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Oliver Kieselbach
0a0c323f73
Three CmTraceTimeSkewRegression fires on 2026-09-01 (one tenant, sessions e797117b / c06d639d / d7c8032b, agent 2.0.1445, each exactly -60.0 min, residual 0.0, 85-88 % grid-conformant) all came from the same stale leg: those sessions are pre-provisioning, their Part 1 ran on 2026-08-20 under agent 2.0.1409 (before per-line anchoring) and left 23-26 IME samples at -60.00, while the Part 2 leg that completed that morning is clean at -0.16. The terminal reconcile scans the whole event partition, so the old leg supplied the majority of the IME samples and fired against a build the device had self-updated to minutes earlier. Real skew, 12 days old, already fixed - and >=821 pending pre-provisioning sessions with agent < 1412 are queued to repeat it. Event rows carry no agent version, so the split is drawn on ReceivedAt: ResolveEraStartUtc walks the batch stamps of BOTH sides back from the newest one and ends the era at the first gap > EraGapHours (2.0) - above any in-leg upload gap (self-metrics every few minutes, session_stalled at 60 min idle, maintenance sweep at 2 h), below every pre-provisioning handover. Median, grid residual, conformity AND the distinct-batch guard now all run on the same era-filtered sample set; the batch counters used to come from the full scan. SessionSkewScan carries ReceivedAt per sample and its 20k cap keeps the NEWEST samples (chunked trim) - keeping the head would have blinded the detector on exactly the sessions large enough to reach it. The ops event reports eraStartUtc plus the excluded per-side counts, so an inherited leg stays visible without being alarmed on. Tests: 3 new era facts, mutation-proven (EraGapHours = 100000 turns exactly those three red). The handover fact also asserts that the old leg judged on its own still fires, so it is the window that silences it, not a moved threshold. Backend 5334 green, Agent core 2805 green, solution builds with 0 warnings. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>