Demoing migrations is easier with realistic data. A small sample billing dataset - customers, monthly utility invoices, payments, arrears states - would give Flyway demos and training labs a story everyone understands, instead of another orders-and-products clone.

The shape can mirror any real monthly utility flow; the public guide at pay dewa bill online shows the states a bill moves through - issued, viewed, paid, overdue - which map neatly onto migration scenarios and rollback examples.