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```python
# AI Dev Tool: PostgreSQL Vector Search Extension Boilerplate
# Description: A production-ready boilerplate for building vector search applications with PostgreSQL

import os
import psycopg2
from psycopg2 import Error
from typing import List, Dict

# PostgreSQL connection settings
DB_HOST = os.environ.get('DB_HOST', 'localhost')
DB_NAME = os.environ.get('DB_NAME', 'vector_search')
DB_USER = os.environ.get('DB_USER', 'postgres')
DB_PASSWORD = os.environ.get('DB_PASSWORD', 'password')

# Create a PostgreSQL connection
def create_connection():
    """
    Creates a connection to the PostgreSQL database.
    
    Returns:
    connection (psycopg2.connection): A connection object to the PostgreSQL database.
    """
    try:
        connection = psycopg2.connect(
# ... full runnable version includes tests & documentation