New seen_macs table: permanent, insert-only, MAC-keyed record of the
first time each device was ever seen -- deliberately decoupled from
devices.first_seen (IP-keyed, would false-positive on every DHCP
lease change). Bootstrap-safe: first call seeds the baseline from
whatever's currently on the network without alerting on all 71+
existing devices at once. Verified locally: bootstrap call reports
nothing new, repeat calls with the same MACs report nothing new, one
genuinely new MAC gets reported exactly once.
Pushes a Home Assistant persistent_notification when a new MAC
appears (gated behind HOME_ASSISTANT_TOKEN + homeAssistant.url in
hosts.yaml -- missing config just means no push, detection still
runs). Also surfaced directly in the dashboard as a blue "new" badge
for anything first seen in the last 24h, independent of HA config.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
jhodgkin
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