Just keep an eye out for anything else.
Why? Do they sometimes do more than they did? Or do you think they may come back again? I doubt they would be able to do anything this time, since I have the updated version and I think the new server is set up more securely.
Just to be sure. Sometimes more damage is done than is immediately visible. Sometimes not.
And by the way, it is cracker, not hacker.
Sorry, I believe I saw you mention this someplace else. While I am familiar with the more historical definition of a hacker, it is not real clear to me how cracker is defined.
Hacker is a programmer, or, someone who is good at what the do. A hack woodsmith is a woodsmith who is good at what they do. They don't do any damage. A hacker may try to find a security hole but they don't do anything beyond that. They will try their best to report it and/or close the hole. They won't try to do any damage.
Cracker is someone who does damage, exploits security holes, etc. Crack=break. Crack a password, break a password. Crack in to a system, break in to a system. Crack a windshield, break a windshield.