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```python
# AI Dev Tool: PostgreSQL Vector Search Extension with FastAPI and Hono
# =====================================================================
# This is a production-ready developer code asset that integrates PostgreSQL Vector Search Extension
# with FastAPI and Hono Cloudflare Workers D1 Starter.

from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from fastapi.requests import Request
from pydantic import BaseModel
from typing import List, Optional
import psycopg2
import json
from hono import Hono

# PostgreSQL Vector Search Extension configuration
POSTGRES_HOST = "localhost"
POSTGRES_DB = "vector_search"
POSTGRES_USER = "postgres"
POSTGRES_PASSWORD = "password"

# Hono Cloudflare Workers D1 Starter configuration
HONO_API_KEY = "YOUR_HONO_API_KEY"
HONO_API_SECRET = "YOUR_HONO_API_SECRET"

# Initialize FastAPI app
app = FastAPI()

# Initialize Hono client
hono = Hono(api_key=HONO_API_KEY, api_secret=HONO_API_SECRET)

# Define a Pydantic model for vector search queries
class VectorSearchQuery(BaseModel):
    query: str
    vector: List[float]

# Define a Pydantic model for vector search results

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