diff --git a/backend/repository/instance.go b/backend/repository/instance.go
index 5ba6e7d749..7403f769b1 100644
--- a/backend/repository/instance.go
+++ b/backend/repository/instance.go
@@ -13,18 +13,26 @@ type Instance struct {
 	Name string
 }
 
+type SetUpInstance func(ctx context.Context, instance *Instance) error
+
 type InstanceSetuper interface {
 	SetUp(ctx context.Context, instance *Instance) error
 }
 
+type InstanceByID func(ctx context.Context, id string) (*Instance, error)
+
 type instanceByIDQuerier interface {
 	ByID(ctx context.Context, id string) (*Instance, error)
 }
 
+type InstanceByDomain func(ctx context.Context, domain string) (*Instance, error)
+
 type instanceByDomainQuerier interface {
 	ByDomain(ctx context.Context, domain string) (*Instance, error)
 }
 
+type ListInstances func(ctx context.Context) ([]*Instance, error)
+
 type InstanceLister interface {
 	List(ctx context.Context) ([]*Instance, error)
 }