# V2-P20 Closeout Checklist

Status: Complete

## Scope
Quality hardening pass:
- critical model correctness fixes
- graph edge-log write locking
- graph/schema/API consistency cleanup
- exception hygiene improvements with logged fallbacks

## Completion checklist
- [x] Replaced deprecated `datetime.utcnow()` defaults with timezone-aware UTC timestamps
- [x] Hardened `from_dict` for `Bead`, `Association`, `Event` to ignore unknown keys
- [x] Preserved `detail` in Bead round-trip serialization
- [x] Added store-lock protection for graph edge-log append paths
- [x] Aligned relation schema/model set with graph weighting (`causes`)
- [x] Clarified `build_graph(...)` side effects and added `evict_semantic_over_k` control
- [x] Added/updated tests for model parsing and graph behavior
- [x] Added logged fallback behavior for key fail-safe exception paths
- [x] Step 5 sweep completed

## Regression evidence
Command:

```bash
python3 -m unittest \
  tests.test_models \
  tests.test_models_schema_alignment \
  tests.test_graph_build \
  tests.test_graph_structural \
  tests.test_graph_semantic \
  tests.test_graph_traversal \
  tests.test_graph_backfill \
  tests.test_memory_engine \
  tests.test_continuity_injection_authority \
  tests.test_search_form_module_primary \
  tests.test_pre_oss_matrix -v
```

Result:
- 31 passed / 0 failed

## Outcome
Core Memory quality and robustness issues from the review memo were addressed without changing the core architecture model.
