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`get_disks_observation_counts` maps each serial's count to that serial's "most recent" device_name (so renames like ata8 -> sdh keep the badge attached). When several physical disks have passed through the same kernel name across reboots — common with NVMe, the kernel probes in a different order depending on which slots are populated — disk_registry keeps a row per (device_name, serial) seen and the "most recent" device_name for a serial can now be in use by an entirely different disk. Concrete case from the wild: serial 211716800490 was nvme0n1 during the previous boot and earned a real I/O observation. After removing four of five NVMes, the surviving disk (serial 243332800236) booted into nvme0n1. The badge layer mirrored 211716800490's count onto nvme0n1 — which is now a different physical disk — and showed "1 obs." on the wrong drive, while the modal (which scopes by the current (device_name, serial) registry row) found nothing and rendered an empty history. Only mirror a serial's count onto its device_name when that device_name is currently owned by the same serial, determined from the freshest disk_registry row. The serial-keyed entry stays unconditional so observations remain reachable when the disk is re-plugged under another device name. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>