⚡ Live Sandbox: AI Dev Tool: AGENTSmd AINative SaaS (0mav)

📝 Editable Code Sandbox

```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate with PostgreSQL Vector Search Extension
# ==============================================================================
# This is a production-ready developer code asset for building a micro-SaaS application
# using FastAPI, Pydantic v2, and PostgreSQL Vector Search Extension.

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List, Optional
from psycopg2 import connect, Error
from psycopg2.extras import DictCursor
from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from sqlalchemy.exc import SQLAlchemyError

# Initialize the FastAPI application
app = FastAPI()

# Define the Pydantic model for the micro-SaaS application
class User(BaseModel):
    """User model"""
    id: int
    name: str
    email: str

class Item(BaseModel):
    """Item model"""
    id: int
    name: str
    description: str

# Define the PostgreSQL database connection
def get_db_connection():
    """Get a connection to the PostgreSQL database"""
    try:
        conn = connect(
            dbname="micro_saaS",
            user

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