DownloadAndReadMetadata.cs

public void DownloadAndReadMetadata(int imageId)
{
    // Get scheduled image from db
    var image = _context.ScheduledImages.Find(imageId);
    
    // Download file
    var stream = _downloader.Download(image.DownloadUrl);

    // Read metadata
    var metadata = _reader.ReadFromStream(stream);

    // Save entities

    image.JobCompletedDate = DateTime.UtcNow;
    _context.MarkAsModified(image);

    metadata.ForEach(tag =>
    {
        tag.ScheduledImageId = imageId;
        _context.ImageMetadataTags.Add(tag);
    });
    _context.SaveChanges();
}