Balance record

[ighormartins]

Every time a transfer occurs, it should not only save the value of the transfer, but the balance of the user before the transfer is commited.
In order for that to work, each exchange of tokens between two users, will end up being two transfers record, one for each user. Which isn't wrong, since both accounts were updated.

This will enable us to see our balance after each operation, just like we do in normal bank accounts.
With that feature, we will be able to easily see any user balance at any given point in time, which can lead to a nice "Race" feature in the frontend, showing not only whose in front in the leadboard, but the representation of how he did end up there, compared to other users

[ricardolobo]

I guess this is a implementation detail from the previous version. Please elaborate by giving an example of the database structure of the previous implementation you are alluding.