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

"""
Production-ready FastAPI Pydantic v2 Micro-SaaS Boilerplate
===========================================================

This boilerplate provides a basic structure for building a Micro-SaaS application
using FastAPI and Pydantic v2. It includes features such as user authentication,
authorization, and data validation.

Usage:
    $ uvicorn main:app --host 0.0.0.0 --port 8000

Endpoints:
    - /users: Create, read, update, and delete users
    - /products: Create, read, update, and delete products
    - /orders: Create, read, update, and delete orders
"""

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 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"

# Create

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