feat(scarab): ledger-daemon PR-1 scaffold (Khepri-3 watchdog)#105
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🪲 First building block of the Scarabaeus Engine (#101) — a single-replica Railway service that ticks every 30 s and corrects course from above. ## What's in this scaffold (PR-1) - Workspace member: `bin/ledger-daemon` with Cargo.toml + README.md. - main.rs: tokio runtime, neon connect, tick loop with MissedTickBehavior::Skip, graceful Ctrl-C, four-job dispatch with no-fatal error collection. - config.rs: env parsing (NEON_DATABASE_URL with TRIOS_NEON_DSN/DATABASE_URL fallback chain matching trios-trainer-igla::neon_writer), tick_secs, worker_dead_after_secs, leak_bpb_threshold, telegram, destructive_ok. - audit.rs: R7 triplet emit helper writing to gardener_runs (action, lane, seed, before_bpb, after_bpb, decision JSONB). - jobs.rs: four jobs as DRY-RUN scaffolds. Each runs the full SELECT and emits an audit row with `decision.dry_run=true` so we can verify decision quality from gardener_runs before wiring mutations. ## Four jobs | Job | Trigger | Dry-run audit action | Mutation (PR-N) | |---|---|---|---| | 1 | workers.last_heartbeat > N s | `resurrect_candidate` | PR-2 Railway API redeploy | | 2 | queue_depth (pending+ready) | `autoscale_compute` | PR-3 service replicas patch | | 3 | done rows with bpb < threshold | `leak_flag` (writes last_error) | already live | | 4 | running rows older than N h | `zap_stuck` (Khepri-2 requeue) | already live | Jobs 3 and 4 are NOT dry-run — they write last_error and requeue respectively. Jobs 1 and 2 are dry-run-only until PR-2 / PR-3. ## Verified locally ``` $ cargo build -p ledger-daemon # clean $ cargo test -p ledger-daemon # 0 passed (no unit tests yet, PR-2 adds) $ cargo fmt -p ledger-daemon # clean ``` ## Refs - parent: trios-railway#101 🪲 Scarabaeus Engine umbrella - depends-on: trios-railway#102 (Khepri-0 contract test) - depends-on: trios-railway#103 (Khepri-1 LISTEN/NOTIFY) - depends-on: trios-railway#104 (Khepri-2 retry/DLQ) Anchor: phi^2 + phi^-2 = 3 — TRINITY — NEVER STOP.
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🪲 First building block of the Scarabaeus Engine (trios-railway#101).
This is PR-1 of 5 for Khepri-3. Scaffolds the crate with the tick loop, config, R7 audit emitter, and four DRY-RUN job stubs. Mutations land in PR-2..PR-5 (one per job).
Four jobs
workers.last_heartbeat > N sresurrect_candidateautoscale_computebpb < thresholdleak_flag(writes last_error)zap_stuck(Khepri-2 requeue)Jobs 3 and 4 are not dry-run — they write
last_errorand requeue respectively.Verified locally
Refs
Anchor:
phi^2 + phi^-2 = 3. NEVER STOP.