---
gsd_state_version: 1.0
milestone: v10.0
milestone_name: API Refactoring
status: complete
stopped_at: v10.0 milestone complete
last_updated: "2026-03-30T14:00:00.000Z"
last_activity: 2026-03-30
progress:
  total_phases: 5
  completed_phases: 5
  total_plans: 5
  completed_plans: 5
---

# Project State

## Project Reference

See: .planning/PROJECT.md (updated 2026-03-30)

**Core value:** Clean API surface — structured types replace parameter soup.
**Status:** v10.0 COMPLETE. BarKey + ProcessingOptions + CacheOptions shipped.

## Current Position

Phase: 42 (Cleanup + Ship v10.0) — COMPLETE
Plan: 1 of 1
Status: Complete
Last activity: 2026-03-30

## Performance Metrics

**Velocity:**

- Total plans completed: 5
- Phase 39: BarKey + 27 CH functions (~25 min)
- Phase 40: Orchestration + kintsugi propagation (~20 min)
- Phase 41: ProcessingOptions + CacheOptions dataclasses
- Phase 42: Cleanup, docs, verification (~10 min)

## Accumulated Context

### Decisions

- v10.0: BarKey goes in types.py (new module), not clickhouse/cache.py
- v10.0: Expand-contract migration used in Phase 39, callers updated in Phase 40
- v10.0: Kintsugi Shard gets bar_key computed property
- [Phase 39]: BarKey uses function-level import to avoid circular imports
- [Phase 39]: deduplicate_bars special-cased with isinstance for None-able params
- [Phase 40]: orchestration functions construct BarKey, pass to CH calls
- [Phase 40]: checkpoint/engine.py updated to use BarKey
- [Phase 42]: PMD CPD count stable at 19 (BarKey reduces structural duplication, not token-level)
- [Phase 42]: Expand-contract verified — both old and new API patterns work

### Pending Todos

- #339: kintsugi 3-bar merge for writer-boundary orphans (separate fix, not v10.0)

### Blockers/Concerns

- #339 reopened: kintsugi misclassifies writer-boundary orphans as forming_boundary
- Needs 3-bar merge strategy in repair.py

## Session Continuity

Last session: 2026-03-30
Stopped at: v10.0 milestone complete
Resume file: None
