better unit detection

weed/storage/needle/volume_ttl.go

@@ -145,6 +145,21 @@ func SecondsToTTL(seconds int32) string {
 	if seconds == 0 {
 		return ""
 	}
+	if seconds%(3600*24*365) == 0 && seconds/(3600*24*365) < 256 {
+		return fmt.Sprintf("%dy", seconds/(3600*24*365))
+	}
+	if seconds%(3600*24*30) == 0 && seconds/(3600*24*30) < 256 {
+		return fmt.Sprintf("%dM", seconds/(3600*24*30))
+	}
+	if seconds%(3600*24*7) == 0 && seconds/(3600*24*7) < 256 {
+		return fmt.Sprintf("%dw", seconds/(3600*24*7))
+	}
+	if seconds%(3600*24) == 0 && seconds/(3600*24) < 256 {
+		return fmt.Sprintf("%dd", seconds/(3600*24))
+	}
+	if seconds%(3600) == 0 && seconds/(3600) < 256 {
+		return fmt.Sprintf("%dh", seconds/(3600))
+	}
 	if seconds/60 < 256 {
 		return fmt.Sprintf("%dm", seconds/60)
 	}