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```python
# AI Dev Tool: PostgreSQL Vector Search Extension with Next.js Expo Monorepo Boilerplate
# =====================================================================================
# This is a high-demand, production-ready developer code asset that integrates PostgreSQL
# Vector Search Extension with Next.js Expo Monorepo Boilerplate.

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

# PostgreSQL Vector Search Extension Configuration
# ---------------------------------------------
POSTGRESQL_HOST = os.environ.get('POSTGRESQL_HOST', 'localhost')
POSTGRESQL_PORT = os.environ.get('POSTGRESQL_PORT', 5432)
POSTGRESQL_USER = os.environ.get('POSTGRESQL_USER', 'postgres')
POSTGRESQL_PASSWORD = os.environ.get('POSTGRESQL_PASSWORD', 'postgres')
POSTGRESQL_DB = os.environ.get('POSTGRESQL_DB', 'postgres')

# Create a connection to the PostgreSQL database
def create_connection():
    """Create a connection to the PostgreSQL database."""
    try:
        connection = psycopg2.connect(
            host=POSTGRESQL_HOST,
            port=POSTGRESQL_PORT,
            user=POSTGRESQL_USER,
            password=POSTGRESQL_PASSWORD,
            database=POSTGRESQL_DB

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