Index item_id properly on task-results

migrations/20210320222335_indexes.js

@@ -0,0 +1,15 @@
+"use strict";
+
+module.exports.up = function(knex, Promise) {
+	return knex.schema
+		.alterTable("task_results", (table) => {
+			table.index("item_id");
+		});
+};
+	
+module.exports.down = function(knex, Promise) {
+	return knex.schema
+		.alterTable("task_results", (table) => {
+			table.dropIndex("item_id");
+		});
+};