> For the complete documentation index, see [llms.txt](https://bucketdb.sullux.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bucketdb.sullux.com/reference/change-log.md).

# Change Log

All notable changes to this project will be documented in this file.

## v0.2.0 (Phase 1-4 Architecture Update)

### Features

* **Immutable Block Storage:** Transitioned to an entirely immutable physical data structure mapped over Object Storage (S3, Memory, File).
* **Write-Forward Service & Caching:** Added an in-memory batched log overlay (`committed/` prefix) to support Read-After-Write consistency and background storage merging.
* **B+Tree Indexes:** Replaced simple mappings with robust Copy-on-Write (CoW) B+Trees for fast exact-match lookups.
* **Query Optimizer:** Added background reservoir sampling to support condition selectivity scoring and execution plan generation with a Mock Query Executor.
* **Timesharing Concurrency:** Implemented a MISC clock-driven timesharing mechanism allowing decentralized, lockless writes across multiple concurrent nodes.
* **Managed Blobs:** Added native support for binary Blob interception via the `db.Blob()` wrapper, asynchronous uploading, and tombstone-based Garbage Collection.
* **Snapshots:** Introduced zero-cost time-travel snapshots based on `Block 0` versioning and time-range bounded garbage collection logic.
* **Blue/Green Migrations:** Background block rewrites for safe, zero-downtime schema migrations via the Storage-Level Migration Daemon.

### Breaking Changes

* Replaced the legacy monolithic `createDatabase()` instantiation logic with a modular, dependency-injected `BucketDb()` factory.
* Schemas are now strictly enforced and require a discrete `registerSchema()` step before any table can be queried or written to.
* Writes must now occur through the `db.batch()` API instead of direct table inserts.

## v0.1.0 Alpha

*Initial Alpha Release*


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