⚡ Live Sandbox: AI Dev Tool: Rust WebAssembly Edge Function

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```python
# AI Dev Tool: Hono Cloudflare Workers D1 Starter with FastAPI Pydantic v2 Micro-SaaS
# Production Starter Boilerplate for Edge Function and PostgreSQL Vector Search Extension

import os
import json
from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import Optional
import psycopg2
import psycopg2.extras
from psycopg2 import Error
from cloudflare import Cloudflare

# Define the FastAPI application
app = FastAPI()

# Define the Pydantic model for the API request body
class RequestBody(BaseModel):
    query: str
    limit: Optional[int] = 10

# Define the PostgreSQL connection settings
POSTGRES_HOST = os.environ.get('POSTGRES_HOST')
POSTGRES_DB = os.environ.get('POSTGRES_DB')
POSTGRES_USER = os.environ.get('POSTGRES_USER')
POSTGRES_PASSWORD = os.environ.get('POSTGRES_PASSWORD')

# Define the Cloudflare Workers settings
CLOUDFLARE_ACCOUNT_ID = os.environ.get('CLOUDFLARE_ACCOUNT_ID')
CLOUDFLARE_API_TOKEN = os.environ.get('CLOUDFLARE_API_TOKEN')

# Initialize the PostgreSQL connection
def init_postgres

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