feat: write migration to make roles unique by key

packages/backend/src/db/migrations/20240903110620_make_role_key_unique.js

@@ -0,0 +1,11 @@
+export async function up(knex) {
+  return await knex.schema.alterTable('roles', (table) => {
+    table.unique('key');
+  });
+}
+
+export async function down(knex) {
+  return await knex.schema.alterTable('roles', function (table) {
+    table.dropUnique('key');
+  });
+}