⚡ Live Sandbox: AI Dev Tool: Hono Cloudflare Workers (5pf9)

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Starter Boilerplate
# =====================================================================

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
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
from cloudflare import CloudflareAPI

# Initialize FastAPI application
app = FastAPI()

# Define 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 database models
Base = declarative_base()

class User(Base):
    """User database model"""
    __tablename__ = "users"
    id = Column(Integer, primary_key=True)
    name = Column(String)
    email = Column(String, unique=True)

class Item(Base):
    """Item database model"""
    __tablename__ = "items"
    id = Column(Integer, primary_key=True)
    title = Column(String)
    description = Column(String)
    owner_id = Column(Integer, ForeignKey("users.id"))

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