consistent checking of is_deleted, some small refactorings

routes/api/tree.js

@@ -12,14 +12,20 @@ const notes = require('../../services/notes');
 const sync_table = require('../../services/sync_table');
 
 router.get('/', auth.checkApiAuth, async (req, res, next) => {
-    const notes = await sql.getAll("SELECT "
-        + "notes_tree.*, "
-        + "notes.note_title, "
-        + "notes.is_protected "
-        + "FROM notes_tree "
-        + "JOIN notes ON notes.note_id = notes_tree.note_id "
-        + "WHERE notes.is_deleted = 0 AND notes_tree.is_deleted = 0 "
-        + "ORDER BY note_position");
+    const notes = await sql.getAll(`
+      SELECT 
+        notes_tree.*, 
+        notes.note_title, 
+        notes.is_protected
+      FROM 
+        notes_tree 
+      JOIN 
+        notes ON notes.note_id = notes_tree.note_id
+      WHERE 
+        notes.is_deleted = 0 
+        AND notes_tree.is_deleted = 0
+      ORDER BY 
+        note_position`);
 
     const dataKey = protected_session.getDataKey(req);