Each metered settlement now books its billed buckets into its day under
the (provider, model, period) in force — the same SessionCostUsage raw
material the timeline's session-cost totals carry, attributed to the day
the open step INITIATED (step/start armed, step/end cleared, settlement
instant as fallback) so fees land on the turn's own calendar day. The
fold tracks the route in force (last request/header wins) and splits
DeepSeek peak/off-peak off the same instant, so its per-day records
price identically to the session-cost totals. stateVersion bumps 1 → 2:
the dashboard's warm-up cold-refolds every stale row from the durable
log on upgrade. The client's activityOf re-proves the additive-optional
record with the same sanitizer the session-cost rides — a malformed
record drops the fee whole and keeps the day's tokens.
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