Comment by brylie

I may misunderstand your comment.

That said, where I work (MaaS Global) we have a production PostgreSQL database hosted on AWS Relational Database Service (RDS):

https://aws.amazon.com/rds/postgresql/

We connect to the AWS RDS instance in our lambda functions using an ES library called knex.js and some environment variables to store the DB credentials:

https://knexjs.org/