This is CNBC's Morning Squawk newsletter. Subscribe here to receive future editions in your inbox. Happy Friday. As if this week wasn't newsy enough, we're minutes away from February's jobs report. Stock futures are down this morning after a losing day. Here are five key things investors need to know to start the trading day: Investors have been on a roller coaster ride this week, as the U.S.-Iran war rattles markets. Now, the question is if yesterday's sell-off will resume today, or if there