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After the TDLib 1.8.50 → 1.8.64 upgrade, the worker now correctly enumerates all forum topics in MPE (1,086 of them) — a huge win. But a data-shape mismatch was about to bite us: TDLib changed how the General topic is identified. TDLib 1.8.50: info.message_thread_id = 1048576 (magic constant) TDLib 1.8.64: info.forum_topic_id = 1 Existing topic_progress rows for General carry topicId=1048576. The worker looks up progress via `topicProgressList.find(tp => tp.topicId === topic.topicId)`, which fails for General under the new TDLib → progress becomes null → the scan starts from message 0. For MPE specifically, that means re-scanning all ~378k General-topic messages. Dedup catches the previously-ingested ones (no double upload), but it burns hours of bandwidth before the watermark catches up. Fix: when topicId lookup misses for a topic named "General", fall back to a name match. The first watermark write after that saves under the new ID (1), so future runs hit the topicId match directly without the fallback. The orphaned 1048576 row stays as harmless dead data — we don't delete it in case a TDLib downgrade or revert ever happens. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>