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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# =======================================================
# A production-ready starter boilerplate for building micro-SaaS applications
# using FastAPI, Pydantic v2, and Supabase.

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, Field
from supabase import create_client, Client
from typing import Optional

# Initialize Supabase client
SUPABASE_URL = "https://your-supabase-url.supabase.co"
SUPABASE_KEY = "your-supabase-key"
SUPABASE_SECRET = "your-supabase-secret"
supabase: Client = create_client(SUPABASE_URL, SUPABASE_KEY)

# Initialize FastAPI app
app = FastAPI()

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

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

# Token model
class Token(BaseModel):

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