dance-lessons-coach/documentation/HISTORY.md

Development History

This document records the historical development phases of dance-lessons-coach. Extracted from the original AGENTS.md (Tâche 6 restructure) for lazy-loading compatibility with Mistral Vibe (128k context).

All phases below are completed ✅. They are kept here for traceability and onboarding context — refer to ADRs (adr/) for the technical decisions behind each phase.

Phase 1: Foundation

• Go 1.26.1 environment setup
• Project structure with cmd/ and pkg/ directories
• Core Greet service implementation
• CLI interface
• Unit tests

Phase 2: Web API

• Chi router integration
• Versioned API endpoints (/api/v1)
• Health endpoint (/api/health)
• JSON responses with proper headers

Phase 3: Logging & Architecture

• Zerolog integration with Trace level
• Context-aware logging
• Interface-based design patterns
• Dependency injection

Phase 4: Documentation & Testing

• Comprehensive AGENTS.md
• README.md with usage instructions
• Server management guide
• API endpoint documentation

Phase 5: Configuration Management

• Viper integration for configuration
• Environment variable support with DLC_ prefix
• Customizable server host/port
• Configurable shutdown timeout
• Configuration validation and logging
• Example configuration file

Phase 6: Graceful Shutdown

• Context-aware server initialization
• Signal-based termination (SIGINT, SIGTERM)
• Configurable shutdown timeout
• Readiness endpoint for Kubernetes/service mesh integration
• Proper resource cleanup during shutdown
• Health endpoint remains healthy during graceful shutdown

Phase 7: OpenTelemetry Integration

• OpenTelemetry Go libraries integration
• Jaeger compatibility for distributed tracing
• Middleware-only approach using otelhttp.NewHandler
• Configurable sampling strategies
• Graceful shutdown of tracer provider
• OTLP exporter with gRPC support

Phase 8: Build System & Documentation

• Build script for binary compilation
• Binary output to bin/ directory
• Comprehensive commit conventions with gitmoji reference
• Updated documentation with Jaeger integration guide
• Cleaned up configuration files
• Enhanced logging configuration with file output support

Phase 9: Final Refinements

• Removed unnecessary time.Sleep for log flushing
• Changed server operational logs from Info to Trace level
• Moved all logging setup logic to config package
• Simplified server entrypoint to 27 lines
• Verified all functionality with comprehensive testing
• Updated documentation to reflect final architecture

Beyond Phase 9

Subsequent work (CI/CD, BDD scenarios, ADR audit, JWT, config hot-reloading) is tracked in the Changelog and the corresponding ADRs.