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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate with PostgreSQL Vector Search Extension
# ==================================================================================================
from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, Field
from typing import Optional, List
from psycopg2 import connect, Error
from psycopg2.extras import DictCursor
import uvicorn
import os

# PostgreSQL connection settings
POSTGRES_HOST = os.environ.get("POSTGRES_HOST", "localhost")
POSTGRES_DB = os.environ.get("POSTGRES_DB", "mydb")
POSTGRES_USER = os.environ.get("POSTGRES_USER", "myuser")
POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD", "mypassword")

# OAuth2 scheme definition
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

# Define the FastAPI application
app = FastAPI()

# Define the user model
class User(BaseModel):
    """User model"""
    id: int = Field(..., description="User ID")
    username: str = Field(..., description="Username")
    email: str = Field(..., description="Email")

# Define the item model

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