⚡ Live Sandbox: AI Dev Tool: PostgreSQL Vector Search (60y5)

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Starter
# Description: Production-ready FastAPI starter boilerplate with Pydantic v2, 
#              Hono Cloudflare Workers D1 integration, and PostgreSQL Vector Search Extension

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, EmailStr
from typing import Optional
from hono import Hono
from cloudflare import WorkersKV
import psycopg2
from psycopg2 import extras
import os

# Initialize FastAPI app
app = FastAPI()

# Initialize Hono client
hono = Hono(api_key=os.environ['HONO_API_KEY'])

# Initialize Cloudflare Workers KV
workers_kv = WorkersKV(namespace=os.environ['CLOUDFLARE_NAMESPACE'])

# Initialize PostgreSQL connection
conn = psycopg2.connect(
    host=os.environ['POSTGRES_HOST'],
    database=os.environ['POSTGRES_DB'],
    user=os.environ['POSTGRES_USER'],
    password=os.environ['POSTGRES_PASSWORD']
)

# Define Pydantic models
class User(BaseModel):
    id: int
    email: EmailStr
    password: str

class

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