File clamav-timer.patch of Package clamav
diff -purN a/freshclam/clamav-freshclam-once.timer.in b/freshclam/clamav-freshclam-once.timer.in
--- a/freshclam/clamav-freshclam-once.timer.in 2023-10-24 19:10:14.000000000 +0200
+++ b/freshclam/clamav-freshclam-once.timer.in 2023-11-27 21:47:29.930643325 +0100
@@ -1,11 +1,9 @@
[Unit]
-Description=Daily ClamAV virus database update
+Description=Hourly ClamAV virus database update
[Timer]
-OnCalendar=daily
-AccuracySec=1h
-RandomizedDelaySec=1h
-Persistent=true
+OnBootSec=5m
+OnUnitActiveSec=1h
[Install]
WantedBy=timers.target