The 9-quarter precompute_features run OOM-killed at ~56Gi on the
ci-compile-cpu pool (POP2-HC-32C-64G) on 2026-05-16. Root cause:
lines 672-684's `t.iter().map(...).collect()` borrows the source
DbnTrade Vec while building the Mbp10Trade Vec — both alive
simultaneously, transient peak ~25GB just from this transformation
for the 199M-trade dataset.
`.into_iter()` consumes the source element-by-element so the
allocation drops as the destination grows, capping peak at the
larger of the two Vecs (~15GB) rather than their sum.
Should let the 9-quarter precompute fit comfortably on the existing
64GB ci-compile-cpu pool without provisioning a high-memory node.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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