[orgs] Add index for slug (#16920)

Part of #16856

Author: AlexTugarev

components/gitpod-db/src/typeorm/migration/1679312926829-OrganizationSlugIndex.ts

@@ -0,0 +1,24 @@
+/**
+ * Copyright (c) 2023 Gitpod GmbH. All rights reserved.
+ * Licensed under the GNU Affero General Public License (AGPL).
+ * See License.AGPL.txt in the project root for license information.
+ */
+
+import { MigrationInterface, QueryRunner } from "typeorm";
+import { indexExists } from "./helper/helper";
+
+const table = "d_b_team";
+const column = "slug";
+const idxSlug = "idx_slug";
+
+export class OrganizationSlugIndex1679312926829 implements MigrationInterface {
+    public async up(queryRunner: QueryRunner): Promise<void> {
+        if (!(await indexExists(queryRunner, table, idxSlug))) {
+            await queryRunner.query(`CREATE INDEX \`${idxSlug}\` ON \`${table}\` (${column})`);
+        }
+    }
+
+    public async down(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(`DROP INDEX ${idxSlug} ON ${table};`);
+    }
+}