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Technical Design Document: Voice AI Assistant

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Documentation Map

Requirements

1. System Architecture

• 1.1. High-Level Architecture
  • 1.1.1. Microservices-based architecture
  • 1.1.2. Event-driven communication
  • 1.1.3. API-first design
• 1.2. Core Components
  • 1.2.1. Task Management Service
  • 1.2.2. Time Tracking Service
  • 1.2.3. AI Monitoring Service
  • 1.2.4. Notification Service

2. Technology Stack

• 2.1. Backend
  • 2.1.1. Runtime: Node.js with TypeScript
  • 2.1.2. Framework: NestJS
  • 2.1.3. Database: PostgreSQL
  • 2.1.4. ORM: TypeORM
• 2.2. AI/ML Components
  • 2.2.1. LLM: OpenAI API
  • 2.2.2. Agent Framework: LangChain
  • 2.2.3. Vector Store: PostgreSQL with pgvector

3. Data Architecture

• 3.1. Database Schema
  • 3.1.1. Projects Table

    CREATE TABLE projects (
      id UUID PRIMARY KEY,
      name VARCHAR(255),
      priority INTEGER,
      created_at TIMESTAMP,
      updated_at TIMESTAMP
    );
    

  • 3.1.2. Tasks Table
  • 3.1.3. TimeEntries Table
  • 3.1.4. Notifications Table
• 3.2. Data Flow
  • 3.2.1. Task Creation Flow
  • 3.2.2. Time Tracking Flow
  • 3.2.3. Notification Flow
• 3.3. Analytics Schema
  • 3.3.1. Usage Metrics Table

    CREATE TABLE usage_metrics (
      id UUID PRIMARY KEY,
      metric_type VARCHAR(50),
      value JSONB,
      timestamp TIMESTAMP
    );
    

4. API Design

• 4.1. RESTful Endpoints
  • 4.1.1. Task Management API

    @Controller('tasks')
    export class TasksController {
      @Post()
      async createTask(@Body() dto: CreateTaskDto): Promise<Task> {}
          
      @Get(':id')
      async getTask(@Param('id') id: string): Promise<Task> {}
    }
    

  • 4.1.2. Time Tracking API
  • 4.1.3. Notification API

5. Integration Specifications

• 5.1. Toggl Integration
  • 5.1.1. Authentication

    interface TogglConfig {
      apiToken: string;
      workspaceId: number;
      userAgent: string;
    }
    

  • 5.1.2. Data Sync Strategy
  • 5.1.3. Error Handling
• 5.2. Calendar Integration
  • 5.2.1. OAuth2 Implementation
  • 5.2.2. Event Processing
  • 5.2.3. Conflict Resolution

6. AI Implementation

• 6.1. LLM Integration
  • 6.1.1. Prompt Engineering
  • 6.1.2. Context Management
  • 6.1.3. Response Processing
• 6.2. Agent System
  • 6.2.1. Agent Architecture
  • 6.2.2. Decision Making Logic
  • 6.2.3. Action Implementation

7. Security Architecture

• 7.1. Authentication
  • 7.1.1. JWT Implementation
  • 7.1.2. Token Management
  • 7.1.3. Refresh Strategy
• 7.2. Data Protection
  • 7.2.1. Encryption at Rest
  • 7.2.2. Encryption in Transit
  • 7.2.3. API Security

8. Testing Strategy

• 8.1. Unit Testing
  • 8.1.1. Jest Configuration
  • 8.1.2. Mock Implementations
  • 8.1.3. Test Coverage Goals
• 8.2. Integration Testing
  • 8.2.1. API Testing
  • 8.2.2. Service Integration Tests
  • 8.2.3. E2E Testing

9. Deployment Architecture

• 9.1. Infrastructure
  • 9.1.1. Docker Configuration
  • 9.1.2. Kubernetes Setup
  • 9.1.3. Cloud Services (AWS/GCP)
• 9.2. CI/CD Pipeline
  • 9.2.1. GitHub Actions Workflow
  • 9.2.2. Deployment Strategy
  • 9.2.3. Monitoring Setup

10. Development Environment

• 10.1. Framework Setup
  • 10.1.1. TypeScript Configuration

    {
      "compilerOptions": {
        "target": "ES2021",
        "module": "commonjs",
        "strict": true,
        "experimentalDecorators": true
      }
    }
    

  • 10.1.2. NestJS Architecture
  • 10.1.3. Development Tools
• 10.2. Testing Framework
  • 10.2.1. Jest Setup

    const config = {
      preset: 'ts-jest',
      testEnvironment: 'node',
      coverageThreshold: {
        global: {
          branches: 80,
          functions: 80,
          lines: 80
        }
      }
    };
    

  • 10.2.2. E2E Testing with Supertest
  • 10.2.3. Test Data Management
• 10.3. Logging System
  • 10.3.1. Winston Configuration

    const logger = winston.createLogger({
      level: 'info',
      format: winston.format.json(),
      transports: [
        new winston.transports.File({ filename: 'error.log', level: 'error' }),
        new winston.transports.File({ filename: 'combined.log' })
      ]
    });
    

  • 10.3.2. Log Aggregation
  • 10.3.3. Monitoring Integration