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User authentication and session management with Amazon Aurora DSQL
A detailed walkthrough of building a user authentication and session management service on Amazon Aurora DSQL, AWS's serverless PostgreSQL-compatible distributed SQL database. Covers the full architecture using Amazon ECS Express Mode with AWS Fargate, IAM-based database authentication (no stored passwords), data model design with UUIDs and token hashing, handling Aurora DSQL-specific constraints (no foreign keys, async index creation, 3,000-row transaction limit), Optimistic Concurrency Control retry logic, and production deployment best practices including least-privilege database roles and session cleanup jobs.