Remove index on`jira_connect_subscriptions`

This is a duplicated index.

Changelog: performance

db/post_migrate/20231122123408_drop_idx_jira_connect_subscriptions_on_installation_id.rb

+# frozen_string_literal: true
+
+class DropIdxJiraConnectSubscriptionsOnInstallationId < Gitlab::Database::Migration[2.2]
+  disable_ddl_transaction!
+
+  milestone '16.7'
+
+  INDEX_NAME = :idx_jira_connect_subscriptions_on_installation_id
+  TABLE_NAME = :jira_connect_subscriptions
+
+  def up
+    remove_concurrent_index_by_name TABLE_NAME, INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index TABLE_NAME, :jira_connect_installation_id, name: INDEX_NAME
+  end
+end

db/schema_migrations/20231122123408

+75d01df223e1fa0b20cf2dac10a473e2d5dd96e6f77682adef5ed586b9c98fb0
\ No newline at end of file

db/structure.sql

@@ -31357,8 +31357,6 @@ CREATE INDEX idx_issues_on_project_work_item_type_closed_at_where_closed ON issu
 CREATE INDEX idx_issues_on_state_id ON issues USING btree (state_id);
-CREATE INDEX idx_jira_connect_subscriptions_on_installation_id ON jira_connect_subscriptions USING btree (jira_connect_installation_id);
-
 CREATE UNIQUE INDEX idx_jira_connect_subscriptions_on_installation_id_namespace_id ON jira_connect_subscriptions USING btree (jira_connect_installation_id, namespace_id);
 CREATE INDEX idx_keys_expires_at_and_before_expiry_notification_undelivered ON keys USING btree (date(timezone('UTC'::text, expires_at)), before_expiry_notification_delivered_at) WHERE (before_expiry_notification_delivered_at IS NULL);

spec/support/helpers/database/duplicate_indexes.yml

@@ -91,9 +91,6 @@ issue_links:
 issues:
   index_issues_on_author_id_and_id_and_created_at:
     - index_issues_on_author_id
-jira_connect_subscriptions:
-  idx_jira_connect_subscriptions_on_installation_id_namespace_id:
-    - idx_jira_connect_subscriptions_on_installation_id
 list_user_preferences:
   index_list_user_preferences_on_user_id_and_list_id:
     - index_list_user_preferences_on_user_id