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```python
# AI Dev Tool: PostgreSQL Vector Search Extension with Hono Cloudflare Workers D1 Starter
# Description: A production-ready developer code asset for building scalable and secure vector search APIs
# Category: Production Starter Boilerplate

import os
import json
from typing import Dict, List
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 FastAPI app
app = FastAPI()

# Initialize Hono Cloudflare Workers D1 Starter
hono = Hono()

# Define PostgreSQL connection settings
POSTGRES_HOST = os.environ.get("POSTGRES_HOST", "localhost")
POSTGRES_PORT = os.environ.get("POSTGRES_PORT", 5432)
POSTGRES_USER = os.environ.get("POSTGRES_USER", "postgres")
POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD", "postgres")
POSTGRES_DB = os.environ.get("POSTGRES_DB", "postgres")

# Define PostgreSQL vector search extension settings
VECTOR_SEARCH_TABLE = os.environ.get("VECTOR_SEARCH_TABLE", "vector_search")
VECTOR_SEARCH_COLUMN

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