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

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, Field
from typing import Optional
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

# Initialize the FastAPI application
app = FastAPI()

# Define the OAuth2 password bearer
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

# Define the user model
class User(BaseModel):
    """User model."""
    id: int = Field(..., description="User ID")
    username: str = Field(..., description="Username")
    email: str = Field(..., description="Email")

# Define the token model
class Token(BaseModel):
    """Token model."""
    access_token: str = Field(..., description="Access token")
    token_type: str = Field(..., description="Token type")

# Define the database engine
SQLALCHEMY
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