⚡ Live Sandbox: AI Dev Tool: Retraction The App Store

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# Description: A production-ready boilerplate for building micro-SaaS applications with FastAPI and Pydantic v2.

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()

# Define the Pydantic model for the user
class User(BaseModel):
    """User model."""
    id: int
    name: str
    email: str

# Define the Pydantic model for the QR code
class QRCode(BaseModel):
    """QR code model."""
    id: int
    data: str
    dithered: bool

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

# Create the users table
def create_users_table(conn):
    """Create the users table."""
    sql = """CREATE TABLE IF NOT EXISTS users

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