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```python
# AI Dev Tool: PostgreSQL Vector Search Extension with FastAPI and Hono
# ===============================================================
# This is a production-ready developer code asset for building a scalable and performant API
# with PostgreSQL Vector Search Extension 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

# Define the PostgreSQL connection parameters
POSTGRES_HOST = "localhost"
POSTGRES_DB = "vector_search"
POSTGRES_USER = "postgres"
POSTGRES_PASSWORD = "password"

# Define the Hono Cloudflare Workers D1 Starter parameters
HONO_API_KEY = "YOUR_HONO_API_KEY"
HONO_API_SECRET = "YOUR_HONO_API_SECRET"

# Create a FastAPI app
app = FastAPI()

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

# Define a Pydantic model for the search query
class SearchQuery(BaseModel):
    query: str
    limit: int = 10

# Define a

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