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

"""
Production-ready FastAPI + Pydantic v2 Micro-SaaS boilerplate.
Includes a basic CRUD API, authentication, and error handling.
"""

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, Field
from pydantic.errors import ListError
from typing import List, Optional
from datetime import datetime, timedelta
from jose import jwt, JWTError
from passlib.context import CryptContext
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

# Database Configuration
SQLALCHEMY_DATABASE_URL = "sqlite:///example.db"

engine = create_engine(SQLALCHEMY_DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()

# Pydantic Models
class User(BaseModel):
    """User model."""
    id: int = Field(..., description="User ID")
    username: str = Field(..., description="Username")
    email: str =

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