Unread message counter per registered user.

[nanu-c]

It should be possible to get a sessions list with Name/username/groupname as title, a unread counter and last message, how would you do that?

[gferon]

How would you like to have this implemented? We currently have access to a stream of messages, ordered by server-side timestamp. I suppose we could add a simple setter/getter to the store per thread? That way, clients can mark where the cursor is set.

[nanu-c]

Actually i don't know how cursors work in sled. I had the idea of adding a tree similar to one for the messages that keeps the ids of the unread messages. Then we can use .count() for getting the actual number.
There store is updated when

• the client asks for messages and the timestamp is inside -> or we make it more simple like get message in chat x resets the counter for x
• we receive a sync message that was send from another device. -> indication for messages were read some where else
• we receive a data message -> increment by 1
  That means, we can implement the message read functionality of signal

I would keep the logic as much as possible inside presage, but we can provide a setter/getter, too.