This episode was super sad. Alex needing to have her memories of Kara being Supergirl erased. It's not a trigger or a squick it just made me incredibly sad.
Even though I'm positive that Alex will remember or relearn the truth at some point.
On the plus side Nia and Brainy were really cute in this episode. And Brainy put it in Nia's head to be a superhero. I want that.