Optimisations and updated readme

src/data/screens.js

@@ -23,7 +23,7 @@ async function uniqueScreenSlug(pool, baseSlug) {
 
 async function fetchScreenById(pool, id) {
   const [rows] = await pool.query(`
-    SELECT s.*, p.name AS playlist_name
+    SELECT s.id, s.name, s.slug, s.playlist_id, s.created_at, s.modified_at, s.created_by, s.modified_by, p.name AS playlist_name
     FROM screens s
     LEFT JOIN playlists p ON p.id = s.playlist_id
     WHERE s.id = ?
@@ -32,7 +32,7 @@ async function fetchScreenById(pool, id) {
 }
 
 async function fetchScreenEditData(pool) {
-  const [playlists] = await pool.query('SELECT * FROM playlists ORDER BY id DESC');
+  const [playlists] = await pool.query('SELECT id, name, fade_between_slides, created_at, modified_at, created_by, modified_by FROM playlists ORDER BY id DESC');
   return { playlists };
 }