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📝 Editable Code Sandbox

```python
# AI Dev Tool: Edge Function API Gateway with PostgreSQL Vector Search Extension
# ==============================================================================
# This is a production-ready developer code asset for building a high-performance
# Edge Function API Gateway with PostgreSQL Vector Search Extension using Hono,
# Cloudflare Workers, and FastAPI.

import os
import uvicorn
from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import List, Optional
from hono import Hono
from cloudflare import WorkersKV
from psycopg2 import connect
from psycopg2.extras import DictCursor

# Define the FastAPI app
app = FastAPI()

# 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 KV settings
WORKERS_KV_NAMESPACE = os.environ.get("WORKERS_KV_NAMESPACE")
WORKERS_KV_API_TOKEN = os.environ.get("WORKERS_KV_API_TOKEN")

# Define the Hono settings
HONO_HOST = os.environ.get("HONO_HOST")

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