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Project Documentation

Living documentation - updated as the project evolves

Last Updated: [Date]
Project Stage: [Development/Staging/Production]
Current Version: [Semantic version]

Table of Contents

Architecture

System Overview

[AI fills this section when implementing core architecture]

High-level diagram (describe or link):

Frontend (React) <-> API (Go) <-> Database (PostgreSQL)
                        |
                        v
                    Cache (Redis)

Key Architectural Decisions

Decision Log:

  • [Date]: [Decision made] - [Reasoning behind it]
  • [Date]: [Another decision] - [Why this approach]

Example:

  • 2025-10-30: Chose JWT over session-based auth - Better for horizontal scaling, stateless API, supports mobile clients

Tech Stack

Backend:

  • Language: [Go/Node.js/etc]
  • Framework: [Gin/Fiber/Express/etc]
  • Version: [Specify versions]

Frontend:

  • Language: TypeScript
  • Framework: [React/Next.js/etc]
  • Styling: [Tailwind CSS/etc]

Database:

  • Primary: [PostgreSQL/etc]
  • Cache: [Redis/etc]
  • Version: [Specify versions]

Infrastructure:

  • Local dev: [Docker Compose]
  • Production: [Kubernetes/ECS/etc]
  • Cloud provider: [AWS/GCP/Azure]

Project Structure

project/
├── apps/
│   ├── api/           # Backend service
│   └── ui/            # Frontend application
├── libs/              # Shared libraries
└── infra/             # Infrastructure code

[Add more detailed structure as project grows]

Authentication

[This section filled after implementing authentication]

Implementation Details

Token Strategy:

  • Access tokens: [Algorithm], [Lifetime]
  • Refresh tokens: [Storage location], [Lifetime]
  • Token rotation: [Enabled/Disabled]

Endpoints:

  • POST /api/auth/register - User registration
  • POST /api/auth/login - User login
  • POST /api/auth/refresh - Refresh access token
  • POST /api/auth/logout - Logout and invalidate tokens

Security Measures

  • Password hashing: [bcrypt cost 12]
  • Rate limiting: [5 attempts per minute per IP]
  • Token blacklist: [Redis with expiration]
  • HTTPS only: [Enforced in production]

Code References

  • Handler: apps/api/internal/handlers/auth.go
  • Service: apps/api/internal/services/auth.go
  • Middleware: apps/api/internal/middleware/auth.go

Testing

  • Unit tests: apps/api/tests/auth_test.go
  • Integration tests: apps/api/tests/integration/auth_test.go
  • Test coverage: [X%]

Database

[This section grows as schema evolves]

Schema

Tables:

users

CREATE TABLE users (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    email VARCHAR(255) UNIQUE NOT NULL,
    password_hash VARCHAR(255) NOT NULL,
    created_at TIMESTAMP DEFAULT NOW(),
    updated_at TIMESTAMP DEFAULT NOW()
);

[Add more tables as they're created]

Indexes

  • users.email - Unique index for login queries
  • [Add more indexes as created]

Migrations

Location: apps/api/migrations/
Current version: [003]
Tool: [golang-migrate/etc]

Migration history:

  • 001_initial_schema.up.sql - Created users table
  • 002_add_refresh_tokens.up.sql - Added refresh token storage
  • [Add new migrations as they're created]

Backup Strategy

[Fill this when implementing backups]

  • Frequency: [Daily/Hourly]
  • Retention: [30 days]
  • Location: [S3 bucket/etc]

API Endpoints

[Document endpoints as they're created]

Authentication

POST /api/auth/register

Register a new user.

Request:

{
  "email": "user@example.com",
  "password": "secure_password"
}

Response (201 Created):

{
  "data": {
    "user": {
      "id": "uuid",
      "email": "user@example.com",
      "created_at": "2025-10-30T10:00:00Z"
    },
    "access_token": "eyJhbG...",
    "refresh_token": "eyJhbG..."
  }
}

Errors:

  • 400 Bad Request: Invalid email format or weak password
  • 409 Conflict: Email already registered

POST /api/auth/login

Login existing user.

Request:

{
  "email": "user@example.com",
  "password": "secure_password"
}

Response (200 OK):

{
  "data": {
    "access_token": "eyJhbG...",
    "refresh_token": "eyJhbG..."
  }
}

Errors:

  • 400 Bad Request: Missing email or password
  • 401 Unauthorized: Invalid credentials
  • 429 Too Many Requests: Rate limit exceeded

[Add more endpoints as they're implemented]

Users

[Document user endpoints here]

[Other Resources]

[Add sections for other API resources]

Deployment

[Fill this section when implementing deployment]

Production Infrastructure

Environment: [AWS/GCP/Azure]
Region: [us-east-1/etc]

Services:

  • API: [Kubernetes cluster on EKS]
  • Database: [RDS PostgreSQL instance]
  • Cache: [ElastiCache Redis]
  • Load Balancer: [ALB/NLB]

Deployment Process

CI/CD Pipeline:

  1. Push to main branch
  2. GitHub Actions runs tests and builds
  3. Deploy to staging automatically
  4. Manual approval required for production
  5. Rolling update with zero downtime

Configuration:

  • Environment variables: Stored in [AWS Secrets Manager/etc]
  • Feature flags: [LaunchDarkly/custom]

Monitoring

Metrics:

  • Application logs: [CloudWatch/DataDog]
  • Error tracking: [Sentry]
  • Performance monitoring: [New Relic/DataDog]

Alerts:

  • Error rate > 1%: Alert on-call engineer
  • Response time > 1s: Warning notification
  • Service down: Page on-call immediately

Rollback Procedure

In case of critical issues:

# Rollback to previous version
kubectl rollout undo deployment/api

# Or rollback to specific revision
kubectl rollout undo deployment/api --to-revision=2

Troubleshooting

[Add issues and solutions as they're encountered]

Common Issues

Issue: Database connection timeout

Symptoms: API returns 500 errors, logs show "connection timeout"

Cause: Connection pool exhausted

Solution:

  1. Check for connection leaks in code
  2. Increase connection pool size in configuration:
db.SetMaxOpenConns(50) // Increased from 25

Date resolved: [Date]

Issue: JWT validation failing after deployment

Symptoms: All authenticated requests return 401

Cause: JWT secret changed between environments

Solution:

  1. Verify JWT_SECRET environment variable is set correctly
  2. Ensure RS256 public/private key pair is properly configured
  3. Check token expiration hasn't passed

Date resolved: [Date]

[Add more issues as they occur and are resolved]

Performance Optimization

Database Query Optimization

Issue: Slow user listing endpoint
Solution: Added index on users.created_at for sorting, reduced query time from 2s to 50ms

Issue: N+1 query problem in posts endpoint
Solution: Implemented eager loading with JOIN, reduced queries from N+1 to 1

[Document optimizations as implemented]

Health Checks

Endpoints:

  • /health - Basic health check (returns 200 if service is up)
  • /health/ready - Readiness check (checks database connectivity)
  • /health/live - Liveness check (for Kubernetes)

Example response:

{
  "status": "healthy",
  "database": "connected",
  "cache": "connected",
  "uptime": "3h 25m 10s"
}

Appendix

Environment Variables

Required:

  • DATABASE_URL - PostgreSQL connection string
  • REDIS_URL - Redis connection string
  • JWT_SECRET - Secret for JWT signing (or use RS256 keys)
  • PORT - Server port (default: 8080)

Optional:

  • LOG_LEVEL - Logging level (debug/info/warn/error)
  • CORS_ORIGINS - Allowed CORS origins
  • RATE_LIMIT_PER_MINUTE - Rate limit threshold

External Dependencies

Third-party services:

  • [Stripe] - Payment processing
  • [SendGrid] - Email delivery
  • [AWS S3] - File storage

API Keys:

  • Store in environment variables
  • Never commit to version control
  • Rotate regularly

Useful Commands

Development:

make dev          # Start development environment
make test         # Run tests
make lint         # Run linters

Database:

make db-migrate   # Run migrations
make db-reset     # Reset database (dev only)

Deployment:

make build        # Build production images
make deploy       # Deploy to production

Maintenance Notes:

  • Review this document monthly for outdated information
  • Update after significant changes
  • Keep troubleshooting section current with recent issues
  • Archive old decisions/issues to keep document focused

Last Major Update: [Date]
Next Review: [Date + 1 month]