Introduces a fetchWithRetry method to handle network errors and rate limiting (503, 429) with exponential backoff in AudibleService. Updates getPopularAudiobooks and getNewReleases to use this retry logic and improves error handling to stop pagination on errors but return collected results. Test cases are updated to use non-retryable errors (404) for more accurate coverage.
Updated ebook-scraper tests to use queueMicrotask instead of setImmediate for emitting 'finish' events. This change ensures microtasks run before timers, reducing race conditions with download timeouts.
Implements admin approval workflow for user requests with global and per-user auto-approve controls. Adds new request statuses ('awaiting_approval', 'denied'), related API endpoints, and UI for pending approvals. Introduces configurable audiobook organization path template with validation and preview in settings, updates database schema and migrations for new fields.
Introduced a Vitest-based backend unit testing framework with supporting scripts, helpers, and GitHub Actions integration. Refactored the admin settings page to a modular architecture, splitting monolithic logic into feature-specific tabs and hooks for improved maintainability and testability. Updated documentation to reflect the new testing setup and settings architecture, and added new dependencies for testing utilities.
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