feat: Add status to step model and adjust executeFlow accordingly

packages/backend/src/db/migrations/20220205145128_add_status_to_steps.ts

@@ -0,0 +1,13 @@
+import { Knex } from 'knex';
+
+export async function up(knex: Knex): Promise<void> {
+  return knex.schema.table('steps', (table) => {
+    table.string('status').notNullable().defaultTo('incomplete');
+  });
+}
+
+export async function down(knex: Knex): Promise<void> {
+  return knex.schema.table('steps', (table) => {
+    table.dropColumn('status');
+  });
+}