Ant Invasion

I have a raised bed off on its own. The bed is quite shallow, but it is a hugel beet, separated from the soil with 1/2" hardware cloth (to keep gophers out. The year before last it became totally overrun with Bermuda grass. Last spring my son and I removed the bed, repaired the bed, the Bermuda grass took prisoners. removed as much of the weeds I could.  The last corner was very hard to clear because there was so many ants. They were only the little black ants, but there were so many I would become covered in ants and they do bite. I dumped a bunch of diatomaceous earth, and left it for quite a while. I did finish the weeding, and was able to put the bed back. I didn't end up using it until this fall. Again I had to put a bunch of DE before I could prepare and plant the bed. There's been a lot of ants, but not so many I couldn't work in the bed. Until today. the fava beans are covered in ants. I didn't see any aphids, but there were so many ants, and they were getting on me and biting, so I couldn't investigate very well.
So what do I do?  With the exception of this bed, I have never had to bother with ants. But I can't even water this bed without having ants all over me. Should I put a bunch of DE on the soil and plants, should I make up some borax and sugar and put it by that bed? Do both?  What would you do?