add deprecation notice for sql_random_function()

classes/Db.php

@@ -71,6 +71,7 @@ class Db {
 		return self::$instance->pdo;
 	}
 
+	/** @deprecated usages should be replaced with `RANDOM()` */
 	public static function sql_random_function(): string {
 		return "RANDOM()";
 	}

classes/RPC.php

@@ -269,8 +269,6 @@ class RPC extends Handler_Protected {
 		$updstart_thresh_qpart = 'AND (last_update_started IS NULL OR '
 			. Db::past_comparison_qpart('last_update_started', '<', 5, 'minute') . ')';
 
-		$random_qpart = Db::sql_random_function();
-
 		$pdo = Db::pdo();
 
 		// we could be invoked from public.php with no active session
@@ -290,7 +288,7 @@ class RPC extends Handler_Protected {
 				$owner_check_qpart
 				$update_limit_qpart
 				$updstart_thresh_qpart
-			ORDER BY $random_qpart LIMIT 30";
+			ORDER BY RANDOM() LIMIT 30";
 
 		$res = $pdo->query($query);
 

plugins/cache_starred_images/init.php

@@ -59,7 +59,7 @@ class Cache_Starred_Images extends Plugin {
 				site_url != '' AND
 				ttrss_user_entries.owner_uid = ? AND
 				plugin_data NOT LIKE '%starred_cache_images%'
-			ORDER BY ".Db::sql_random_function()." LIMIT 100");
+			ORDER BY RANDOM() LIMIT 100");
 
 		if ($sth->execute([$this->host->get_owner_uid()])) {