create_user wrote the profile with .add() (random doc ID). On first login the
FlutterFlow app looks for users/{uid}, doesn't find it, and creates a second,
bare doc - so every console-created user ended up duplicated, and devices
assigned in the console pointed at the doc the app never reads.
Now the profile is written to users/{uid} with created_time set, and the email
is lowercased to match what Firebase Auth stores. If the Firestore write
fails, the just-created Auth account is deleted so no orphan is left.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
bonaminandClaude Opus 5.5
c1df3b5aa3