II-42 Beta 1
II-42 v0.2.5 is the Beta 1 release of the PostgreSQL-native BM25 engine with
optional SAE semantic postings in the same index. Exact BM25 remains the
default; sae = true enables model-backed retrieval through ii42_query(...).
This generation introduces page-native segmented storage, copy-on-write
publication, lexical-first semantic updates, and query-first background
convergence. Compatible published semantic accelerators remain usable while
maintenance prepares replacements; semantic retrieval is approximate and
eventual, not an exact-current matching-universe guarantee.
Downloads
- Linux x86-64 extension ZIPs for PostgreSQL 17 and 18.
- PostgreSQL 18 Linux x86-64 Docker archive for offline loading.
- A SHA-256 checksum file for each archive.
Packages and the Docker image include ONNX Runtime 1.29.0 and the frozen
default model. Model weights do not require a separate checkout when using
these release artifacts.
The container is publicly accessible without a registry login:
docker pull ghcr.io/intelligent-internet/ii-42:pg18-v0.2.5The moving aliases are ghcr.io/intelligent-internet/ii-42:pg18 and
ghcr.io/intelligent-internet/ii-42:latest. On 2026-09-08, these aliases and
the versioned tag were verified to resolve to:
sha256:25397fe71b3078f8e638f66de0af52eafa8dfc13a4cf0e70f6d85ea48a9a384f
Installation and Migration
Follow the installation guide
and upgrade boundaries.
Stop PostgreSQL before replacing a loaded II-42 shared-preload library or its
bundled runtime. Existing psql_bm25s installations require the documented
migration, not an in-place extension rename.
The public model repository
provides the model card, licenses, and checksum-locked source-build archive.
See the model report
and system report
for design, measured evidence, and future directions.
Verification
Release CI built and validated both PostgreSQL packages and the Docker image.
On 2026-09-08, anonymous container pull, BM25 and SAE index creation/query,
restart persistence, the ORT 1.29 contract, and all three archive checksums
were reverified. The existing release tag and binary artifacts were retained.
This is the default GitHub Latest release as of 2026-09-08. Beta 1 describes
product maturity; it is not marked as a GitHub pre-release. Promotion changed
only the release metadata and container aliases, not the tag or artifacts.
See the product changelog
for the deliberate comparison against the first public psql_bm25s v0.4.11
baseline. The version number reset accompanies the II-42 product rename.
Source comparison: v0.4.14...v0.2.5