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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate with PostgreSQL Vector Search Extension
# =================================================================================================

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List, Optional
import psycopg2
import psycopg2.extras
from psycopg2 import Error

# Initialize FastAPI App
app = FastAPI(
    title="FastAPI Pydantic v2 Micro-SaaS Boilerplate",
    description="A production-ready starter boilerplate for building micro-SaaS applications",
    version="1.0.0",
)

# Define PostgreSQL Database Connection Settings
POSTGRES_HOST = "localhost"
POSTGRES_DB = "mydatabase"
POSTGRES_USER = "myuser"
POSTGRES_PASSWORD = "mypassword"

# Define PostgreSQL Vector Search Extension Settings
VECTOR_SEARCH_TABLE = "myvectorsearchtable"
VECTOR_SEARCH_COLUMN = "myvectorsearchcolumn"

# Define Pydantic Models
class Item(BaseModel):
    id: int
    name: str
    description: Optional[str] = None

class VectorSearchQuery(BaseModel):
    query: str
    limit: int = 10

# Initialize PostgreSQL Database Connection
def get_db_connection():
    try:
        return

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