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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 fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
from fastapi import status

# Define the FastAPI application
app = FastAPI()

# Define the CORS middleware
origins = [
    "http://localhost:3000",
    "http://localhost:8000",
]

app.add_middleware(
    CORSMiddleware,
    allow_origins=origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# 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

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