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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Starter
# ===============================================
# A production-ready starter boilerplate for building micro-SaaS applications
# using FastAPI, Pydantic v2, and PostgreSQL Vector Search Extension.

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel, Field
from pydantic.validators import UUID4
from typing import Optional
import psycopg2
from psycopg2 import Error
import os

# Initialize FastAPI app
app = FastAPI()

# Define Pydantic models
class User(BaseModel):
    id: UUID4 = Field(..., alias="user_id")
    name: str
    email: str

class Item(BaseModel):
    id: UUID4 = Field(..., alias="item_id")
    name: str
    description: str

# Define PostgreSQL database connection
class Database:
    def __init__(self):
        self.host = os.environ.get("DB_HOST")
        self.database = os.environ.get("DB_NAME")
        self.user = os.environ.get("DB_USER")
        self.password = os.environ.get("DB_PASSWORD")

def connect(self):

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