⚡ Live Sandbox: AI Dev Tool: South African diamond mines

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Template for Lab-Grown Diamond Inventory Management
# ==================================================================================================
# This production-ready code asset provides a starter boilerplate for managing lab-grown diamond inventory
# 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 List, Optional

# Initialize FastAPI app
app = FastAPI()

# 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)

# Define OAuth2 scheme
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="login")

# Define lab-grown diamond model
class LabGrownDiamond(BaseModel):
    id: int = Field(..., description="Unique identifier")
    name: str = Field(..., description="Diamond name")
    carat:

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