We need a clean, repeatable script that takes a set of separate JSON files—Projects, User profiles, Search, Favourites, Shortlists, Messages and Reviews—and migrates their contents into Firebase. Each section sits in its own file, so the script should loop through multiple smaller files rather than a single dump. A few relationships exist that must be preserved when the data lands in Firebase: Projects tie back to Users, Users connect to Messages and Users relate to Reviews. Company shortlists should relate to each users project. Please use the Firebase Admin SDK so the script can run from the command line. I’d like clear console output showing counts per collection and any skipped or failed documents, plus the option to dry-run for verification before committing writes.