Being vague about this would waste your afternoon, so here it is drawn.
2017 → eight days ago
seven days to 24 hours ago
today & ahead
Ask for a date inside the green band and you get exactly what a paying
customer gets. Ask for one outside it and you get 403 outside_window naming the
window and the date you asked for, never an empty array that looks like missing data.
Search endpoints clamp instead of refusing: ask for 2017 to today and a
free key searches the seven days it can read, and says so in meta.searched.