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Preview Code

```python
# AI Dev Tool: PostgreSQL Vector Search Extension with Rust WebAssembly Edge Function
# ==============================================================================
# This code asset provides a production-ready developer tool for integrating 
# PostgreSQL vector search extension with Rust WebAssembly edge function.

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

# PostgreSQL database connection settings
DB_HOST = os.environ.get('DB_HOST', 'localhost')
DB_NAME = os.environ.get('DB_NAME', 'vector_search_db')
DB_USER = os.environ.get('DB_USER', 'vector_search_user')
DB_PASSWORD = os.environ.get('DB_PASSWORD', 'vector_search_password')

# Rust WebAssembly edge function settings
EDGE_FUNCTION_URL = os.environ.get('EDGE_FUNCTION_URL', 'https://example.com/edge-function')

def create_postgresql_connection() -> psycopg2.Connection:
    """
    Creates a connection to the PostgreSQL database.

    Returns:
# ... full runnable version includes tests & documentation