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docs: add BUG-21 — OBD speed dropout mid-drive, GPS-only replay

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Mathieu Moran
2026-08-14 22:22:16 -04:00
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PLAN.md
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@@ -2282,6 +2282,10 @@ logged as `BUG-XX` entries in [BUGS.md](./BUGS.md) (BUG-16 onward) and fixed + v
- **BUG-20 (server trip IDs inflate) — ✅ FIXED**: `trips.id BIGSERIAL` burned sequence values
on every upsert (recompute after each upload batch). Fixed: sequence clamped to `MAX(id)`
after each recompute + one-time renumber migration — trips now 1..10, sequence at 10.
- **BUG-21 (OBD speed dropout mid-drive) — OPEN**: ELM327 stopped returning speed for ~20 min
on 2026-08-13 (22:23:50→22:43:41 UTC); Pi logged NULL speed (no GPS-speed fallback), so the
replay shows 0 km/h for that stretch. Proposed: GPS-speed fallback in `_log_loop()` + OBD
reconnect on stalled reads.
Open items from the drive — fill in as reported:
- (none clock-related — BUG-17/BUG-18 closed 2026-08-14).