fix(drive-health): preserve collector boot trigger (#124)

drive-health/packaging/set-collector-interval.sh

@@ -18,7 +18,9 @@ dropin_path="$dropin_dir/interval.conf"
 temporary=$(mktemp)
 trap 'rm -f -- "$temporary"' EXIT
 
-printf '[Timer]\nOnUnitActiveSec=\nOnUnitActiveSec=%smin\n' "$interval_minutes" >"$temporary"
+# Resetting a monotonic timer also removes OnBootSec inherited from the base
+# unit, so the drop-in must restore both triggers.
+printf '[Timer]\nOnUnitActiveSec=\nOnBootSec=20s\nOnUnitActiveSec=%smin\n' "$interval_minutes" >"$temporary"
 install -d -m0755 "$dropin_dir"
 install -m0644 "$temporary" "$dropin_path"
 

drive-health/packaging/uninstall-system-collector.sh

@@ -15,6 +15,7 @@ rm -f \
   "/etc/systemd/system/$service_name.service" \
   "/etc/systemd/system/$service_name.timer"
 rm -rf \
+  "/etc/systemd/system/$service_name.timer.d" \
   "/usr/local/libexec/$service_name" \
   "/run/$service_name"