Delete articles older than the 90-day window.

Frameworks/ArticlesDatabase/ArticlesDatabase.swift

@@ -216,6 +216,7 @@ public final class ArticlesDatabase {
 
 	/// Calls the various clean-up functions.
 	public func cleanupDatabaseAtStartup(subscribedToWebFeedIDs: Set<String>) {
+		articlesTable.deleteOldArticles()
 		articlesTable.deleteArticlesNotInSubscribedToFeedIDs(subscribedToWebFeedIDs)
 	}
 }

Frameworks/ArticlesDatabase/ArticlesTable.swift

@@ -458,6 +458,24 @@ final class ArticlesTable: DatabaseTable {
 
 	// MARK: - Cleanup
 
+	/// Delete articles that we won’t show in the UI any longer
+	/// — their arrival date is before our 90-day recency window.
+	/// Keep all starred articles, no matter their age.
+	func deleteOldArticles() {
+		queue.runInTransaction { databaseResult in
+
+			func makeDatabaseCalls(_ database: FMDatabase) {
+				let sql = "delete from articles where articleID in (select articleID from articles natural join statuses where dateArrived<? and starred=0);"
+				let parameters = [self.articleCutoffDate] as [Any]
+				database.executeUpdate(sql, withArgumentsIn: parameters)
+			}
+
+			if let database = databaseResult.database {
+				makeDatabaseCalls(database)
+			}
+		}
+	}
+
 	/// Delete articles from feeds that are no longer in the current set of subscribed-to feeds.
 	/// This deletes from the articles and articleStatuses tables,
 	/// and, via a trigger, it also deletes from the search index.