CHANGELOG

Added — Enterprise Engine

• MVCC Concurrency — Multi-Version Concurrency Control. Readers never block writers. Write-write conflicts surface as ConflictError instead of deadlocking.
• DashMap Auto-Scaling — Replaced fixed stripe Vec<Mutex<()>> with lock-free DashMap that auto-scales with CPU cores. Configurable via stripeCount.
• mmap O(1) Startup — Memory-mapped file loading via memmap2. Near-instant open regardless of database size. Tunable via bufferPoolSizeMB and bufferPageSizeKB.
• .explain() API — Query introspection returning scanType, filtersApplied, sortApplied, matchedCount, executionTimeMs, and more.
• WAL Replication — Stream WAL entries to replicas with CRC32 integrity verification. Async and sync acknowledgment modes.
• Point-in-Time Recovery (PITR) — Archive WAL files and restore data to any previous timestamp via createSnapshot() / restoreSnapshot().
• Zero-Copy N-API Streams — Chunked result streaming prevents V8 GC spikes with large result sets.
• Pluggable Storage Adapters — adapters.ts: StorageAdapter interface + FileSystemAdapter, MemoryAdapter, LocalStorageAdapter, IndexedDBAdapter, HttpAdapter.
• WASM Fallback — Tier 3 loading: automatically falls back to wasm-shim.js when no native binary is present and Rust is unavailable. 100% install success.
• Lite Mode Build — bun run build:lite: WASM-only distribution <2MB for Lambda / edge / browser.
• Prebuilt Binaries — Binaries for Linux (x64/arm64 gnu+musl), macOS (x64/arm64/universal), Windows (x64/arm64). All live in prebuilds/.
• CI & npm Publish — New ci.yml workflow: builds all platforms, runs tests, publishes to npm with provenance on release tags.

Changed

• index.js rewritten — all .node binaries resolved from prebuilds/ via a prebuild() helper.
• scripts/build-on-demand.js — output directory changed to prebuilds/ (auto-created).
• .gitignore — prebuilds/*.node tracked (negation), internal planning docs and lite/ ignored.
• Write throughput updated to ~545k ops/s (was ~260k in v4.x).

Rust Dependencies Added

• memmap2 = "0.9", crc32fast = "1.3", dashmap = "6", lru = "0.12"

Fixed

• Minor type declaration alignment for walStatus() return type.
• Improved error messages for schema validation failures.

Added

• Native Query Engine — Full query pipeline in Rust: filter → sort → skip → limit → select in a single N-API call. Up to 20× faster than JS fallback.
• Smart Memory Management — LRU-based cold storage eviction. memoryLimit, coldStorageDir, evictionThresholdPct, evictionTargetPct options. offload(), restore(), memoryStats(), checkMemoryPressure() APIs.
• Striped Write Locks — 64-stripe collection-level lock manager. Writes to different collections proceed concurrently. Deadlock-free batch locking via sorted stripe acquisition.
• Parallel aggregation and parallel join added to Rayon query layer.

Changed

• Write throughput nearly doubled (~545k vs ~260k ops/s) due to striped concurrency.

Added

• Schema Validation — JSON Schema-like field constraints: type, enum, minimum, maximum, pattern, minLength, maxLength, minItems, maxItems, uniqueItems, required.
• slowQueryThresholdMs option to automatically log slow queries.

Added — Hybrid Architecture

• Configurable Durability Modes — none, lazy, batched (Group Commit WAL), sync.
• Process Locking — OS-level advisory file locking: exclusive, shared, none.
• walFlushMs, walBatchSize, lockTimeoutMs options for fine-grained tuning.
• sync() for explicit durability flush.
• walStatus() to inspect WAL enabled state and committed LSN.

Added — Multi-Core

• Multi-core parallel processing via Rayon: parallelQuery(), parallelAggregate(), parallelLookup(), batchSetParallel().
• getSystemInfo() — runtime CPU and parallelism diagnostics.
• Adaptive parallelism: single-threaded for <100 items, parallel for ≥100 items.

Added

• TTL — setWithTTL(), setTTL(), getTTL(), clearTTL(), hasTTL().
• Pub/Sub — subscribe(), on('change') with wildcard pattern matching.
• Snapshots — createSnapshot(), restoreSnapshot().
• Transactions — transaction() with automatic rollback.
• Middleware — before(), after() hooks on all operations.
• Encryption — AES-256-GCM at rest via encryptionKey.
• Pagination — paginate().
• Aggregations — sum(), avg(), min(), max(), distinct(), groupBy().
• O(1) Indices — define in constructor, query via findByIndex().

Added

• push(), pull() — array helpers.
• add(), subtract() — atomic math operations.
• find(), findAll() — predicate and object-matcher search.
• Chainable query builder: query().where().sort().limit().skip().select().exec().
• batch() — multi-operation write.
• keys(), values(), count(), stats().

Added

• Initial release: Rust N-API core via NAPI-RS.
• set(), get(), has(), delete(), save(), close().
• Automatic nested path creation, JSON file persistence.