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```python
# AI Dev Tool: PostgreSQL Vector Search Extension with Hono Cloudflare Worker D1 Starter
# Description: A production-ready developer code asset for building scalable and efficient vector search functionality
# using PostgreSQL and Hono Cloudflare Worker D1 Starter.

import os
import json
from typing import List, Dict
from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from fastapi.requests import Request
from fastapi.middleware.cors import CORSMiddleware
from hono import Hono
from psycopg2 import connect
from psycopg2.extras import DictCursor

# Initialize the FastAPI application
app = FastAPI()

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

# Initialize the Hono Cloudflare Worker D1 Starter
hono = Hono()

# PostgreSQL database connection settings
DB_HOST = os.environ.get("DB_HOST")
DB_PORT = os.environ.get("DB_PORT")
DB_USER = os.environ.get("DB_USER")
DB_PASSWORD = os.environ.get("DB_PASSWORD")
DB_NAME = os.environ.get("DB_NAME")

# Establish a connection to the

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