Ask HN: Graduating from gsheets without going full ERP

I have a friend who is outgrowing his Google sheets financial system (many many scripts) and as a former Python developer (been in management recently) I thought “Oh let’s do a proper business rules/state engine” then I remembered how bad I am at UI and how much actual work that would be from scratch.

What’s out there now with a decent drag/drop UI, backed by a real dbms, that has good business rules for a one or two person show that isn’t necessarily a black box? Maybe if ms access had a grandchild that was a prodigy (and wasn’t written by Microsoft TBH)