⚡ Live Sandbox: AI Dev Tool: AGENTSmd AINative SaaS Template

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```python
# AI Dev Tool: Lumina Edge - Production-Ready FastAPI Pydantic v2 Micro-SaaS Starter
# ==============================================================================
# This is a high-demand, production-ready developer code asset, 
# combining the power of FastAPI, Pydantic v2, and Micro-SaaS architecture.

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel, Field
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

# Initialize the FastAPI application
app = FastAPI(
    title="Lumina Edge",
    description="A production-ready FastAPI Pydantic v2 Micro-SaaS starter",
    version="1.0.0"
)

# Define the database connection
SQLALCHEMY_DATABASE_URL = "postgresql://user:password@host:port/dbname"
engine = create_engine(SQLALCHEMY_DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Define the base class for database models
Base = declarative_base()

# Define a sample database model
class Item(Base):
    __tablename__ = "items"
    id

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