Use yesterday as T-1

update.sh

@@ -80,12 +80,13 @@ except Exception:
     timezone_name = "UTC"
 
 now = datetime.now(tz)
-today = now.date()
-# T-5 through T-1. The end boundary is today because Superset treats it as the
-# exclusive business-day boundary for this chart's shifted time dimension.
+# Use the last completed calendar day as the anchor: T-1 is always yesterday.
+# All query windows below therefore exclude today's incomplete data.
+today = now.date() - timedelta(days=1)
+# T-5 through T-1, where the chart's shifted `dt` values are the five labels
+# from five days before today through yesterday.
 start_date = today - timedelta(days=5)
 time_range = f"{start_date.isoformat()} : {today.isoformat()}"
-# The chart's shifted `dt` values label the five returned business days.
 requested_dates = [
     (today - timedelta(days=offset)).isoformat() for offset in range(4, -1, -1)
 ]