I must have offended Satan or something, but I'm pulling my hairs out over this client data that feels like a fractal of bad validation invented to torment me. Misspelled field names, improperly combined fields, entries in the wrong column, impossible addresses, non-matching staging and production data / keys, invisible freaking characters that ruin automated matching - every dam thing you fix and the next one hits you in the face like a clown stepping on a rake. Jesus.