Bug: Claude Code's transcript JSONL file accumulates duplicated context-
rebuild snapshots — the same entry re-printed with the SAME `uuid`. Without
dedup, session_turn / task_size / events double-count, and session_turn
becomes non-monotonic across episodes parsed at different file-growth
states. Live evidence: episodes-2026-05.jsonl lines 14/15/16 of the same
session showed session_turn 139 → 140 → 91 (backwards in time). Probe
on transcript 553717ec: 22400 entries, only 6074 unique uuid (68% dup
rate); real user prompts 264 total vs 92 unique-uuid.
Fix: parseLines now tracks a `seenUuid` Set and skips entries whose uuid
has already been encountered (keep-first). Entries without `uuid`
(synthetic test fixtures) pass through unchanged. All downstream functions
(findTurnStart, extractEnvironment, extractTaskSize, etc.) operate on the
deduped entries array, so the fix is single-point and total.
Tests: new `parseTranscript — uuid-dedup` describe block covers
(1) duplicated-uuid prompts collapse → session_turn counts once,
(2) distinct-uuid entries preserved (no over-dedup),
(3) no-uuid entries pass through (synthetic-fixture safety),
(4) duplicated-uuid assistant turns → tool_calls / files_touched counted once.
110/110 parser tests green (was 106).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Дмитрий
94f831f7d1