diff --git a/models/migrations/migrations.go b/models/migrations/migrations.go
index 298ff60467..0a7a64336c 100644
--- a/models/migrations/migrations.go
+++ b/models/migrations/migrations.go
@@ -405,7 +405,7 @@ func prepareMigrationTasks() []*migration {
 		newMigration(328, "Add TokenPermissions column to ActionRunJob", v1_26.AddTokenPermissionsToActionRunJob),
 		newMigration(329, "Add unique constraint for user badge", v1_26.AddUniqueIndexForUserBadge),
 		newMigration(330, "Add name column to webhook", v1_26.AddNameToWebhook),
-		newMigration(331, "Add runner capacity and job max-parallel support", v1_26.AddRunnerCapacityAndJobMaxParallel),
+		newMigration(331, "Add job max-parallel support", v1_26.AddJobMaxParallel),
 	}
 	return preparedMigrations
 }
diff --git a/models/migrations/v1_26/v331.go b/models/migrations/v1_26/v331.go
new file mode 100644
index 0000000000..d2fa98ca4e
--- /dev/null
+++ b/models/migrations/v1_26/v331.go
@@ -0,0 +1,17 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_26
+
+import "xorm.io/xorm"
+
+// AddJobMaxParallel adds max_parallel to action_run_job with a composite index on (run_id, job_id).
+func AddJobMaxParallel(x *xorm.Engine) error {
+	type ActionRunJob struct {
+		RunID       int64  `xorm:"index index(idx_run_id_job_id)"`
+		JobID       string `xorm:"VARCHAR(255) index(idx_run_id_job_id)"`
+		MaxParallel int    `xorm:"NOT NULL DEFAULT 0"`
+	}
+
+	return x.Sync(new(ActionRunJob))
+}