fixed const constraint default

backend/migrations/add_fp_submission_editing.js

@@ -41,9 +41,9 @@ db.serialize(() => {
         }
     );
 
-    // Add updated_at column
+    // Add updated_at column (SQLite requires constant defaults for ALTER TABLE, so default to NULL)
     db.run(
-        `ALTER TABLE ivanti_fp_submissions ADD COLUMN updated_at DATETIME DEFAULT CURRENT_TIMESTAMP`,
+        `ALTER TABLE ivanti_fp_submissions ADD COLUMN updated_at DATETIME DEFAULT NULL`,
         (err) => {
             if (err) {
                 if (err.message.includes('duplicate column')) {