path to uploaded zip
 
+  @Column({ nullable: true })
+  dbDumpPath: string; // Path to uploaded SQL dump file
+
   @Column({ type: 'jsonb', nullable: true })
   envVars: Record<string, string>;
 
@@ -105,6 +108,25 @@ export class Application {
   @Column({ nullable: true })
   subdomain: string; // <subdomain>.apps.cloudhost.local
 
+  // ── Billing & Lifecycle ─────────────────────────────
+  @Column({ nullable: true })
+  planId: string; // FK to ServicePlan
+
+  @Column({ type: 'enum', enum: BillingCycle, nullable: true })
+  billingCycle: BillingCycle; // The cycle this app was purchased under
+
+  @Column({ type: 'enum', enum: AppLifecycleStatus, default: AppLifecycleStatus.ACTIVE })
+  lifecycleStatus: AppLifecycleStatus;
+
+  @Column({ type: 'timestamptz', nullable: true })
+  planExpiresAt: Date; // When the current billing period ends
+
+  @Column({ type: 'timestamptz', nullable: true })
+  suspendedAt: Date; // When the app was suspended (pods scaled to 0)
+
+  @Column({ type: 'timestamptz', nullable: true })
+  scheduledDeletionAt: Date; // When the app will be permanently deleted
+
   @CreateDateColumn()
   createdAt: Date;
 

backend/src/billing/billing.controller.ts

@@ -9,10 +9,14 @@ import {
   Query,
   UseGuards,
   Request,
+  BadRequestException,
+  Inject,
+  forwardRef,
 } from '@nestjs/common';
 import { AuthGuard } from '@nestjs/passport';
 import { ApiTags, ApiOperation, ApiBearerAuth } from '@nestjs/swagger';
 import { BillingService } from './billing.service';
+import { AppLifecycleService } from '../lifecycle/app-lifecycle.service';
 import {
   CreateServicePlanDto,
   UpdateServicePlanDto,
@@ -21,14 +25,18 @@ import {
 } from './dto/billing.dto';
 import { RolesGuard } from '../common/guards/roles.guard';
 import { Roles } from '../common/decorators/roles.decorator';
-import { UserRole } from '../common/enums';
+import { UserRole, BillingCycle, AppLifecycleStatus } from '../common/enums';
 
 @ApiTags('Billing')
 @ApiBearerAuth()
 @Controller('billing')
 @UseGuards(AuthGuard('jwt'), RolesGuard)
 export class BillingController {
-  constructor(private readonly billingService: BillingService) {}
+  constructor(
+    private readonly billingService: BillingService,
+    @Inject(forwardRef(() => AppLifecycleService))
+    private readonly lifecycleService: AppLifecycleService,
+  ) {}
 
   // ─── Service Plans (Admin) ────────────────────────────────────────
 
@@ -98,18 +106,49 @@ export class BillingController {
   }
 
   @Post('wallet/pay/:applicationId')
-  @ApiOperation({ summary: 'Pay for an application from wallet' })
+  @ApiOperation({ summary: 'Pay for an application plan from wallet — activates/renews the app' })
   async payForApplication(
     @Request() req: any,
     @Param('applicationId') applicationId: string,
-    @Body() body: { amount: number; cycle: string },
+    @Body() body: { planId: string; cycle: string },
   ) {
-    return this.billingService.deductWallet(
+    const cycle = body.cycle as BillingCycle;
+    if (!Object.values(BillingCycle).includes(cycle)) {
+      throw new BadRequestException(`Invalid billing cycle: ${body.cycle}`);
+    }
+
+    // Calculate cost
+    const plan = await this.billingService.findPlan(body.planId);
+    const costs = await this.billingService.calculateCost({
+      runtime: plan.runtime,
+      databaseType: 'none', // Will be refined per-app later
+      cpuLimit: '500m',
+      memoryLimit: '512Mi',
+      replicas: 1,
+    });
+
+    const amount = cycle === BillingCycle.HOURLY ? costs.hourly
+      : cycle === BillingCycle.MONTHLY ? costs.monthly
+      : costs.yearly;
+
+    // Deduct from wallet
+    const tx = await this.billingService.deductWallet(
       req.user.id,
-      body.amount,
+      amount,
-      `Payment for application (${body.cycle})`,
+      `Payment for app ${applicationId} (${cycle}) — plan: ${plan.name}`,
       applicationId,
     );
+
+    // Activate/reactivate the application
+    const app = await this.lifecycleService.activateApp(applicationId, cycle, body.planId);
+
+    return {
+      transaction: tx,
+      application: { id: app.id, name: app.name, lifecycleStatus: app.lifecycleStatus, planExpiresAt: app.planExpiresAt },
+      message: app.lifecycleStatus === AppLifecycleStatus.ACTIVE
+        ? `Application "${app.name}" activated until ${app.planExpiresAt?.toISOString()}`
+        : `Payment processed — application status: ${app.lifecycleStatus}`,
+    };
   }
 
   // ─── Payment Gateway ─────────────────────────────────────────────

backend/src/billing/billing.module.ts

@@ -1,4 +1,4 @@
-import { Module } from '@nestjs/common';
+import { Module, forwardRef } from '@nestjs/common';
 import { TypeOrmModule } from '@nestjs/typeorm';
 import { BillingService } from './billing.service';
 import { BillingController } from './billing.controller';
@@ -6,10 +6,13 @@ import { ServicePlan } from './entities/service-plan.entity';
 import { PricingRule } from './entities/pricing-rule.entity';
 import { Wallet } from './entities/wallet.entity';
 import { WalletTransaction } from './entities/wallet-transaction.entity';
+import { PlatformSetting } from './entities/platform-setting.entity';
+import { LifecycleModule } from '../lifecycle/lifecycle.module';
 
 @Module({
   imports: [
-    TypeOrmModule.forFeature([ServicePlan, PricingRule, Wallet, WalletTransaction]),
+    TypeOrmModule.forFeature([ServicePlan, PricingRule, Wallet, WalletTransaction, PlatformSetting]),
+    forwardRef(() => LifecycleModule),
   ],
   controllers: [BillingController],
   providers: [BillingService],

backend/src/billing/billing.service.ts

@@ -288,4 +288,27 @@ export class BillingService {
   async getAllWallets(): Promise<Wallet[]> {
     return this.walletRepo.find({ relations: ['user'], order: { balance: 'DESC' } });
   }
+
+  /**
+   * Calculate cost for an existing Application entity.
+   * Used by lifecycle service for auto-renew.
+   */
+  async calculateCostForApp(app: {
+    runtime: string;
+    databaseType: string;
+    cpuLimit: string;
+    memoryLimit: string;
+    replicas: number;
+    dbStorageSize?: string;
+  }): Promise<{ hourly: number; monthly: number; yearly: number }> {
+    const result = await this.calculateCost({
+      runtime: app.runtime,
+      databaseType: app.databaseType,
+      cpuLimit: app.cpuLimit,
+      memoryLimit: app.memoryLimit,
+      replicas: app.replicas,
+      dbStorageSize: app.dbStorageSize,
+    });
+    return { hourly: result.hourly, monthly: result.monthly, yearly: result.yearly };
+  }
 }

backend/src/billing/entities/platform-setting.entity.ts

@@ -0,0 +1,32 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+
+/**
+ * Key-value settings table editable by super-admin at runtime.
+ * Used for lifecycle retention periods, feature flags, etc.
+ */
+@Entity('platform_settings')
+export class PlatformSetting {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ unique: true })
+  key: string;
+
+  @Column({ type: 'text' })
+  value: string;
+
+  @Column({ nullable: true })
+  description: string;
+
+  @CreateDateColumn()
+  createdAt: Date;
+
+  @UpdateDateColumn()
+  updatedAt: Date;
+}

backend/src/common/enums.ts

@@ -80,3 +80,12 @@ export enum TransactionType {
   DEDUCTION = 'deduction', // Payment for service
   REFUND = 'refund',       // Refund
 }
+
+// ── Application Lifecycle ─────────────────────────────
+
+export enum AppLifecycleStatus {
+  ACTIVE = 'active',               // Paid & running
+  SUSPENDED = 'suspended',         // Plan expired, pods scaled to 0, data retained
+  PENDING_DELETION = 'pending_deletion', // Grace period — will be deleted if no payment
+  DELETED = 'deleted',             // Fully removed from K8s and DB
+}

backend/src/config/configuration.ts

@@ -23,7 +23,7 @@ export default () => ({
   },
 
   registry: {
-    url: process.env.REGISTRY_URL || 'registry.example.com',
+    url: process.env.REGISTRY_URL || 'registry.cloudhost-builds.svc.cluster.local:5000',
     pullUrl: process.env.REGISTRY_PULL_URL || process.env.REGISTRY_URL || 'localhost:30500',
     username: process.env.REGISTRY_USERNAME || 'admin',
     password: process.env.REGISTRY_PASSWORD || '',
@@ -38,4 +38,23 @@ export default () => ({
     domain: process.env.PLATFORM_DOMAIN || 'apps.cloudhost.local',
     uploadDir: process.env.UPLOAD_DIR || './uploads',
   },
+
+  // Lifecycle defaults (can be overridden via PlatformSettings entity by admin)
+  lifecycle: {
+    // How long after plan expires to suspend the app (scale to 0)
+    hourly: {
+      suspendAfterMs: parseInt(process.env.LIFECYCLE_HOURLY_SUSPEND_MS || String(0), 10),            // immediately on expiry
+      deleteAfterMs: parseInt(process.env.LIFECYCLE_HOURLY_DELETE_MS || String(24 * 3600 * 1000), 10), // 24h after suspend
+    },
+    monthly: {
+      suspendAfterMs: parseInt(process.env.LIFECYCLE_MONTHLY_SUSPEND_MS || String(0), 10),
+      deleteAfterMs: parseInt(process.env.LIFECYCLE_MONTHLY_DELETE_MS || String(3 * 24 * 3600 * 1000), 10), // 3 days
+    },
+    yearly: {
+      suspendAfterMs: parseInt(process.env.LIFECYCLE_YEARLY_SUSPEND_MS || String(0), 10),
+      deleteAfterMs: parseInt(process.env.LIFECYCLE_YEARLY_DELETE_MS || String(7 * 24 * 3600 * 1000), 10), // 7 days
+    },
+    // Cron interval for the lifecycle scanner
+    scanIntervalMs: parseInt(process.env.LIFECYCLE_SCAN_INTERVAL_MS || String(60_000), 10), // 1 min
+  },
 });

backend/src/lifecycle/app-lifecycle.service.ts

@@ -0,0 +1,320 @@
+import { Injectable, Logger, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository, LessThanOrEqual, In } from 'typeorm';
+import { ConfigService } from '@nestjs/config';
+import { Application } from '../applications/entities/application.entity';
+import { PlatformSetting } from '../billing/entities/platform-setting.entity';
+import { KubernetesService } from '../kubernetes/kubernetes.service';
+import { BillingService } from '../billing/billing.service';
+import { AppLifecycleStatus, BillingCycle, DeploymentStatus } from '../common/enums';
+
+/**
+ * Manages the full lifecycle of applications based on their billing plan:
+ *
+ *  ACTIVE  ──(plan expires)──►  SUSPENDED  ──(grace period)──►  PENDING_DELETION ──► DELETED
+ *     ▲                              │                                │
+ *     └──────── payment ─────────────┘                                │
+ *     └──────── payment (if still within grace) ──────────────────────┘
+ *
+ * Runs a periodic scan (configurable interval, default 60s) that:
+ *   1. Finds ACTIVE apps whose planExpiresAt has passed → suspends them
+ *   2. Finds SUSPENDED apps past their grace period → marks PENDING_DELETION
+ *   3. Finds PENDING_DELETION apps past scheduledDeletionAt → fully deletes
+ */
+@Injectable()
+export class AppLifecycleService implements OnModuleInit, OnModuleDestroy {
+  private readonly logger = new Logger(AppLifecycleService.name);
+  private scanTimer: NodeJS.Timeout | null = null;
+
+  constructor(
+    @InjectRepository(Application)
+    private appRepo: Repository<Application>,
+    @InjectRepository(PlatformSetting)
+    private settingsRepo: Repository<PlatformSetting>,
+    private configService: ConfigService,
+    private kubernetesService: KubernetesService,
+    private billingService: BillingService,
+  ) {}
+
+  onModuleInit() {
+    const interval = this.configService.get<number>('lifecycle.scanIntervalMs') || 60_000;
+    this.logger.log(`Lifecycle scanner starting — interval: ${interval / 1000}s`);
+    this.scanTimer = setInterval(() => this.runScan(), interval);
+    // Run once immediately after a short delay to catch up on startup
+    setTimeout(() => this.runScan(), 5_000);
+  }
+
+  onModuleDestroy() {
+    if (this.scanTimer) clearInterval(this.scanTimer);
+  }
+
+  // ─── Public API (called by billing on payment) ────────────────────
+
+  /**
+   * Activate or reactivate an application after successful payment.
+   * Calculates the new expiry based on billing cycle and scales pods back up.
+   */
+  async activateApp(appId: string, billingCycle: BillingCycle, planId: string): Promise<Application> {
+    const app = await this.appRepo.findOne({ where: { id: appId } });
+    if (!app) throw new Error(`Application ${appId} not found`);
+
+    const now = new Date();
+    const expiresAt = this.calculateExpiry(now, billingCycle);
+
+    app.planId = planId;
+    app.billingCycle = billingCycle;
+    app.lifecycleStatus = AppLifecycleStatus.ACTIVE;
+    app.planExpiresAt = expiresAt;
+    app.suspendedAt = null as any;
+    app.scheduledDeletionAt = null as any;
+
+    const saved = await this.appRepo.save(app);
+
+    // If the app was suspended, scale it back up
+    if (app.latestImageTag) {
+      try {
+        await this.kubernetesService.scaleDeployment(app, app.replicas || 1);
+        this.logger.log(`Reactivated ${app.name} — scaled to ${app.replicas} replicas, expires ${expiresAt.toISOString()}`);
+      } catch (e: any) {
+        this.logger.warn(`Failed to scale up ${app.name} on reactivation: ${e.message}`);
+      }
+    }
+
+    return saved;
+  }
+
+  /**
+   * Renew an app for another billing period (used for auto-renew or manual renewal).
+   */
+  async renewApp(appId: string): Promise<Application> {
+    const app = await this.appRepo.findOne({ where: { id: appId } });
+    if (!app || !app.billingCycle) throw new Error('Application not found or has no billing cycle');
+
+    const baseDate = app.planExpiresAt && app.planExpiresAt > new Date()
+      ? app.planExpiresAt  // extend from current expiry
+      : new Date();        // expired — extend from now
+
+    app.planExpiresAt = this.calculateExpiry(baseDate, app.billingCycle);
+    app.lifecycleStatus = AppLifecycleStatus.ACTIVE;
+    app.suspendedAt = null as any;
+    app.scheduledDeletionAt = null as any;
+
+    return this.appRepo.save(app);
+  }
+
+  // ─── Periodic Scanner ─────────────────────────────────────────────
+
+  private async runScan() {
+    try {
+      const now = new Date();
+      await this.suspendExpiredApps(now);
+      await this.markForDeletion(now);
+      await this.deleteExpiredApps(now);
+    } catch (e: any) {
+      this.logger.error(`Lifecycle scan error: ${e.message}`, e.stack);
+    }
+  }
+
+  /**
+   * Step 1: Find ACTIVE apps whose planExpiresAt has passed → SUSPEND
+   */
+  private async suspendExpiredApps(now: Date) {
+    const expiredApps = await this.appRepo.find({
+      where: {
+        lifecycleStatus: AppLifecycleStatus.ACTIVE,
+        planExpiresAt: LessThanOrEqual(now),
+      },
+    });
+
+    for (const app of expiredApps) {
+      if (!app.billingCycle) continue; // No billing plan — skip (free/unmanaged app)
+
+      try {
+        // For hourly plans: try auto-deduct from wallet for renewal
+        if (app.billingCycle === BillingCycle.HOURLY) {
+          const renewed = await this.tryAutoRenew(app);
+          if (renewed) continue;
+        }
+
+        // Suspend: scale to 0
+        try {
+          await this.kubernetesService.scaleDeployment(app, 0);
+        } catch (e: any) {
+          this.logger.warn(`Failed to scale down ${app.name}: ${e.message}`);
+        }
+
+        app.lifecycleStatus = AppLifecycleStatus.SUSPENDED;
+        app.suspendedAt = now;
+
+        // Calculate when deletion should happen
+        const deleteAfterMs = await this.getDeleteGracePeriod(app.billingCycle);
+        app.scheduledDeletionAt = new Date(now.getTime() + deleteAfterMs);
+
+        await this.appRepo.save(app);
+        this.logger.warn(
+          `SUSPENDED ${app.name} (${app.billingCycle} plan expired). ` +
+          `Scheduled deletion: ${app.scheduledDeletionAt.toISOString()}`,
+        );
+      } catch (e: any) {
+        this.logger.error(`Failed to suspend ${app.name}: ${e.message}`);
+      }
+    }
+  }
+
+  /**
+   * Step 2: Find SUSPENDED apps past their scheduledDeletionAt → PENDING_DELETION
+   */
+  private async markForDeletion(now: Date) {
+    const apps = await this.appRepo.find({
+      where: {
+        lifecycleStatus: AppLifecycleStatus.SUSPENDED,
+        scheduledDeletionAt: LessThanOrEqual(now),
+      },
+    });
+
+    for (const app of apps) {
+      app.lifecycleStatus = AppLifecycleStatus.PENDING_DELETION;
+      await this.appRepo.save(app);
+      this.logger.warn(`PENDING_DELETION: ${app.name} — grace period ended, will be deleted`);
+    }
+  }
+
+  /**
+   * Step 3: Find PENDING_DELETION apps → fully delete from K8s and DB
+   */
+  private async deleteExpiredApps(now: Date) {
+    const apps = await this.appRepo.find({
+      where: {
+        lifecycleStatus: AppLifecycleStatus.PENDING_DELETION,
+      },
+    });
+
+    for (const app of apps) {
+      try {
+        // Delete all K8s resources
+        await this.kubernetesService.deleteApplication(app);
+        this.logger.log(`Deleted K8s resources for expired app ${app.name}`);
+      } catch (e: any) {
+        this.logger.warn(`K8s cleanup failed for expired ${app.name}: ${e.message}`);
+      }
+
+      try {
+        // Mark as deleted (soft-delete approach — keep record for audit)
+        app.lifecycleStatus = AppLifecycleStatus.DELETED;
+        await this.appRepo.save(app);
+        this.logger.warn(`DELETED: ${app.name} — all resources removed`);
+      } catch (e: any) {
+        this.logger.error(`Failed to mark ${app.name} as deleted: ${e.message}`);
+      }
+    }
+  }
+
+  // ─── Auto-renew for hourly plans ──────────────────────────────────
+
+  private async tryAutoRenew(app: Application): Promise<boolean> {
+    if (!app.planId) return false;
+
+    try {
+      const cost = await this.billingService.calculateCostForApp(app);
+      const hourlyAmount = cost.hourly;
+      if (hourlyAmount <= 0) return false;
+
+      // Check wallet balance
+      const { balance } = await this.billingService.getBalance(app.userId);
+      if (balance < hourlyAmount) return false;
+
+      // Deduct and renew
+      await this.billingService.deductWallet(
+        app.userId,
+        hourlyAmount,
+        `Auto-renew hourly: ${app.name}`,
+        app.id,
+      );
+
+      app.planExpiresAt = this.calculateExpiry(new Date(), BillingCycle.HOURLY);
+      app.lifecycleStatus = AppLifecycleStatus.ACTIVE;
+      await this.appRepo.save(app);
+
+      this.logger.log(`Auto-renewed hourly plan for ${app.name} — deducted ${hourlyAmount} Toman`);
+      return true;
+    } catch (e: any) {
+      this.logger.warn(`Auto-renew failed for ${app.name}: ${e.message}`);
+      return false;
+    }
+  }
+
+  // ─── Helpers ──────────────────────────────────────────────────────
+
+  private calculateExpiry(from: Date, cycle: BillingCycle): Date {
+    const expiry = new Date(from);
+    switch (cycle) {
+      case BillingCycle.HOURLY:
+        expiry.setHours(expiry.getHours() + 1);
+        break;
+      case BillingCycle.MONTHLY:
+        expiry.setMonth(expiry.getMonth() + 1);
+        break;
+      case BillingCycle.YEARLY:
+        expiry.setFullYear(expiry.getFullYear() + 1);
+        break;
+    }
+    return expiry;
+  }
+
+  /**
+   * Get the grace period (ms) before a suspended app is deleted.
+   * First checks PlatformSettings (admin-editable), then falls back to config file defaults.
+   */
+  private async getDeleteGracePeriod(cycle: BillingCycle): Promise<number> {
+    const settingKey = `lifecycle.${cycle}.deleteAfterMs`;
+
+    // Check admin-editable settings first
+    try {
+      const setting = await this.settingsRepo.findOne({ where: { key: settingKey } });
+      if (setting) return parseInt(setting.value, 10);
+    } catch {}
+
+    // Fall back to config file
+    return this.configService.get<number>(`lifecycle.${cycle}.deleteAfterMs`) || 24 * 3600 * 1000;
+  }
+
+  // ─── Admin API ────────────────────────────────────────────────────
+
+  async getLifecycleSettings(): Promise<Record<string, any>> {
+    const settings = await this.settingsRepo.find({
+      where: { key: In([
+        'lifecycle.hourly.deleteAfterMs',
+        'lifecycle.monthly.deleteAfterMs',
+        'lifecycle.yearly.deleteAfterMs',
+      ]) },
+    });
+
+    const defaults = {
+      'lifecycle.hourly.deleteAfterMs': this.configService.get<number>('lifecycle.hourly.deleteAfterMs'),
+      'lifecycle.monthly.deleteAfterMs': this.configService.get<number>('lifecycle.monthly.deleteAfterMs'),
+      'lifecycle.yearly.deleteAfterMs': this.configService.get<number>('lifecycle.yearly.deleteAfterMs'),
+    };
+
+    const result: Record<string, any> = { ...defaults };
+    for (const s of settings) {
+      result[s.key] = parseInt(s.value, 10);
+    }
+
+    return {
+      hourly: { deleteAfterMs: result['lifecycle.hourly.deleteAfterMs'], deleteAfterHours: result['lifecycle.hourly.deleteAfterMs'] / 3600000 },
+      monthly: { deleteAfterMs: result['lifecycle.monthly.deleteAfterMs'], deleteAfterDays: result['lifecycle.monthly.deleteAfterMs'] / 86400000 },
+      yearly: { deleteAfterMs: result['lifecycle.yearly.deleteAfterMs'], deleteAfterDays: result['lifecycle.yearly.deleteAfterMs'] / 86400000 },
+    };
+  }
+
+  async updateLifecycleSetting(key: string, value: number, description?: string): Promise<PlatformSetting> {
+    let setting = await this.settingsRepo.findOne({ where: { key } });
+    if (setting) {
+      setting.value = String(value);
+      if (description) setting.description = description;
+    } else {
+      setting = this.settingsRepo.create({ key, value: String(value), description });
+    }
+    return this.settingsRepo.save(setting);
+  }
+}

backend/src/lifecycle/lifecycle.controller.ts

@@ -0,0 +1,62 @@
+import {
+  Controller,
+  Get,
+  Patch,
+  Body,
+  UseGuards,
+} from '@nestjs/common';
+import { AuthGuard } from '@nestjs/passport';
+import { ApiTags, ApiOperation, ApiBearerAuth } from '@nestjs/swagger';
+import { RolesGuard } from '../common/guards/roles.guard';
+import { Roles } from '../common/decorators/roles.decorator';
+import { UserRole } from '../common/enums';
+import { AppLifecycleService } from './app-lifecycle.service';
+
+@ApiTags('Lifecycle')
+@ApiBearerAuth()
+@Controller('lifecycle')
+@UseGuards(AuthGuard('jwt'), RolesGuard)
+export class LifecycleController {
+  constructor(private readonly lifecycleService: AppLifecycleService) {}
+
+  @Get('settings')
+  @Roles(UserRole.ADMIN)
+  @ApiOperation({ summary: 'Get lifecycle retention settings (Admin)' })
+  async getSettings() {
+    return this.lifecycleService.getLifecycleSettings();
+  }
+
+  @Patch('settings')
+  @Roles(UserRole.ADMIN)
+  @ApiOperation({ summary: 'Update lifecycle retention settings (Admin)' })
+  async updateSettings(
+    @Body() body: {
+      hourlyDeleteAfterMs?: number;
+      monthlyDeleteAfterMs?: number;
+      yearlyDeleteAfterMs?: number;
+    },
+  ) {
+    const results: Record<string, any> = {};
+
+    if (body.hourlyDeleteAfterMs !== undefined) {
+      results.hourly = await this.lifecycleService.updateLifecycleSetting(
+        'lifecycle.hourly.deleteAfterMs', body.hourlyDeleteAfterMs,
+        'Grace period before deleting hourly apps (ms)',
+      );
+    }
+    if (body.monthlyDeleteAfterMs !== undefined) {
+      results.monthly = await this.lifecycleService.updateLifecycleSetting(
+        'lifecycle.monthly.deleteAfterMs', body.monthlyDeleteAfterMs,
+        'Grace period before deleting monthly apps (ms)',
+      );
+    }
+    if (body.yearlyDeleteAfterMs !== undefined) {
+      results.yearly = await this.lifecycleService.updateLifecycleSetting(
+        'lifecycle.yearly.deleteAfterMs', body.yearlyDeleteAfterMs,
+        'Grace period before deleting yearly apps (ms)',
+      );
+    }
+
+    return { updated: results, current: await this.lifecycleService.getLifecycleSettings() };
+  }
+}

backend/src/lifecycle/lifecycle.module.ts

@@ -0,0 +1,20 @@
+import { Module, forwardRef } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { Application } from '../applications/entities/application.entity';
+import { PlatformSetting } from '../billing/entities/platform-setting.entity';
+import { AppLifecycleService } from './app-lifecycle.service';
+import { LifecycleController } from './lifecycle.controller';
+import { KubernetesModule } from '../kubernetes/kubernetes.module';
+import { BillingModule } from '../billing/billing.module';
+
+@Module({
+  imports: [
+    TypeOrmModule.forFeature([Application, PlatformSetting]),
+    KubernetesModule,
+    forwardRef(() => BillingModule),
+  ],
+  controllers: [LifecycleController],
+  providers: [AppLifecycleService],
+  exports: [AppLifecycleService],
+})
+export class LifecycleModule {}