Entrypoint is in main.ts.
Routing and serving http requests are done via express.
Each route has its own small controller to deal with the logic of serving the data.
The database layer is handled via prism, see schema file at ./prisma/schema.prisma
#Client
The UI code is written in vue version 3. I've stuck with the new "Composition" API more than the traditional "Options" API. vue-cli is used to compile and was used to generate the project, for the sake of simplicity and speed of development.
There is only really one parent and one child component, ./views/TrafficLights.vue and./components/TrafficLight.vue respectively. The data-fetching is done in the parent and the result of the /status call is displayed in the child.