Keep track of the known topics in store#1951

Merged

gnprice merged 11 commits intozulip:mainfrom

sm-sayedi:1499-track-topics

Jan 2, 2026

Commits on Dec 31, 2025

topics: Introduce `Topics` model for tracking known channel topics

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autocomplete test [nfc]: s/streams/topics/ in a topic test name
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autocomplete test [nfc]: Add and use isTopic condition
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autocomplete: Use topic data from `Topics` model in topic autocomplete
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topics: Pass `maxId` to topic sheet only if the related message is still in topic

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topics: Keep topic-list page updated, by using data from `Topics` model

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