fix: add an index to the ActionRun.stopped column (#8252)

The models/actions/run.go:GetRunBefore function sorts ActionRun rows to get the most recently stopped. Since the ActionRun rows do not expire, the cost will keep increasing over time.

The index is meant to ensure the execution time of the associated query does not grow linearly with the number of rows in the ActionRun table.

Ref https://codeberg.org/forgejo/forgejo/pulls/7491/files#issuecomment-5495441

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8252
Reviewed-by: Christopher Besch <mail@chris-besch.com>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>

models/forgejo_migrations/migrate.go

@@ -107,6 +107,8 @@ var migrations = []*Migration{
 	NewMigration("Add federated user activity tables, update the `federated_user` table & add indexes", FederatedUserActivityMigration),
 	// v33 -> v34
 	NewMigration("Add `notify-email` column to `action_run` table", AddNotifyEmailToActionRun),
+	// v34 -> v35
+	NewMigration("Add index to `stopped` column in `action_run` table", AddIndexToActionRunStopped),
 }
 
 // GetCurrentDBVersion returns the current Forgejo database version.

models/forgejo_migrations/v35.go

@@ -0,0 +1,19 @@
+// Copyright 2025 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package forgejo_migrations //nolint:revive
+
+import (
+	"forgejo.org/modules/timeutil"
+
+	"xorm.io/xorm"
+)
+
+func AddIndexToActionRunStopped(x *xorm.Engine) error {
+	type ActionRun struct {
+		ID      int64
+		Stopped timeutil.TimeStamp `xorm:"index"`
+	}
+
+	return x.Sync(&ActionRun{})
+}