[Pigbibi]

Summary

Fix heartbeat candidate publication when a completed business window spans two UTC months and one archive partition has no matching objects. Move the existing prepublication Storage SDK reader into the archive module and reuse it for heartbeat reads. Successful empty listings reach the existing schedule check; permission, timeout and malformed JSON failures still abort. Missing due reports remain failures.

Keep bounded reads, generation-pinned downloads and existing candidate merge/write behavior. Add synthetic cross-month tests for empty partitions, unrelated reports, preserved executed reports and failed paginated reads.

Verification

• Focused heartbeat-reader, prepublication and diagnostic suites: 64 passed.
• Repository-wide Ruff: passed.
• Documentation check: passed with the existing README outline advisory (zero blocking findings).
• Full offline regression suite: 1747 passed, 118 subtests passed. Default cloud credential discovery was disabled with a deliberately nonexistent credentials-file path; all assertions remained enabled.
• Independent read-only AI review of the complete base-to-head diff: no actionable findings; reviewer independently observed the 64 focused tests passing.

Risk: ordinary notification code. Storage behavior is verified offline with synthetic clients; production publication and deployment were not exercised. An uncertain write still requires inspection before any retry.

AI assistance

Authored with OpenAI Codex (GPT-6.1 Sol). A separate Codex agent reviewed the complete four-file change and relevant callers at the submitted head, including SDK empty-list semantics, schedule guards and failure propagation. Review evidence is retained outside Git. This draft does not authorize deployment or operational actions.

[coderabbitai]

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