Refactor code structure for improved readability and maintainability

backend/scripts/checkDrawingData.js

@@ -0,0 +1,38 @@
+import PredefinedActivity from '../models/PredefinedActivity.js';
+import sequelize from '../database.js';
+
+async function check() {
+  try {
+    await sequelize.authenticate();
+    const rows = await PredefinedActivity.findAll({ attributes: ['id', 'name', 'drawingData'] });
+    const invalid = [];
+    for (const r of rows) {
+      const id = r.id;
+      const name = r.name;
+      const raw = r.drawingData;
+      if (raw == null) continue;
+      if (typeof raw !== 'string') {
+        invalid.push({ id, name, reason: 'not-string', raw: String(raw).slice(0, 200) });
+        continue;
+      }
+      try {
+        JSON.parse(raw);
+      } catch (e) {
+        // If raw looks like an object literal without quotes, consider invalid
+        invalid.push({ id, name, reason: 'invalid-json', error: e.message, raw: raw.slice(0, 200) });
+      }
+    }
+    if (invalid.length === 0) {
+      console.log('No invalid drawingData found.');
+    } else {
+      console.log('Invalid drawingData rows:');
+      invalid.forEach(i => console.log(JSON.stringify(i)));
+    }
+  } catch (err) {
+    console.error('Script error', err);
+  } finally {
+    await sequelize.close();
+  }
+}
+
+check();