Architecture questions: Angular App, DB and Wordpress

Hello do community. I’m considering building an app on do, and after having read some docs I have some questions considering the architecture and best services to use.

In general, my app will have an Angular + Ionic based application, connected to a backend DB (I’d prefer a graph DB, but I noticed do doesn’t offer a managed Graph DB, so it’ll be a relational DB).

Also, there will be a Wordpress + WooCommerce front-end for customers to work with, with the Angular app EMBEDDED within a Wordpress PAGE (for authorized users only).

1. In my understanding, the better option for a DB + Angular deployment is an App, while the WordPress recommended way is a Droplet. Since I need both Wordpress and Angular app to be jointly provisioned, how would I go about combining all three elements on a single platform/service (the Angular app, its DB and the Wordpress site)? Can I have the Angular app + Wordpress site served by an App, or must they both reside within a Droplet? or else?
2. I will need to listen for http requests triggered from Wordpress webhooks, to mutate the Angular app’s DB (e.g. when a new order is placed with WooCommerce, I need to update that I have a new customer in the app’s DB). What should be my considerations in choosing between implementing a serverless Function, vs. an App Platform Service to capture http requests and update the DB?
3. As for the Angular app communicating with the DB - would you suggest an http-based communications with a Service/Function in between, or should I use some node package to directly hit the DB using its connection string and submitting queries (thinking here MySQL over port 3306 client-server communications)?

I believe DO should have some good offering to set this all up technically, anticipating your guidance and advise! Thanks, Mor