⚡ Live Sandbox: AI Dev Tool: Launch HN Vespper YC

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```python
# AI Dev Tool: FastAPI Vespper Starter
# Description: Production-ready FastAPI + Pydantic v2 Micro-SaaS starter boilerplate
# Author: Elite Software Architect

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

# Initialize the logger
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Define the FastAPI application
app = FastAPI(title="Vespper Micro-SaaS", description="Production-ready FastAPI + Pydantic v2 Micro-SaaS starter boilerplate", 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/", response_model=List[User])
async def read_users():
    """Read all users"""
    return users

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