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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# ======================================================

"""
Production-ready FastAPI Pydantic v2 Micro-SaaS boilerplate.
Includes user authentication, authorization, and example API endpoints.
"""

# Import dependencies
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
from sqlalchemy.exc import IntegrityError
from jose import jwt, JWTError
from datetime import datetime, timedelta

# Define constants
SECRET_KEY = "your_secret_key_here"
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 30

# Define database connection
SQLALCHEMY_DATABASE_URL = "sqlite:///example.db"
engine = create_engine(SQLALCHEMY_DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Define database models
Base = declarative_base()

class User(Base):
    __tablename__ = "users"
    id = Column(Integer, primary_key

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