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```python
# AI Dev Tool: PostgreSQL Vector Search Extension with Rust WebAssembly Edge Function
# ==============================================================================
# This is a production-ready developer code asset that integrates PostgreSQL Vector Search Extension
# with Rust WebAssembly Edge Function for efficient and scalable search functionality.

import os
import json
from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from fastapi.requests import Request
from pydantic import BaseModel
from typing import List, Optional
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from sqlalchemy.exc import SQLAlchemyError
from rust_wasm import EdgeFunction  # Import Rust WebAssembly Edge Function

# Define the PostgreSQL database connection parameters
POSTGRES_USER = os.environ.get("POSTGRES_USER")
POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD")
POSTGRES_HOST = os.environ.get("POSTGRES_HOST")
POSTGRES_PORT = os.environ.get("POSTGRES_PORT")
POSTGRES_DB = os.environ.get("POSTGRES_DB")

# Create a PostgreSQL database engine
engine = create_engine(
    f"postgresql://{POSTGRES_USER}:{POSTGRES_PASSWORD}@{POSTGRES_HOST}:{POSTGRES_PORT}/{POSTGRES_DB}"

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