Adopt SlateDB 0.12.x (UniFFI bindings)

[em3s]

Background

Follows #155 (experimental integration complete). Upstream has since moved to 0.12.x, replacing jextract bindings with UniFFI (io.slatedb:slatedb-uniffi, still Java 22+).

This issue tracks the work of adopting 0.12.x in actionbase.

Prerequisites

• Full build migration to Java 25 (v0.5.0)
• Metastore consolidation (v0.6.0)
• Raise the storage backend abstraction level
  • Introduce StorageBackend abstraction layer #173
  • Replace DefaultHBaseCluster with DefaultStorageBackendFactory #175

Scope

• Port SlateDbConnections/SlateDbStorage/SlateDbTable from jextract API to UniFFI API
• Update artifact coordinate (io.slatedb:slatedb → io.slatedb:slatedb-uniffi)
• Re-validate against existing compatibility tests

Next

Once this lands, an Adopt SlateDB milestone will be created for the follow-up lightweight-deployment work (Docker standalone profile, docs, rollout).

[em3s]

cc @criccomini

[em3s]

Status (2026-04-26)

#280 closed as experiment-success — third pass after #163 (2026-03-04) and #155 (2026-04-21). Each round verified SlateDB integrates cleanly; each closed without merge because adoption prerequisites weren't yet in place.

Adoption resumes once v0.5.0 / v0.6.0 reduce tech debt and make storage backend extension easier:

• Java 25 build migration (v0.5.0)
• Metastore consolidation (v0.6.0)
• Storage backend abstraction (Introduce StorageBackend abstraction layer #173 / Replace DefaultHBaseCluster with DefaultStorageBackendFactory #175)

next/slatedb-uniffi preserved for the next attempt; Adopt SlateDB milestone will be created when prerequisites near completion.

[em3s]

Closing. Tracked in #281.