Switch to a real DB

[5HT2]

I'm having way too many issues with redis persistence, and honestly, a beats key in a redisjson database with 265020 values (it is literally a json array with 265,020 values in the root key) is not the best way to go about this. This is exactly the sort of thing SQL is for and I wish I knew that when I decided to write this project 2 years ago, so it's time to fix it (after Christmas, ideally).