⚡ Live Sandbox: AI Dev Tool: PostgreSQL Vector Search Extension

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```python
# AI Dev Tool: Edge AI-Powered Micro-SaaS Boilerplate
# Combines Hono, Cloudflare Workers, D1, FastAPI, Pydantic v2, and PostgreSQL Vector Search Extension

import os
import json
from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import List, Optional
from cloudflare import Worker, D1
from hono import HonoAPI
from postgresql import VectorSearchExtension

# Define the FastAPI application
app = FastAPI()

# Define the Pydantic models
class User(BaseModel):
    id: int
    name: str
    email: str

class Item(BaseModel):
    id: int
    name: str
    description: str

# Initialize the Hono API
hono_api = HonoAPI()

# Initialize the Cloudflare Worker and D1
worker = Worker()
d1 = D1()

# Initialize the PostgreSQL Vector Search Extension
vector_search = VectorSearchExtension()

# Define the API endpoints
@app.get("/users/")
async def read_users():
    """
    Read all users from the database.
    
    Returns:
    List[User]: A list

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