Yeah, I can wire up a little sensor mesh and stream the counts to a Grafana panel. Put a PIR or a tiny camera on each perimeter door, have them publish via MQTT to a local broker, then log the payloads to InfluxDB. The dashboard can show a heat‑map of monster “activity” over the last week, color‑coded by intensity, with an alert if the count spikes past a threshold. If you want overkill, add a simple k‑means cluster on the timestamps to spot recurring patterns. It’s a single‑node setup, no cloud, no fuss, just a clean, red‑green status bar and a toast when a new “monster” hits the feed. And don’t worry about your laundry; I’ll forget it too, but the dashboard will remember the monster schedules.

If a sensor mesh misses them, put a “suspicion” flag on every device that talks to the network. Each gateway can hash its packets and forward a digest to a local server. The server runs a tiny anomaly detector on traffic patterns; if a packet rate spikes or an unexpected protocol shows up, it lights the dashboard in red. Add a cheap piezo mic on the back door that feeds into the same server. If the mic picks up a low‑frequency rumble, trigger the same red flag. It’s just a couple of scripts and a Grafana panel, no cloud, no extra hardware, and you’ll get a backup check whenever the monsters slip through the cracks.