Two defects from @kelchm's two-machine validation of #946.
1. The daily-cache migration carried the copilot slice of every existing day
entry verbatim instead of re-deriving it, so `overview` on a migrated cache
kept serving pre-store numbers (2,980,804 tokens for a day whose fresh
derivation is 74,811,412; 21,608 calls vs 16,326) while export/models/audit
served the corrected ones off the same cache.
Root cause is the partial-survival guard (e9d922ca), not the migration: it
keeps a settled baseline slice whenever the fresh derivation reports FEWER
calls, reading that as aged-out sources. This change's whole point is that
copilot's supplementary accounting calls stop counting as api calls, so
every store-era day shrinks in calls and got pinned to its pre-store value.
The guard's own TRADE-OFF note predicted exactly this case.
A migration from an older cache version now grants copilot ONE
guarded-shrink-exempt re-derivation (`pendingRederive`), spent by the first
COMPLETE parse. It fires only where that parse actually produced a slice for
the (day, provider), so a day whose sources are gone still carries forward
whole - never-lose is unchanged in both directions - and no other provider
is exempt.
The daily cache moves 21 -> 25: 21-24 landed on main during validation, and
only a number the validators' own daily-cache.v21.json cannot claim gets
their stale carried slices re-derived.
2. The `initiator='compaction'` store row was ingested with outputTokens 0. Its
output has no assistant.message anywhere in events.jsonl, so that row is the
only place those tokens exist - dropping them was the sole token discrepancy
(-3,085) across a 30-session store-matched comparison. It is now read (on the
same optional-select rung as `initiator`, which is what identifies the row),
counted and priced; every other row keeps output 0 because a per-turn call
owns it. The copilot parse version moves to session-store-v3 so cached v2
rows re-parse; the dedup key is deliberately unchanged.
Settle window stays at 24 h - the three-machine evidence for tightening it is
recorded next to the constant, but shortening it is a product call.
12c8cb7790