System Architecture Design Document
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1. Overview
The system uses a microservices architecture with a central API gateway.
Each service communicates via REST APIs and message queues.

2. Authentication Module
The auth module handles user login, registration, and token management.
TODO: Implement refresh token rotation strategy
JWT tokens are used with a 15-minute expiry window.

3. Database Layer
We use PostgreSQL for relational data and Redis for caching.
TODO: Add database connection pooling configuration
TODO: Set up read replicas for reporting queries
The ORM layer abstracts direct SQL access for most operations.

4. API Gateway
All external requests route through the gateway for rate limiting.
The gateway handles SSL termination and request logging.

5. Monitoring
Prometheus metrics are collected from each service endpoint.
Grafana dashboards visualize the key performance indicators.
