perf(ch): serve latest-state and summary queries from precomputed tables#298
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Pinned to the feat/signal-latest-table branch head (pre-v1.0.13 pseudo-version); re-pin to the v1.0.13 tag once released.
signalsLatest/signalsSnapshot/lastSeen/availableSignals now read the precomputed signal_latest table (model-garage 00010) instead of fanning out across every part of the raw signal table. Location fields read kind=1 rows, which pre-filter (0,0) fixes, so plain argMax replaces argMaxIf. Supersedes the projection-matching shapes from #284/#297. dataSummary per-name count/first-seen/last-seen now read the AggregatingMergeTree summary tables (model-garage 00011) instead of aggregating the raw tables. Counts are over raw inserts, matching the approximation of the previous non-FINAL count(*) reads.
…istency Scanning is positional so agg_location worked, but the non-location branch of the latest UNION ALL aliases its zero tuple value_location; matching aliases keep the result shape self-describing.
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Summary
signal_latesttable (ReplacingMergeTree, model-garage 00010) instead of fanning out across every part of the ~97B-rowsignaltable.signal_summary/event_summary(AggregatingMergeTree, model-garage 00011).TestLatestQueriesUseProjection(asserted the projections being dropped in model-garage 00012).Evidence (prod, 2026-06-11)
Projections are stored per part, so latest-state reads inherit the ~140-part fan-out: signalsLatest via projection p50 = 2995ms (31,467 queries/day) vs raw primary-key reads p50 = 110ms. Point lookups on signal_latest target single-digit ms.
Rollout (order matters)
Test plan