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

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate with PostgreSQL Vector Search Extension
# =================================================================================================

from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import List, Optional
import psycopg2
import psycopg2.extras
from psycopg2 import Error

# Initialize FastAPI App
app = FastAPI(title="FastAPI Pydantic v2 Micro-SaaS Boilerplate",
              description="A production-ready starter boilerplate with PostgreSQL Vector Search Extension",
              version="1.0.0")

# Define Pydantic Models
class User(BaseModel):
    """User Model"""
    id: int
    name: str
    email: str

class Item(BaseModel):
    """Item Model"""
    id: int
    title: str
    description: str

# PostgreSQL Database Connection Settings
DB_HOST = "localhost"
DB_NAME = "mydatabase"
DB_USER = "myuser"
DB_PASSWORD = "mypassword"

# Create a PostgreSQL Database Connection
def create_db_connection():
    """Create a PostgreSQL database connection"""
    try:
        connection = psycopg2.connect(
            host=DB_HOST,
            database=DB_NAME

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