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

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# =============================================
# This is a production-ready FastAPI boilerplate for building micro-SaaS applications.
# It includes Pydantic v2 for data validation, authentication, and authorization.

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, EmailStr
from typing import Optional
from passlib.context import CryptContext
from datetime import datetime, timedelta
import jwt

# Define the FastAPI application
app = FastAPI()

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

class UserInDB(User):
    """User model with password"""
    password: str

class Token(BaseModel):
    """Token model"""
    access_token: str
    token_type: str

class TokenData(BaseModel):
    """Token data model"""
    username: Optional[str] = None

# Define the authentication and authorization
oauth2_scheme

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