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```python
# AI Dev Tool: Cloudflare Worker PostgreSQL Vector Search Extension
# =============================================================
# This is a production-ready developer code asset that integrates 
# Cloudflare Worker with PostgreSQL Vector Search Extension.

import os
import json
from typing import Dict, List
from cloudflare import Worker, D1
from psycopg2 import connect
from psycopg2.extras import DictCursor

# Define the PostgreSQL connection parameters
PG_HOST = os.environ.get('PG_HOST')
PG_PORT = os.environ.get('PG_PORT')
PG_DBNAME = os.environ.get('PG_DBNAME')
PG_USER = os.environ.get('PG_USER')
PG_PASSWORD = os.environ.get('PG_PASSWORD')

# Define the Cloudflare Worker D1 database name
D1_DBNAME = os.environ.get('D1_DBNAME')

# Create a Cloudflare Worker
worker = Worker()

# Create a PostgreSQL connection
def create_pg_connection() -> connect:
    """
    Create a PostgreSQL connection.
    
    Returns:
    connect: A PostgreSQL connection object.
    """
    try:
        return connect(
            host=PG_HOST,
            port=PG_PORT,
            dbname=PG_DBNAME,
            user=PG_USER,
            password=PG_PASSWORD
        )
    except Exception as e:

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