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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 OAuth2PasswordBearer, OAuth2PasswordRequestForm
from pydantic import BaseModel, validator
from typing import Optional
import psycopg2
from psycopg2 import Error
import uvicorn
from cloudflare import Cloudflare

# Initialize the FastAPI application
app = FastAPI()

# Define the OAuth2 scheme
oauth2_scheme = OAuth2PasswordBearer(tokenUrl="token")

# Define the user model
class User(BaseModel):
    """User model"""
    id: int
    username: str
    email: str
    full_name: Optional[str] = None
    disabled: Optional[bool] = None

@validator("email")
    def email_must_contain_at_symbol(cls, v):
        """Validate email"""
        if "@" not in v:
            raise ValueError("must contain @")
        return v

# Define the item model
class Item(BaseModel):
    """

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