diff --git a/deploy/deploy.sh b/deploy/deploy.sh
index 8dcac64..7ce7db2 100755
--- a/deploy/deploy.sh
+++ b/deploy/deploy.sh
@@ -25,7 +25,11 @@ ssh "root@$HOST" '
   install -m 755 /opt/wizwar/deploy/wizwar-backup.sh /usr/local/bin/wizwar-backup.sh
   install -m 755 /opt/wizwar/deploy/wizwar-rollup.sh /usr/local/bin/wizwar-rollup.sh
   install -m 755 /opt/wizwar/deploy/wizwar-visitors.sh /usr/local/bin/wizwar-visitors.sh
-  install -m 644 /opt/wizwar/deploy/wizwar-rollup.cron /etc/cron.d/wizwar-rollup
+  # On a host the hall shares, its hall-nightly.sh runs the rollup and backup
+  # of every game and checks in with Sentry once for all; a game on a box of
+  # its own schedules its own.
+  if [ -f /etc/cron.d/gamehall ]; then rm -f /etc/cron.d/wizwar-rollup
+  else install -m 644 /opt/wizwar/deploy/wizwar-rollup.cron /etc/cron.d/wizwar-rollup; fi
   systemctl daemon-reload
   systemctl enable --now wizwar
   systemctl restart wizwar
diff --git a/deploy/wizwar-backup.sh b/deploy/wizwar-backup.sh
index d9abc41..f524814 100755
--- a/deploy/wizwar-backup.sh
+++ b/deploy/wizwar-backup.sh
@@ -10,6 +10,8 @@ LOG="/var/log/wizwar/backup.log"
 STAMP=$(date +%Y-%m-%d)
 # Sentry Crons check-in: /root/.wizwar-sentry-cron holds the check-in URL
 # (auto-creates the monitor on first ping). Absent file = no check-ins.
+# On a host the hall shares, hall-nightly.sh runs this and checks in once
+# for every game, so the file is absent and the exit status is the word.
 CRON_URL=$(cat /root/.wizwar-sentry-cron 2>/dev/null || true)
 # One check-in, when the run ends, carrying its duration: a start and a
 # finish sent seconds apart can reach Sentry in either order, and a start
@@ -20,9 +22,10 @@ checkin() { [ -n "$CRON_URL" ] && curl -sf -o /dev/null "$CRON_URL?status=$1&dur
 
 if grep -q CHANGE_ME /root/.config/rclone/rclone.conf; then
   echo "$(date -Is) skipped: Spaces credentials not configured yet" >> "$LOG"
-  exit 0
+  exit 1
 fi
 
+status=0
 {
   echo "=== $(date -Is) backup start"
   if rclone sync "$SRC" "spaces:$BUCKET/wizwar/current" 2>&1 &&
@@ -30,6 +33,7 @@ fi
     checkin ok
   else
     checkin error
+    status=1
   fi
   # Prune dated snapshots older than 90 days (by directory name).
   CUTOFF=$(date -d "90 days ago" +%Y-%m-%d)
@@ -43,3 +47,4 @@ fi
   done
   echo "=== $(date -Is) backup done"
 } >> "$LOG"
+exit $status
diff --git a/deploy/wizwar-rollup.sh b/deploy/wizwar-rollup.sh
index 737a53c..bb6c3f0 100755
--- a/deploy/wizwar-rollup.sh
+++ b/deploy/wizwar-rollup.sh
@@ -9,7 +9,9 @@
 # one count per address per day.
 #   Cron: see SCHEDULE below and /etc/cron.d/wizwar-rollup (deploy.sh installs both).
 #   Sentry Crons check-in: /root/.wizwar-sentry-cron-rollup holds the URL
-#   (absent = no check-ins).
+#   (absent = no check-ins). On a host the hall shares, hall-nightly.sh
+#   runs this and checks in once for every game, so the file is absent and
+#   the exit status is the word.
 set -u
 OUT="/var/lib/wizwar/rollup.jsonl"
 LOG="/var/log/wizwar/rollup.log"
@@ -148,4 +150,4 @@ tmp = out + ".tmp"
 open(tmp, "w").write("\n".join(rows) + "\n"); os.replace(tmp, out)
 print("%s rollup %s: %d requests, %d human addresses, %d new rooms, %d human seats" % (datetime.datetime.now(datetime.timezone.utc).isoformat(), day, req, len(hips), new_rooms, sum(seats.values())))
 PY
-then checkin ok; else checkin error; fi
+then checkin ok; else checkin error; exit 1; fi