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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS Boilerplate
# =====================================================
# This is a production-ready developer code asset for building micro-SaaS applications
# using FastAPI and Pydantic v2. It includes a robust CLI automation tool for
# generating boilerplate code and a PostgreSQL Vector Search Extension for efficient
# searching.

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

# Define the FastAPI application
app = FastAPI()

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

# Define the Pydantic model for user authentication
class User(BaseModel):
    username: str
    password: str

# Define the PostgreSQL connection settings
POSTGRES_HOST = os.environ.get("POSTGRES_HOST", "localhost")
POSTGRES_DB = os.environ.get("POSTGRES_DB", "mydb")
POSTGRES_USER = os.environ.get("POSTGRES_USER", "myuser")
POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD", "mypassword")

# Define the PostgreSQL

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