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```python
# AI Dev Tool: Cloudflare Worker Hono API Template with PostgreSQL Vector Search Extension
# =====================================================================================
# This is a production-ready starter boilerplate for building high-performance APIs
# using Cloudflare Workers, Hono, and PostgreSQL Vector Search Extension.

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

# PostgreSQL connection settings
PG_HOST = os.environ.get('PG_HOST')
PG_DATABASE = os.environ.get('PG_DATABASE')
PG_USER = os.environ.get('PG_USER')
PG_PASSWORD = os.environ.get('PG_PASSWORD')

# Create a PostgreSQL connection pool
def create_pg_connection() -> connect:
    """Create a PostgreSQL connection pool"""
    return connect(
        host=PG_HOST,
        database=PG_DATABASE,
        user=PG_USER,
        password=PG_PASSWORD,
        cursor_factory=DictCursor
    )

# Define the Hono API
app = Hono()

# Define the PostgreSQL Vector Search Extension API endpoint
@app.get('/search')
async def search(request: Dict) -> Dict:
    """Search for similar vectors in the PostgreSQL database"""
    # Get the search query from the

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