Mixpanel User Identity Update Script: Confirmation and Suggestions Needed

Script to update Mixpanel user identity for historical data • Find all device IDs associated with each event-level attribute userid • Identify the oldest device ID for each user • Link all device IDs to the canonical user ID (which is the event-level attribute userid) • Set the user profile using the oldest device's profile data for attributes like initial UTM source, etc. please confirm if this script flow works or if anyone has other suggestions