Archive cleanup:

- remove code to manually archive/unarchive articles
- remove ttrss_archived_feeds/orig_feed_id handling - the whole thing was implemented for
this data to be kept indefinitely; it doesn't make a lot of sense to deal with this stuff
now that it is expired after one month anyway (same reasons as feed browser being removed - privacy)
- remove "originally from"-related stuff because of the above
- also remove unused remaining frontend/backend code related to feed browser (rip)

classes/rssutils.php

@@ -1379,18 +1379,11 @@ class RSSUtils {
 		}
 	}
 
+	// deprecated; table not used
 	static function expire_feed_archive() {
-		Debug::log("Removing old archived feeds...");
-
 		$pdo = Db::pdo();
 
-		if (DB_TYPE == "pgsql") {
-			$pdo->query("DELETE FROM ttrss_archived_feeds
-				WHERE created < NOW() - INTERVAL '1 month'");
-		} else {
-			$pdo->query("DELETE FROM ttrss_archived_feeds
-				WHERE created < DATE_SUB(NOW(), INTERVAL 1 MONTH)");
-		}
+		$pdo->query("DELETE FROM ttrss_archived_feeds");
 	}
 
 	static function expire_lock_files() {