# GoodGo Platform Admin Module & Audit Logging Exploration

## Overview
This document provides a comprehensive analysis of the GoodGo Platform codebase for implementing audit logging in the admin module. The exploration covers the admin module structure, existing patterns, DDD implementation, and event infrastructure.

---

## 1. ADMIN MODULE STRUCTURE

### Directory Layout
```
apps/api/src/modules/admin/
├── admin.module.ts                              # Module bootstrap & DI configuration
├── index.ts                                     # Public exports
│
├── domain/                                      # DDD Domain Layer
│   ├── events/                                  # Domain events published by commands
│   │   ├── kyc-approved.event.ts
│   │   ├── kyc-rejected.event.ts
│   │   ├── listing-approved.event.ts
│   │   ├── listing-rejected.event.ts
│   │   ├── subscription-adjusted.event.ts
│   │   ├── user-banned.event.ts
│   │   ├── user-unbanned.event.ts
│   │   └── index.ts
│   ├── repositories/
│   │   ├── admin-query.repository.ts           # Query repository interface (read models)
│   │   └── index.ts
│   ├── __tests__/
│   │   └── admin-events.spec.ts
│   └── index.ts
│
├── application/                                 # CQRS Application Layer
│   ├── commands/                               # Command handlers (mutations)
│   │   ├── adjust-subscription/
│   │   │   ├── adjust-subscription.command.ts
│   │   │   └── adjust-subscription.handler.ts
│   │   ├── approve-kyc/
│   │   ├── approve-listing/
│   │   ├── ban-user/
│   │   ├── bulk-moderate-listings/
│   │   ├── reject-kyc/
│   │   ├── reject-listing/
│   │   ├── update-user-status/
│   │   ├── __tests__/                         # Each handler has spec
│   │   └── index.ts
│   │
│   ├── queries/                                # Query handlers (read models)
│   │   ├── get-dashboard-stats/
│   │   ├── get-kyc-queue/
│   │   ├── get-moderation-queue/
│   │   ├── get-revenue-stats/
│   │   ├── get-user-detail/
│   │   ├── get-users/
│   │   ├── __tests__/
│   │   └── index.ts
│   │
│   ├── listeners/                              # Event subscribers (side effects)
│   │   ├── user-banned.listener.ts            # Deactivates listings, sends notification
│   │   ├── user-deactivated.listener.ts
│   │   └── (called via @OnEvent decorator)
│   │
│   ├── __tests__/                             # Integration tests for handlers
│   │   └── *.spec.ts files
│   │
│   └── index.ts
│
├── infrastructure/                             # Data Access Layer
│   ├── repositories/
│   │   ├── prisma-admin-query.repository.ts   # Prisma implementation
│   │   ├── admin-stats.queries.ts             # Raw SQL/Prisma queries
│   │   ├── admin-user.queries.ts              # Raw SQL/Prisma queries
│   │   └── index.ts
│   └── index.ts
│
└── presentation/                               # HTTP Layer
    ├── controllers/
    │   ├── admin.controller.ts                # User management, subscriptions, dashboard
    │   ├── admin-moderation.controller.ts     # Moderation, KYC
    │   └── index.ts
    │
    ├── dto/                                   # Data Transfer Objects
    │   ├── adjust-subscription.dto.ts
    │   ├── approve-kyc.dto.ts
    │   ├── approve-listing.dto.ts
    │   ├── ban-user.dto.ts
    │   ├── bulk-moderate.dto.ts
    │   ├── get-users-query.dto.ts
    │   ├── reject-kyc.dto.ts
    │   ├── reject-listing.dto.ts
    │   ├── revenue-stats.dto.ts
    │   ├── update-user-status.dto.ts
    │   └── index.ts
    │
    └── index.ts
```

---

## 2. PRISMA SCHEMA ANALYSIS

### Current State
- **Database**: PostgreSQL 16 + PostGIS
- **Schema Location**: `prisma/schema.prisma`
- **Lines**: 602 lines total

### User Model (Relevant to Audit)
```typescript
model User {
  id           String    @id @default(cuid())
  email        String?   @unique
  phone        String    @unique
  passwordHash String?
  fullName     String
  avatarUrl    String?
  role         UserRole  @default(BUYER)  // BUYER, SELLER, AGENT, ADMIN
  kycStatus    KYCStatus @default(NONE)   // NONE, PENDING, VERIFIED, REJECTED
  kycData      Json?
  isActive     Boolean   @default(true)   // Ban flag
  deletedAt    DateTime?
  deletionScheduledAt DateTime?
  createdAt    DateTime  @default(now())
  updatedAt    DateTime  @updatedAt
  
  // Relations...
  @@index([role])
  @@index([kycStatus])
  @@index([isActive])
  @@index([deletedAt])
  @@index([createdAt])
  @@index([role, isActive, createdAt(sort: Desc)])
  @@index([kycStatus, createdAt])
}
```

### Listing Model (Relevant to Audit)
```typescript
model Listing {
  id               String          @id @default(cuid())
  propertyId       String
  agentId          String?
  sellerId         String
  status           ListingStatus   @default(DRAFT) 
    // DRAFT, PENDING_REVIEW, ACTIVE, RESERVED, SOLD, RENTED, EXPIRED, REJECTED
  moderationScore  Float?
  moderationNotes  String?
  // ... other fields
  @@index([status])
  @@index([createdAt])
}
```

### **NO EXISTING AUDIT TABLE**
- ✅ No AuditLog model found
- ✅ No AdminAction model found
- ✅ Opportunity to implement from scratch following project patterns

---

## 3. ADMIN CONTROLLER ACTIONS & FLOW

### AdminController (User Management)
**File**: `presentation/controllers/admin.controller.ts`

#### Endpoints:
1. **GET /admin/users** - List users with filters
   - Query params: page, limit, role, isActive, search
   - Returns: UserListResult (paginated)

2. **GET /admin/users/:id** - Get user details
   - Returns: UserDetail (full profile + activity)

3. **PATCH /admin/users/status** - Update user active status
   - Body: `UpdateUserStatusDto` {userId, isActive, reason}
   - Current user (admin) captured via `@CurrentUser()`
   - Command: `UpdateUserStatusCommand(userId, adminId, isActive, reason)`

4. **POST /admin/users/ban** - Ban/unban user
   - Body: `BanUserDto` {userId, reason, unban?}
   - Command: `BanUserCommand(userId, adminId, reason, unban)`
   - **Key**: Admin ID is captured from JWT

5. **POST /admin/subscriptions/adjust** - Adjust subscription
   - Body: `AdjustSubscriptionDto` {userId, newPlanTier, reason}
   - Command: `AdjustSubscriptionCommand(userId, adminId, newPlanTier, reason)`

6. **GET /admin/dashboard** - Dashboard stats
   - Query: `GetDashboardStatsQuery`

7. **GET /admin/revenue** - Revenue statistics
   - Query params: startDate, endDate, groupBy (day/month)

### AdminModerationController (Content Moderation)
**File**: `presentation/controllers/admin-moderation.controller.ts`

#### Endpoints:
1. **GET /admin/moderation** - Get moderation queue
   - Query params: page, limit
   - Returns: ModerationQueueResult

2. **POST /admin/moderation/approve** - Approve listing
   - Body: `ApproveListingDto` {listingId, moderationNotes}
   - Command: `ApproveListingCommand(listingId, adminId, moderationNotes)`
   - Event: `ListingApprovedEvent` published

3. **POST /admin/moderation/reject** - Reject listing
   - Body: `RejectListingDto` {listingId, reason}
   - Command: `RejectListingCommand(listingId, adminId, reason)`
   - Event: `ListingRejectedEvent` published

4. **POST /admin/moderation/bulk** - Bulk moderate
   - Body: `BulkModerateDto` {listingIds[], action, reason}
   - Command: `BulkModerateListingsCommand(...)`

5. **GET /admin/kyc** - Get KYC queue
   - Returns: KycQueueResult (users with PENDING KYC)

6. **POST /admin/kyc/approve** - Approve KYC
   - Body: `ApproveKycDto` {userId, comments}
   - Command: `ApproveKycCommand(userId, adminId, comments)`
   - Event: `KycApprovedEvent` published

7. **POST /admin/kyc/reject** - Reject KYC
   - Body: `RejectKycDto` {userId, reason}
   - Command: `RejectKycCommand(userId, adminId, reason)`
   - Event: `KycRejectedEvent` published

### Key Pattern: Admin ID Capture
```typescript
@Post('moderation/approve')
async approveListing(
  @Body() dto: ApproveListingDto,
  @CurrentUser() user: JwtPayload,  // ← Admin's identity
) {
  return this.commandBus.execute(
    new ApproveListingCommand(dto.listingId, user.sub, dto.moderationNotes)
  );
  // user.sub = admin's userId
}
```

---

## 4. EXISTING EVENT/LOGGING INFRASTRUCTURE

### DomainEvent Interface
**Location**: `@modules/shared`

```typescript
// All domain events implement DomainEvent:
export interface DomainEvent {
  readonly eventName: string;
  readonly occurredAt: Date;
  readonly aggregateId: string;  // What changed (user/listing ID)
}
```

### Example: UserBannedEvent
```typescript
export class UserBannedEvent implements DomainEvent {
  readonly eventName = 'user.banned';
  readonly occurredAt = new Date();

  constructor(
    public readonly aggregateId: string,      // userId
    public readonly adminId: string,           // ← Admin who performed action
    public readonly reason: string,
  ) {}
}
```

### Example: ListingApprovedEvent
```typescript
export class ListingApprovedEvent implements DomainEvent {
  readonly eventName = 'listing.approved';
  readonly occurredAt = new Date();

  constructor(
    public readonly aggregateId: string,         // listingId
    public readonly adminId: string,             // ← Admin who approved
    public readonly moderationNotes?: string,
  ) {}
}
```

### Event Publishing & Listening
**Pattern Used**: NestJS CQRS + EventEmitter

#### Publishing (in Command Handlers):
```typescript
@CommandHandler(BanUserCommand)
export class BanUserHandler implements ICommandHandler<BanUserCommand> {
  constructor(
    private readonly userRepo: IUserRepository,
    private readonly eventBus: EventBus,  // ← Injected
  ) {}

  async execute(command: BanUserCommand): Promise<BanUserResult> {
    // ... business logic ...
    
    this.eventBus.publish(
      new UserBannedEvent(user.id, command.adminId, command.reason)
    );
    
    return { userId: user.id, isActive: false, message: 'Người dùng đã bị ban' };
  }
}
```

#### Listening (in Event Listeners):
```typescript
@Injectable()
export class UserBannedListener {
  constructor(
    private readonly commandBus: CommandBus,
    private readonly prisma: PrismaService,
    private readonly logger: LoggerService,
  ) {}

  @OnEvent('user.banned', { async: true })
  async handle(event: UserBannedEvent): Promise<void> {
    this.logger.log(
      `Handling user.banned for user ${event.aggregateId}`,
      'UserBannedListener'
    );

    // Side effects: deactivate listings, send notification, etc.
    const deactivated = await this.prisma.listing.updateMany({
      where: { sellerId: event.aggregateId, status: { in: ['ACTIVE', ...] } },
      data: { status: 'EXPIRED' },
    });

    // Send email notification
    await this.commandBus.execute(
      new SendNotificationCommand(user.id, 'EMAIL', 'user.banned', ...)
    );
  }
}
```

### EventBus Architecture
- **Module**: `@nestjs/cqrs`
- **Setup**: `CqrsModule.forRoot()` in `app.module.ts`
- **Mechanism**: 
  - Commands publish events via `eventBus.publish(event)`
  - Listeners subscribe via `@OnEvent(eventName, { async: true })`
  - Events are async by default (non-blocking)

---

## 5. LOGGER SERVICE

**Location**: `apps/api/src/modules/shared/infrastructure/logger.service.ts`

### Features
- **Provider**: Pino (structured logging)
- **PII Redaction**: Automatic masking of sensitive fields
  - Redacted paths: password, token, email, phone, kycData, creditCard, etc.
  - Censor pattern: `[REDACTED]`
- **Environment-aware**:
  - Dev: Pretty-printed with colors
  - Prod: Structured JSON
- **Methods**: 
  - `log(message, context)`
  - `error(message, trace, context)`
  - `warn(message, context)`
  - `debug(message, context)`
  - `verbose(message, context)`
  - `child(bindings)` - Child logger with context binding

### Redacted Fields
```typescript
redact: {
  paths: [
    'password', 'passwordHash', 'token', 'accessToken', 'refreshToken',
    'secret', 'authorization', 'cookie', 'creditCard', 'cardNumber',
    'cvv', 'ssn', 'cmnd', 'cccd', 'email', 'phone', 'kycData',
    'idNumber', 'identityNumber', 'dateOfBirth', 'dob', 'address',
    'bankAccount', 'accountNumber', 'apiKey', 'privateKey', 'encryptionKey',
    'req.headers.authorization', 'req.headers.cookie',
    'user.email', 'user.phone', 'user.kycData',
    'body.password', 'body.token', 'body.email', 'body.phone',
  ],
  censor: '[REDACTED]',
}
```

---

## 6. EXCEPTION HANDLING & FILTERS

### GlobalExceptionFilter
**Location**: `apps/api/src/modules/shared/infrastructure/filters/global-exception.filter.ts`

```typescript
@Catch()
export class GlobalExceptionFilter implements ExceptionFilter {
  constructor(private readonly logger: LoggerService) {}

  catch(exception: unknown, host: ArgumentsHost): void {
    const ctx = host.switchToHttp();
    const response = ctx.getResponse<Response>();
    const request = ctx.getRequest<Request>();
    const correlationId = (request.headers['x-correlation-id'] as string) ?? undefined;

    const errorResponse = this.buildErrorResponse(exception, correlationId);
    
    this.logger.error(
      `[${errorResponse.errorCode}] ${errorResponse.message}`,
      exception instanceof Error ? exception.stack : undefined,
      'GlobalExceptionFilter'
    );

    response.status(errorResponse.statusCode).json(errorResponse);
  }
}
```

### Error Response Structure
```typescript
interface ErrorResponseBody {
  statusCode: number;
  errorCode: ErrorCode;  // Enum with values like VALIDATION_FAILED, NOT_FOUND, etc.
  message: string;
  details?: Record<string, unknown>;
  correlationId?: string;
  timestamp: string;
}
```

### Domain Exceptions
```typescript
export class DomainException extends HttpException {
  constructor(
    public readonly errorCode: ErrorCode,
    message: string,
    statusCode: HttpStatus = HttpStatus.INTERNAL_SERVER_ERROR,
    public readonly details?: Record<string, unknown>,
  ) {
    super(message, statusCode);
  }
}

// Specific exceptions:
export class NotFoundException extends DomainException { ... }
export class ValidationException extends DomainException { ... }
export class ConflictException extends DomainException { ... }
export class UnauthorizedException extends DomainException { ... }
export class ForbiddenException extends DomainException { ... }
```

---

## 7. SECURITY & GUARDS

### Role-Based Access Control (RBAC)
**Location**: `apps/api/src/modules/auth/presentation/decorators/`

#### Pattern:
```typescript
@Controller('admin')
@UseGuards(JwtAuthGuard, RolesGuard)
@Roles('ADMIN')
export class AdminController {
  // All endpoints require ADMIN role
}
```

#### Roles Guard Flow:
1. `JwtAuthGuard` - Validates JWT token
2. `RolesGuard` - Checks `@Roles()` decorator against user.role
3. Both decorators from `@modules/auth`

### Rate Limiting
**Setup**: ThrottlerModule + ThrottlerBehindProxyGuard
- Default: 60 requests per 60 seconds per IP
- Auth endpoints: 10 requests per 60 seconds
- Payment callbacks: 20 requests per 60 seconds

---

## 8. DDD LAYER STRUCTURE

### Architectural Layers

```
Presentation Layer (Controllers)
    ↓ (DTO validation)
Application Layer (Commands/Queries/Handlers/Listeners)
    ↓ (Command/Query)
Domain Layer (Events, Interfaces, Business Rules)
    ↓ (Repository calls, Event publishing)
Infrastructure Layer (Prisma, Database)
```

### Command Handler Pattern
```typescript
// 1. Command (DTO-like)
export class BanUserCommand {
  constructor(
    public readonly userId: string,
    public readonly adminId: string,
    public readonly reason: string,
    public readonly unban: boolean = false,
  ) {}
}

// 2. Handler (Business Logic + Event Publishing)
@CommandHandler(BanUserCommand)
export class BanUserHandler implements ICommandHandler<BanUserCommand> {
  constructor(
    @Inject(USER_REPOSITORY) private readonly userRepo: IUserRepository,
    private readonly eventBus: EventBus,
  ) {}

  async execute(command: BanUserCommand): Promise<BanUserResult> {
    // Business logic
    const user = await this.userRepo.findById(command.userId);
    if (!user) throw new NotFoundException(...);
    
    user.deactivate();
    await this.userRepo.update(user);
    
    // Publish event
    this.eventBus.publish(
      new UserBannedEvent(user.id, command.adminId, command.reason)
    );
    
    return { userId: user.id, isActive: false, message: '...' };
  }
}

// 3. Event (Side-effect Trigger)
export class UserBannedEvent implements DomainEvent {
  readonly eventName = 'user.banned';
  readonly occurredAt = new Date();
  
  constructor(
    public readonly aggregateId: string,
    public readonly adminId: string,
    public readonly reason: string,
  ) {}
}

// 4. Listener (Side Effects - triggered by Event)
@Injectable()
export class UserBannedListener {
  @OnEvent('user.banned', { async: true })
  async handle(event: UserBannedEvent): Promise<void> {
    // Send notification, update related data, etc.
  }
}
```

### Query Handler Pattern
```typescript
// Query (read operation definition)
export class GetDashboardStatsQuery {}

// Handler (fetch & return data)
@QueryHandler(GetDashboardStatsQuery)
export class GetDashboardStatsHandler implements IQueryHandler<GetDashboardStatsQuery> {
  constructor(
    @Inject(ADMIN_QUERY_REPOSITORY) private readonly adminQueryRepo: IAdminQueryRepository,
  ) {}

  async execute(_query: GetDashboardStatsQuery): Promise<DashboardStats> {
    return this.adminQueryRepo.getDashboardStats();
  }
}
```

### Repository Pattern
```typescript
// Domain interface (no implementation details)
export interface IAdminQueryRepository {
  getModerationQueue(page: number, limit: number): Promise<ModerationQueueResult>;
  getDashboardStats(): Promise<DashboardStats>;
  // ... more methods
}

// Infrastructure implementation (Prisma-specific)
@Injectable()
export class PrismaAdminQueryRepository implements IAdminQueryRepository {
  constructor(private readonly prisma: PrismaService) {}

  async getModerationQueue(page: number, limit: number): Promise<ModerationQueueResult> {
    // Prisma queries here
  }
}

// DI Token
export const ADMIN_QUERY_REPOSITORY = Symbol('ADMIN_QUERY_REPOSITORY');

// Module registration
@Module({
  providers: [
    { provide: ADMIN_QUERY_REPOSITORY, useClass: PrismaAdminQueryRepository },
  ],
})
export class AdminModule {}
```

---

## 9. MODULE BOOTSTRAP

### AdminModule Setup
**File**: `apps/api/src/modules/admin/admin.module.ts`

```typescript
@Module({
  imports: [CqrsModule, AuthModule, ListingsModule, SubscriptionsModule],
  controllers: [AdminController, AdminModerationController],
  providers: [
    // Repositories
    { provide: ADMIN_QUERY_REPOSITORY, useClass: PrismaAdminQueryRepository },

    // CQRS Handlers
    ...CommandHandlers,  // 8 command handlers
    ...QueryHandlers,    // 6 query handlers

    // Event Listeners
    UserBannedListener,
    UserDeactivatedListener,
  ],
})
export class AdminModule {}
```

### Global Setup
**File**: `apps/api/src/app.module.ts`

```typescript
@Module({
  imports: [
    SentryModule.forRoot(),
    CqrsModule.forRoot(),              // ← CQRS with Event Bus
    ScheduleModule.forRoot(),
    ThrottlerModule.forRoot(...),      // ← Rate limiting
    // ... other modules including AdminModule
  ],
  providers: [
    {
      provide: APP_FILTER,
      useClass: SentryGlobalFilter,
    },
    {
      provide: APP_GUARD,
      useClass: ThrottlerBehindProxyGuard,
    },
    {
      provide: APP_INTERCEPTOR,
      useClass: HttpMetricsInterceptor,
    },
  ],
})
export class AppModule implements NestModule {
  configure(consumer: MiddlewareConsumer) {
    consumer.apply(SanitizeInputMiddleware).forRoutes('*');
    consumer.apply(CsrfMiddleware).exclude(...).forRoutes('*');
  }
}
```

---

## 10. EXISTING INTERCEPTOR PATTERNS

### HttpMetricsInterceptor
**Location**: `@modules/metrics`

- Injected globally via `APP_INTERCEPTOR`
- Tracks HTTP request/response metrics
- Could serve as a template for audit logging interceptor

### CSRF Middleware
**Location**: `@modules/shared/infrastructure/middleware/csrf.middleware`

- Double-submit cookie pattern
- Validates on state-changing methods
- Provides model for request context enhancement

---

## 11. SUMMARY FOR AUDIT LOGGING IMPLEMENTATION

### What's Already in Place ✅
1. **Event-driven architecture** - Commands publish events, listeners handle side effects
2. **Admin identity capture** - All admin actions have `adminId` in commands
3. **Logger service** - Pino-based with PII redaction
4. **Exception handling** - Global filter + DomainException hierarchy
5. **RBAC** - @Roles('ADMIN') guard in place
6. **Module bootstrap** - Clear DI pattern ready for audit repository injection
7. **DTO validation** - All inputs validated via class-validator

### What Needs to Be Built 🚀
1. **AuditLog Prisma Model** - Store in database
2. **AuditLoggingInterceptor** - Capture HTTP context (IP, timestamp, endpoint)
3. **AuditEvent Domain Event** - Extend domain events for audit purposes
4. **AuditLoggingListener** - Event listener that persists to AuditLog
5. **AuditLog Repository** - CRUD operations for AuditLog
6. **Query Handler** - Retrieve audit logs with filters (date range, admin, action type)
7. **Controller Endpoint** - GET /admin/audit-logs for viewing audit trail

### Key Integration Points
1. Commands already pass `adminId` → Use in AuditLoggingListener
2. Domain events already published → Hook audit listener to relevant events
3. HTTPContext (IP, user-agent, etc.) → Capture in interceptor
4. Logger service available → Use for structured logging
5. Repository pattern established → Follow for AuditLog repository

### Recommended Audit Fields
- `id` (primary key)
- `adminId` (who performed action)
- `adminName` (for denormalization)
- `action` (e.g., 'user.banned', 'listing.approved')
- `resourceType` (e.g., 'user', 'listing')
- `resourceId` (what was affected)
- `changes` (JSON of what changed - before/after)
- `reason` (from DTO if provided)
- `ipAddress` (from request)
- `userAgent` (from request)
- `status` (success/failure)
- `statusCode` (HTTP status)
- `errorMessage` (if failed)
- `duration` (milliseconds)
- `createdAt` (timestamp)

---

## Key Files Reference

### Controllers
- `presentation/controllers/admin.controller.ts` - Main admin operations
- `presentation/controllers/admin-moderation.controller.ts` - Moderation & KYC

### Command Handlers (Action Points)
- `application/commands/ban-user/ban-user.handler.ts`
- `application/commands/approve-listing/approve-listing.handler.ts`
- `application/commands/approve-kyc/approve-kyc.handler.ts`
- `application/commands/reject-listing/reject-listing.handler.ts`
- `application/commands/reject-kyc/reject-kyc.handler.ts`
- `application/commands/adjust-subscription/adjust-subscription.handler.ts`
- `application/commands/update-user-status/update-user-status.handler.ts`
- `application/commands/bulk-moderate-listings/bulk-moderate-listings.handler.ts`

### Event Listeners (Where to Hook Audit)
- `application/listeners/user-banned.listener.ts`
- `application/listeners/user-deactivated.listener.ts`

### Infrastructure
- `infrastructure/repositories/prisma-admin-query.repository.ts`
- `infrastructure/repositories/admin-stats.queries.ts`
- `infrastructure/repositories/admin-user.queries.ts`

### Shared Resources
- Logger: `@modules/shared/infrastructure/logger.service.ts`
- Exception Filter: `@modules/shared/infrastructure/filters/global-exception.filter.ts`
- Roles Guard: `@modules/auth` (decorators + guard)

### Prisma
- Schema: `prisma/schema.prisma` (602 lines, no audit model yet)
- Client type safety guaranteed

---

## Next Steps

1. ✅ **Schema Design** - Create AuditLog model in Prisma
2. ✅ **Repository Pattern** - Create AuditLogRepository with interface
3. ✅ **Audit Events** - Create domain events for audit purposes
4. ✅ **Event Listener** - Create AuditLoggingListener to persist events
5. ✅ **Interceptor** - Capture HTTP context (optional enhancement)
6. ✅ **Query Handler** - Create query/handler for retrieving audit logs
7. ✅ **Controller Endpoint** - Add GET /admin/audit-logs endpoint
8. ✅ **Tests** - Unit and integration tests
9. ✅ **Documentation** - API docs in Swagger