[gitpod-db] add index on workspaceDB.Type Column

For Telemetry queries to be less intensive on the CPU, We need to
build Indexes to make the querying faster

Signed-off-by: Tarun Pothulapati <[email protected]>

Author: Pothulapati

components/gitpod-db/src/typeorm/entity/db-workspace.ts

@@ -70,6 +70,7 @@ export class DBWorkspace implements Workspace {
     })
     shareable?: boolean;
 
+    @Index("ind_type")
     @Column({
         default: "regular",
     })

components/gitpod-db/src/typeorm/migration/1647290507971-IndexWorkspaceType.ts

@@ -0,0 +1,23 @@
+/**
+ * Copyright (c) 2022 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";
+
+export class IndexWorkspaceType1647290507971 implements MigrationInterface {
+
+    public async up(queryRunner: QueryRunner): Promise<void> {
+        const TABLE_NAME = "d_b_workspace";
+        const TYPE_INDEX_NAME = "ind_type";
+        if (!(await indexExists(queryRunner, TABLE_NAME, TYPE_INDEX_NAME))) {
+            await queryRunner.query(`CREATE INDEX ${TYPE_INDEX_NAME} ON ${TABLE_NAME} (type)`);
+        }
+    }
+
+    public async down(queryRunner: QueryRunner): Promise<void> {
+    }
+
+}