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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# Description: 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.validators import UUID4
from typing import Optional
from datetime import datetime, timedelta
from jose import jwt, JWTError
from passlib.context import CryptContext
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

# Initialize FastAPI app
app = FastAPI()

# Initialize OAuth2 scheme
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

# Initialize Pydantic models
class User(BaseModel):
    """User model"""
    id: UUID4 = Field(..., description="User ID")
    username: str = Field(..., description="Username")
    email: str = Field(..., description="Email")
    password: str = Field(..., description="Password")

class Token(BaseModel):
    """Token model"""
    access

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