⚡ Live Sandbox: AI Dev Tool: AGENTSmd AINative SaaS (e35j)

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate with PostgreSQL Vector Search Extension
# =================================================================================================
from fastapi import FastAPI, Depends
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import List, Optional
from psycopg2 import connect
from psycopg2.extras import DictCursor
from psycopg2.errors import UniqueViolation
import logging

# Initialize the logger
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Define the PostgreSQL connection settings
POSTGRES_HOST = "localhost"
POSTGRES_PORT = 5432
POSTGRES_DB = "mydatabase"
POSTGRES_USER = "myuser"
POSTGRES_PASSWORD = "mypassword"

# Define the FastAPI app
app = FastAPI()

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

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

# Define the PostgreSQL connection function
def get_db():
    """Get a PostgreSQL database connection"""
    try:
        conn = connect(
            host=POSTGRES_HOST,

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