Optimisations and updated readme

src/data/admin.js

@@ -1,6 +1,6 @@
 async function fetchAdminData(pool) {
-  const [playlists] = await pool.query('SELECT * FROM playlists ORDER BY id DESC');
-  const [canvasSizes] = await pool.query('SELECT * FROM canvas_sizes ORDER BY width ASC, height ASC, name ASC');
+  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');
+  const [canvasSizes] = await pool.query('SELECT id, name, width, height, created_at, modified_at, created_by, modified_by FROM canvas_sizes ORDER BY width ASC, height ASC, name ASC');
   const [templates] = await pool.query(`
     SELECT st.id, st.name, st.canvas_size_id, st.background_image_path, st.created_at, st.modified_at,
            cs.name AS canvas_size_name, cs.width AS canvas_size_width, cs.height AS canvas_size_height
@@ -8,16 +8,16 @@ async function fetchAdminData(pool) {
     LEFT JOIN canvas_sizes cs ON cs.id = st.canvas_size_id
     ORDER BY st.id DESC
   `);
-  const [templateRegions] = await pool.query('SELECT * FROM slide_template_regions ORDER BY template_id ASC, z_index ASC, id ASC');
+  const [templateRegions] = await pool.query('SELECT id, template_id, region_key, region_type, label, font_family, x, y, width, height, z_index, created_at, modified_at, created_by, modified_by FROM slide_template_regions ORDER BY template_id ASC, z_index ASC, id ASC');
   const [slides] = await pool.query(`
-    SELECT s.*, st.name AS template_name, cs.width AS canvas_width, cs.height AS canvas_height
+    SELECT s.id, s.title, s.body, s.template_id, s.content_json, s.media_path, s.media_type, s.created_at, s.modified_at, s.created_by, s.modified_by, st.name AS template_name, cs.width AS canvas_width, cs.height AS canvas_height
     FROM slides s
     LEFT JOIN slide_templates st ON st.id = s.template_id
     LEFT JOIN canvas_sizes cs ON cs.id = st.canvas_size_id
     ORDER BY s.id DESC
   `);
   const [screens] = 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
     ORDER BY s.id DESC