feat: overlay-aware compaction scheduler and rewrite#7421

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wjones127 wants to merge 9 commits into

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wjones127:will/oss-1326-compaction-scheduler-thats-aware-of-overlays

Commits on Jun 23, 2026

docs: specify data overlay files for the table format

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feat: add DataOverlay transaction operation

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chore: compile against DataOverlay proto, reject unsupported overlays

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feat: data overlay file model, feature flag, and DataOverlay transaction

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feat: refuse reads of fragments with overlays until merge lands

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feat: overlay cell-resolution core (newest-first, rank, NULL override)

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feat(file): v2 writer/reader support columns of unequal length

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feat: resolve data overlay files on the take and scan read paths

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feat: overlay-aware compaction scheduler and rewrite

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