I don't think it should go in an entity class, I thought it could stay in
`ProfileProcess` though.  However I did not see that it was used elsewhere
as the diff only showed one file where the method was deleted.

If we want to use the `ModelHelper` class, then as a matter of cleanup,
methods that are already in the API model classes (`Conference`) which
translate back and forth b/w API & DB entities should also be moved to
model helper in my opinion.  That doesn't have to happen in this PR, but
could be refactored in a separate task.  Thoughts?