# Implementation Report: Admin Interventions Endpoints (BE-001)

**Date:** 2025-11-24
**Task:** BE-001 - Create Intervention Management Endpoints for Admin Portal
**Status:** ✅ COMPLETED

---

## Executive Summary

Successfully implemented complete REST API endpoints for managing student intervention alerts in the Admin Portal. The system allows administrators to view, acknowledge, resolve, and dismiss alerts generated automatically by the database when students show signs of struggling.

---

## Endpoints Implemented

### Base Route: `/admin/interventions`

All endpoints require:
- Authentication: `JwtAuthGuard`
- Authorization: `AdminGuard` (roles: SUPER_ADMIN, ADMIN_TEACHER)
- Bearer token in Authorization header

| Method | Endpoint | Description | Status Code |
|--------|----------|-------------|-------------|
| GET | `/admin/interventions` | List all alerts with filters | 200 |
| GET | `/admin/interventions/:id` | Get specific alert | 200 |
| PATCH | `/admin/interventions/:id/acknowledge` | Mark as acknowledged | 200 |
| PATCH | `/admin/interventions/:id/resolve` | Mark as resolved | 200 |
| DELETE | `/admin/interventions/:id/dismiss` | Dismiss alert | 200 |

---

## Files Created

### 1. DTOs (Data Transfer Objects)

#### `/apps/backend/src/modules/admin/dto/interventions/`

**intervention-alert.dto.ts**
```typescript
export enum InterventionAlertType {
  NO_ACTIVITY = 'no_activity',
  LOW_SCORE = 'low_score',
  DECLINING_TREND = 'declining_trend',
  REPEATED_FAILURES = 'repeated_failures',
  EXCESSIVE_TIME = 'excessive_time',
  LOW_ENGAGEMENT = 'low_engagement',
}

export enum InterventionSeverity {
  LOW = 'low',
  MEDIUM = 'medium',
  HIGH = 'high',
  CRITICAL = 'critical',
}

export enum InterventionStatus {
  ACTIVE = 'active',
  ACKNOWLEDGED = 'acknowledged',
  RESOLVED = 'resolved',
  DISMISSED = 'dismissed',
}

export class InterventionAlertDto {
  id: string;
  student_id: string;
  student_name: string;
  student_email: string;
  classroom_id?: string;
  classroom_name?: string;
  alert_type: InterventionAlertType;
  severity: InterventionSeverity;
  title: string;
  description?: string;
  metrics?: Record<string, any>;
  status: InterventionStatus;
  generated_at: Date;
  acknowledged_at?: Date;
  acknowledged_by?: string;
  acknowledged_by_name?: string;
  resolved_at?: Date;
  resolved_by?: string;
  resolved_by_name?: string;
  resolution_notes?: string;
  tenant_id: string;
  created_at: Date;
  updated_at: Date;
}
```

**list-interventions.dto.ts**
- Filters: severity, status, alert_type, student_id, classroom_id, date_from, date_to
- Pagination: page (default: 1), limit (default: 20, max: 100)

**acknowledge-intervention.dto.ts**
- acknowledgment_note?: string (optional)

**resolve-intervention.dto.ts**
- resolution_notes: string (required, min 10 characters)

**paginated-interventions.dto.ts**
- data: InterventionAlertDto[]
- total: number
- page: number
- limit: number
- total_pages: number

**index.ts**
- Exports all DTOs

---

### 2. Service

**File:** `/apps/backend/src/modules/admin/services/admin-interventions.service.ts`

**Methods:**
```typescript
class AdminInterventionsService {
  // List alerts with filters and pagination
  async listInterventions(filters: ListInterventionsDto): Promise<PaginatedInterventionsDto>

  // Get single alert by ID
  async getInterventionById(id: string): Promise<InterventionAlertDto>

  // Acknowledge alert (active → acknowledged)
  async acknowledgeIntervention(id: string, note: string | undefined, userId: string): Promise<InterventionAlertDto>

  // Resolve alert (active/acknowledged → resolved)
  async resolveIntervention(id: string, notes: string, userId: string): Promise<InterventionAlertDto>

  // Dismiss alert (any status → dismissed)
  async dismissIntervention(id: string): Promise<InterventionAlertDto>
}
```

**Key Features:**
- Uses raw SQL queries via DataSource for optimal performance
- Joins with `auth_management.profiles` for student/admin names
- Joins with `social_features.classrooms` for classroom names
- Orders by severity (critical > high > medium > low), then by date DESC
- Validates status transitions before updates
- Comprehensive error handling with proper exceptions

**Database Queries:**
- SELECT queries with LEFT JOINs for enriched data
- Status validation before state transitions
- Uses `gamilit.now_mexico()` for timestamp consistency
- Parameterized queries for SQL injection protection

---

### 3. Controller

**File:** `/apps/backend/src/modules/admin/controllers/admin-interventions.controller.ts`

**Guards:**
- `@UseGuards(JwtAuthGuard, AdminGuard)`
- Applied at controller level

**Swagger Documentation:**
- `@ApiTags('Admin - Interventions')`
- Full OpenAPI documentation for all endpoints
- Request/response examples
- Error response codes documented

**Endpoints Implementation:**

1. **GET /admin/interventions**
   - Query params: ListInterventionsDto
   - Returns: PaginatedInterventionsDto
   - Supports multiple filters and pagination

2. **GET /admin/interventions/:id**
   - Param: id (UUID)
   - Returns: InterventionAlertDto
   - 404 if not found

3. **PATCH /admin/interventions/:id/acknowledge**
   - Param: id (UUID)
   - Body: AcknowledgeInterventionDto
   - Returns: InterventionAlertDto
   - Validates: status must be 'active'

4. **PATCH /admin/interventions/:id/resolve**
   - Param: id (UUID)
   - Body: ResolveInterventionDto
   - Returns: InterventionAlertDto
   - Validates: status must be 'active' or 'acknowledged'
   - Validates: resolution_notes min 10 chars

5. **DELETE /admin/interventions/:id/dismiss**
   - Param: id (UUID)
   - Returns: InterventionAlertDto
   - HTTP 200 (not 204) to return updated object

**User Context:**
- Extracts user ID from request: `req.user?.id || req.user?.sub`
- Used for acknowledged_by and resolved_by tracking

---

### 4. Module Registration

**File:** `/apps/backend/src/modules/admin/admin.module.ts`

**Changes:**
```typescript
// Imports added
import { AdminInterventionsController } from './controllers/admin-interventions.controller';
import { AdminInterventionsService } from './services/admin-interventions.service';

// Controllers array
controllers: [
  // ... existing controllers
  AdminInterventionsController, // NEW: Student intervention alerts (BE-001)
],

// Providers array
providers: [
  // ... existing providers
  AdminInterventionsService, // NEW: Student intervention alerts service (BE-001)
],

// Exports array
exports: [
  // ... existing exports
  AdminInterventionsService, // NEW: Export interventions service (BE-001)
],
```

---

## Database Integration

### Source Table
**Schema:** `progress_tracking`
**Table:** `student_intervention_alerts`

**Structure:**
```sql
- id: uuid (PK)
- student_id: uuid (FK → auth_management.users)
- classroom_id: uuid (FK → social_features.classrooms)
- alert_type: text (CHECK constraint)
- severity: text (CHECK constraint)
- title: text
- description: text
- metrics: jsonb
- status: text (CHECK constraint, default 'active')
- generated_at: timestamptz
- acknowledged_at: timestamptz
- acknowledged_by: uuid
- resolved_at: timestamptz
- resolved_by: uuid
- resolution_notes: text
- tenant_id: uuid
- created_at: timestamptz
- updated_at: timestamptz
```

**Alert Types (CHECK constraint):**
- no_activity
- low_score
- declining_trend
- repeated_failures
- excessive_time
- low_engagement

**Severities (CHECK constraint):**
- low
- medium
- high
- critical

**Statuses (CHECK constraint):**
- active
- acknowledged
- resolved
- dismissed

---

## Query Optimization

### Ordering Strategy
Alerts are ordered by:
1. **Severity** (using CASE statement):
   - critical → 1
   - high → 2
   - medium → 3
   - low → 4
2. **generated_at DESC** (most recent first)

This ensures critical alerts always appear first, regardless of date.

### JOIN Strategy
```sql
INNER JOIN auth_management.profiles sp ON sp.user_id = a.student_id
LEFT JOIN social_features.classrooms c ON c.id = a.classroom_id
LEFT JOIN auth_management.profiles ap ON ap.user_id = a.acknowledged_by
LEFT JOIN auth_management.profiles rp ON rp.user_id = a.resolved_by
```

- INNER JOIN for student (always required)
- LEFT JOIN for classroom (optional - students may not be in classroom)
- LEFT JOIN for acknowledger/resolver (only present after action taken)

---

## Status Transition Rules

### Acknowledge
- **From:** active
- **To:** acknowledged
- **Requires:** None (note is optional)
- **Records:** acknowledged_by, acknowledged_at

### Resolve
- **From:** active OR acknowledged
- **To:** resolved
- **Requires:** resolution_notes (min 10 chars)
- **Records:** resolved_by, resolved_at, resolution_notes

### Dismiss
- **From:** Any status
- **To:** dismissed
- **Requires:** None
- **Records:** Only updates status and updated_at

---

## Error Handling

### NotFoundException (404)
- Alert ID not found in database
- Thrown by: getInterventionById, acknowledgeIntervention, resolveIntervention, dismissIntervention

### BadRequestException (400)
- Attempting to acknowledge alert not in 'active' status
- Attempting to resolve alert not in 'active' or 'acknowledged' status
- Resolution notes less than 10 characters (validation pipe)

### UnauthorizedException (401)
- Missing or invalid JWT token
- Handled by JwtAuthGuard

### ForbiddenException (403)
- User does not have SUPER_ADMIN or ADMIN_TEACHER role
- Handled by AdminGuard

---

## Testing

### Test Script Created
**File:** `/apps/backend/scripts/test-interventions-endpoints.sh`

**Features:**
- Tests all 5 endpoints
- Demonstrates filter combinations
- Shows pagination usage
- Includes success/error scenarios
- Colorized output for readability

**Usage:**
```bash
./apps/backend/scripts/test-interventions-endpoints.sh <JWT_TOKEN>
```

**Test Cases:**
1. List all alerts (no filters)
2. List alerts with severity and status filters
3. List alerts by alert_type
4. List with pagination
5. Get alert by ID
6. Acknowledge alert
7. Resolve alert
8. Dismiss alert

---

## Integration with Existing System

### Pattern Followed
Implementation follows the exact pattern of `AdminAlertsController` and `AdminAlertsService`:
- Similar file structure
- Same guard usage
- Consistent DTO naming conventions
- Identical error handling approach
- Same Swagger documentation style

### Data Flow
```
Student completes exercise
  ↓
Database trigger: generate_student_alerts()
  ↓
student_intervention_alerts table populated
  ↓
Admin Portal fetches via GET /admin/interventions
  ↓
Admin acknowledges/resolves/dismisses via PATCH/DELETE
  ↓
Status updated in database
  ↓
Teacher dashboards reflect alert status
```

---

## API Usage Examples

### 1. List All Active Critical Alerts
```bash
GET /admin/interventions?severity=critical&status=active&page=1&limit=20
```

**Response:**
```json
{
  "data": [
    {
      "id": "uuid",
      "student_id": "uuid",
      "student_name": "Juan Pérez",
      "student_email": "juan@example.com",
      "classroom_id": "uuid",
      "classroom_name": "6to Grado A",
      "alert_type": "repeated_failures",
      "severity": "critical",
      "title": "Estudiante con fallos repetidos",
      "description": "3 ejercicios fallidos consecutivos en Módulo 2",
      "metrics": {
        "consecutive_failures": 3,
        "module_id": "uuid",
        "last_failure_date": "2025-11-24T10:30:00Z"
      },
      "status": "active",
      "generated_at": "2025-11-24T10:35:00Z",
      "tenant_id": "uuid",
      "created_at": "2025-11-24T10:35:00Z",
      "updated_at": "2025-11-24T10:35:00Z"
    }
  ],
  "total": 15,
  "page": 1,
  "limit": 20,
  "total_pages": 1
}
```

### 2. Acknowledge Alert
```bash
PATCH /admin/interventions/{id}/acknowledge
Content-Type: application/json

{
  "acknowledgment_note": "Contacting parent and scheduling meeting"
}
```

**Response:**
```json
{
  "id": "uuid",
  "student_id": "uuid",
  "student_name": "Juan Pérez",
  "student_email": "juan@example.com",
  "status": "acknowledged",
  "acknowledged_by": "admin-user-id",
  "acknowledged_by_name": "María González",
  "acknowledged_at": "2025-11-24T11:00:00Z",
  // ... other fields
}
```

### 3. Resolve Alert
```bash
PATCH /admin/interventions/{id}/resolve
Content-Type: application/json

{
  "resolution_notes": "Met with student and parent. Identified learning gap in fractions. Created personalized study plan with additional support materials. Will monitor weekly progress."
}
```

### 4. Dismiss Alert
```bash
DELETE /admin/interventions/{id}/dismiss
```

---

## Swagger Documentation

All endpoints are fully documented in Swagger UI:
- Access: `http://localhost:3000/api-docs`
- Tag: "Admin - Interventions"
- Includes request/response schemas
- Shows all possible error codes
- Interactive testing interface

---

## Security Considerations

### Authentication
- All endpoints protected by JwtAuthGuard
- Requires valid Bearer token
- Token validated on every request

### Authorization
- AdminGuard enforces role-based access
- Only SUPER_ADMIN and ADMIN_TEACHER roles allowed
- Role checked after authentication

### Data Protection
- User IDs tracked for all actions (acknowledged_by, resolved_by)
- Audit trail via created_at, updated_at timestamps
- Tenant isolation via tenant_id (ready for multi-tenancy)

### Input Validation
- All DTOs use class-validator decorators
- UUID format validation
- Enum validation for alert_type, severity, status
- String length validation (resolution_notes min 10 chars)
- Date format validation (ISO 8601)
- Pagination limits (max 100 items per page)

### SQL Injection Prevention
- All queries use parameterized statements
- No string concatenation in SQL
- TypeORM DataSource with proper escaping

---

## Performance Considerations

### Pagination
- Default: 20 items per page
- Maximum: 100 items per page
- Prevents large data transfers

### Query Optimization
- Indexed columns (severity, status, generated_at)
- Efficient JOIN strategy
- COUNT query separate from data query
- LIMIT/OFFSET for pagination

### Response Size
- Only necessary fields returned
- Optional fields omitted when null
- No nested objects (flat structure)

---

## Future Enhancements

### Potential Additions (Not in Current Scope)
1. Bulk operations (acknowledge/resolve multiple alerts)
2. Alert statistics/aggregations endpoint
3. Notification system integration
4. Auto-dismiss rules for stale alerts
5. Alert priority/urgency scoring
6. Email notifications to admins
7. Export to CSV/Excel
8. Alert history/changelog tracking
9. Custom alert rules configuration
10. Integration with teacher assignment system

---

## Compilation Status

✅ **Build successful** - No TypeScript errors

```bash
npm run build
# Compiles without errors
```

---

## Checklist

- [x] DTOs created with full validation
- [x] Service implemented with all CRUD methods
- [x] Controller created with all endpoints
- [x] Module registration updated
- [x] Swagger documentation complete
- [x] Error handling implemented
- [x] Status transition validation
- [x] User tracking (acknowledged_by, resolved_by)
- [x] Test script created
- [x] Code follows existing patterns
- [x] TypeScript compilation successful
- [x] No breaking changes to existing code
- [x] Documentation complete

---

## Related Files

### Controllers
- `/apps/backend/src/modules/admin/controllers/admin-interventions.controller.ts`
- Pattern reference: `admin-alerts.controller.ts`

### Services
- `/apps/backend/src/modules/admin/services/admin-interventions.service.ts`
- Pattern reference: `admin-alerts.service.ts`

### DTOs
- `/apps/backend/src/modules/admin/dto/interventions/intervention-alert.dto.ts`
- `/apps/backend/src/modules/admin/dto/interventions/list-interventions.dto.ts`
- `/apps/backend/src/modules/admin/dto/interventions/acknowledge-intervention.dto.ts`
- `/apps/backend/src/modules/admin/dto/interventions/resolve-intervention.dto.ts`
- `/apps/backend/src/modules/admin/dto/interventions/paginated-interventions.dto.ts`
- `/apps/backend/src/modules/admin/dto/interventions/index.ts`

### Module
- `/apps/backend/src/modules/admin/admin.module.ts`

### Testing
- `/apps/backend/scripts/test-interventions-endpoints.sh`

### Database
- `/apps/database/ddl/schemas/progress_tracking/tables/15-student_intervention_alerts.sql`
- `/apps/database/ddl/schemas/progress_tracking/functions/15-generate_student_alerts.sql`

---

## Summary

Successfully implemented a complete, production-ready REST API for managing student intervention alerts in the Admin Portal. The implementation:

- Follows established patterns from existing controllers
- Provides comprehensive filtering and pagination
- Includes full Swagger documentation
- Implements proper error handling and validation
- Tracks user actions for audit purposes
- Integrates seamlessly with existing database schema
- Compiles without errors
- Includes test script for validation

The endpoints are ready for frontend integration and production deployment.

---

**Implementation Date:** 2025-11-24
**Implemented By:** Claude Code
**Task ID:** BE-001
**Status:** ✅ COMPLETED
