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```python
# AI Dev Tool: FastAPI Pydantic v2 Bluetooth Signal Tracker
# Description: A production-ready micro-SaaS asset for tracking Bluetooth signal strength

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List
import bluetooth
import logging

# Initialize the FastAPI app
app = FastAPI()

# Define the Bluetooth device model
class BluetoothDevice(BaseModel):
    """Bluetooth device model"""
    name: str
    address: str
    signal_strength: int

# Define the Bluetooth signal tracker model
class BluetoothSignalTracker(BaseModel):
    """Bluetooth signal tracker model"""
    devices: List[BluetoothDevice]

# Initialize the Bluetooth signal tracker
bluetooth_signal_tracker = BluetoothSignalTracker(devices=[])

# Define the route to track Bluetooth signal strength
@app.post("/track_bluetooth_signal")
async def track_bluetooth_signal():
    """
    Track Bluetooth signal strength of nearby devices
    """
    try:
        # Discover nearby Bluetooth devices
        nearby_devices = bluetooth.discover_devices(lookup_names=True)
        
        # Initialize an empty list to store the Bluetooth devices
        devices = []
        
        # Iterate over the nearby devices and get their signal strength
        for addr, name

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