This pull request introduces several significant improvements to the content management features in the backend, focusing on robustness and feature completeness. Notably, it implements the ability to delete content, adds an endpoint to refresh content, and enhances the download logic with retry capabilities. The changes also include updates to controllers, service layers, permissions, and tests to support these new features.

Content Management Features

• Implemented DeleteContentUseCase with a full stack (controller, service, command, interface) allowing deletion of content by link ID. [1] [2] [3] [4] Fdb06b47L139R139, Fdb06b47L150R150, [5]
• Added a "refresh content" endpoint and business logic to re-trigger content download for a given link, including controller and service updates. [1] [2] [3] [4] Fdb06b47L105R105)

Robustness Improvements

• Enhanced DownloadContentService with retry logic (3 retries, 1s delay) for content downloads to improve reliability. [1] [2]

Controller and API Updates

• Updated GetContentController to support both standard content retrieval and refresh operations; added DeleteContentController. [1] Fdb06b47L139R139, Fdb06b47L150R150, [2]
• Adjusted API route permission checks to differentiate between GET, POST (refresh), and DELETE operations for content endpoints.

Testing Enhancements

• Added and updated tests for new controller methods (refreshContent and deletion), including mocks for new service dependencies. [1] [2] [3]

Documentation

• Updated ROADMAP.md to mark the new features and improvements as completed, with brief implementation notes.