Unique identifier linking an entity to the form that created it?

Support
1

What is the best practice for linking an entity to the form that created it?

I register a participant and save a subset of the data about them to an entity.

I fill out a pre-event survey, selecting their name from a list of entities, and it saves the Entity ID - linking that pre-event survey to the entity.

But I don't see anything comparable available by default between the initial registration survey and the entity?

2

I need to do this too. While it would be good to know the best practice, my idea is to use the “once(uuid())” on the form and “save_to” so that it is saved into the entity dataset.