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```python
# AI Dev Tool: PostgreSQL Vector Search Extension for Next.js Expo Monorepo Boilerplate
"""
PostgreSQL Vector Search Extension for Next.js Expo Monorepo Boilerplate

This tool provides a production-ready PostgreSQL vector search extension for Next.js Expo monorepo boilerplate.
It allows developers to easily integrate vector search functionality into their applications.

## Features
- Supports PostgreSQL vector search
- Compatible with Next.js Expo monorepo boilerplate
- Includes example usage and documentation

## Requirements
- PostgreSQL 12+
- Next.js 12+
- Expo 44+
- Node.js 14+
"""

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

# PostgreSQL connection settings
PG_HOST = os.environ.get('PG_HOST', 'localhost')
PG_PORT = os.environ.get('PG_PORT', 5432)
PG_DATABASE = os.environ.get('PG_DATABASE', 'database')
PG_USER = os.environ.get('PG_USER', 'user')
PG_PASSWORD = os.environ.get('PG_PASSWORD', 'password')

# Create a PostgreSQL connection
def create_connection():
    """
    Create a PostgreSQL connection.

Returns:
        conn (psycopg2 connection object): PostgreSQL connection object
    """
    try:

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