⚡ Live Sandbox: AI Dev Tool: Nextjs Expo Monorepo (6sn0)

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

"""
Production-ready FastAPI Pydantic v2 Micro-SaaS boilerplate.
Includes support for PostgreSQL Vector Search Extension and Hono Cloudflare Workers.
"""

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
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 sqlalchemy.exc import IntegrityError
import psycopg2
import os
import json

# Initialize FastAPI app
app = FastAPI()

# Initialize PostgreSQL connection
SQLALCHEMY_DATABASE_URL = os.environ.get("DATABASE_URL")
engine = create_engine(SQLALCHEMY_DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

# Define Pydantic models
class User(BaseModel):
    """User model."""
    id: int
    username: str
    email: str

class Item(BaseModel):
    """Item model."""
    id: int
    title: str

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