⚡ Live Sandbox: AI Dev Tool: Claude Opus 55 Intelligence

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```python
# AI Dev Tool: FastAPI Pydantic v2 Micro-SaaS with PostgreSQL Vector Search Extension
# ==============================================================================
# This is a production-ready developer code asset for building high-performance
# Micro-SaaS applications with FastAPI, Pydantic v2, and PostgreSQL Vector Search Extension.

from fastapi import FastAPI, Depends, HTTPException
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from pydantic import BaseModel
from typing import List, Optional
import psycopg2
from psycopg2 import Error
import logging

# Initialize the FastAPI application
app = FastAPI()

# Define the Pydantic model for the user
class User(BaseModel):
    id: int
    username: str
    email: str

# Define the Pydantic model for the search query
class SearchQuery(BaseModel):
    query: str

# Define the PostgreSQL connection settings
POSTGRES_HOST = "localhost"
POSTGRES_DB = "mydatabase"
POSTGRES_USER = "myuser"
POSTGRES_PASSWORD = "mypassword"

# Initialize the PostgreSQL connection
def get_postgres_connection():
    try:
        return psycopg2.connect(
            host=POSTGRES_HOST,
            database=POSTGRES_DB,
            user=POST

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