As andrivet said, they are repairable, however you have to ask, why did it break?
Was it poor manufacture?
Was it flexing on the cable? (this is my bet)
is there any weakness in the surrounding wire that will fail if you repair it?
The question of weather or not you should repair the wire really is dependent on how long it will take to get a replacement.
If it’s gonna take a while to get the replacement, do the repair and replace it when the spares arrive.
I’ve broken 3 so far, so carry a few spares for that reason.
The most common cause is the wire flexing tight in the same place as the bed moves back and forth.
It might pay the check the wire flex an potentially change the way the cable is attached to reduce the single point bending as much as possible.
This reduce my failure rate quite a bit.