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perf: early-exit channel scan when all messages are below watermark

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searchChatMessages returns newest-first. Once the oldest message on a
page is at or below the lastProcessedMessageId boundary, all remaining
pages are even older. Stop scanning immediately instead of reading every
message in the channel.

This was already implemented for topic scans but missing from channel
scans. On a test run, total messages scanned dropped from 3805 to 1615
(57% reduction) for an account with no new archives.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
xCyanGrizzly
2026-05-04 19:58:30 +02:00
parent d6c82ede1e
commit 35cce3151c
1 changed files with 5 additions and 0 deletions
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5
worker/src/tdlib/download.ts
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@@ -246,6 +246,11 @@ export async function getChannelMessages(
fromMessageId = result.messages[result.messages.length - 1].id;
if (result.messages.length < Math.min(limit, 100)) break;
// Early exit: searchChatMessages returns newest-first. Once the oldest
// message on this page is at or below the boundary, all remaining pages
// are even older — no new messages exist, stop scanning immediately.
if (boundary && fromMessageId <= boundary) break;
await sleep(config.apiDelayMs);
}
}