[Ammako]

Money Trail tracks money gains/losses on a per-session basis along with tracking your gold across characters, if you'd prefer something which doesn't rely on a LDB panel.

(Note that per-session includes /reload)

If you wanted something that can track gains and losses across multiple days then I'm not sure, but since you specified Per Session I hope that would be plenty.

Downside is, if you use any bag addons that replace the default Blizzard ones, it's possible it may not be supported there. It supports a lot of replacement bag addons, but there can be some it doesn't support.