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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# Description: A production-ready FastAPI boilerplate with Pydantic v2 for building micro-SaaS applications
# Author: [Your Name]

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel, validator
from typing import Optional
import uvicorn
import logging

# Initialize the FastAPI app
app = FastAPI()

# Define the logger
logger = logging.getLogger(__name__)

# Define the security scheme
security = HTTPBearer()

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

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

# Define the authentication dependency
def get_current_user(credentials: HTTPAuthorizationCredentials = Depends(security)):
    """Get the current user"""
    token = credentials.credentials
    # Replace with your authentication logic
    if token != 'secret_token':
        raise HTTPException(status_code=

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