Below are useful extensions for the wp-config.php file.
define('WP_HOME','https://ihredomain.de'); //WordPress address (backend)
define('WP_SITEURL','https://ihredomain.de'); //Webpage address (home page)
define('WP_POST_REVISIONS', 5); //Number of maximum stored revisions
define('WP_POST_REVISIONS', false); //Revisions will not be saved
define('AUTOSAVE_INTERVAL', 30); //Automatic save every 30 seconds (default 60)
define('EMPTY_TRASH_DAYS', 60); //Every 60 days the recycle bin will be emptied
define('EMPTY_TRASH_DAYS', 0); //The recycle bin will be emptied immediately
define('WP_CACHE', true); //Enable the internal cache of WordPress
define('WP_MEMORY_LIMIT', '128M'); //Set the main memory in MByte which is available for WordPress
define('WP_MEMORY_LIMIT', '8M'); //Increase upload limit to for example 8, 16, 32, 64, 128 MB
define( 'WP_EMOICONS', false ); //Disable emojis
define( 'IMAGE_EDIT_OVERWRITE', true ); //Overwrites existing same images
define('DISALLOW_FILE_EDIT', TRUE ); //Prevent editing of files in the editor
define('FORCE_SSL_LOGIN', true ); //forceSSL login
define('AUTOMATIC_UPDATER_DISABLED', true); //Disable automatic updates
define( 'WP_AUTO_UPDATE_CORE', false ); //Disable all automatic WordPress updates