diff --git a/internal/command/instance_domain_test.go b/internal/command/instance_domain_test.go
index 923bcf347e..e2e5ecabb7 100644
--- a/internal/command/instance_domain_test.go
+++ b/internal/command/instance_domain_test.go
@@ -133,7 +133,7 @@ func TestCommandSide_AddInstanceDomain(t *testing.T) {
 								newOIDCAppChangedEventInstanceDomain(context.Background(), "consoleApplicationID", "projectID", "org1"),
 							),
 						},
-						uniqueConstraintsFromEventConstraintWithInstanceID("INSTANCE", instance.NewAddInstanceDomainUniqueConstraint("domain.ch")),
+						uniqueConstraintsFromEventConstraint(instance.NewAddInstanceDomainUniqueConstraint("domain.ch")),
 					),
 				),
 				externalSecure: true,
@@ -348,7 +348,7 @@ func TestCommandSide_RemoveInstanceDomain(t *testing.T) {
 									"domain.ch",
 								)),
 						},
-						uniqueConstraintsFromEventConstraintWithInstanceID("INSTANCE", instance.NewRemoveInstanceDomainUniqueConstraint("domain.ch")),
+						uniqueConstraintsFromEventConstraint(instance.NewRemoveInstanceDomainUniqueConstraint("domain.ch")),
 					),
 				),
 			},
diff --git a/internal/eventstore/eventstore.go b/internal/eventstore/eventstore.go
index 8e58d9a89f..0641b349ac 100644
--- a/internal/eventstore/eventstore.go
+++ b/internal/eventstore/eventstore.go
@@ -104,10 +104,14 @@ func commandsToRepository(instanceID string, cmds []Command) (events []*reposito
 func uniqueConstraintsToRepository(instanceID string, constraints []*EventUniqueConstraint) (uniqueConstraints []*repository.UniqueConstraint) {
 	uniqueConstraints = make([]*repository.UniqueConstraint, len(constraints))
 	for i, constraint := range constraints {
+		var id string
+		if !constraint.IsGlobal {
+			id = instanceID
+		}
 		uniqueConstraints[i] = &repository.UniqueConstraint{
 			UniqueType:   constraint.UniqueType,
 			UniqueField:  constraint.UniqueField,
-			InstanceID:   instanceID,
+			InstanceID:   id,
 			Action:       uniqueConstraintActionToRepository(constraint.Action),
 			ErrorMessage: constraint.ErrorMessage,
 		}
diff --git a/internal/eventstore/unique_constraint.go b/internal/eventstore/unique_constraint.go
index d7593923db..36a9f3a1ad 100644
--- a/internal/eventstore/unique_constraint.go
+++ b/internal/eventstore/unique_constraint.go
@@ -9,6 +9,8 @@ type EventUniqueConstraint struct {
 	Action UniqueConstraintAction
 	//ErrorMessage defines the translation file key for the error message
 	ErrorMessage string
+	//IsGlobal defines if the unique constraint is globally unique or just within a single instance
+	IsGlobal bool
 }
 
 type UniqueConstraintAction int32
@@ -39,3 +41,27 @@ func NewRemoveEventUniqueConstraint(
 		Action:      UniqueConstraintRemove,
 	}
 }
+
+func NewAddGlobalEventUniqueConstraint(
+	uniqueType,
+	uniqueField,
+	errMessage string) *EventUniqueConstraint {
+	return &EventUniqueConstraint{
+		UniqueType:   uniqueType,
+		UniqueField:  uniqueField,
+		ErrorMessage: errMessage,
+		IsGlobal:     true,
+		Action:       UniqueConstraintAdd,
+	}
+}
+
+func NewRemoveGlobalEventUniqueConstraint(
+	uniqueType,
+	uniqueField string) *EventUniqueConstraint {
+	return &EventUniqueConstraint{
+		UniqueType:  uniqueType,
+		UniqueField: uniqueField,
+		IsGlobal:    true,
+		Action:      UniqueConstraintRemove,
+	}
+}
diff --git a/internal/migration/command.go b/internal/migration/command.go
index 81c0b3b4b0..16ac4eb188 100644
--- a/internal/migration/command.go
+++ b/internal/migration/command.go
@@ -73,15 +73,15 @@ func (s *SetupStep) UniqueConstraints() []*eventstore.EventUniqueConstraint {
 	switch s.Type() {
 	case startedType:
 		return []*eventstore.EventUniqueConstraint{
-			eventstore.NewAddEventUniqueConstraint("migration_started", s.migration.String(), "Errors.Step.Started.AlreadyExists"),
+			eventstore.NewAddGlobalEventUniqueConstraint("migration_started", s.migration.String(), "Errors.Step.Started.AlreadyExists"),
 		}
 	case failedType:
 		return []*eventstore.EventUniqueConstraint{
-			eventstore.NewRemoveEventUniqueConstraint("migration_started", s.migration.String()),
+			eventstore.NewRemoveGlobalEventUniqueConstraint("migration_started", s.migration.String()),
 		}
 	default:
 		return []*eventstore.EventUniqueConstraint{
-			eventstore.NewAddEventUniqueConstraint("migration_done", s.migration.String(), "Errors.Step.Done.AlreadyExists"),
+			eventstore.NewAddGlobalEventUniqueConstraint("migration_done", s.migration.String(), "Errors.Step.Done.AlreadyExists"),
 		}
 	}
 }
diff --git a/internal/repository/instance/domain.go b/internal/repository/instance/domain.go
index 0e227abfd0..807ed5b925 100644
--- a/internal/repository/instance/domain.go
+++ b/internal/repository/instance/domain.go
@@ -19,14 +19,14 @@ const (
 )
 
 func NewAddInstanceDomainUniqueConstraint(orgDomain string) *eventstore.EventUniqueConstraint {
-	return eventstore.NewAddEventUniqueConstraint(
+	return eventstore.NewAddGlobalEventUniqueConstraint(
 		UniqueInstanceDomain,
 		orgDomain,
 		"Errors.Instance.Domain.AlreadyExists")
 }
 
 func NewRemoveInstanceDomainUniqueConstraint(orgDomain string) *eventstore.EventUniqueConstraint {
-	return eventstore.NewRemoveEventUniqueConstraint(
+	return eventstore.NewRemoveGlobalEventUniqueConstraint(
 		UniqueInstanceDomain,
 		orgDomain)
 }
diff --git a/internal/repository/instance/eventstore.go b/internal/repository/instance/eventstore.go
index d816bb46d1..8b318964d8 100644
--- a/internal/repository/instance/eventstore.go
+++ b/internal/repository/instance/eventstore.go
@@ -15,7 +15,6 @@ func RegisterEventMappers(es *eventstore.Eventstore) {
 		RegisterFilterEventMapper(SMTPConfigAddedEventType, SMTPConfigAddedEventMapper).
 		RegisterFilterEventMapper(SMTPConfigChangedEventType, SMTPConfigChangedEventMapper).
 		RegisterFilterEventMapper(SMTPConfigPasswordChangedEventType, SMTPConfigPasswordChangedEventMapper).
-		RegisterFilterEventMapper(UniqueConstraintsMigratedEventType, MigrateUniqueConstraintEventMapper).
 		RegisterFilterEventMapper(SMSConfigTwilioAddedEventType, SMSConfigTwilioAddedEventMapper).
 		RegisterFilterEventMapper(SMSConfigTwilioChangedEventType, SMSConfigTwilioChangedEventMapper).
 		RegisterFilterEventMapper(SMSConfigTwilioTokenChangedEventType, SMSConfigTwilioTokenChangedEventMapper).
diff --git a/internal/repository/instance/migrate_unique_constraints.go b/internal/repository/instance/migrate_unique_constraints.go
deleted file mode 100644
index 93a58b1edf..0000000000
--- a/internal/repository/instance/migrate_unique_constraints.go
+++ /dev/null
@@ -1,59 +0,0 @@
-package instance
-
-import (
-	"context"
-
-	"github.com/zitadel/zitadel/internal/domain"
-	"github.com/zitadel/zitadel/internal/eventstore"
-
-	"github.com/zitadel/zitadel/internal/eventstore/repository"
-)
-
-const (
-	UniqueConstraintsMigratedEventType eventstore.EventType = "iam.unique.constraints.migrated"
-)
-
-type MigrateUniqueConstraintEvent struct {
-	eventstore.BaseEvent `json:"-"`
-
-	uniqueConstraintMigrations []*domain.UniqueConstraintMigration `json:"-"`
-}
-
-func NewAddMigrateUniqueConstraint(uniqueMigration *domain.UniqueConstraintMigration) *eventstore.EventUniqueConstraint {
-	return eventstore.NewAddEventUniqueConstraint(
-		uniqueMigration.UniqueType,
-		uniqueMigration.UniqueField,
-		uniqueMigration.ErrorMessage)
-}
-
-func (e *MigrateUniqueConstraintEvent) Data() interface{} {
-	return nil
-}
-
-func (e *MigrateUniqueConstraintEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	constraints := make([]*eventstore.EventUniqueConstraint, len(e.uniqueConstraintMigrations))
-	for i, uniqueMigration := range e.uniqueConstraintMigrations {
-		constraints[i] = NewAddMigrateUniqueConstraint(uniqueMigration)
-	}
-	return constraints
-}
-
-func NewMigrateUniqueConstraintEvent(
-	ctx context.Context,
-	aggregate *eventstore.Aggregate,
-	uniqueConstraintMigrations []*domain.UniqueConstraintMigration) *MigrateUniqueConstraintEvent {
-	return &MigrateUniqueConstraintEvent{
-		BaseEvent: *eventstore.NewBaseEventForPush(
-			ctx,
-			aggregate,
-			UniqueConstraintsMigratedEventType,
-		),
-		uniqueConstraintMigrations: uniqueConstraintMigrations,
-	}
-}
-
-func MigrateUniqueConstraintEventMapper(event *repository.Event) (eventstore.Event, error) {
-	return &MigrateUniqueConstraintEvent{
-		BaseEvent: *eventstore.BaseEventFromRepo(event),
-	}, nil
-}