feat(actions): List workflows that were executed once but got removed from the default branch (#37835)

models/actions/run_list.go

@@ -132,6 +132,18 @@ func GetStatusInfoList(ctx context.Context, lang translation.Locale) []StatusInf
 	return statusInfoList
 }
 
+// GetRunWorkflowIDs returns all distinct WorkflowIDs that have at least
+// one ActionRun in the given repo.
+func GetRunWorkflowIDs(ctx context.Context, repoID int64) ([]string, error) {
+	ids := make([]string, 0, 10)
+	return ids, db.GetEngine(ctx).Table("action_run").
+		Where(builder.Eq{"repo_id": repoID}).
+		Distinct("workflow_id").
+		Cols("workflow_id").
+		Asc("workflow_id").
+		Find(&ids)
+}
+
 // GetActors returns a slice of Actors
 func GetActors(ctx context.Context, repoID int64) ([]*user_model.User, error) {
 	actors := make([]*user_model.User, 0, 10)

models/actions/run_list_test.go

@@ -0,0 +1,24 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package actions
+
+import (
+	"testing"
+
+	"code.gitea.io/gitea/models/unittest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestGetRunWorkflowIDs(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	ids, err := GetRunWorkflowIDs(t.Context(), 4)
+	assert.NoError(t, err)
+	assert.Equal(t, []string{"artifact.yaml", "test.yaml"}, ids)
+
+	ids, err = GetRunWorkflowIDs(t.Context(), 999999)
+	assert.NoError(t, err)
+	assert.Empty(t, ids)
+}