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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.

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List, Optional
from datetime import datetime

app = FastAPI()

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

# Define a Pydantic model for the product
class Product(BaseModel):
    """Product model"""
    id: int
    name: str
    price: float

# Define a Pydantic model for the order
class Order(BaseModel):
    """Order model"""
    id: int
    user_id: int
    product_id: int
    quantity: int
    order_date: datetime

# In-memory data store for demonstration purposes
users: List[User] = []
products: List[Product] = []
orders: List[Order] = []

# Create a new user
@app.post("/users/")
async def create_user(user: User):
    """Create

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