# Issue #168: Job steps tracking

## Objective

Implement job-steps module for granular step tracking within jobs. This module will track individual steps (SETUP, EXECUTION, VALIDATION, CLEANUP) within a runner job, recording status transitions, token usage, and duration.

## Approach

1. Analyze existing RunnerJobsModule and JobStep model
2. Create JobStepsModule with TDD approach
3. Implement service layer for step CRUD and status tracking
4. Implement controller with GET endpoints
5. Ensure proper integration with RunnerJobsModule

## Progress

- [x] Analyze existing code structure
- [x] Create directory structure and DTOs
- [x] RED: Write tests for JobStepsService
- [x] GREEN: Implement JobStepsService
- [x] RED: Write tests for JobStepsController
- [x] GREEN: Implement JobStepsController
- [x] Create JobStepsModule
- [x] REFACTOR: Clean up and optimize
- [x] Quality gates: typecheck, lint, test, coverage
- [x] Commit changes

## Testing

- Unit tests for service methods (13 tests)
- Unit tests for controller endpoints (3 tests)
- Mock Prisma service
- Verify token usage tracking
- Verify duration calculation
- Coverage: 100% statements, 100% functions, 100% lines, 83.33% branches

## Notes

- Step types: COMMAND, AI_ACTION, GATE, ARTIFACT
- Step phases: SETUP, EXECUTION, VALIDATION, CLEANUP
- Status transitions: pending → running → completed/failed
- Track token usage per step (for AI_ACTION steps)
- Calculate duration on completion

## Implementation Summary

Created the following files:

- `/home/jwoltje/src/mosaic-stack/apps/api/src/job-steps/job-steps.module.ts` - Module definition
- `/home/jwoltje/src/mosaic-stack/apps/api/src/job-steps/job-steps.service.ts` - Service with CRUD operations
- `/home/jwoltje/src/mosaic-stack/apps/api/src/job-steps/job-steps.controller.ts` - Controller with GET endpoints
- `/home/jwoltje/src/mosaic-stack/apps/api/src/job-steps/dto/create-step.dto.ts` - DTO for creating steps
- `/home/jwoltje/src/mosaic-stack/apps/api/src/job-steps/dto/update-step.dto.ts` - DTO for updating steps
- `/home/jwoltje/src/mosaic-stack/apps/api/src/job-steps/dto/index.ts` - DTO exports
- `/home/jwoltje/src/mosaic-stack/apps/api/src/job-steps/job-steps.service.spec.ts` - Service tests (13 tests)
- `/home/jwoltje/src/mosaic-stack/apps/api/src/job-steps/job-steps.controller.spec.ts` - Controller tests (3 tests)
- `/home/jwoltje/src/mosaic-stack/apps/api/src/job-steps/index.ts` - Module exports

Also fixed pre-existing issue in job-events DTO (added `!` to required properties).

## Quality Gates

- ✅ Build: Passed
- ✅ Lint: Passed (auto-fixed formatting)
- ✅ Tests: 16/16 passed
- ✅ Coverage: 100% statements, 100% functions, 100% lines, 83.33% branches