v5.8.6

Fixed

• (version) refuse a snapshot read below the retained history (#617)

Performance

• (read) turn the row cache on by default, and take structured-zstd 0.0.51 (#624)
• (filter) solve the ribbon in registers, one word per row (#622)
• (tree) keep the point-read snapshot lookup inlinable (#620)

v5.8.5

Performance

• bench harness wall-clock fix and write hot-path audit (#606)

v5.8.4

Performance

• bench harness wall-clock fix and write hot-path audit (#606)

v5.8.3

Performance

• bench harness wall-clock fix and write hot-path audit (#606)

v5.8.2

Performance

• close the hot-path audit (ECC clean read, zero-copy columns, deterministic codegen) (#602)

v5.8.1

Documentation

• finalise the README and scope the no-conversion claim (#596)

Performance

• cut hot-path allocations across point reads, memtable and scans (#601)
• (vlog) read a scan's separated values ahead in coalesced runs (#599)

v5.8.0

Added

• (salvage) total recovery for SSTs and blob files with in-place ECC autoheal (#588)
• (columnar) tree-level projected columnar scan (#567)

Fixed

• (verify) judge a lone recognized ECC descriptor by the block framing (#592)

Performance

• (table) one block-read primitive, and fold the block-layout check into the reconcile walk (#595)
• (verify) run the reconcile gates on one decode per block (#590)

v5.7.0

Added

• (salvage) block-granular SST salvage (#560)
• (columnar) delete-density rewrite, read-path perf, backpressure + zstd fixes (#559)
• (fs) fault-injection harness and power-loss crash simulator (#555)
• compaction-debt write-backpressure verdict (#554)

Documentation

• README quick start, comparison table, and discoverability metadata (#565)

Performance

• (multi_get) coalesce a batch's block reads across SSTs (#563)

Testing

• (external-wal) reference implementation and end-to-end recipe test (#561)
• (format) cross-feature + cross-version compatibility matrix (#557)

v5.6.0

Added

• (no_std) bottommost compaction GC + verify scrub on the no_std path (#541)
• (columnar) accumulate ingest batches into one rowgroup (#537)
• (columnar) nullable value sub-columns and default values (#536)
• (columnar) consumer value sub-columns via columnar ingest (#531)
• positional delete-bitmap MVCC for columnar segments (#530)
• (columnar) vectorized columnar scan with projection and predicate pushdown (#525)
• (columnar) column-organized SST data blocks with on-flush transpose (#524)
• (columnar) intrinsic-field transpose between entries and ColumnBatch (#523)
• (columnar) PAX columnar block format and ColumnBatch read unit (#517)
• (tree) approximate range row-count + selectivity (#514)
• (tree) per-level / per-segment storage + access stats (#515)
• (tree) approximate range size/count estimate (#513)
• per-block zone-map section (#511)

Documentation

• external WAL contract and storage invariants reference (#546)
• (columnar) consumer sub-column schema evolution conventions (#539)

Fixed

• (table) replace saturating seqno arithmetic on the read path with checked (#538)
• (compaction) keep a range tombstone deleting a key with a later merge operand (#528)

Performance

• (filter) prefetch the ribbon coefficient window in the BuRR probe (#545)

Refactored

• coherent storage-statistics surface with compaction-debt and cache snapshot (#543)

Testing

• (oracle) extend the BTreeMap-oracle model harness to the full operation set (#526)
• (cache) demonstrate metadata-priority pin cuts filter reloads under churn (#516)

v5.5.0

Added

• (range) seekable range iterator + decompress-path zero-copy (#501)
• (compaction) tight-space compaction with in-place reclaim and blob defrag (#497)
• (compaction) deadlock-free space admission for merges (#493)
• (fs) Fs::available_space free-space probe + disk-pressure admission (#492)
• (storage) opt-in write admission control (#490)
• (storage) storage introspection API (capacity, K/V shape, remaining estimate) (#488)

Performance

• (range) in-place seekable re-seek without merge-stack rebuild + peek (#510)

Refactored

• audit and de-mask saturating arithmetic (#498)