feat(migrations): drop per-part latest projections (v1.0.14 — HOLD until telemetry-api switch + 24h soak)#264
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Superseded by signal_latest (00010) and the summary tables (00011). Projections are stored per part, so latest-state reads through them fan out across all ~140 parts of the signal table — measured p50 ~3s in prod vs ~110ms for raw primary-key reads. Dropping also removes the projection rebuild cost from every merge.
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Drops
signal_latest_by_subject_source_nameandevent_latest_by_subject_source_nameand resetsdeduplicate_merge_projection_mode. Superseded by signal_latest/summary tables (#263).HARD GATE — do not merge/tag until:
Dropping while anything still emits projection-matched shapes sends those queries to full-history scans (~10s, the original incident — worse than the ~3s projection path).
Stacked on #263; retarget to main after it merges. Tag v1.0.14 from this merge.