The API is designed as a stateless system. All authentication state is encapsulated within client-side JSON Web Tokens (JWTs).
- Benefit: Enables seamless horizontal scaling.
- Implementation: No shared session storage or "sticky sessions" are required at the load balancer level.
The service supports the deployment of multiple API instances behind a standard load balancer (e.g., Nginx, AWS ALB) without requiring inter-instance coordination.
The codebase is structured to facilitate a transition to a microservices architecture without a rewrite of business logic. It is prepared for decomposition into:
- Auth Service: Handling identity and token issuance.
- User Service: Managing profiles and RBAC.
- Todo Service: Core domain logic.
To ensure data integrity and performance at scale:
- Indexing: Frequent query paths are indexed to maintain low latency.
- Soft Deletes: Implemented across all entities to preserve data history and referential integrity.
- RBAC Extensibility: Role mappings are decoupled from user entities to allow for granular permission scaling.
The architecture supports the following "plug-and-play" enhancements:
- Redis Integration: For high-throughput, read-heavy endpoints.
- Security Middleware: Token blacklisting or rate-limiting can be integrated at the gateway or middleware level.