We are currently working on solving this exact same problem, developer friendly report automation sans visualization. We are entirely focused on solving the reporting problem before tacking visualisation etc. If you are interested in trying out our product, please send me an email at abhyrama at google email service and I will send you the instructions to try it out. The product is out and is being piloted in two large startups which have seen tremendous efficiency improvements in their whole reporting process. We are yet to bring the product public website up.