In Postgres, you'd simply have a table with a JSON column for the snapshot-in-type contract. You can then select fields from that JSON for invoices, reports, e

In Postgres, you'd simply have a table with a JSON column for the snapshot-in-type contract. You can then select fields from that JSON for invoices, reports, etc with the arrow operator: https://www.postgresql.org/docs/9.6/static/functions-json.html https://www.postgresql.org/docs/9.6/static/functions-json.ht...