Module index Changelog

WARNING: Historical changelog entries describe implementation state at the time they were recorded.

Changelog - Index Module

All notable changes to the index module are documented here. The format is based on Keep a Changelog.

[Unreleased]

Changed

• Documentation governance sync: README, ARCHITECTURE, SECURITY, ROADMAP, FUTURE_ENHANCEMENTS, AUDIT, and PERFORMANCE_EXPECTATIONS aligned to source-verifiable module behavior.
• Performance expectations updated to explicit verified index benchmark symbols from vector, GPU-vector, rebuild, spatial, quantization, and radius-search benchmark suites.
• Process-graph multi-model query and critical-path traversal now reduce avoidable allocations/lookups (hashed edge-type filtering, DFS stack/path pre-reserve, and single-lookup duration/adjacency access).
• Process-graph JSON parsing now routes through a shared typed parser helper in query/join/aggregate/geo/multi-model flows, replacing silent catch-all suppression with contextual debug diagnostics while preserving empty-object fallback behavior.
• Graph-index edge encryption parsing, edge weight/type decode paths, and temporal field parsing now emit contextual THEMIS_DEBUG diagnostics on parse/decode failures instead of silently swallowing exceptions while preserving existing fallback behavior.
• Tiered index migration results now expose diagnostic codes plus source/target path context, and successful migrations refresh lifecycle metadata (last_access, access_count) to avoid stale follow-up state after tier changes.
• GPU vector backend discovery now reports Vulkan alongside CPU/CUDA/HIP availability, and backend switches preserve existing CPU-side index state instead of duplicating vectors or leaving the index torn down after a failed transition.
• TieredIndexManager migration pass pre-allocates the results vector to snapshot size and listIndexesByTier pre-allocates to registry size, avoiding incremental reallocation under large registry loads.

Fixed

• TieredIndexManager doMigrate(): export/import callback exceptions are now caught and converted to structured MigrationResult::Err (with EXPORT_FAILED/IMPORT_FAILED diagnostic codes and source/target path context) instead of propagating out of the migration pass and leaving the registry in an undefined partially-migrated state.

[1.8.0] - 2026-03-24

Added

• Matryoshka truncation support and focused benchmark/test coverage for advanced vector retrieval paths.

[1.7.0] - 2026-03-01

Added

• index compression surfaces and GPU memory oversubscription support.

[1.6.0] - 2026-02-01

Added

• multi-GPU/distributed vector and tiered migration capabilities.

Changed

• incremental reindexing and advisor behavior refinement.

Fixed

• backend-specific stability issues in mixed hardware paths.

[1.5.0] - 2025-09-01

Added

• full-text indexing and adaptive advisor support.

Changed

• HNSW and composite index tuning behavior.

Fixed

• high-concurrency vector connectivity/correctness issues.

[1.4.0] - 2025-03-01

Added

• spatial indexing and additional quantization pathways.

Changed

• HNSW filtered-search and PQ behavior refinement.

Fixed

• quantization assignment correctness issues.

[1.3.0] - 2024-09-01

Added

• GPU acceleration surfaces for vector operations.

Changed

• tenant/key isolation and persistence behavior hardening.

Fixed

• backend resource lifecycle and synchronization issues.

[1.0.0] - 2024-01-01

Added

• foundational HNSW vector indexing and persistent lookup support.

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