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```python
# AI Dev Tool: FastAPI + Supabase Production Starter Boilerplate
# Description: A high-demand production-ready developer code asset for building micro-SaaS applications
# Author: Elite Software Architect and Micro-SaaS Developer

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 application
app = FastAPI()

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

# OAuth2 scheme for authentication
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="login")

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

# Define authentication response model
class AuthResponse(BaseModel):
    access_token: str
    token_type: str

# Define login request model
class LoginRequest(BaseModel):
    username: str

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