Spike: Try technology stack for database (PostgresQL on AWS RDS)

[pietrop]

Following from investigation into db tech stack #11

• spin up/ setup a dev db (local or on AWS - TBC)
• connect to it
• do a schema migration to create some tables
• add data to the database
• retrieve data from the database

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Stretch goals (can be separate issue)

• consider wrapping this logic into a "wrapper class" to encapsulate and separate concerns within the application business logic
• is there a convenient way to seed a test database with dummy data?

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Note, you are welcome to use the schema from this issue #6 (comment) for the purpose of trying stuff out, provided that is understood that defining the schema of the database is a separate ADR/issue.