[db] Better index DBWorkspace

- ind_creationTime: creationTime
- ind_contentDeletion: (contentDeletedTime, creationTime)
- ind_softDeletion: (softDeletedTime, softDeleted)

Author: geropl

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

@@ -11,6 +11,8 @@ import { TypeORM } from "../typeorm";
 import { Transformer } from "../transformer";
 
 @Entity()
+@Index("ind_contentDeletion", ["contentDeletedTime", "creationTime"])
+@Index("ind_softDeletion", ["softDeletedTime", "softDeleted"])
 // on DB but not Typeorm: @Index("ind_lastModified", ["_lastModified"])   // DBSync
 export class DBWorkspace implements Workspace {
     @PrimaryColumn(TypeORM.WORKSPACE_ID_COLUMN_TYPE)

components/gitpod-db/src/typeorm/migration/1637587650752-IndexWorkspaceGCQueries.ts

@@ -0,0 +1,27 @@
+import {MigrationInterface, QueryRunner} from "typeorm";
+import { indexExists } from "./helper/helper";
+
+export class IndexWorkspaceGCQueries1637587650752 implements MigrationInterface {
+
+    public async up(queryRunner: QueryRunner): Promise<void> {
+        const TABLE_NAME = "d_b_workspace";
+        const CREATION_TIME_INDEX_NAME = "ind_creationTime";
+        if (!(await indexExists(queryRunner, TABLE_NAME, CREATION_TIME_INDEX_NAME))) {
+            await queryRunner.query(`CREATE INDEX ${CREATION_TIME_INDEX_NAME} ON ${TABLE_NAME} (creationTime)`);
+        }
+
+        const CONTENT_DELETION_INDEX_NAME = "ind_contentDeletion";
+        if (!(await indexExists(queryRunner, TABLE_NAME, CONTENT_DELETION_INDEX_NAME))) {
+            await queryRunner.query(`CREATE INDEX ${CONTENT_DELETION_INDEX_NAME} ON ${TABLE_NAME} (contentDeletedTime, creationTime)`);
+        }
+
+        const SOFT_DELETION_INDEX_NAME = "ind_softDeletion";
+        if (!(await indexExists(queryRunner, TABLE_NAME, SOFT_DELETION_INDEX_NAME))) {
+            await queryRunner.query(`CREATE INDEX ${SOFT_DELETION_INDEX_NAME} ON ${TABLE_NAME} (softDeletedTime, softDeleted)`);
+        }
+    }
+
+    public async down(queryRunner: QueryRunner): Promise<void> {
+    }
+
+}