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```python
# AI Dev Tool: Reticulum Decentralized Mesh Network PostgreSQL Vector Search Extension
# Description: A production-ready developer code asset for building decentralized mesh networks
#              with PostgreSQL vector search extension.

import os
import psycopg2
from psycopg2 import extras
from fastapi import FastAPI, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from typing import List, Optional

# Define the PostgreSQL connection settings
POSTGRES_HOST = os.environ.get("POSTGRES_HOST", "localhost")
POSTGRES_PORT = os.environ.get("POSTGRES_PORT", 5432)
POSTGRES_USER = os.environ.get("POSTGRES_USER", "postgres")
POSTGRES_PASSWORD = os.environ.get("POSTGRES_PASSWORD", "postgres")
POSTGRES_DB = os.environ.get("POSTGRES_DB", "reticulum")

# Define the Reticulum mesh network settings
RETICULUM_NETWORK_ID = os.environ.get("RETICULUM_NETWORK_ID", "mainnet")
RETICULUM_NODE_ID = os.environ.get("RETICULUM_NODE_ID", "node1")

# Create a FastAPI app
app = FastAPI()

# Define a Pydantic model for the vector search query
class VectorSearch

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