Very strange mongoDb collection socket.io

[Normando]

Today I look in mongoDB, and found this:

a collection named socket.io inside de nodeBB database, with only two documents:

{ 
    "_id" : ObjectId("5e82e403098ad51477bdf63e"), 
    "dummy" : true
}

{ 
    "_id" : ObjectId("5e82e404098ad51477bdf63f"), 
    "event" : "socket.io", 
    "message" : {
        "uid" : "GNyySH", 
        "data" : BinData(0, "koOkdHlwZQKkZGF0YZKyZXZlbnQ6bm9k.. 84 more bytes")
    }
}

What that means? Any hacking attempt?

[Normando]

I have found this without reply

Is it safe to remove socket.io collection from database

My forum is using MongoDB and I notice nodebb keeps bunch of data on socket.io collection. Can I clean them?

NodeBB Community (community.nodebb.org)

[baris]

It is used by nodebb socket.io dependencies.