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```python
# AI Dev Tool: FastAPI Hono Cloudflare Workers D1 Starter
# Micro-SaaS Template with Pydantic v2 and PostgreSQL Vector Search

from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import List, Optional
import psycopg2
import psycopg2.extras
import json
from cloudflare import Cloudflare

# 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

# Define the PostgreSQL database connection
conn = None

# Define the Cloudflare Workers D1 client
cf = Cloudflare()

# Define the API routes
@app.get("/users")
async def get_users():
    """
    Get all users from the database
    """
    try:
        # Establish a connection to the database
        global conn
        if conn is None:
            conn = psycopg2.connect(
                host="localhost",
                database="mydatabase",
                user="myuser",
                password="mypassword"
            )

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