/// <inheritdoc />
 public Task <IEnumerable <GetAllToDoHeadersQuery.ToDoHeader> > Handle(
     GetAllToDoHeadersQuery request,
     CancellationToken cancellationToken)
 => _cache.GetAndSetAsync(
     GetKey <GetAllToDoHeadersQuery.ToDoHeader>(request.UserId),
     () => _database.Query <GetAllToDoHeadersQuery.ToDoHeader>().Where($"UserId = {request.UserId}").AsEnumerable(),
     _options.Value);