Merge pull request #468 from GregThib/patch-1

Performance breakthrough

include/functions.php

@@ -320,8 +320,7 @@
 
 		// purge orphaned posts in main content table
 		$result = db_query("DELETE FROM ttrss_entries WHERE
-			(SELECT COUNT(int_id) FROM ttrss_user_entries WHERE ref_id = id) = 0");
-
+			id NOT IN (SELECT ref_id FROM ttrss_user_entries WHERE ref_id IS NOT NULL)");
 		if ($do_output) {
 			$rows = db_affected_rows($result);
 			_debug("Purged $rows orphaned posts.");