⚡ Live Sandbox: AI Dev Tool: A Modern Web App

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# Description: A production-ready starter boilerplate for building modern web applications
#              using FastAPI, Pydantic v2, and a micro-SaaS architecture.

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List, Optional
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

# Define the database connection URL
DATABASE_URL = "sqlite:///example.db"

# Create a database engine
engine = create_engine(DATABASE_URL)

# Create a configured "Session" class
Session = sessionmaker(bind=engine)

# Create a base class for declarative class definitions
Base = declarative_base()

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

# Define a Pydantic model for the item
class Item(BaseModel):
    """Item model"""
    id: int
    title: str
    description: str
    price: float
    owner_id: int

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