basic entity support with lazy loaded relations

src/entities/note_tree.js

@@ -0,0 +1,15 @@
+"use strict";
+
+const Entity = require('./entity');
+
+class NoteTree extends Entity {
+    async getNote() {
+        return this.sql.getEntity("SELECT * FROM note_tree WHERE isDeleted = 0 AND noteId = ?", [this.noteId]);
+    }
+
+    async getParentNote() {
+        return this.sql.getEntity("SELECT * FROM note_tree WHERE isDeleted = 0 AND parentNoteId = ?", [this.parentNoteId]);
+    }
+}
+
+module.exports = NoteTree;