Fix AI Persona Generation Bug in Flutter Book App (Firebase + OpenAI Integration)

I have an existing Flutter mobile app where users create profiles and add books they've read. Based on a user's added books, our backend calls an AI model (OpenAI API) to automatically generate a short ""persona summary"" that helps other users quickly understand that person when viewing their profile. This feature was working correctly before, but has recently stopped generating personas — no new personas are being created for updated profiles. We need a Flutter/Firebase developer with AI API integration experience to investigate and fix the issue. Scope of work: Review existing Flutter app code and Firebase Cloud Functions (or backend) handling the AI persona generation flow Identify why the OpenAI API call/persona generation is failing or not triggering Fix the bug and confirm personas generate correctly on new and existing profiles Provide a short summary of the root cause and the fix Requirements: Strong experience with Flutter and Dart Firebase (Firestore, Cloud Functions, Authentication) Experience integrating OpenAI/ChatGPT APIs into mobile apps Ability to debug existing codebases quickly"