joaoh82 / rust_sqlite / 25341664142

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push

github

Committed by web-flow

Commit Message

feat(storage): free-list + VACUUM to reclaim orphan pages (SQLR-6) (#89)

DROP TABLE / DROP INDEX / ALTER TABLE DROP COLUMN now route the dropped
object's pages onto a persisted free-page list (header bytes [28..32],
chained `FreelistTrunk` pages, format version v6 on demand). Subsequent
saves draw from the freelist before extending the file, so unrelated
tables keep their page numbers across drops and the diff pager skips
their byte-identical re-stages. `VACUUM;` (new SQL statement) compacts
the file by ignoring the freelist and allocating contiguously from
page 1, then double-checkpoints so the on-disk shrink is visible
immediately.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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