Add support for ARIES UNDO and constant time recovery#28

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gburd wants to merge 11 commits into

Commits on Jul 15, 2026

ci: fork upstream auto-sync

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ci: AI/LLM PR review (OCR via Bedrock + Agora MCP history)

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storage: add SeqLock, a sequence-lock reader/writer primitive
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UNDO: add table-AM capability flags for cluster-wide UNDO
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pgstat: let table AMs declare that UPDATE creates no dead tuple
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UNDO: add cluster-wide UNDO-in-WAL engine with per-relation UNDO fork
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UNDO: add nbtree and hash index UNDO apply handlers
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port: add pg_xattr extended-attribute portability wrapper
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FILEOPS: add transactional filesystem-ops WAL resource manager
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RECNO: add in-place MVCC table access method with heap-compatible xmin/xmax visibility
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[DO NOT MERGE] Benchmarks: RECNO and UNDO performance test suite
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