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```python
# AI Dev Tool: AGENTS.md AI-Native SaaS Template with PostgreSQL Vector Search Extension
# ================================================================================
# This is a production-ready developer code asset for building AI-native SaaS applications
# with PostgreSQL vector search extension. It includes a CLI automation tool for setting
# up the project and an API integration wrapper for handling PostgreSQL vector search queries.

import os
import sys
import argparse
from typing import Dict, List
from fastapi import FastAPI, Depends
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel
from psycopg2 import connect
from psycopg2.extras import DictCursor

# PostgreSQL connection settings
POSTGRESQL_HOST = os.environ.get("POSTGRESQL_HOST", "localhost")
POSTGRESQL_PORT = int(os.environ.get("POSTGRESQL_PORT", 5432))
POSTGRESQL_USER = os.environ.get("POSTGRESQL_USER", "postgres")
POSTGRESQL_PASSWORD = os.environ.get("POSTGRESQL_PASSWORD", "postgres")
POSTGRESQL_DB = os.environ.get("POSTGRESQL_DB", "postgres")

# Create a FastAPI app
app = FastAPI()

# Define a security scheme for authentication
security = HTTPBearer()

# Define a model for

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