So the complete error meassage reads:

line 2870967: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1ax to use near ')' at line 1

I checked out the line and more parantheses are being closed than opened. But as I have said, this was created via web UI dump, which is directly from IONOS, it is not PHP My Admin. I dont know the exact command it uses. But there should not be any errors in it.

The thing you said, Allen, makes totally sense. I guess before that line, there is some data that cannot be parsed and that way an opened paranthesis cannot be read.

Is there a fix for this?

I have contacted IONOS, and they suggested some fixes. I'll try them out on Monday. If anything works I'll post it here for future reference.