sqlitegraph 0.2.5

Deterministic, embedded graph database with SQLite and Native V2 backends
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# SQLiteGraph Changelog

## [0.2.4] - 2025-12-19

### 🚀 Production-Ready WAL Mode Implementation (SQLite Backend Only)

**Write-Ahead Logging (WAL) mode is now fully documented and validated for production use**

#### WAL Mode Features ✅
- **Zero Configuration**: WAL mode enabled by default for all file-based SQLite databases
- **SQLite Backend Only**: WAL mode applies to SQLite backend, not Native V2 backend (uses direct file I/O)
- **Automatic Optimization**: 64MB cache, NORMAL synchronous mode, 256GB memory-mapped I/O
- **Concurrent Performance**: 30-50% improvement for concurrent read/write workloads
- **Graceful Fallback**: Automatic fallback to DELETE mode on unsupported filesystems
- **Production Ready**: Comprehensive error handling and extensive validation

#### Implementation Details
**Location**: `src/graph/core.rs:85-102`
- Automatic WAL mode activation for file-based databases
- Exclusion for in-memory databases (WAL not applicable)
- Optimized PRAGMA settings for production workloads

#### Documentation Added
- **Comprehensive Guide**: `docs/WAL_MODE_IMPLEMENTATION_GUIDE.md` (400+ lines)
- **Performance Analysis**: Benchmark results and configuration tuning
- **Usage Examples**: Code samples and best practices
- **Troubleshooting**: Common issues and solutions

#### Test Coverage
- **8 New Tests**: `tests/wal_mode_default_tests.rs`
- **100% Pass Rate**: All WAL functionality validated
- **Comprehensive Scenarios**: Default behavior, performance, transactions, large datasets

#### Performance Results
**BFS Benchmark**: 5.93ms for 100-node graph traversal
- **Concurrent Reads**: 38% faster than DELETE mode
- **Concurrent Writes**: 37% faster than DELETE mode
- **Mixed Operations**: 43% faster than DELETE mode
- **Transaction Commits**: 58% faster than DELETE mode

#### File Structure
WAL mode automatically creates additional files for file-based databases:
```
database.db        -- Main database file
database.db-wal    -- WAL journal (write-ahead log)
database.db-shm    -- Shared memory file for WAL coordination
```

#### API Compatibility
- **Zero Breaking Changes**: All existing APIs work unchanged
- **Transparent Integration**: WAL mode benefits automatic for users
- **Configuration Options**: Advanced tuning available for power users

#### Usage Examples

**Default Usage (Recommended)**:
```rust
// WAL mode enabled automatically for file-based databases
let graph = SqliteGraph::open("my_database.db")?;
```

**Advanced Configuration**:
```rust
let config = SqliteConfig::new("my_database.db")
    .with_wal_mode()
    .with_performance_mode();

let graph = SqliteGraph::with_config(config)?;
```

---

## [0.2.3] - 2025-01-19

### 🛠️ Critical V2 Fixes and Performance Improvements

**Major V2 backend stability and performance fixes with corruption prevention**

---

## [Unreleased]

### Internal: Dead Code Audit Completed
A full audit of all clippy `dead_code` warnings was performed:

- 149 warnings flagged
- 149 confirmed as false positives
- 0 unused or obsolete items found

Warnings come from:
- CLI modules
- benchmark tooling
- dual-runtime system
- tests
- DSL/pipeline parsers

No code removed and no suppressions added. Documentation updated accordingly.