doWork

Performs the background data synchronization work.

This method:

1. Promotes the worker to a foreground service with a progress notification

2. Calls the repository's sync method which returns a Flow of progress updates

3. Updates the notification as sync progresses

4. Returns success/retry/failure based on the outcome

Sync Flow

homeRepository.sync() // Returns Flow<SyncProgress>
    .collect { progress ->
        // Update notification with current progress
        setForeground(getForegroundInfo(progress.total, progress.current))
    }

Error Handling

• Retry: If runAttemptCount<TOTAL_SYNC_ATTEMPTS, returns Result.retry()

• Failure: After exhausting retries, returns Result.failure()

• Success: Returns Result.success() when sync completes without errors

Threading

All operations run on ioDispatcher to avoid blocking the main thread.