Add Db schema

[IperGiove]

This PR introduces the database schema as a visual diagram and a DBML file.

Changes

• Added schema.png to src/resources/.data/.
• Added schema.dbml to src/resources/.data/.
• Updated README.md to include the database schema image.

[oso-prs]

Validation Results

✅ Good to go as long as status checks pass

commit 98151abd37b6e973e1aa7e76fb9ba73d2e59db85

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[ryscheng]

I really like this idea!
Though I would much prefer that we programmatically generate it, rather than have to try to keep it consistent.

Is there a library that will convert json schema to dbml, which we can add as a build step to the package.json?

[IperGiove]

It makes sense to automate the process, but unfortunately, DBML is designed for SQL and doesn't have a JSON parser. I'm not sure if there is a visualizer available that can work with a JSON file

[ryscheng]

I'm just concerned that anything that's not programmatically generated will get out of date and will be a burden to keep up-to-date.

How about using something like this instead?
https://www.npmjs.com/package/@adobe/jsonschema2md