While migrating users from the previous service to the new one we discovered that email addresses are not unique in the previous service. This means that one user in the new service might relate to multiple users in the previous service.
This change:
- Adds a new LegacyUser model that can belong to a User. Each LegacyUser model has one old_user_id that corresponds to the user ID in the legacy service.
- Updates the user import service so that we create this association for new users
- Creates a Rake script to backfill the association for existing users
James Rose