Your deep dive into implementing idempotency in ASP.NET Core APIs is both practical and informative. The step-by-step approach, including code examples for IdempotentAttribute and the IEndpointFilter, offers a clear path for developers to prevent duplicate operations, especially in distributed systems. I also appreciate the discussion on handling concurrent requests with distributed locks and using Redis for consistency across API instances. Adding tips on integrating this pattern with common .NET caching and middleware tools could further enhance this guide. Thanks for sharing this valuable resource!