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M2: cursor-based resumable runs with merge-join against the parent

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TreeWalker walks one or more roots in a stable segment-wise order with
exclusions and resumes after a cursor; ParentCursor merge-joins the
previous snapshot in the same order. BackupRun no longer keeps a file
list or the parent's entries in memory or in its state.
This commit is contained in:
Dillard Blom
2026-10-02 00:46:31 +02:00
parent c3d9ad6041
commit bc5a589ed8
7 changed files with 344 additions and 105 deletions
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tests/.phpunit.result.cache
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