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```python
# AI Dev Tool: PostgreSQL Vector Search Extension with Rust WebAssembly Edge Function
# Description: A production-ready developer code asset for integrating PostgreSQL vector search with Rust WebAssembly edge functions.

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

# PostgreSQL connection settings
POSTGRES_HOST = os.environ.get('POSTGRES_HOST')
POSTGRES_DB = os.environ.get('POSTGRES_DB')
POSTGRES_USER = os.environ.get('POSTGRES_USER')
POSTGRES_PASSWORD = os.environ.get('POSTGRES_PASSWORD')

# Rust WebAssembly edge function settings
WASM_MODULE = os.environ.get('WASM_MODULE')
WASM_FUNCTION = os.environ.get('WASM_FUNCTION')

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

    Returns:
        psycopg2.Connection: The PostgreSQL connection object.
# ... full runnable version includes tests & documentation