v0.295.0: a box that was off at its backup time catches up once (R-871, decision 109); the missed-backup banner (decision 110); a late daily timer after a host suspend is skipped

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/metrics/store.go

@@ -329,3 +329,31 @@ func (s *MetricsStore) Prune(olderThan time.Duration) (int64, error) {
 
 	return total, nil
 }
+
+// SampleCount is how many system samples (one a minute) exist in [from, to) — the box's own record of whether it
+// was on (R-871 banner: "the box was off at 02:30").
+func (s *MetricsStore) SampleCount(from, to time.Time) (int, error) {
+	var n int
+	err := s.db.QueryRow(`SELECT COUNT(*) FROM system_metrics WHERE ts >= ? AND ts < ?`, from.Unix(), to.Unix()).Scan(&n)
+	return n, err
+}
+
+// HourSampleCounts returns the number of system samples per UTC hour start (unix seconds) in [from, to) — the
+// banner's "when is this box usually on" pattern (R-871). At most 24×7 rows for a week.
+func (s *MetricsStore) HourSampleCounts(from, to time.Time) (map[int64]int, error) {
+	rows, err := s.db.Query(`SELECT (ts / 3600) * 3600 AS h, COUNT(*) FROM system_metrics WHERE ts >= ? AND ts < ? GROUP BY h`, from.Unix(), to.Unix())
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	out := map[int64]int{}
+	for rows.Next() {
+		var h int64
+		var n int
+		if err := rows.Scan(&h, &n); err != nil {
+			return nil, err
+		}
+		out[h] = n
+	}
+	return out, rows.Err()
+}