Legacy account migration
What stays
Your Firebase sign-in identity and private session history are preserved. You do not need to register again.
What changes
Legacy sessions are permanently labelled legacy and unranked because the old application could expose targets before submission and its 0–100 scores were not calibrated. The score is retained for reference only.
Why
Excluding old scores protects every viewer and the integrity of the new longitudinal rating. Nothing is silently re-scored or fabricated.