incremental refresh for Power BI Pro

Good news and this is a good start, but incremental refresh on time cycle is not exactly what we had in mind.... we want to append new data to existing data from sources like CSV. The use case is adding a period's data to an existing model. In other words instead of truncate (delete) and replace data we simply want to tack it onto the table that's already there. Otherwise accumulation of time series data has to be done outside the tool. Of course you don't want to accumulate forever, so being able to selectively delete date ranges of data within specific tables would be a natural companion functional requirement. The only other choice at present is to use another database to accumulate time series data. This is fine but adds complexity for users. Access can only scale to 2GB so it's no good for this, which puts you into the realm of "real" databases, which are too complex for a lot of smaller enterprises. Anyone doing periodic time series updates would benefit from this easy to implement feature... and that means almost any small to medium size business, which i believe is important to success.