[dependabot]

Bumps redb from 4.3.0 to 4.4.0.

Release notes

Sourced from redb's releases.

4.4.0

New features

• Implement Value and Key for the NonZero integer types, NonZeroU8 to NonZeroU128 and NonZeroI8 to NonZeroI128.
• Add Value::NICHE, an optional byte string that a type never encodes to. When a type declares one, Option of that type encodes None as it, in place of a tag byte. Adding a niche to a type changes the encoding of Option of it, and its type name with it, so the two are not equivalent types: a table that stores Option of the type from before it declared the niche fails to open with TableTypeMismatch instead of being misread, and can be read through a copy of the type that declares no niche.
• Stabilize ReadableTable::lower_bound() and ReadableTable::upper_bound(), which return a read-only Cursor, modeled on the standard library's BTreeMap cursors.
• Stabilize Table::lower_bound_mut() and Table::upper_bound_mut(), which return a CursorMut modeled on the standard library's BTreeMap cursors. Inserting sorted data through insert_before() can be around 3x faster than insert().

Bug fixes

• Fix a bug where check_integrity() could report that it repaired corruption, after a transaction that grew the file size was aborted.
• Fix Database::create() repairing the database it had just created, which failed with RepairAborted under a repair callback that aborts.
• Fix unbounded memory growth in the page cache under write workloads, when the cache never reached its configured size limit.
• Fix Durability::None commits being lost on a clean close, after a panic was caught inside an earlier write transaction.
• Fix compact() leaving free regions at the end of the file, when the compaction emptied more of them than it made commits.
• Fix compact() waiting forever when the caller holds a write transaction. It fails with CompactionError::TransactionInProgress, as it does for a read transaction.

Changelog

Sourced from redb's changelog.

4.4.0 - 2026-10-13

New features

• Implement Value and Key for the NonZero integer types, NonZeroU8 to NonZeroU128 and NonZeroI8 to NonZeroI128.
• Add Value::NICHE, an optional byte string that a type never encodes to. When a type declares one, Option of that type encodes None as it, in place of a tag byte. Adding a niche to a type changes the encoding of Option of it, and its type name with it, so the two are not equivalent types: a table that stores Option of the type from before it declared the niche fails to open with TableTypeMismatch instead of being misread, and can be read through a copy of the type that declares no niche.
• Stabilize ReadableTable::lower_bound() and ReadableTable::upper_bound(), which return a read-only Cursor, modeled on the standard library's BTreeMap cursors.
• Stabilize Table::lower_bound_mut() and Table::upper_bound_mut(), which return a CursorMut modeled on the standard library's BTreeMap cursors. Inserting sorted data through insert_before() can be around 3x faster than insert().

Bug fixes

• Fix a bug where check_integrity() could report that it repaired corruption, after a transaction that grew the file size was aborted.
• Fix Database::create() repairing the database it had just created, which failed with RepairAborted under a repair callback that aborts.
• Fix unbounded memory growth in the page cache under write workloads, when the cache never reached its configured size limit.
• Fix Durability::None commits being lost on a clean close, after a panic was caught inside an earlier write transaction.
• Fix compact() leaving free regions at the end of the file, when the compaction emptied more of them than it made commits.
• Fix compact() waiting forever when the caller holds a write transaction. It fails with CompactionError::TransactionInProgress, as it does for a read transaction.

2.6.4 - 2026-10-02

• Fix unbounded memory growth in the page cache under write workloads, when the cache never reached its configured size limit.

Commits

• 7061f7e Bump version to 4.4.0
• 8c29eee Update changelog
• f403a51 Refuse to compact while a write transaction is live
• f26a843 Take the consistent byte before the open publishes the recovery flag
• 0bb989a Retry every fcntl lock request interrupted by a signal
• c849ed0 Drop every free trailing region when compacting
• faae676 Make non-durable commits durable when closing after a caught panic
• 87a17ff Update changelog
• f95d460 Bound the page cache LRU queue when the cache never fills
• e9d0c06 Do not repair a database in which nothing has been committed
• Additional commits viewable in compare view

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