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https://github.com/Ranchero-Software/NetNewsWire.git
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33 lines
1.2 KiB
Markdown
33 lines
1.2 KiB
Markdown
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# Database Cleanup
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Old articles and statuses are removed after a certain period of time.
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(This applies to the OnMyMac account only. Other syncing systems have their own rules, and the app should follow them.)
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We do this so that the database doesn’t just grow forever. Because the bigger it gets, the slower it gets.
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The cleanup process is run at app launch, before other reads and writes. It should be fast enough that it goes unnoticed by the user.
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Articles are deleted first, then statuses.
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## Articles
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All articles whose feed is no longer in the subscriptions list are deleted.
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A cut-off date of 4 * 31 days ago is calculated.
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For the remaining articles, we go feed-by-feed.
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If a feed has 20 or fewer articles, it’s left alone.
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For each article (oldest first) delete until:
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The feed’s count of articles is down to 20,
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or the article is newer than the cut-off date.
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The reason we preserve some articles that would otherwise be deleted: you want to be able to select a feed that hasn’t been updated in a year (or whatever long period of time) and still articles from that feed.
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## Statuses
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Statuses older than five months (see statuses.dateArrived) with no matching articleID in articles are deleted.
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