C# Question

You are tasked with designing and deploying a scalable, secure, and maintainable RESTful Web API for managing tourism data (regions and walking trails) using ASP.NET Core Web API and .NET 7.

Explain how you would architect this system from development to deployment by addressing the following:

1. Design the API using domain-driven principles, clearly distinguishing between Domain Models and DTOs, and justify how the Repository Pattern and Dependency Injection improve maintainability and testability.
2. Implement database integration using Entity Framework Core, including migrations, connection configuration, and database creation, while ensuring smooth version control and schema evolution.
3. Configure authentication and authorization using Microsoft Identity and JWT tokens, and explain how role-based authorization can be enforced across endpoints and integrated into Swagger UI for secure testing.
4. Demonstrate how Automapper can be used to efficiently map between models, and evaluate its impact on performance and code readability in large-scale APIs.
5. Apply asynchronous programming (async/await) to improve API responsiveness and scalability under high request loads, and analyze potential pitfalls such as deadlocks or improper async usage.
6. Integrate logging and monitoring using Serilog to track application behavior, errors, and security events, and explain how structured logging improves debugging and production maintenance.
7. Enhance API usability by implementing filtering, sorting, and pagination, and justify how these features improve performance and user experience for large datasets.
8. Propose a testing and documentation strategy using Swagger UI and Postman, ensuring the API is easy to consume, secure to test, and ready for deployment in multiple environments.

Finally, critically evaluate how all these components work together to create a production-ready enterprise Web API, and identify potential scalability, security, and maintainability challenges that may arise over time.

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