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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Starter
# Description: Production-ready FastAPI starter with Pydantic v2, Supabase, and Cloudflare Worker Hono API template
# Author: Elite Software Architect

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel
from typing import Optional
from supabase import create_client, Client
import os
import json

# Initialize FastAPI app
app = FastAPI()

# Initialize Supabase client
SUPABASE_URL = os.environ.get("SUPABASE_URL")
SUPABASE_KEY = os.environ.get("SUPABASE_KEY")
supabase: Client = create_client(SUPABASE_URL, SUPABASE_KEY)

# Initialize Cloudflare Worker Hono API template
HONO_API_KEY = os.environ.get("HONO_API_KEY")
HONO_API_SECRET = os.environ.get("HONO_API_SECRET")

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

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

# Define authentication

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