routine: memory-deprecated-at (2026-07-24) - #116
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promote() already records promoted_at; deprecate_live() recorded a reason but not a timestamp, so the audit trail couldn't answer "how long has this been deprecated" without re-deriving it from the event log. Mirrors Claude Code 2.1.214's addition of a modified timestamp to memory file frontmatter (2026-07-18). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Smd58WtDGyWszXyEcVbG6h
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Summary
MemoryStore.promote()already stampspromoted_aton the entries it moves to live, butdeprecate_live()only recorded adeprecated_reason— no timestamp. This adds adeprecated_at: Optional[float]field toMemoryEntryand stamps it indeprecate_live(), giving the audit trail parity: "how long has this entry been deprecated" is now a direct field read instead of a re-derivation from the event log.modifiedtimestamp to memory file frontmatter."csis/contracts.py(MemoryEntry.deprecated_at),csis/memory/store.py(deprecate_live()),tests/test_memory.py(new regression test)Coordinator.__init__,_BackendTracker,writer_iteration_id, promotion CAS); the field is optional and backward-compatible, matching the existingwriter_iteration_idoptional-field pattern.Test plan
python -m pytest tests/ -q— 251 passed (was 250; addedtest_deprecate_live_stamps_deprecated_at)deprecated_atis populated within a[before, after]window around thedeprecate_live()callOpened by the CSIS daily-improvement routine per
.claude/routines/daily-improvement.md. Full day's triage (including deferred items) lands inbrain/routines/2026-07-24.mdvia a separate log PR.Generated by Claude Code