⚡ Live Sandbox: AI Dev Tool: Rust WebAssembly Edge (777h)

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```python
# AI Dev Tool: Edge Function API Gateway with PostgreSQL Vector Search Extension
# ==============================================================================
# This is a production-ready developer code asset that combines the power of 
# Cloudflare Workers, Hono, and PostgreSQL Vector Search Extension to create a 
# scalable and efficient API gateway for edge functions.

import os
import json
from typing import Dict, List
from pydantic import BaseModel
from hono import Hono
from cloudflare import WorkersKV
from psycopg2 import connect
from psycopg2.extras import DictCursor

# Define the 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')

# Define the Cloudflare Workers KV settings
WORKERS_KV_NAMESPACE = os.environ.get('WORKERS_KV_NAMESPACE')

# Define the Hono settings
HONO_API_KEY = os.environ.get('HONO_API_KEY')
HONO_API_SECRET = os.environ.get('HONO_API_SECRET')

# Define the PostgreSQL Vector Search Extension settings
VECTOR_SEARCH_EXTENSION = os.environ.get('VECTOR_SEARCH_EXTENSION')

class VectorSearchQuery(BaseModel):

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