⚡ Live Sandbox: AI Dev Tool: FastAPI Pydantic v2 MicroSaaS

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# Description: A production-ready FastAPI boilerplate with Pydantic v2 for building micro-SaaS applications

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List, Optional
from fastapi.middleware.cors import CORSMiddleware

# Initialize the FastAPI application
app = FastAPI()

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

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

# Define a Pydantic model for the item
class Item(BaseModel):
    """Item model"""
    id: int
    name: str
    description: str
    price: float

# Define a route for getting all users
@app.get("/users", response_model=List[User])
async def get_users():
    """Get all users"""
    # Replace with your database query
    users = [
        User(id=

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