Comprehensive worktime tracking system with automated cost distribution: - WorktimeTracker core engine with flexible duration parsing and CRUD operations - CLI commands: log, list, daily, estimate, distribute, delete, update - Smart cost distribution algorithms (equal and activity-based) - Integration with existing cost period and activity tracking systems - Rich CLI interface with multiple output formats and comprehensive help - 35+ comprehensive test cases with full functionality coverage Key Features: - Multiple duration formats (1h30m, 90min, 1.5h) with intelligent parsing - Proportional cost allocation based on time investment ratios - Daily summaries with breakdown by issue and cost analysis - Automatic worktime estimation for days without detailed tracking - Full CRUD operations with data validation and error handling Technical deliverables: - 1,800+ lines of production code across 3 core files - Complete test suite with edge cases and integration scenarios - Database schema integration with proper indexing - Cost tracking: €0.552 for 120 minutes of development time 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>