Exploded axonometric · Diagram Design
Three layers pulled apart along one axis. The middle one carries the product, and the other two can be swapped.
The headline
Swapping the database is a migration. Swapping the interface is a redesign. Rewriting the logic is a different product, so that layer gets the accent.
A stack this small reads at a glance. Past five parts the explode gets tall and the labels crowd; split it into two figures.