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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Starter
# ================================================
# A production-ready starter boilerplate for building micro-SaaS applications
# using FastAPI, Pydantic v2, and Cloudflare Workers.

from fastapi import FastAPI, Depends, HTTPException
from pydantic import BaseModel, validator
from cloudflare import WorkersKV
from typing import Optional
from datetime import datetime

# Define the application
app = FastAPI()

# Define the Workers KV namespace
kv = WorkersKV(namespace="micro-saas")

# Define the user model
class User(BaseModel):
    id: int
    name: str
    email: str

@validator("email")
    def validate_email(cls, v):
        """Validate the email address"""
        if "@" not in v:
            raise ValueError("Invalid email address")
        return v

# Define the authentication model
class Auth(BaseModel):
    access_token: str
    expires_at: datetime

# Define the authentication dependency
def get_auth(auth: Optional[Auth] = None):
    """Get the authentication object"""
    if auth is None:
        raise HTTPException(status_code=401, detail="Unauthorized")
    return auth

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