⚡ Live Sandbox: AI Dev Tool: FastAPI Pydantic v2 (ok5b)

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# =========================================================
# This is a production-ready boilerplate for building micro-SaaS applications
# using FastAPI and Pydantic v2. It includes a basic API structure, database
# integration, and authentication using JWT.

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 jose import jwt, JWTError
from datetime import datetime, timedelta

# Database Configuration
# ----------------------
SQLALCHEMY_DATABASE_URL = "postgresql://user:password@host:port/dbname"
engine = create_engine(SQLALCHEMY_DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

# Models
# ------
class User(Base):
    """User model"""
    __tablename__ = "users"
    id = Column(Integer, primary_key=True)
    username = Column(String, unique=True)

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