kshitijk4poor
53559aaf86
fix(agent): protect batch-compaction markers from micro supersede/defrag
...
Phase 2 review findings on the salvage branch:
C1 (critical): batch and micro summary markers share
COMPRESSED_SUMMARY_METADATA_KEY, and compress() never reset micro state.
After micro absorbed exchanges 1..k, a batch compaction summarizing
1..m (m>k) could fire; the next micro pass's supersede then dropped the
batch marker (whose content the stale rolling summary does NOT contain)
and archive_and_compact immediately made the loss durable. Defrag had
the same hazard: it rewrote "the newest marker" even if that was a
batch marker. Empirically confirmed with a probe (batch marker content
destroyed in one pass).
Fix, three parts:
- Micro-created markers now carry MICRO_COMPACT_MARKER_KEY; supersede
and defrag only ever touch micro-tagged markers. Rehydration in
_resolve_compact_cursor tags the marker it absorbs (containment
proof), which safely covers adopting a batch marker as the new
rolling base after a reset.
- compress() success path resets micro rolling summary/cursor state so
a stale summary can never claim cumulativeness over a batch marker.
- Regression tests for both directions plus the reset.
W4: _splice_micro_compact_result no longer strips _db_persisted stamps
from surviving messages. Micro archives in place under the SAME session
id (unlike batch's child-session rotation, #57491 ), so surviving stamps
are accurate; stripping them meant an archive_and_compact failure left
every previously-persisted message unstamped and the next append-only
flush re-inserted them all as duplicate active rows.
W5: finalize_turn micro gate now checks agent._persist_disabled —
persistence-isolated fork agents (background review) must not burn an
aux call per review turn, and must never archive_and_compact the
canonical session rows if their compressor ever gains a DB binding.
W1: _serialize_one_exchange now delegates to _serialize_for_summary
(was a ~70-line near-verbatim copy; one serializer, one place to fix).
S4: _find_one_exchange boundary guard rejects only assistant/tool
boundaries (the actual alternation hazard) instead of requiring user —
a stray mid-list system/injected message can no longer wedge the
cursor forever.
5 new regression tests; 38 micro/prune tests, 400 compression-suite
tests, 61 finalize/persist tests pass; ruff clean.
2026-07-31 17:44:19 +05:30
..
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