⚡ Live Sandbox: AI Dev Tool: FastAPI Pydantic v2 (ea56)

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```python
# AI Dev Tool: FastAPI Hono Cloudflare Workers D1 Starter
# Micro-SaaS Template with PostgreSQL Vector Search Extension

from fastapi import FastAPI, Depends
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import List, Optional
from hono import Hono
from cloudflare import WorkersKV
from psycopg2 import connect
from psycopg2.extras import DictCursor

# Initialize FastAPI App
app = FastAPI()

# Initialize Hono Cloudflare Workers D1
hono = Hono()

# Initialize Cloudflare Workers KV
workers_kv = WorkersKV()

# Initialize PostgreSQL Connection
conn = connect(
    host="localhost",
    database="mydatabase",
    user="myuser",
    password="mypassword"
)
cur = conn.cursor(cursor_factory=DictCursor)

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

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

# Define Routes
@app.get("/users/")
async def read_users():
    """
    Read all users from PostgreSQL database.
    """
    try:
        cur.execute("SELECT * FROM

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