⚡ Live Sandbox: AI Dev Tool: Rust WebAssembly Edge (2r2m)

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```python
# AI Dev Tool: Hono Cloudflare Workers D1 FastAPI Micro-SaaS Boilerplate
# =====================================================================
# A production-ready, high-performance boilerplate for building micro-SaaS applications
# using Hono, Cloudflare Workers, D1, and FastAPI.

import os
import json
from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import Optional
from cloudflare import Cloudflare

# Initialize the FastAPI application
app = FastAPI()

# Define the database connection settings
DB_HOST = os.environ.get("DB_HOST", "localhost")
DB_PORT = int(os.environ.get("DB_PORT", 5432))
DB_USER = os.environ.get("DB_USER", "postgres")
DB_PASSWORD = os.environ.get("DB_PASSWORD", "postgres")
DB_NAME = os.environ.get("DB_NAME", "mydb")

# Define the Cloudflare API credentials
CF_API_KEY = os.environ.get("CF_API_KEY", "")
CF_API_EMAIL = os.environ.get("CF_API_EMAIL", "")

# Initialize the Cloudflare API client
cf = Cloudflare(email=CF_API_EMAIL, api_key=CF_API_KEY)

# Define the Hono API settings
H

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