The reconciliation worker resets position checkpoints via bulk UPDATE while
the analytics worker saves recalculated positions for the same trader —
MySQL then rejects the stale save ("Record has changed since last read").
The engine run is now retried once with a fresh context (re-reading the
concurrent change); if it still collides, it logs a warning and lets the
next cycle pick the trader up again (LastAnalyzedAt stays unset).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>