# Changelog Archive: v0.3.x Series

## [v0.3.4] - 2025-08-16

### Added
- **Hybrid Grep Command**
  - Semantic search capability integrated into grep command
  - Shows both "Text Matches" (regex) and "Semantic Matches" sections
  - `--regex-only` flag to disable semantic search when needed
  - `--semantic-limit` option to control number of semantic results (default: 3)
  - Automatic parallel execution of regex and semantic searches for better performance

- **Enhanced Vector Search**
  - Query embedding generation for accurate semantic search
  - Automatic embedding generator creation based on available models
  - Improved search accuracy with actual query vectors instead of placeholders
  - Default embedding support through factory pattern

- **Automatic Embedding Generation**
  - Vector database auto-creation on initialization
  - Repair thread auto-starts when missing embeddings detected
  - Background embedding generation without manual intervention
  - Proactive database initialization to avoid "Not found" messages

### Fixed
- **Vector Database Initialization**
  - Fixed auto-creation of vectors.db on first run
  - Repair thread now triggers during storage initialization
  - Improved embedding health detection with better sampling
  - Correct variable names in initialization code (metadataRepo_ vs metadataRepository_)

### Changed
- **Search Command**
  - Now uses hybrid search by default with vector and keyword fusion
  - Ignores --type flag for better ergonomics (hybrid is always best)
  - Automatic fallback to keyword search if vector search unavailable

## [v0.3.3] - 2025-08-15

### Added
- **MCP Server**
  - Spec-compliant stdio framing (Content-Length + CRLF) with readiness notifications
  - Tool schemas aligned with implementation and tests
  - MCP tool handlers refactored into thin adapters that map JSON ↔ service DTOs
  - CLI/MCP parity via shared service layer (Search, Grep, Document); MCP now delegates:
    - grep_documents → GrepService
    - list_documents, retrieve_document, update_document_metadata, get_by_name, cat_document, delete_by_name → DocumentService
- **Tracy Profiling Support**
- **List Command Enhancements**
  - `--changes` flag to show documents with recent modifications (last 24h by default)
  - `--since` option to show documents changed since specified time (ISO8601, relative, or natural formats)
  - `--diff-tags` flag for grouped change visualization showing added/modified/deleted documents
  - `--show-deleted` flag to include deleted documents in listings
  - File type indicators in diff-tags output showing `[extension|bin/txt|category]` for all files
- **Grep Command Enhancements**
  - Support for searching specific file paths in addition to patterns
  - Improved path matching with suffix lookup for partial paths
  - `--paths-only` flag for LLM-friendly output (one file path per line)

- **Code Quality**
  - Added clang-format configuration for consistent code style
  - Pre-commit hook for automatic code formatting
  - Application services layer for shared CLI/MCP functionality

### Fixed
- **MCP Server Initialization**
- **Vector Database**: Simplified embedding generation using existing repair command patterns
- Stats no longer unconditionally recommends 'yams repair --embeddings' when embeddings already exist; guidance is shown only when count is zero
- **Stats Display**: Improved embedding system status to show meaningful health info instead of misleading zero-activity counters
- **Vector Index**: Fixed initialization with smart dimension detection from existing models and databases
- **Async Processing**: Documents now get embeddings generated asynchronously in detached threads (non-blocking)
- **Reliability**: Embedding generation now works by default, if it fails you will see ```yams repair --embeddings``` in ```yams status```
- **Stats Command**: Replaced confusing worker activity counters with clear system capability status
- **List Command Filtering**: Fixed diff-tags logic to properly skip change filters when showing diff visualization

- **Security**
  - Fixed command injection vulnerability in model_command.cpp by replacing system() calls with safe execvp()
  - Added path validation and sanitization for user inputs
  - Validate output paths to prevent directory traversal attacks

## [v0.3.2] - 2025-08-15

### Added
- **Preview: Vector Database (experimental)**
  - `SqliteVecBackend` for persistent vector storage via the sqlite-vec extension
  - BLOB storage format for embeddings with transaction-safe writes across vector and metadata tables
  - CLI integration: enable via `yams init` or follow prompts shown in `yams stats --health`
- **MCP Server**
  - Stdio transport only; HTTP framework dependencies removed
### Fixed
- **Vector DB**
  - Embeddings now persist across restarts
  - Updated CRUD operations for new two-table architecture
- **Build/CI**
  - Fixed Conan ARM64 architecture detection on macOS self-hosted runner
- **MCP**
  - Removed Drogon and Boost dependencies that caused runtime issues

### Notes
- **Usage**
  - Vector search is off by default. Initialize and configure embeddings with `yams init` or via health prompts in `yams stats --health`.
- **Requirements**
  - SQLite with the sqlite-vec extension available at runtime.
- **Limitations (preview)**
  - Schema and APIs may change between minor versions.
  - Not enabled by default; indexing currently targets text documents only.
  - Single-process/local database only; no cross-process index sharing yet.

## [v0.3.1] - 2025-08-14

### Fixed
- **Critical: Missing ref_transactions table after init**
  - Fixed incomplete schema initialization in reference counter that caused "no such table: ref_transactions" error
  - Added complete inline schema fallback with all required tables (ref_transactions, ref_transaction_ops, ref_statistics, ref_audit_log)
  - Implemented proper resource file discovery for production deployments
  - Added installation of SQL schema files to CMake configuration
- **CI/CD Workflow Simplification**
  - Removed all cross-compilation logic from release workflow
  - Fixed CI build failures on Linux (gtest cache corruption) and macOS (runner detection)
  - Moved macOS x86_64 builds to GitHub hosted runners (macos-13)
  - Docker builds now use native architecture on each runner (ARM on macOS, x86 on Linux)

### Changed
- **Build Infrastructure**
  - All builds now use native compilation for better performance and reliability
  - Simplified Conan configuration by removing cross-compilation complexity
  - Docker workflow split into separate jobs per architecture for efficiency
  - Data files (magic_numbers.json, reference_schema.sql) now properly installed with binary

## [v0.3.0] - 2025-08-14

### Added
- **Apple Silicon Optimizations**
  - New `YAMS_ENABLE_APPLE_SILICON_OPTIMIZATIONS` CMake option (enabled by default on ARM64 Macs)
  - Native `-mcpu=apple-m1` optimization flag for M1/M2/M3 processors
  - Added `-fvectorize` for improved SIMD utilization on Apple Silicon

### Fixed
- **CI/CD C++ Standard Configuration**
  - Fixed Conan profile resetting to C++17 in CI/CD workflows
  - Added explicit C++20 enforcement after `conan profile detect --force`
  - Fixed cross-compilation profile configurations for both CI and Release workflows