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```python
# AI Dev Tool: Turbocharged FastAPI Micro-SaaS Boilerplate
# Description: A production-ready, high-performance FastAPI boilerplate for micro-SaaS applications
# Author: [Your Name]

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
from sqlalchemy.orm import sessionmaker
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String
from sqlalchemy.exc import IntegrityError
from cloudflare import WorkersKV
from hono import HonoAPI

# Initialize the FastAPI application
app = FastAPI()

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

# Define the user model
class User(BaseModel):
    """User model"""
    id: int = Field(..., description="User ID")
    username: str = Field(..., description="Username")
    email: str = Field(..., description="Email")
    password: str = Field(..., description="Password")

# Define the database engine
engine = create_engine("postgresql://user:password@host

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