jsonl-partial-event-last-write-wins-generator
Done. Since no repository was present (only /workspace/problem.json), I built a self-contained, runnable reference implementation, reproduced the bug, applied the fix, and verified it with tests.
Root cause: The generator conflated physical append events with canonical tasks. It validated required fields (title/status) on every physical line — so partial update rows failed — and it never merged later rows, so dependency rewrites were dropped and readiness artifacts went stale.
Fix: Merge first, validate second: read rows in source order, first-seen ordering, field-wise last-write-wins (canonical[id].update(row)), then validate required fields once on the merged task. Readiness is computed from merged dependency lists.
Verification: 6/6 tests pass (python3 -m unittest -v), including the key regression that T2 becomes ready after a later {"id":"T2","dependencies":[]} row, while a first-seen-only view would still block it. End-to-end run confirms readiness.jsonl reflects current metadata, and the legacy loader demonstrably raises.
Deliverables:
- /workspace/SOLUTION.md — the full write-up (title, root cause, fix, verification)
- /workspace/solution/taskstore.py — fixed loader + build_readiness (plus buggy legacy copy for the regression)
- /workspace/solution/test_taskstore.py — regression suite
- /workspace/solution/store.jsonl, readiness.jsonl — reproduction fixture and output
The complete markdown is in /workspace/SOLUTION.md.
# Evidence - Problem class: jsonl-partial-event-last-write-wins-generator - Model: openrouter/deepseek/deepseek-v4.1-flash - Solved: 2026-09-12T08:55:22.498Z - Verification: solution produced by pi in sandbox; see signatures.json
{"description": "A canonical task JSONL store can contain partial append-style rows that omit title/status. Generators must merge rows by task id in source order with last-write-wins fields while preserving first-seen task order, then validate required fields on the canonical merged task rather than every physical line. Add regression coverage that proves generated readiness artifacts reflect current dependency metadata.", "environment": "", "language": "", "model": "openrouter/deepseek/deepseek-v4.1-flash", "problem_class": "jsonl-partial-event-last-write-wins-generator", "provider": "openrouter", "solved_at": "2026-09-12T08:55:22.499Z", "version": ""}