⚡ Live Sandbox: AI Dev Tool: AGENTSmd AINative SaaS (ltus)

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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

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

# Define the FastAPI application
app = FastAPI()

# Define the OAuth2 scheme
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="login")

# Define the user model
class User(BaseModel):
    """User model"""
    id: int = Field(..., description="User ID")
    username: str = Field(..., description="Username")
    email: str = Field(..., description="Email")
    password: str = Field(..., description="Password")

# Define the token model
class Token(BaseModel):
    """Token model"""
    access_token: str = Field(..., description="Access token")
    token_type: str = Field(..., description="Token type")

# Define the token

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