⚡ Live Sandbox: AI Dev Tool: FastAPI Pydantic v2 (mbr9)

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# Description: A production-ready FastAPI boilerplate with Pydantic v2 for building micro-SaaS applications
# Author: [Your Name]

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, validator
from typing import Optional
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from sqlalchemy.exc import SQLAlchemyError
from cloudflare import CloudflareAPI

# Initialize FastAPI app
app = FastAPI()

# Initialize Cloudflare API
cf_api = CloudflareAPI()

# Define Pydantic models
class User(BaseModel):
    """User model"""
    id: int
    username: str
    email: str

@validator('email')
    def validate_email(cls, v):
        """Validate email"""
        if '@' not in v:
            raise ValueError('Invalid email')
        return v

class Item(BaseModel):
    """Item model"""
    id: int
    name: str
    description: Optional

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