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```python
# AI Dev Tool: FastAPI + Supabase Production Starter Boilerplate
# Description: A production-ready boilerplate for building scalable and secure APIs with FastAPI and Supabase.

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel
from supabase import create_client, Client
from typing import Optional

# Initialize FastAPI app
app = FastAPI()

# Initialize Supabase client
SUPABASE_URL = "https://your-supabase-instance.supabase.co"
SUPABASE_KEY = "your-supabase-key"
SUPABASE_SECRET = "your-supabase-secret"
supabase: Client = create_client(SUPABASE_URL, SUPABASE_KEY)

# Define OAuth2 scheme
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

# Define user model
class User(BaseModel):
    id: int
    username: str
    email: str

# Define token model
class Token(BaseModel):
    access_token: str
    token_type: str

# Define authentication dependency
async def get_current_user(token: str = Depends(oauth2_scheme)):
    """
    Authenticate user based on provided token

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