There’s no way that I know to merge the database data. You can easily move your database to a new system, and if you need instruction on that please e-mail support and they can walk you through that. If you’re playing on a poker site that sends full hand histories, like a poker stars or americas card room for example, you can copy over the stored hands and import them onto your new system. It’s not a merge, but it’s a way to move data across.
And yes, we are working on a faux cloud system to do this much easier.