Adding a column to an influxDB database

I have an existing database with stock prices indexing with timestamps. However, the price is too much noisy. I've succeeded to find a way to smooth the price database with Savitzky-Golay filter. I need someone to create a python script which will have as purpose to add a column to my database which will be called 'smooth_midprice'. You can see what it looks like by the picture I attach to that question which is called SavGol.png. You can find the [login to view URL] file as well. Be aware that the file will have to process 90 million rows. So you will need to deal with ram consumption issue and multithreadings.