This is my cheatsheet, because the Loopback docs aren't the best and I spent way too long puzzling this stuff out.
Consider this a living document. If it helps you, too... great! If you want to make a suggestion, lmk.
It's a PostgreSQL
best-practice to use lowercase names, using snakecase if you need to. ie, my_column_name. You CAN force CamelCase or all uppercase, but it's a really bad idea. Don't.
Also, since I'm using a JSON API client, I've installed the excellent loopback-component-jsonapi to handle the serialization stuff... but that just added additional complexities.