What's the deal with Arthur Whitney's Shakti these days? The download has been gone for a year or two at this point.
If you have to make the choice between Shakti or some timeseries db + Python, Shakti would be a very suspicious choice. And I say this as someone who likes K and strongly dislikes Python.
Maybe they already found all the high paying customers and now there's nobody left that will pay that much? No idea.