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

from fastapi import FastAPI, Depends
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel
from typing import List, Optional
import psycopg2
from psycopg2 import extras
import json

# Initialize FastAPI app
app = FastAPI()

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

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

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

# Establish PostgreSQL connection
conn = psycopg2.connect(
    host=POSTGRES_HOST,
    database=POSTGRES_DB,
    user=POSTGRES_USER,
    password=POSTGRES_PASSWORD
)

# Define a dependency for authentication
security = HTTPBearer()

# Define an endpoint

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