Custom field automatic deletion

Feedback on behalf of Sage 50 UK (Ali Alamiri) - discussed here:

https://teams.microsoft.com/l/message/19:qyxFvEmHoolm5XBFZveNBB3fo5FQ2a9r6dZuafrwnz41@thread.tacv2/1747125574532?tenantId=3e32dd7c-41f6-492d-a1a3-c58eb02cf4f8&groupId=24081f46-5e70-417a-8de8-f07a1e60a2b8&parentMessageId=1747125574532&teamName=Network%20Integration%20Hub&channelName=General&createdTime=1747125574532

Sage 50 UK are syncing custom fields relating to synced invoices. When an invoice is deleted, they suggested that the corresponding custom fields to also be deleted automatically, since they aren't needed any more.