I need an Android-only APK that runs quietly in the background, catches every single incoming SMS, forwards it to a second phone number, and then stores the complete message payload in Firebase. The forwarding number must be pulled automatically from a preset list that I can update before compilation, so the user never needs to type or choose anything. Key expectations • The app wakes on every message, handles Doze / battery-optimization constraints, and survives device reboots so forwarding is never missed. • Forwarding applies to all incoming messages without filtering. • Every message—sender, body, timestamp—lands in my chosen Firebase instance (Realtime Database or Firestore; I’m flexible as long as retrieval is simple). • The APK should appear lightweight and unobtrusive; only a minimal settings screen is acceptable if needed for runtime permissions. Deliverables 1. Signed installable APK. 2. Full Android Studio project with well-commented Java or Kotlin code. 3. Brief README describing Firebase setup, where to edit the preset number list, and how to build the release variant. If you have questions about specific Android versions, Firebase rules, or silent operation strategies, let me know so we can lock them down before you start.