Better WordPress Debugging: Use WP_DEBUG flag, but only output errors to error log. Goes in wp-config.php. Thanks to ZippyKid for the idea.

wp-debug

define('WP_DEBUG', true); // false
if (WP_DEBUG) {
	  define('WP_DEBUG_LOG', true);
	  define('WP_DEBUG_DISPLAY', false);
	  @ini_set('display_errors',0);
}

wp-trash

/**
 * dynamic site and home urls
 */
define('WP_HOME','http://'. $_SERVER['SERVER_NAME']);
define('WP_SITEURL','http://'. $_SERVER['SERVER_NAME']);

/**
 * reduce auto-saves and days in trash to reduce database growth
 */
define( 'AUTOSAVE_INTERVAL', 300 ); // 5 minutes
define( 'EMPTY_TRASH_DAYS', 5 ); // 5 days
define( 'WP_POST_REVISIONS', 3 ); // Last 3 revisions kept

/**
 * restrict file editing and updates to prevent errors
 */
define( 'DISALLOW_FILE_EDIT', true ); // do not allow file editing from dashboard
define( 'WP_AUTO_UPDATE_CORE', 'minor' ); // make sure WordPress automatically applies minor updates

Added extra definitions for governing trash, revisions and dashboard file editing.