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

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```python
# AI Dev Tool: Hono Cloudflare Workers D1 Starter with FastAPI Pydantic v2 Micro-SaaS
# ==============================================================================
# This is a production-ready developer code asset for building high-performance
# micro-SaaS applications using Hono Cloudflare Workers, D1 database, FastAPI, and Pydantic v2.

import os
import uvicorn
from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel, Field
from cloudflare import WorkersKV
from d1 import D1Database

# Define the FastAPI application
app = FastAPI(title="Hono Cloudflare Workers D1 Starter",
              description="A production-ready micro-SaaS application",
              version="1.0.0")

# Define the Pydantic model for the user data
class UserData(BaseModel):
    """User data model"""
    id: int = Field(..., description="User ID")
    name: str = Field(..., description="User name")
    email: str = Field(..., description="User email")

# Initialize the Cloudflare Workers KV store
kv = WorkersKV(namespace="user-data")

# Initialize the D1 database
d1 = D1Database(os

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