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```python
# AI Dev Tool: Secure Micro-SaaS Boilerplate with FastAPI and Pydantic v2
# =====================================================================
# This production-ready boilerplate provides a secure and efficient way to
# build micro-SaaS applications using FastAPI and Pydantic v2. It includes
# features such as authentication, authorization, and input validation.

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, validator
from pydantic.errors import ListError
from typing import List, Optional
from datetime import datetime, timedelta
import jwt
import os

# Define the application
app = FastAPI()

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

# Define the user model
class User(BaseModel):
    """User model"""
    username: str
    email: str
    full_name: Optional[str] = None
    disabled: Optional[bool] = None

# Define the token model
class Token(BaseModel):
    """Token model"""
    access_token: str
    token_type: str

# Define the token data model
class TokenData(BaseModel):

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