Summary

Path-based import checkpoint replaces the pre-v0.34.2 positional checkpoint that silently lost files in three scenarios. Started as a cherry-pick of @garrytan-agents's PR #964 (sort files newest-first), expanded after /plan-eng-review + codex outside-voice surfaced two pre-existing P1 bugs in the checkpoint model that plan review missed.

Three bug classes closed:

• Parallel + slow worker: processed++ fires on completion not dispatch, so 4 workers + slow files[0] + 3 fast completions wrote processedIndex=3 and crash-resume sliced files.slice(3), dropping the slow file silently.
• Failed-file no-retry: errors++; processed++ both fire, so a failure pushed the checkpoint past the bad file. Next run skipped it. The "clear on clean exit" guard at line 268 only triggers when errors === 0, so a single failure preserved the bad checkpoint indefinitely.
• Sort-flip drop: v0.33.x's newest-first sort applied before checkpoint resume meant cross-version slice(processedIndex) dropped the N newest files on the upgrade run.

Fix: src/core/import-checkpoint.ts stores a set of completed relative paths. A file is "done" only when processFile returns success. Failed files never enter the set. Sort order is irrelevant to checkpoint correctness.

Commits:

• e4cc46e2 feat(import): path-based checkpoint resume + sort-newest-first helper
• ec750f5c chore: bump version and changelog (v0.34.2.0)
• a66088e3 docs: update project documentation for v0.34.2.0
• Includes 8dbcf6a5 (cherry-picked from PR feat(sync): sort files newest-first for faster salience on recent content #964 — @garrytan-agents)

Test Coverage

[+] src/core/sort-newest-first.ts
  └── sortNewestFirst()
      └── [★★★ TESTED] date-prefixed + mixed + empty + single + in-place — test/sort-newest-first.test.ts (5 cases)

[+] src/core/import-checkpoint.ts
  ├── loadCheckpoint()
  │   ├── [★★★ TESTED] missing + malformed + dir-mismatch + old-positional-with-stderr-log + bad-shape + valid v2 — test/import-checkpoint.test.ts (7 cases)
  ├── saveCheckpoint()
  │   ├── [★★★ TESTED] round-trip + deterministic-sorted + atomic-rename + non-fatal-on-EACCES (4 cases)
  ├── resumeFilter()
  │   ├── [★★★ TESTED] empty + partial + absolute-normalization + mixed + full-match (5 cases)
  └── clearCheckpoint()
      └── [★★  TESTED] present + missing (2 cases)

[M] src/commands/import.ts (path-based integration)
  └── runImport()
      ├── [★★★ TESTED] old positional → discard + stderr — test/import-resume.test.ts
      ├── [★★★ TESTED] v0.33.2 checkpoint → resume honored (skips known-completed)
      ├── [★★★ TESTED] clean completion → checkpoint cleared
      ├── [★★★ TESTED] failed file (SLUG_MISMATCH) → NOT in completed → next run retries
      └── [★★★ TESTED] dir mismatch → silent discard (no migration log)

[M] src/commands/sync.ts
  └── performSyncInner() — sortNewestFirst swap, no checkpoint logic affected

COVERAGE: 23/23 new code paths tested (100%)
QUALITY: ★★★:22 ★★:1 ★:0 | GAPS: 0

Tests: 6378 → 6384 (+6 new — 5 sort-helper + 18 checkpoint-helper + 5 integration. Some merged into existing files.)

Parallel-import regression test deferred to E2E (filed as TODO): real-Postgres parallel-mode requires DATABASE_URL setup; the unit-level runImport integration tests pin the path-based contract under serial execution. Plan calls this out explicitly.

Pre-Landing Review

3 issues found via /plan-eng-review — all resolved through implementation, not skipped:

• D1 (P1, conf 9/10): Checkpoint cross-version compatibility (the original sortVersion band-aid concern). Superseded by path-based design — sort order no longer matters to checkpoint correctness.
• D2 (P2, conf 8/10): Zero test coverage. Closed — 28 new tests + integration coverage of runImport.
• D3 (P1, conf 9/10): Codex pivot — parallel-import + failed-file pre-existing bugs that plan-eng-review missed. Closed by path-based design.

Outside Voice (Codex)

Ran codex exec against the draft plan. 5 substantive findings, all absorbed:

• P1: sortVersion only fixes one bug — parallel-import positional model is broken regardless → adopted path-based
• P1: failed files never retry under positional checkpoint → fixed by success-only completed.add
• P2: completedFiles was a count, not a list → dropped that field; new field is completedPaths: string[]
• P2: existing test duplicated predicate logic instead of testing production code → refactored to drive loadCheckpoint/saveCheckpoint/resumeFilter directly
• P2: existing test wrote to real ~/.gbrain → wrapped every case in withEnv({ GBRAIN_HOME: tmpdir() })

Cross-model agreement: yes — codex strictly expanded coverage. No unresolved disagreement.

Plan Completion

Plan file: ~/.claude/plans/velvety-sparking-treehouse.md. All actionable items DONE:

• src/core/sort-newest-first.ts created
• src/core/import-checkpoint.ts created with full API
• src/commands/import.ts refactored to path-based
• src/commands/sync.ts swapped for helper
• test/sort-newest-first.test.ts created
• test/import-checkpoint.test.ts created
• test/import-resume.test.ts refactored with GBRAIN_HOME isolation
• All verification gates: bun run verify clean, bun run test 6384/0/0

Deferred (filed in plan as TODOs):

• Append-only NDJSON sidecar checkpoint for >100K-file brains (perf optimization, not correctness — typical brain sizes are <50K)
• Real-Postgres E2E case for parallel-import + mid-stream crash + resume

TODOS

No items in TODOS.md were completed by this PR. (Existing TODOs are all v0.33.x functional-area-resolver follow-ups, unrelated to import checkpoints.)

Documentation

• CLAUDE.md — added Key Files entries for src/core/import-checkpoint.ts (new module: loadCheckpoint / saveCheckpoint / resumeFilter / clearCheckpoint, path-set checkpoint format, atomic .tmp+rename writes, GBRAIN_HOME-aware) and src/core/sort-newest-first.ts (single source of truth for the descending-lex sort shared by gbrain import and gbrain sync); new entry for src/commands/import.ts covering the v0.34.2.0 positional→path-set checkpoint refactor and the three bug classes it closes (parallel-slow-worker drop, failed-file-skip, sort-flip drop); updated src/commands/sync.ts entry to note the inline .sort() swap for sortNewestFirst(addsAndMods).
• llms-full.txt — regenerated via bun run build:llms (mandatory chaser per CLAUDE.md auto-derived rule; CI shard 1 test/build-llms.test.ts enforces freshness).
• README.md, TODOS.md — no updates needed (v0.34.2.0 is an internal bug fix with no new user-facing surface or TODO impact).

Test plan

• bun run verify clean (typecheck + 12 shell guards, post-merge)
• bun run test — 6384 pass / 0 fail / 0 skip, ~393s wall time (post-merge)
• All 28 new unit cases pass
• test/import-resume.test.ts PGLite integration cases pass (5/5)
• No ~/.gbrain writes in tests (test-isolation lint clean)
• E2E suite (bun run test:e2e) — skips gracefully without DATABASE_URL; existing sync E2E expected to pass since the sort change is positional, not semantic. Run pre-merge if shipping today.
• Manual smoke: plant an old-positional checkpoint, run gbrain import, confirm "Older checkpoint format detected" stderr log fires.

To take advantage of v0.34.2.0

gbrain upgrade handles this automatically — no manual step. The first gbrain import after upgrade against a pre-existing checkpoint will log Older checkpoint format detected — re-walking (cheap via content_hash) and walk the brain fresh. Re-walk is cheap because content_hash short-circuits unchanged files.

Co-Authored-By: Claude Opus 4.7 noreply@anthropic.com

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