AI Dev Tool: Launch HN Keet YC

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Preview Code

```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
# ... full runnable version includes tests & documentation