Revert "Fix schedule tasks bugs (go-gitea#28691)" (part 2)

This function is now being used elsewhere and cannot be reverted. Only
the part that was modified in addition to being moved is deleted.

(cherry picked from commit 72954836a492f552ccc03250ba560951eedc199d)
(cherry picked from commit 86f4d1871e5605c1592cb83b178f8ebe69ccdfa8)
(cherry picked from commit 8089076ee2434a5f8b0abc11c0c06b5425fb7c14)

.deadcode-out

@@ -324,6 +324,7 @@ package "code.gitea.io/gitea/services/pull"
 
 package "code.gitea.io/gitea/services/repository"
 	func IsErrForkAlreadyExist
+	func UpdateRepositoryUnits
 
 package "code.gitea.io/gitea/services/repository/archiver"
 	func ArchiveRepository

services/repository/setting.go

@@ -0,0 +1,38 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package repository
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unit"
+)
+
+// UpdateRepositoryUnits updates a repository's units
+func UpdateRepositoryUnits(ctx context.Context, repo *repo_model.Repository, units []repo_model.RepoUnit, deleteUnitTypes []unit.Type) (err error) {
+	ctx, committer, err := db.TxContext(ctx)
+	if err != nil {
+		return err
+	}
+	defer committer.Close()
+
+	// Delete existing settings of units before adding again
+	for _, u := range units {
+		deleteUnitTypes = append(deleteUnitTypes, u.Type)
+	}
+
+	if _, err = db.GetEngine(ctx).Where("repo_id = ?", repo.ID).In("type", deleteUnitTypes).Delete(new(repo_model.RepoUnit)); err != nil {
+		return err
+	}
+
+	if len(units) > 0 {
+		if err = db.Insert(ctx, units); err != nil {
+			return err
+		}
+	}
+
+	return committer.Commit()
+}