⚡ Live Sandbox: AI Dev Tool: FastAPI Pydantic v2 (bp8j)

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

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, EmailStr
from pydantic.errors import ListError
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
from sqlalchemy.exc import SQLAlchemyError
from cloudflare import CloudflareAPI
from hono import HonoAPI

# Initialize FastAPI app
app = FastAPI()

# Initialize OAuth2 scheme
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

# Initialize database engine
engine = create_engine("postgresql://user:password@host:port/dbname")
Base = declarative_base()

# Define database models
class User(Base):
    """User database model"""
    __tablename__ = "users"
    id = Column(Integer, primary_key=True)
    username = Column(String, unique

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