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```python
# AI Dev Tool: FastAPI Micro-SaaS Boilerplate
# Description: A production-ready FastAPI + Pydantic v2 Micro-SaaS boilerplate
# Author: Elite Software Architect

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List, Optional
from fastapi.responses import JSONResponse
from fastapi.requests import Request
from fastapi.middleware.cors import CORSMiddleware

# Initialize FastAPI app
app = FastAPI()

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

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

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

# Define routes
@app.get("/users/")
async def read_users():
    """
    Get all users
    """
    # Replace with actual database query
    users = [
        User(id=1, name="John Doe", email="john@example.com"),
        User(id=2, name="Jane

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