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Improvement - Use a database migration tool
Background
It could be useful to use a database migration tool for the gateway like https://flywaydb.org/. Adding tables would be much easier to audit / run in production if we had a tool like this. Migrations could run before the application starts up for example and since they're checked into version control they can be audited and approved with the normal workflow.
TODO: Add more details about what a migration tool is, and more example here about how they work