Ad column to tasks table

packages/database/src/migrations/20240813211928-AddParentTaskColumn-modifies-schema.js

@@ -0,0 +1,45 @@
+'use strict';
+
+var dbm;
+var type;
+var seed;
+
+/**
+ * We receive the dbmigrate dependency from dbmigrate initially.
+ * This enables us to not have to rely on NODE_PATH.
+ */
+exports.setup = function (options, seedLink) {
+  dbm = options.dbmigrate;
+  type = dbm.dataType;
+  seed = seedLink;
+};
+
+exports.up = async function (db) {
+  await db.addColumn('task', 'parent_task_id', {
+    type: 'text',
+    foreignKey: {
+      name: 'task_parent_task_id_fk',
+      table: 'task',
+      mapping: 'id',
+      // Don't cascade delete, as we want to keep the task even if the parent task is deleted, just set as null
+      rules: {
+        onDelete: 'SET NULL',
+        onUpdate: 'CASCADE',
+      },
+    },
+    ifNotExists: true,
+  });
+  return db.runSql(` 
+    CREATE INDEX IF NOT EXISTS task_parent_task_id_fk ON task USING btree (parent_task_id); 
+  `);
+};
+
+exports.down = function (db) {
+  return db.removeColumn('task', 'parent_task_id', {
+    ifExists: true,
+  });
+};
+
+exports._meta = {
+  version: 1,
+};