fix(gateway): skip oversized JSONL lines to prevent event-loop starvation

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Large transcript JSONL records (multi-MB tool results, file content)
block the event loop via JSON.parse before truncation logic can skip
them. Add a 256 KiB line-size guard to parseTailTranscriptRecord and
extractUsageSnapshotFromTranscriptLine, and replace the full transcript
index scan in readSessionTitleFieldsFromTranscriptAsync with the
existing bounded sync reader.

Observed improvement on a production install (33 sessions):
chat.history dropped from 13-16s to ~1.2s, event loop utilization
from 0.999 to normal, steady-state CPU from ~100% to 0.2-0.3%.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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This commit is contained in:

Marvinthebored

2026-05-03 11:01:41 +08:00

committed by Vincent Koc

parent d122a3492d

commit 4c9a557533

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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