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Kpa-clawbot
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## Summary Implements repeater liveness detection per #662 — distinguishes a repeater that is **actively relaying traffic** from one that is **alive but idle** (only sending its own adverts). ## Approach The backend already maintains a `byPathHop` index keyed by lowercase hop/pubkey for every transmission. Decode-window writes also key it by **resolved pubkey** for relay hops. We just weren't surfacing it. `GetRepeaterRelayInfo(pubkey, windowHours)`: - Reads `byPathHop[pubkey]`. - Skips packets whose `payload_type == 4` (advert) — a self-advert proves liveness, not relaying. - Returns the most recent `FirstSeen` as `lastRelayed`, plus `relayActive` (within window) and the `windowHours` actually used. ## Three states (per issue) | State | Indicator | Condition | |---|---|---| | 🟢 Relaying | green | `last_relayed` within `relayActiveHours` | | 🟡 Alive (idle) | yellow | repeater is in the DB but `relay_active=false` (no recent path-hop appearance, or none ever) | | ⚪ Stale | existing | falls out of the existing `getNodeStatus` logic | ## API - `GET /api/nodes` — repeater/room rows now include `last_relayed` (omitted if never observed) and `relay_active`. - `GET /api/nodes/{pubkey}` — same fields plus `relay_window_hours`. ## Config New optional field under `healthThresholds`: ```json "healthThresholds": { ..., "relayActiveHours": 24 } ``` Default 24h. Documented in `config.example.json`. ## Frontend Node detail page gains a **Last Relayed** row for repeaters/rooms with the 🟢/🟡 state badge. Tooltip explains the distinction from "Last Heard". ## TDD - **Red commit** `4445f91`: `repeater_liveness_test.go` + stub `GetRepeaterRelayInfo` returning zero. Active and Stale tests fail on assertion (LastRelayed empty / mismatched). Idle and IgnoresAdverts already match the desired behavior under the stub. Compiles, runs, fails on assertions — not on imports. - **Green commit** `5fcfb57`: Implementation. All four tests pass. Full `cmd/server` suite green (~22s). ## Performance `O(N)` over `byPathHop[pubkey]` per call. The index is bounded by store eviction; a single repeater has at most a few hundred entries on real data. The `/api/nodes` loop adds one map read + scan per repeater row — negligible against the existing enrichment work. ## Limitations (per issue body) 1. Observer coverage gaps — if no observer hears a repeater's relay, it'll show as idle even when actively relaying. This is inherent to passive observation. 2. Low-traffic networks — a repeater in a quiet area legitimately shows idle. The 🟡 indicator copy makes that explicit ("alive (idle)"). 3. Hash collisions are mitigated by the existing `resolveWithContext` path before pubkeys land in `byPathHop`. Fixes #662 --------- Co-authored-by: clawbot <bot@corescope.local>