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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# =======================================================
# This is a production-ready FastAPI boilerplate for building micro-SaaS applications.
# It includes Pydantic v2 for data validation and serialization, and supports PostgreSQL Vector Search Extension.

from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel, Field
from typing import List, Optional
import psycopg2
from psycopg2 import Error
import uvicorn

# Initialize FastAPI app
app = FastAPI()

# Define Pydantic models for data validation and serialization
class User(BaseModel):
    """User model"""
    id: int = Field(..., description="User ID")
    name: str = Field(..., description="User name")
    email: str = Field(..., description="User email")

class Item(BaseModel):
    """Item model"""
    id: int = Field(..., description="Item ID")
    name: str = Field(..., description="Item name")
    description: Optional[str] = Field(None, description="Item description")

# Define database connection settings
DB_HOST = "localhost"
DB_NAME = "mydatabase"
DB_USER = "

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