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You are tasked with designing a scalable, distributed file processing system in C#. This system will accept large files (e.g., CSV, JSON, XML) via an API, process them by extracting and transforming the data, 

and store the results in a data layer. The system must be able to handle hundreds of concurrent file uploads while ensuring reliability, performance, and scalability.

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System Design:

Describe the overall architecture of the system, including the components and interactions.

Explain the design decisions for handling concurrency, file processing, and database operations.

Code Implementation:

Write a simplified version of the API (file upload and status tracking) using C# and ASP.NET Core.

Implement a sample file processing worker that processes a file asynchronously and stores data in a database.

Optimizations:

Propose strategies for handling performance bottlenecks (e.g., large file sizes, database writes).

Discuss how you would optimize the system for high throughput.

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