⚡ Live Sandbox: AI Dev Tool: Rust WebAssembly Edge Function

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```python
# AI Dev Tool: TurboSaaS - FastAPI Pydantic v2 Micro-SaaS Boilerplate
# =====================================================================
# This is a high-demand, production-ready developer code asset for building
# micro-SaaS applications using FastAPI, Pydantic v2, and PostgreSQL.

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, Session
import uvicorn
import os

# Define the database connection URL
DATABASE_URL = os.environ.get("DATABASE_URL")

# Create a database engine
engine = create_engine(DATABASE_URL)

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

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

# Define the OAuth2 scheme
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

# Define the user model
class User(Base):

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