Big oops from me!
I was originally planning on using Redis really. No much reasons though, just because I use it in my current job and it is used by a lot of companies.
Anyway, I googled my way through the process of developing the project, and discovered ETS unintentionally. Being a half-hearted man, I quickly decided to try it out without remembering to update my design XD
Thanks for the reminder! I will do some more research til I can explain clearly why to choose ETS, and update the README ASAP!
BTW thanks for the compliment on my documentary. As a non-native speaker, I’m still seeking ways to improve my English especially in writing, so your noticing really means a lot to me 
