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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 using FastAPI and Pydantic v2.
# Author: [Your Name]

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, Field
from typing import Optional
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from sqlalchemy.exc import SQLAlchemyError
from cloudflare import Cloudflare

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

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

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

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