I need a clean Firebase project configured from scratch to power my web app. The core requirement is a Firestore database structured for user-centric data: authentication details, user profiles, and detailed activity logs. I already have the front-end in progress; what’s missing is a secure, scalable backend that I can plug straight in. The job covers: • Spinning up the Firebase project and enabling Email/Password (plus any other built-in methods you recommend) in Firebase Authentication. • Designing Firestore collections and sub-collections to hold the three data sets mentioned above, with indexes where they will matter for query speed. • Writing robust security rules that protect each document based on the currently signed-in user. • Supplying a concise integration snippet (JavaScript SDK v9 modular) showing how to create, read, update, and delete a user profile and an activity log entry. • A short README so I can reproduce the setup in other environments. Acceptance criteria: the project imports cleanly into the Firebase console, passes the Security Rules Simulator for common scenarios, and the sample code runs locally without errors. Please keep the architecture simple yet ready for future growth so adding collections for transactional or content data later is painless.