⚡ Live Sandbox: AI Dev Tool: Hono Cloudflare Workers D1

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```python
# AI Dev Tool: Edge-AI Powered Vector Search API Integration Wrapper
# =====================================================================
# This is a production-ready API integration wrapper for PostgreSQL Vector Search Extension
# using FastAPI, Pydantic v2, and Cloudflare Workers. It provides a robust and scalable
# solution for building AI-native SaaS applications.

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List, Optional
import psycopg2
import json
from cloudflare import WorkersKV

# Define the Vector Search API model
class VectorSearchModel(BaseModel):
    """Vector Search API model"""
    query: str
    limit: Optional[int] = 10

# Define the PostgreSQL Vector Search Extension connection settings
POSTGRESQL_HOST = "localhost"
POSTGRESQL_PORT = 5432
POSTGRESQL_USER = "username"
POSTGRESQL_PASSWORD = "password"
POSTGRESQL_DB = "database"

# Define the Cloudflare Workers KV namespace
CLOUDFLARE_WORKERS_KV_NAMESPACE = "vector_search_namespace"

# Create a FastAPI application instance
app = FastAPI()

# Create a PostgreSQL connection pool
def create_postgresql_connection():
    """Create a PostgreSQL connection pool"""
    try:

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