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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Template
# Description: A production-ready starter boilerplate for building micro-SaaS applications with FastAPI and Pydantic v2.

from fastapi import FastAPI, Depends, HTTPException
from pydantic import BaseModel, validator
from typing import Optional
from supabase import create_client, Client

# Initialize the FastAPI application
app = FastAPI()

# Initialize the 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)

# Define the user model using Pydantic
class User(BaseModel):
    id: int
    email: str
    password: str

@validator("email")
    def validate_email(cls, v):
        if "@" not in v:
            raise ValueError("Invalid email address")
        return v

# Define the authentication dependency
async def get_user(user_id: int):
    user_data = supabase.from_("users").select("*").eq("id", user_id).execute()

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