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Jinwoo-H
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Open decision 3. A column filter over `messages_fts` returns the identical rowid set as `conversation_fts` — checked here per query rather than assumed — so the table exists for latency alone. On a 105 MB corpus at both ends of the tool-output band, the column-filtered form costs 1.16-1.42x at p95, against a bar of 2x, so the recommendation is to delete it. The shoot-out writes its own corpus because the answer turns on the one property the shared generator fixes: how much of a transcript is tool output. Half the tokens in that output are words the conversation also uses, which is deliberately generous to the table under question. The doc records the number that argues the other way. PR 2 priced the table at about a quarter of the index on a corpus whose tool output is 56% of its message text; on a tool-heavy one it is 6.7-11%, because `messages_fts` grows with the tool text and the second table does not. Page warmup is not re-added. The measurement behind it was on a 4 GB index, removing it moves this corpus by less than the run-to-run spread, and a cancellable background pass needs a lifecycle a query library does not have.