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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# =====================================================
# This is a production-ready developer code asset for building micro-SaaS applications
# using FastAPI, Pydantic v2, and Cloudflare Workers.

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List, Optional
import json
import os

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

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

class Item(BaseModel):
    """Item model"""
    id: int
    name: str
    description: str
    price: float

# Define the in-memory data store
users: List[User] = []
items: List[Item] = []

# Define the API endpoints
@app.get("/users/")
async def read_users():
    """Read all users"""
    return users

@app.get("/users/{user

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