Interesting lots of people had the same idea. I have done something similar for my home network using an Ethernet connected RaspberryPI dedicated to this task u

Interesting lots of people had the same idea. I have done something similar for my home network using an Ethernet connected RaspberryPI dedicated to this task using a cronjob, the speedtest-cli JSON format, MongoDB and just some JS graphs. - very rudimentary. One thing I found very important was to plot the scatter of PING vs. Download speed (my Upload is super stable). Then I created the probability density function of that (using KDE) and used it to get a better deal from my network provider - I could prove they were selling me a slower network most of the time - they now allocate 70Mb/s on a 50Mb/s deal so just that they hit the 50Mb/s most of the time. It also allowed me to clearly identify some outlier situations where my network suddenly became 'bad' and I could show evidence of it being bad over time. Certainly a project that should see more traction!