Looks like nightshade, ripe berries turn very dark. Edibility is controversial.

This one is Solanum dulcamara, Woody Nightshade or Bittersweet. The berries remain red, unlike S nigra and its cousins which have black/dark purple berries. Edibility on this particular species is not controversial - all parts are poisonous.

Thanks.

I won't eat the berries.

Do I need to worry it will invade the blackberry patch?

It will get into the blackberries but the blackberries won't be affected. Solanum dulcamara is a non-native invasive species in N America so I think most people would just get rid of it.