⚡ Live Sandbox: AI Dev Tool: FastAPI Pydantic v2 (w5jw)

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# Description: Production-ready FastAPI boilerplate with Pydantic v2 and PostgreSQL support
# Author: [Your Name]

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, EmailStr
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, Session
from typing import Optional
from datetime import datetime, timedelta
from jose import jwt, JWTError
from passlib.context import CryptContext

# Initialize FastAPI app
app = FastAPI()

# Define database connection
SQLALCHEMY_DATABASE_URL = "postgresql://user:password@localhost/dbname"
engine = create_engine(SQLALCHEMY_DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Define Pydantic models
class User(BaseModel):
    """User model"""
    id: int
    username: str
    email: EmailStr
    full_name: Optional[str] = None
    disabled: Optional[bool] =

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