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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# Description: A production-ready starter boilerplate for building micro-SaaS applications with FastAPI and Pydantic v2

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 uuid import UUID
from datetime import datetime

# Define the application
app = FastAPI(
    title="FastAPI Pydantic v2 Micro-SaaS Boilerplate",
    description="A production-ready starter boilerplate for building micro-SaaS applications",
    version="1.0.0"
)

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

# Define the user model
class User(BaseModel):
    id: UUID4 = Field(..., description="The unique identifier of the user")
    username: str = Field(..., description="The username of the user")
    email: str = Field(..., description="The email address of the user")
    password: str = Field(..., description="The password of the user

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