change query

database/migrations/20260720000001-remove-is-required-from-tasks.js

@@ -0,0 +1,24 @@
+'use strict';
+
+// The order_index/is_required linear sequencing lock (added in
+// 20260709000005-add-order-index-and-is-required-to-tasks) is redundant now
+// that tasks have an explicit prerequisite graph (task_prerequisites, added
+// in 20260717000001-create-task-prerequisites). Locking a task is now purely
+// a function of its task_prerequisites rows — a task with none is never
+// implicitly locked by its position in the list. order_index is kept as a
+// display-order-only column.
+
+module.exports = {
+  async up(queryInterface) {
+    await queryInterface.removeColumn('tasks', 'is_required');
+  },
+
+  async down(queryInterface, Sequelize) {
+    await queryInterface.addColumn('tasks', 'is_required', {
+      type: Sequelize.BOOLEAN,
+      allowNull: false,
+      defaultValue: true,
+      after: 'order_index',
+    });
+  },
+};