I’ve seen Martin Fowler call something like what you’re describing the Strangler Fig pattern https://martinfowler.com/bliki/StranglerFigApplication.html https:

I’ve seen Martin Fowler call something like what you’re describing the Strangler Fig pattern https://martinfowler.com/bliki/StranglerFigApplication.html https://martinfowler.com/bliki/StranglerFigApplication.html