Protobuf attributes for JournalEntry

gistfile1.cs

[ProtoContract(ImplicitFields = ImplicitFields.AllFields)]
[Serializable]
public abstract class JournalEntry
{
    public readonly long Id;

    public readonly DateTime Created;

    public JournalEntry(long id, DateTime? created  = null)
    {
        Created = created ?? DateTime.Now;
        Id = id;
    }

}

[ProtoContract(ImplicitFields = ImplicitFields.AllFields)]
[ProtoInclude(42, typeof(JournalEntry))]
[Serializable]
public class JournalEntry<T> : JournalEntry
{
        
    public T Item { get; protected internal set; }
		
	public JournalEntry(long id, T item, DateTime? created = null) : base(id, created)
	{
        Item = item;
	}
}