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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS for Wearable Device Data Integration
# Description: Production-ready API integration wrapper for wearable device data
# Author: Elite Software Architect and Micro-SaaS Developer

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List, Optional
import uvicorn
import sqlite3
from sqlite3 import Error

# Define the FastAPI application
app = FastAPI(title="Wearable Device Data API",
              description="API for wearable device data integration",
              version="1.0.0")

# Define the Pydantic model for wearable device data
class WearableDeviceData(BaseModel):
    """Wearable device data model"""
    id: int
    user_id: int
    ketone_level: float
    blood_sugar_level: float
    timestamp: str

# Define the database connection function
def create_connection(db_file):
    """Create a database connection to the SQLite database"""
    conn = None
    try:
        conn = sqlite3.connect(db_file)
        return conn
    except Error as e:
        print(e)

# Define the function to insert wearable device data into the database
def insert_w

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