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```python
# AI Dev Tool: Secure Micro-SaaS Boilerplate
# =============================================
# A production-ready starter template for building secure micro-SaaS applications
# using FastAPI, Pydantic, and Supabase.

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

# Initialize FastAPI app
app = FastAPI()

# Initialize Supabase client
supabase_url = "https://your-supabase-instance.com"
supabase_key = "your-supabase-key"
supabase: Client = create_client(supabase_url, supabase_key)

# Define authentication scheme
security = HTTPBearer()

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

# Define authentication endpoint
@app.post("/login")
async def login(user: User):
    """
    Authenticate user and return access token.

Args:
    - user (User): User credentials

Returns:
    - access_token (str): Access token for authenticated user
    """
    try:
        # Authenticate user using Supabase
        auth

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