I have a unique use-case that I've been trying to solve. We have a public facing website, where we capture an identifier for a user through an email that contains the user ID in the link. When a user comes to the site through the link, we can capture all future data as being tied to the user through the eVar, but we are unable to tie it to the user in the past if the date range doesn't include when it was set for the user.
Is there a way to insert data into an eVar that was previously unspecified in the past that has now been identified? I've looked at the Data Repair API, and it seems like when it's out of beta could assist here, but I wanted to confirm I wasn't overlooking a simpler approach in the interim.