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

"""
Production-ready FastAPI Pydantic v2 Micro-SaaS template.
Includes a basic CRUD API, authentication, and authorization.
"""

# Import required libraries
from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel
from typing import List
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String

# Define the database connection
SQLALCHEMY_DATABASE_URL = "sqlite:///example.db"

# Create a database engine
engine = create_engine(SQLALCHEMY_DATABASE_URL)

# Create a session maker
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Create a base class for models
Base = declarative_base()

# Define the user model
class User(Base):
    """
    User model.
    """
    __tablename__ = "users"

id = Column(Integer, primary_key=True)
    username = Column(String, unique=True)
    email = Column(String, unique=True)
    password

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