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

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

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, ValidationError, 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 IntegrityError
from cloudflare import Cloudflare

# Initialize FastAPI app
app = FastAPI()

# Initialize Cloudflare worker
cf = Cloudflare()

# Initialize PostgreSQL database connection
SQLALCHEMY_DATABASE_URL = "postgresql://user:password@host:port/dbname"
engine = create_engine(SQLALCHEMY_DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

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

@validator('

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