/// <summary>
/// Asynchronously apply provided action to each element in source sequence.
/// Sequence elements processed sequentially.
/// </summary>
/// <typeparam name="TSource">Source sequence element type.</typeparam>
/// <param name="source">Source sequence.</param>
/// <param name="action">Action to apply to each sequence element.</param>
/// <param name="token">Optional asynchronous operation cancellation token.</param>
/// <returns>Asynchronous operation completion task.</returns>
public static Task ForEachAsyncLinqToDB <TSource>(
this IQueryable <TSource> source,
Action <TSource> action,
CancellationToken token = default)
=> AsyncExtensions.ForEachAsync(source.ToLinqToDB(), action, token);