Well, FreeFrom team. In FreeFrom, a user can upload 9 pictures at once without waiting. I wrote a in-app fake relay (local) to handle the pending event which contains still uploading resource URIs. The sender will see this event be published and rendered immediately. Now I am planning to extend this relay to store history events.
Of course, this in-app relay may be different than the local relay you mentioned. But I think the idea is the same. Maybe I am wrong  

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 Yes, I think we should avoid in-app relays. Otherwise, all apps will have a database with the same stuff over and over again. I think it should be an independent app.  

 You are right. It’s better to make local relay independent.