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

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel, validator
from typing import Optional
import uvicorn
import logging

# Initialize the FastAPI application
app = FastAPI()

# Define a Pydantic model for user data
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 a route for creating a new user
@app.post("/users/")
async def create_user(user: User):
    """Create a new user"""
    try:
        # Simulate a database operation
        logging.info(f"Creating user: {user.name} ({user.email})")
        return user
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

# Define a route for retrieving a user by ID
@app.get

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