⚡ Live Sandbox: AI Dev Tool: Nextjs Expo Monorepo (f0a3)

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```python
# AI Dev Tool: Edge AI Vector Search API
# =======================================
# A production-ready API integration wrapper for PostgreSQL Vector Search Extension
# using FastAPI, Pydantic v2, and Hono Cloudflare Workers D1 Starter.

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel
from typing import List, Optional
import psycopg2
import json

# Define the Vector Search API model
class VectorSearchQuery(BaseModel):
    """Vector search query model."""
    query: str
    limit: Optional[int] = 10

# Define the Vector Search API response model
class VectorSearchResponse(BaseModel):
    """Vector search response model."""
    results: List[dict]

# Initialize the FastAPI app
app = FastAPI()

# Define the PostgreSQL database connection settings
DB_HOST = "localhost"
DB_PORT = 5432
DB_NAME = "vector_search_db"
DB_USER = "vector_search_user"
DB_PASSWORD = "vector_search_password"

# Establish a connection to the PostgreSQL database
def connect_to_db():
    """Connect to the PostgreSQL database."""
    try:
        conn = psycopg2.connect(
            host=DB_HOST,
            port=DB_PORT,
            database=DB_NAME,
            user=DB

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