From c5c99508e2b6be7972a3bf8cdcae51b605a24720 Mon Sep 17 00:00:00 2001
From: Jason Claxton <jason.claxton@defra.gov.uk>
Date: Wed, 31 Jul 2024 11:36:02 +0100
Subject: [PATCH] Update existing return versions when a new one is added
 https://eaflood.atlassian.net/browse/WATER-4568

Having worked out how to convert the information in the return requirements setup session into the various records in the DB (see https://github.com/DEFRA/water-abstraction-system/pull/1137) we now need to deal with how the new record impacts the existing ones.

This PR will extend the persisting logic to deal with changes to the existing return versions.