From 566f92ab735b489e660bda1ded6106673ab1d892 Mon Sep 17 00:00:00 2001
From: Hazelnoot <acomputerdog@gmail.com>
Date: Sat, 24 May 2025 18:28:07 -0400
Subject: [PATCH] add IDX_instance_host_key

---
 ...48104955717-index_IDX_instance_host_key.js | 20 +++++++++++++++++++
 packages/backend/src/models/Instance.ts       |  1 +
 2 files changed, 21 insertions(+)
 create mode 100644 packages/backend/migration/1748104955717-index_IDX_instance_host_key.js

diff --git a/packages/backend/migration/1748104955717-index_IDX_instance_host_key.js b/packages/backend/migration/1748104955717-index_IDX_instance_host_key.js
new file mode 100644
index 0000000000..3c3b779298
--- /dev/null
+++ b/packages/backend/migration/1748104955717-index_IDX_instance_host_key.js
@@ -0,0 +1,20 @@
+/*
+ * SPDX-FileCopyrightText: hazelnoot and other Sharkey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export class IndexIDXInstanceHostKey1748104955717 {
+	name = 'IndexIDXInstanceHostKey1748104955717'
+
+	async up(queryRunner) {
+		await queryRunner.query(`CREATE UNIQUE INDEX "IDX_instance_host_key" ON "instance" (((lower(reverse("host")) || '.')::text) text_pattern_ops)`);
+
+		// Flush all cached Linear Scan Plans and redo statistics for expression index
+		// this is important for Postgres to learn that even in highly complex queries, using this index first can reduce the result set significantly
+		await queryRunner.query(`ANALYZE "instance"`);
+	}
+
+	async down(queryRunner) {
+		await queryRunner.query(`DROP INDEX "IDX_instance_host_key"`);
+	}
+}
diff --git a/packages/backend/src/models/Instance.ts b/packages/backend/src/models/Instance.ts
index c64ebb1b3b..5d8108d423 100644
--- a/packages/backend/src/models/Instance.ts
+++ b/packages/backend/src/models/Instance.ts
@@ -6,6 +6,7 @@
 import { Entity, PrimaryColumn, Index, Column } from 'typeorm';
 import { id } from './util/id.js';
 
+@Index('IDX_instance_host_key', { synchronize: false })
 @Entity('instance')
 export class MiInstance {
 	@PrimaryColumn(id())