Show how each domain has behaved over a day, a week, a month and a year, not just now

Plugin/unraid/include/auth.php

@@ -332,6 +332,31 @@ function vv_auth_uptime_window(array $buckets, int $n): ?float {
     return $t > 0 ? round($u / $t * 100, 2) : null;
 }
 
+// The same buckets as a drawable series: one entry per period on the calendar, oldest first, null
+// where nothing was recorded. Aligned to the clock rather than packed, because the gap is the
+// information — a domain probed for two of the last thirty days must read as twenty-eight unknowns
+// and not as a solid bar chart that happens to be short.
+//
+// Keys are built with mktime rather than strtotime("-N month"), which resolves relative to today's
+// day-of-month and skips a month entirely when run on the 31st.
+function vv_auth_uptime_series(array $buckets, int $n, string $unit, ?int $now = null): array {
+    $now = $now ?? time();
+    [$Y, $M, $D, $H] = [(int) date('Y', $now), (int) date('n', $now),
+                        (int) date('j', $now), (int) date('G', $now)];
+    $out = [];
+    for ($i = $n - 1; $i >= 0; $i--) {
+        // mktime normalises underflow, so hour -3 is 21:00 the previous day and month 0 is December.
+        [$fmt, $ts] = match ($unit) {
+            'hour'  => ['YmdH', mktime($H - $i, 0, 0, $M, $D, $Y)],
+            'month' => ['Ym',   mktime(0, 0, 0, $M - $i, 1, $Y)],
+            default => ['Ymd',  mktime(0, 0, 0, $M, $D - $i, $Y)],
+        };
+        $b = $buckets[date($fmt, $ts)] ?? null;
+        $out[] = ($b && ($b['t'] ?? 0) > 0) ? round($b['u'] / $b['t'] * 100, 2) : null;
+    }
+    return $out;
+}
+
 function vv_auth_db_file(string $name): string {
     return rtrim(defined('DB_DIR') ? DB_DIR : (DATA_DIR . '/db'), '/') . '/' . $name;
 }