diff --git a/cmd/zitadel/setup.yaml b/cmd/zitadel/setup.yaml
index 8d143838e4..ea627a4ddc 100644
--- a/cmd/zitadel/setup.yaml
+++ b/cmd/zitadel/setup.yaml
@@ -179,3 +179,5 @@ SetUp:
         Greeting: Hello {{.FirstName}} {{.LastName}},
         Text: The domain {{.Domain}} has been claimed by an organisation. Your current user {{.Username}} is not part of this organisation. Therefore you'll have to change your email when you login. We have created a temporary username ({{.TempUsername}}) for this login.
         ButtonText: Login
+  Step11:
+    MigrateV1EventstoreToV2: true
diff --git a/internal/setup/config.go b/internal/setup/config.go
index e5ce1e4487..b2f8d25374 100644
--- a/internal/setup/config.go
+++ b/internal/setup/config.go
@@ -6,16 +6,17 @@ import (
 )
 
 type IAMSetUp struct {
-	Step1 *command.Step1
-	Step2 *command.Step2
-	Step3 *command.Step3
-	Step4 *command.Step4
-	Step5 *command.Step5
-	Step6 *command.Step6
-	Step7 *command.Step7
-	Step8 *command.Step8
-	Step9 *command.Step9
+	Step1  *command.Step1
+	Step2  *command.Step2
+	Step3  *command.Step3
+	Step4  *command.Step4
+	Step5  *command.Step5
+	Step6  *command.Step6
+	Step7  *command.Step7
+	Step8  *command.Step8
+	Step9  *command.Step9
 	Step10 *command.Step10
+	Step11 *command.Step11
 }
 
 func (setup *IAMSetUp) Steps(currentDone domain.Step) ([]command.Step, error) {
@@ -32,6 +33,7 @@ func (setup *IAMSetUp) Steps(currentDone domain.Step) ([]command.Step, error) {
 		setup.Step8,
 		setup.Step9,
 		setup.Step10,
+		setup.Step11,
 	} {
 		if step.Step() <= currentDone {
 			continue
diff --git a/internal/static/i18n/de.yaml b/internal/static/i18n/de.yaml
index 26238d216d..3e6472808c 100644
--- a/internal/static/i18n/de.yaml
+++ b/internal/static/i18n/de.yaml
@@ -290,6 +290,8 @@ Errors:
     NotInactive: Benutzer Berechtigung ist nicht deaktiviert
     NoPermissionForProject: Benutzer hat keine Rechte auf diesem Projekt
     RoleKeyNotFound: Rolle konnte nicht gefunden werden
+  Member:
+    AlreadyExists: Member existiert bereits
   IDPConfig:
     AlreadyExists: IDP Konfiguration mit diesem Name existiert bereits
   Changes:
diff --git a/internal/static/i18n/en.yaml b/internal/static/i18n/en.yaml
index 5afca93faf..8c2a785e77 100644
--- a/internal/static/i18n/en.yaml
+++ b/internal/static/i18n/en.yaml
@@ -286,6 +286,8 @@ Errors:
     NotInactive: User grant is not deactivated
     NoPermissionForProject: User has no permissions on this project
     RoleKeyNotFound: Role not found
+  Member:
+    AlreadyExists: Member already exists
   IDPConfig:
     AlreadyExists: IDP Configuration with this name already exists
   Changes:
diff --git a/internal/v2/command/iam_idp_config.go b/internal/v2/command/iam_idp_config.go
index 404ed3f072..d172d0e8c6 100644
--- a/internal/v2/command/iam_idp_config.go
+++ b/internal/v2/command/iam_idp_config.go
@@ -66,7 +66,7 @@ func (r *CommandSide) ChangeDefaultIDPConfig(ctx context.Context, config *domain
 		return nil, caos_errs.ThrowNotFound(nil, "IAM-4M9so", "Errors.IAM.IDPConfig.NotExisting")
 	}
 
-	changedEvent, hasChanged := existingIDP.NewChangedEvent(ctx, config.IDPConfigID, config.Name, config.StylingType)
+	changedEvent, hasChanged := existingIDP.NewChangedEvent(ctx, existingIDP.ResourceOwner, config.IDPConfigID, config.Name, config.StylingType)
 	if !hasChanged {
 		return nil, caos_errs.ThrowPreconditionFailed(nil, "IAM-4M9vs", "Errors.IAM.LabelPolicy.NotChanged")
 	}
diff --git a/internal/v2/command/iam_idp_config_model.go b/internal/v2/command/iam_idp_config_model.go
index 34b3d9ab3e..c1f3c19ba7 100644
--- a/internal/v2/command/iam_idp_config_model.go
+++ b/internal/v2/command/iam_idp_config_model.go
@@ -84,13 +84,16 @@ func (wm *IAMIDPConfigWriteModel) AppendAndReduce(events ...eventstore.EventRead
 
 func (wm *IAMIDPConfigWriteModel) NewChangedEvent(
 	ctx context.Context,
+	resourceOwner,
 	configID,
 	name string,
 	stylingType domain.IDPConfigStylingType,
 ) (*iam.IDPConfigChangedEvent, bool) {
 
 	changes := make([]idpconfig.IDPConfigChanges, 0)
+	oldName := ""
 	if wm.Name != name {
+		oldName = wm.Name
 		changes = append(changes, idpconfig.ChangeName(name))
 	}
 	if stylingType.Valid() && wm.StylingType != stylingType {
@@ -99,7 +102,7 @@ func (wm *IAMIDPConfigWriteModel) NewChangedEvent(
 	if len(changes) == 0 {
 		return nil, false
 	}
-	changeEvent, err := iam.NewIDPConfigChangedEvent(ctx, configID, changes)
+	changeEvent, err := iam.NewIDPConfigChangedEvent(ctx, resourceOwner, configID, oldName, changes)
 	if err != nil {
 		return nil, false
 	}
diff --git a/internal/v2/command/iam_member.go b/internal/v2/command/iam_member.go
index da078f7787..fd3f330700 100644
--- a/internal/v2/command/iam_member.go
+++ b/internal/v2/command/iam_member.go
@@ -42,7 +42,7 @@ func (r *CommandSide) addIAMMember(ctx context.Context, iamAgg *iam_repo.Aggrega
 		return errors.ThrowAlreadyExists(nil, "IAM-sdgQ4", "Errors.IAM.Member.AlreadyExists")
 	}
 
-	iamAgg.PushEvents(iam_repo.NewMemberAddedEvent(ctx, member.UserID, member.Roles...))
+	iamAgg.PushEvents(iam_repo.NewMemberAddedEvent(ctx, iamAgg.ID(), member.UserID, member.Roles...))
 
 	return nil
 }
@@ -89,7 +89,7 @@ func (r *CommandSide) RemoveIAMMember(ctx context.Context, userID string) error
 	}
 
 	iamAgg := IAMAggregateFromWriteModel(&m.MemberWriteModel.WriteModel)
-	iamAgg.PushEvents(iam_repo.NewMemberRemovedEvent(ctx, userID))
+	iamAgg.PushEvents(iam_repo.NewMemberRemovedEvent(ctx, iamAgg.ID(), userID))
 
 	return r.eventstore.PushAggregate(ctx, m, iamAgg)
 }
diff --git a/internal/v2/command/iam_model.go b/internal/v2/command/iam_model.go
index b7dcbfc4e9..8993581220 100644
--- a/internal/v2/command/iam_model.go
+++ b/internal/v2/command/iam_model.go
@@ -27,14 +27,6 @@ func NewIAMWriteModel() *IAMWriteModel {
 
 func (wm *IAMWriteModel) AppendEvents(events ...eventstore.EventReader) {
 	wm.WriteModel.AppendEvents(events...)
-	//for _, event := range events {
-	//	switch e := event.(type) {
-	//	case *iam.LabelPolicyAddedEvent:
-	//		wm.LabelPolicyWriteModel.AppendEvents(&e.LabelPolicyAddedEvent)
-	//	case *iam.LabelPolicyChangedEvent:
-	//		wm.LabelPolicyWriteModel.AppendEvents(&e.LabelPolicyChangedEvent)
-	//	}
-	//}
 }
 
 func (wm *IAMWriteModel) Reduce() error {
@@ -61,17 +53,6 @@ func (wm *IAMWriteModel) Query() *eventstore.SearchQueryBuilder {
 		ResourceOwner(wm.ResourceOwner)
 }
 
-//
-//func (wm *IAMLabelPolicyWriteModel) HasChanged(primaryColor, secondaryColor string) bool {
-//	if primaryColor != "" && wm.PrimaryColor != primaryColor {
-//		return true
-//	}
-//	if secondaryColor != "" && wm.SecondaryColor != secondaryColor {
-//		return true
-//	}
-//	return false
-//}
-
 func IAMAggregateFromWriteModel(wm *eventstore.WriteModel) *iam.Aggregate {
 	return &iam.Aggregate{
 		Aggregate: *eventstore.AggregateFromWriteModel(wm, iam.AggregateType, iam.AggregateVersion),
diff --git a/internal/v2/command/org_idp_config.go b/internal/v2/command/org_idp_config.go
index 6e19ab913f..c38d9a43af 100644
--- a/internal/v2/command/org_idp_config.go
+++ b/internal/v2/command/org_idp_config.go
@@ -67,7 +67,13 @@ func (r *CommandSide) ChangeIDPConfig(ctx context.Context, config *domain.IDPCon
 		return nil, caos_errs.ThrowNotFound(nil, "Org-4M9so", "Errors.Org.IDPConfig.NotExisting")
 	}
 
-	changedEvent, hasChanged := existingIDP.NewChangedEvent(ctx, config.IDPConfigID, config.Name, config.StylingType)
+	changedEvent, hasChanged := existingIDP.NewChangedEvent(
+		ctx,
+		existingIDP.ResourceOwner,
+		config.IDPConfigID,
+		config.Name,
+		config.StylingType)
+
 	if !hasChanged {
 		return nil, caos_errs.ThrowPreconditionFailed(nil, "Org-4M9vs", "Errors.Org.LabelPolicy.NotChanged")
 	}
diff --git a/internal/v2/command/org_idp_config_model.go b/internal/v2/command/org_idp_config_model.go
index 19770d262d..6004d4850c 100644
--- a/internal/v2/command/org_idp_config_model.go
+++ b/internal/v2/command/org_idp_config_model.go
@@ -84,13 +84,16 @@ func (wm *OrgIDPConfigWriteModel) AppendAndReduce(events ...eventstore.EventRead
 
 func (wm *OrgIDPConfigWriteModel) NewChangedEvent(
 	ctx context.Context,
+	resourceOwner,
 	configID,
 	name string,
 	stylingType domain.IDPConfigStylingType,
 ) (*org.IDPConfigChangedEvent, bool) {
 
 	changes := make([]idpconfig.IDPConfigChanges, 0)
+	oldName := ""
 	if wm.Name != name {
+		oldName = wm.Name
 		changes = append(changes, idpconfig.ChangeName(name))
 	}
 	if stylingType.Valid() && wm.StylingType != stylingType {
@@ -99,7 +102,7 @@ func (wm *OrgIDPConfigWriteModel) NewChangedEvent(
 	if len(changes) == 0 {
 		return nil, false
 	}
-	changeEvent, err := org.NewIDPConfigChangedEvent(ctx, configID, changes)
+	changeEvent, err := org.NewIDPConfigChangedEvent(ctx, resourceOwner, configID, oldName, changes)
 	if err != nil {
 		return nil, false
 	}
diff --git a/internal/v2/command/org_member.go b/internal/v2/command/org_member.go
index f377d7a7e4..f7e2ea49ca 100644
--- a/internal/v2/command/org_member.go
+++ b/internal/v2/command/org_member.go
@@ -42,7 +42,7 @@ func (r *CommandSide) addOrgMember(ctx context.Context, orgAgg *org.Aggregate, a
 		return errors.ThrowAlreadyExists(nil, "Org-PtXi1", "Errors.Org.Member.AlreadyExists")
 	}
 
-	orgAgg.PushEvents(org.NewMemberAddedEvent(ctx, member.UserID, member.Roles...))
+	orgAgg.PushEvents(org.NewMemberAddedEvent(ctx, orgAgg.ID(), member.UserID, member.Roles...))
 
 	return nil
 }
@@ -89,7 +89,7 @@ func (r *CommandSide) RemoveOrgMember(ctx context.Context, orgID, userID string)
 	}
 
 	orgAgg := OrgAggregateFromWriteModel(&m.MemberWriteModel.WriteModel)
-	orgAgg.PushEvents(org.NewMemberRemovedEvent(ctx, userID))
+	orgAgg.PushEvents(org.NewMemberRemovedEvent(ctx, orgAgg.ID(), userID))
 
 	return r.eventstore.PushAggregate(ctx, m, orgAgg)
 }
diff --git a/internal/v2/command/project.go b/internal/v2/command/project.go
index 45d1668ed8..983dc7fed3 100644
--- a/internal/v2/command/project.go
+++ b/internal/v2/command/project.go
@@ -84,7 +84,7 @@ func (r *CommandSide) ChangeProject(ctx context.Context, projectChange *domain.P
 		return nil, caos_errs.ThrowNotFound(nil, "COMMAND-3M9sd", "Errors.Project.NotFound")
 	}
 
-	changedEvent, hasChanged, err := existingProject.NewChangedEvent(ctx, projectChange.Name, projectChange.ProjectRoleAssertion, projectChange.ProjectRoleCheck)
+	changedEvent, hasChanged, err := existingProject.NewChangedEvent(ctx, existingProject.ResourceOwner, projectChange.Name, projectChange.ProjectRoleAssertion, projectChange.ProjectRoleCheck)
 	if err != nil {
 		return nil, err
 	}
@@ -141,7 +141,7 @@ func (r *CommandSide) ReactivateProject(ctx context.Context, projectID string, r
 	}
 
 	projectAgg := ProjectAggregateFromWriteModel(&existingProject.WriteModel)
-	projectAgg.PushEvents(project.NewProjectDeactivatedEvent(ctx))
+	projectAgg.PushEvents(project.NewProjectReactivatedEvent(ctx))
 
 	return r.eventstore.PushAggregate(ctx, existingProject, projectAgg)
 }
diff --git a/internal/v2/command/project_grant.go b/internal/v2/command/project_grant.go
index 8d5d0d3ac7..53a8737196 100644
--- a/internal/v2/command/project_grant.go
+++ b/internal/v2/command/project_grant.go
@@ -8,7 +8,6 @@ import (
 	"github.com/caos/zitadel/internal/telemetry/tracing"
 	"github.com/caos/zitadel/internal/v2/domain"
 	"github.com/caos/zitadel/internal/v2/repository/project"
-	"github.com/caos/zitadel/internal/v2/repository/usergrant"
 	"reflect"
 )
 
@@ -123,7 +122,7 @@ func (r *CommandSide) removeRoleFromProjectGrant(ctx context.Context, projectAgg
 		)
 	} else {
 		projectAgg.PushEvents(
-			usergrant.NewUserGrantCascadeChangedEvent(ctx, existingProjectGrant.RoleKeys),
+			project.NewGrantCascadeChangedEvent(ctx, projectGrantID, existingProjectGrant.RoleKeys),
 		)
 	}
 
diff --git a/internal/v2/command/project_member.go b/internal/v2/command/project_member.go
index 346a40dd6a..24b5ed351e 100644
--- a/internal/v2/command/project_member.go
+++ b/internal/v2/command/project_member.go
@@ -46,7 +46,7 @@ func (r *CommandSide) addProjectMember(ctx context.Context, projectAgg *project.
 		return errors.ThrowAlreadyExists(nil, "PROJECT-PtXi1", "Errors.Project.Member.AlreadyExists")
 	}
 
-	projectAgg.PushEvents(project.NewProjectMemberAddedEvent(ctx, member.UserID, member.Roles...))
+	projectAgg.PushEvents(project.NewProjectMemberAddedEvent(ctx, projectAgg.ID(), member.UserID, member.Roles...))
 
 	return nil
 }
@@ -93,7 +93,7 @@ func (r *CommandSide) RemoveProjectMember(ctx context.Context, projectID, userID
 	}
 
 	projectAgg := ProjectAggregateFromWriteModel(&m.MemberWriteModel.WriteModel)
-	projectAgg.PushEvents(project.NewProjectMemberRemovedEvent(ctx, userID))
+	projectAgg.PushEvents(project.NewProjectMemberRemovedEvent(ctx, projectAgg.ID(), userID))
 
 	return r.eventstore.PushAggregate(ctx, m, projectAgg)
 }
diff --git a/internal/v2/command/project_model.go b/internal/v2/command/project_model.go
index 1106fdd829..28dd702663 100644
--- a/internal/v2/command/project_model.go
+++ b/internal/v2/command/project_model.go
@@ -72,6 +72,7 @@ func (wm *ProjectWriteModel) Query() *eventstore.SearchQueryBuilder {
 
 func (wm *ProjectWriteModel) NewChangedEvent(
 	ctx context.Context,
+	resourceOwner,
 	name string,
 	projectRoleAssertion,
 	projectRoleCheck bool,
@@ -79,7 +80,9 @@ func (wm *ProjectWriteModel) NewChangedEvent(
 	changes := make([]project.ProjectChanges, 0)
 	var err error
 
+	oldName := ""
 	if wm.Name != name {
+		oldName = wm.Name
 		changes = append(changes, project.ChangeName(name))
 	}
 	if wm.ProjectRoleAssertion != projectRoleAssertion {
@@ -91,7 +94,7 @@ func (wm *ProjectWriteModel) NewChangedEvent(
 	if len(changes) == 0 {
 		return nil, false, nil
 	}
-	changeEvent, err := project.NewProjectChangeEvent(ctx, changes)
+	changeEvent, err := project.NewProjectChangeEvent(ctx, resourceOwner, oldName, changes)
 	if err != nil {
 		return nil, false, err
 	}
diff --git a/internal/v2/command/project_role.go b/internal/v2/command/project_role.go
index 1568feea40..74b74fd317 100644
--- a/internal/v2/command/project_role.go
+++ b/internal/v2/command/project_role.go
@@ -51,7 +51,6 @@ func (r *CommandSide) addProjectRoles(ctx context.Context, projectAgg *project.A
 				projectRole.DisplayName,
 				projectRole.Group,
 				projectID,
-				resourceOwner,
 			),
 		)
 	}
@@ -107,7 +106,7 @@ func (r *CommandSide) RemoveProjectRole(ctx context.Context, projectID, key, res
 	}
 	aggregates := make([]eventstore.Aggregater, 0)
 	projectAgg := ProjectAggregateFromWriteModel(&existingRole.WriteModel)
-	projectAgg.PushEvents(project.NewRoleRemovedEvent(ctx, key, projectID, existingRole.ResourceOwner))
+	projectAgg.PushEvents(project.NewRoleRemovedEvent(ctx, key, projectID))
 	for _, projectGrantID := range cascadingProjectGrantIds {
 		_, err = r.removeRoleFromProjectGrant(ctx, projectAgg, projectID, projectGrantID, key, true)
 		if err != nil {
diff --git a/internal/v2/command/setup_step11.go b/internal/v2/command/setup_step11.go
new file mode 100644
index 0000000000..ec47cc131b
--- /dev/null
+++ b/internal/v2/command/setup_step11.go
@@ -0,0 +1,35 @@
+package command
+
+import (
+	"context"
+	"github.com/caos/logging"
+	"github.com/caos/zitadel/internal/v2/domain"
+	iam_repo "github.com/caos/zitadel/internal/v2/repository/iam"
+)
+
+type Step11 struct {
+	MigrateV1EventstoreToV2 bool
+}
+
+func (s *Step11) Step() domain.Step {
+	return domain.Step11
+}
+
+func (s *Step11) execute(ctx context.Context, commandSide *CommandSide) error {
+	return commandSide.SetupStep11(ctx, s)
+}
+
+func (r *CommandSide) SetupStep11(ctx context.Context, step *Step11) error {
+	fn := func(iam *IAMWriteModel) (*iam_repo.Aggregate, error) {
+		iamAgg := IAMAggregateFromWriteModel(&iam.WriteModel)
+		uniqueConstraints := NewUniqueConstraintReadModel(ctx, r)
+		err := r.eventstore.FilterToQueryReducer(ctx, uniqueConstraints)
+		if err != nil {
+			return nil, err
+		}
+		iamAgg.PushEvents(iam_repo.NewMigrateUniqueConstraintEvent(ctx, uniqueConstraints.UniqueConstraints))
+		logging.Log("SETUP-M9fsd").Info("migrate v1 eventstore to v2")
+		return iamAgg, nil
+	}
+	return r.setup(ctx, step, fn)
+}
diff --git a/internal/v2/command/unique_constraints_model.go b/internal/v2/command/unique_constraints_model.go
new file mode 100644
index 0000000000..c61f8f4d81
--- /dev/null
+++ b/internal/v2/command/unique_constraints_model.go
@@ -0,0 +1,255 @@
+package command
+
+import (
+	"context"
+	"github.com/caos/logging"
+	"github.com/caos/zitadel/internal/eventstore/v2"
+	"github.com/caos/zitadel/internal/v2/domain"
+	"github.com/caos/zitadel/internal/v2/repository/iam"
+	"github.com/caos/zitadel/internal/v2/repository/idpconfig"
+	"github.com/caos/zitadel/internal/v2/repository/member"
+	"github.com/caos/zitadel/internal/v2/repository/org"
+	"github.com/caos/zitadel/internal/v2/repository/policy"
+	"github.com/caos/zitadel/internal/v2/repository/project"
+	"github.com/caos/zitadel/internal/v2/repository/user"
+	"github.com/caos/zitadel/internal/v2/repository/usergrant"
+)
+
+type UniqueConstraintReadModel struct {
+	eventstore.WriteModel
+
+	UniqueConstraints []*domain.UniqueConstraintMigration
+	commandProvider   commandProvider
+	ctx               context.Context
+}
+
+type commandProvider interface {
+	getOrgIAMPolicy(ctx context.Context, orgID string) (*domain.OrgIAMPolicy, error)
+}
+
+func NewUniqueConstraintReadModel(ctx context.Context, provider commandProvider) *UniqueConstraintReadModel {
+	return &UniqueConstraintReadModel{
+		ctx:             ctx,
+		commandProvider: provider,
+	}
+}
+
+func (rm *UniqueConstraintReadModel) AppendEvents(events ...eventstore.EventReader) {
+	rm.WriteModel.AppendEvents(events...)
+}
+
+func (rm *UniqueConstraintReadModel) Reduce() error {
+	for _, event := range rm.Events {
+		switch e := event.(type) {
+		case *org.OrgAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.AggregateID(), org.NewAddOrgNameUniqueConstraint(e.Name))
+		case *org.OrgChangedEvent:
+			rm.changeUniqueConstraint(e.AggregateID(), e.AggregateID(), org.NewAddOrgNameUniqueConstraint(e.Name))
+		case *org.DomainVerificationAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.AggregateID(), org.NewAddOrgNameUniqueConstraint(e.Domain))
+		case *org.DomainRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.AggregateID(), org.UniqueOrgDomain)
+		case *iam.IDPConfigAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.ConfigID, idpconfig.NewAddIDPConfigNameUniqueConstraint(e.Name, e.ResourceOwner()))
+		case *iam.IDPConfigChangedEvent:
+			rm.changeUniqueConstraint(e.AggregateID(), e.ConfigID, idpconfig.NewAddIDPConfigNameUniqueConstraint(*e.Name, e.ResourceOwner()))
+		case *iam.IDPConfigRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.ConfigID, idpconfig.UniqueIDPConfigNameType)
+		case *org.IDPConfigAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.ConfigID, idpconfig.NewAddIDPConfigNameUniqueConstraint(e.Name, e.ResourceOwner()))
+		case *org.IDPConfigChangedEvent:
+			rm.changeUniqueConstraint(e.AggregateID(), e.ConfigID, idpconfig.NewAddIDPConfigNameUniqueConstraint(*e.Name, e.ResourceOwner()))
+		case *org.IDPConfigRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.ConfigID, idpconfig.UniqueIDPConfigNameType)
+		case *iam.MailTextAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.MailTextType+e.Language, policy.NewAddMailTextUniqueConstraint(e.AggregateID(), e.MailTextType, e.Language))
+		case *org.MailTextAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.MailTextType+e.Language, policy.NewAddMailTextUniqueConstraint(e.AggregateID(), e.MailTextType, e.Language))
+		case *org.MailTextRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.MailTextType+e.Language, policy.UniqueMailText)
+		case *project.ProjectAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.AggregateID(), project.NewAddProjectNameUniqueConstraint(e.Name, e.ResourceOwner()))
+		case *project.ProjectChangeEvent:
+			rm.changeUniqueConstraint(e.AggregateID(), e.AggregateID(), project.NewAddProjectNameUniqueConstraint(*e.Name, e.ResourceOwner()))
+		case *project.ProjectRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.AggregateID(), project.UniqueProjectnameType)
+		case *project.ApplicationAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.AppID, project.NewAddApplicationUniqueConstraint(e.Name, e.AggregateID()))
+		case *project.ApplicationChangedEvent:
+			rm.changeUniqueConstraint(e.AggregateID(), e.AppID, project.NewAddApplicationUniqueConstraint(e.Name, e.AggregateID()))
+		case *project.ApplicationRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.AppID, project.UniqueAppNameType)
+		case *project.GrantAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.GrantID, project.NewAddProjectGrantUniqueConstraint(e.GrantedOrgID, e.AggregateID()))
+		case *project.GrantRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.GrantID, project.UniqueGrantType)
+		case *project.GrantMemberAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.GrantID+e.UserID, project.NewAddProjectGrantMemberUniqueConstraint(e.AggregateID(), e.UserID, e.GrantID))
+		case *project.GrantMemberRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.GrantID+e.UserID, project.UniqueProjectGrantMemberType)
+		case *project.RoleAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.Key, project.NewAddProjectRoleUniqueConstraint(e.Key, e.AggregateID()))
+		case *project.RoleRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.Key, project.UniqueRoleType)
+		case *user.HumanAddedEvent:
+			policy, err := rm.commandProvider.getOrgIAMPolicy(rm.ctx, e.ResourceOwner())
+			if err != nil {
+				logging.Log("COMMAND-0k9Gs").WithError(err).Error("could not read policy for human added event unique constraint")
+				continue
+			}
+			rm.addUniqueConstraint(e.AggregateID(), e.AggregateID(), user.NewAddUsernameUniqueConstraint(e.UserName, e.ResourceOwner(), policy.UserLoginMustBeDomain))
+		case *user.HumanRegisteredEvent:
+			policy, err := rm.commandProvider.getOrgIAMPolicy(rm.ctx, e.ResourceOwner())
+			if err != nil {
+				logging.Log("COMMAND-m9fod").WithError(err).Error("could not read policy for human registered event unique constraint")
+				continue
+			}
+			rm.addUniqueConstraint(e.AggregateID(), e.AggregateID(), user.NewAddUsernameUniqueConstraint(e.UserName, e.ResourceOwner(), policy.UserLoginMustBeDomain))
+		case *user.MachineAddedEvent:
+			policy, err := rm.commandProvider.getOrgIAMPolicy(rm.ctx, e.ResourceOwner())
+			if err != nil {
+				logging.Log("COMMAND-2n8vs").WithError(err).Error("could not read policy for machine added event unique constraint")
+				continue
+			}
+			rm.addUniqueConstraint(e.AggregateID(), e.AggregateID(), user.NewAddUsernameUniqueConstraint(e.UserName, e.ResourceOwner(), policy.UserLoginMustBeDomain))
+		case *user.UserRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.AggregateID(), user.UniqueUsername)
+		case *user.UsernameChangedEvent:
+			policy, err := rm.commandProvider.getOrgIAMPolicy(rm.ctx, e.ResourceOwner())
+			if err != nil {
+				logging.Log("COMMAND-5n8gk").WithError(err).Error("could not read policy for username changed event unique constraint")
+				continue
+			}
+			rm.changeUniqueConstraint(e.AggregateID(), e.AggregateID(), user.NewAddUsernameUniqueConstraint(e.UserName, e.ResourceOwner(), policy.UserLoginMustBeDomain))
+		case *user.DomainClaimedEvent:
+			policy, err := rm.commandProvider.getOrgIAMPolicy(rm.ctx, e.ResourceOwner())
+			if err != nil {
+				logging.Log("COMMAND-xb8uf").WithError(err).Error("could not read policy for domain claimed event unique constraint")
+				continue
+			}
+			rm.changeUniqueConstraint(e.AggregateID(), e.AggregateID(), user.NewAddUsernameUniqueConstraint(e.UserName, e.ResourceOwner(), policy.UserLoginMustBeDomain))
+		case *user.HumanExternalIDPAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.IDPConfigID+e.ExternalUserID, user.NewAddExternalIDPUniqueConstraint(e.IDPConfigID, e.ExternalUserID))
+		case *user.HumanExternalIDPRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.IDPConfigID+e.ExternalUserID, user.UniqueExternalIDPType)
+		case *user.HumanExternalIDPCascadeRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.IDPConfigID+e.ExternalUserID, user.UniqueExternalIDPType)
+		case *usergrant.UserGrantAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.AggregateID(), usergrant.NewAddUserGrantUniqueConstraint(e.ResourceOwner(), e.UserID, e.ProjectID, e.ProjectGrantID))
+		case *usergrant.UserGrantRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.AggregateID(), usergrant.UniqueUserGrant)
+		case *usergrant.UserGrantCascadeRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.AggregateID(), usergrant.UniqueUserGrant)
+		case *iam.MemberAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.UserID, member.NewAddMemberUniqueConstraint(e.AggregateID(), e.UserID))
+		case *iam.MemberRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.UserID, member.UniqueMember)
+		case *org.MemberAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.UserID, member.NewAddMemberUniqueConstraint(e.AggregateID(), e.UserID))
+		case *org.MemberRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.UserID, member.UniqueMember)
+		case *project.MemberAddedEvent:
+			rm.addUniqueConstraint(e.AggregateID(), e.UserID, member.NewAddMemberUniqueConstraint(e.AggregateID(), e.UserID))
+		case *project.MemberRemovedEvent:
+			rm.removeUniqueConstraint(e.AggregateID(), e.UserID, member.UniqueMember)
+		}
+	}
+	return nil
+}
+
+func (rm *UniqueConstraintReadModel) Query() *eventstore.SearchQueryBuilder {
+	return eventstore.NewSearchQueryBuilder(eventstore.ColumnsEvent).
+		AggregateIDs(rm.AggregateID).
+		ResourceOwner(rm.ResourceOwner).
+		EventTypes(
+			org.OrgAddedEventType,
+			org.OrgChangedEventType,
+			org.OrgDomainVerifiedEventType,
+			org.OrgDomainRemovedEventType,
+			iam.IDPConfigAddedEventType,
+			iam.IDPConfigChangedEventType,
+			iam.IDPConfigRemovedEventType,
+			org.IDPConfigAddedEventType,
+			org.IDPConfigChangedEventType,
+			org.IDPConfigRemovedEventType,
+			iam.MailTextAddedEventType,
+			org.MailTextAddedEventType,
+			org.MailTextRemovedEventType,
+			project.ProjectAddedType,
+			project.ProjectChangedType,
+			project.ProjectRemovedType,
+			project.ApplicationAddedType,
+			project.ApplicationChangedType,
+			project.ApplicationRemovedType,
+			project.GrantAddedType,
+			project.GrantRemovedType,
+			project.GrantMemberAddedType,
+			project.GrantMemberRemovedType,
+			project.RoleAddedType,
+			project.RoleRemovedType,
+			user.HumanAddedType,
+			user.HumanRegisteredType,
+			user.MachineAddedEventType,
+			user.UserUserNameChangedType,
+			user.UserDomainClaimedType,
+			user.UserRemovedType,
+			user.HumanExternalIDPAddedType,
+			user.HumanExternalIDPRemovedType,
+			user.HumanExternalIDPCascadeRemovedType,
+			usergrant.UserGrantAddedType,
+			usergrant.UserGrantRemovedType,
+			usergrant.UserGrantCascadeRemovedType,
+			iam.MemberAddedEventType,
+			iam.MemberRemovedEventType,
+			org.MemberAddedEventType,
+			org.MemberRemovedEventType,
+			project.MemberAddedType,
+			project.MemberRemovedType,
+		)
+}
+
+func (rm *UniqueConstraintReadModel) getUniqueConstraint(aggregateID, objectID, constraintType string) *domain.UniqueConstraintMigration {
+	for _, uniqueConstraint := range rm.UniqueConstraints {
+		if uniqueConstraint.AggregateID == aggregateID && uniqueConstraint.ObjectID == objectID && uniqueConstraint.UniqueType == constraintType {
+			return uniqueConstraint
+		}
+	}
+	return nil
+}
+
+func (rm *UniqueConstraintReadModel) addUniqueConstraint(aggregateID, objectID string, constraint *eventstore.EventUniqueConstraint) {
+	migrateUniqueConstraint := &domain.UniqueConstraintMigration{
+		AggregateID:  aggregateID,
+		ObjectID:     objectID,
+		UniqueType:   constraint.UniqueType,
+		UniqueField:  constraint.UniqueField,
+		ErrorMessage: constraint.ErrorMessage,
+	}
+	rm.UniqueConstraints = append(rm.UniqueConstraints, migrateUniqueConstraint)
+}
+
+func (rm *UniqueConstraintReadModel) changeUniqueConstraint(aggregateID, objectID string, constraint *eventstore.EventUniqueConstraint) {
+	for i, uniqueConstraint := range rm.UniqueConstraints {
+		if uniqueConstraint.AggregateID == aggregateID && uniqueConstraint.ObjectID == objectID && uniqueConstraint.UniqueType == constraint.UniqueType {
+			rm.UniqueConstraints[i] = &domain.UniqueConstraintMigration{
+				AggregateID:  aggregateID,
+				ObjectID:     objectID,
+				UniqueType:   constraint.UniqueType,
+				UniqueField:  constraint.UniqueField,
+				ErrorMessage: constraint.ErrorMessage,
+			}
+			return
+		}
+	}
+}
+
+func (rm *UniqueConstraintReadModel) removeUniqueConstraint(aggregateID, objectID, constraintType string) {
+	for i, uniqueConstraint := range rm.UniqueConstraints {
+		if uniqueConstraint.AggregateID == aggregateID && uniqueConstraint.ObjectID == objectID && uniqueConstraint.UniqueType == constraintType {
+			copy(rm.UniqueConstraints[i:], rm.UniqueConstraints[i+1:])
+			rm.UniqueConstraints[len(rm.UniqueConstraints)-1] = nil
+			rm.UniqueConstraints = rm.UniqueConstraints[:len(rm.UniqueConstraints)-1]
+			return
+		}
+	}
+}
diff --git a/internal/v2/command/user.go b/internal/v2/command/user.go
index 8e7a9bda42..a4b2ca41e0 100644
--- a/internal/v2/command/user.go
+++ b/internal/v2/command/user.go
@@ -218,11 +218,16 @@ func (r *CommandSide) userDomainClaimed(ctx context.Context, userID string) (_ *
 	changedUserGrant := NewUserWriteModel(userID, existingUser.ResourceOwner)
 	userAgg := UserAggregateFromWriteModel(&changedUserGrant.WriteModel)
 
+	orgIAMPolicy, err := r.getOrgIAMPolicy(ctx, existingUser.ResourceOwner)
+	if err != nil {
+		return nil, nil, err
+	}
+
 	id, err := r.idGenerator.Next()
 	if err != nil {
 		return nil, nil, err
 	}
-	userAgg.PushEvents(user.NewDomainClaimedEvent(ctx, fmt.Sprintf("%s@temporary.%s", id, r.iamDomain)))
+	userAgg.PushEvents(user.NewDomainClaimedEvent(ctx, fmt.Sprintf("%s@temporary.%s", id, r.iamDomain), existingUser.UserName, orgIAMPolicy.UserLoginMustBeDomain))
 	return userAgg, changedUserGrant, nil
 }
 
diff --git a/internal/v2/command/user_grant.go b/internal/v2/command/user_grant.go
index 160389873d..e83108c946 100644
--- a/internal/v2/command/user_grant.go
+++ b/internal/v2/command/user_grant.go
@@ -251,11 +251,21 @@ func (r *CommandSide) removeUserGrant(ctx context.Context, grantID, resourceOwne
 	userGrantAgg := UserGrantAggregateFromWriteModel(&removeUserGrant.WriteModel)
 	if !cascade {
 		userGrantAgg.PushEvents(
-			usergrant.NewUserGrantRemovedEvent(ctx, existingUserGrant.ResourceOwner, existingUserGrant.UserID, existingUserGrant.ProjectID),
+			usergrant.NewUserGrantRemovedEvent(
+				ctx,
+				existingUserGrant.ResourceOwner,
+				existingUserGrant.UserID,
+				existingUserGrant.ProjectID,
+				existingUserGrant.ProjectGrantID),
 		)
 	} else {
 		userGrantAgg.PushEvents(
-			usergrant.NewUserGrantCascadeRemovedEvent(ctx, existingUserGrant.ResourceOwner, existingUserGrant.UserID, existingUserGrant.ProjectID),
+			usergrant.NewUserGrantCascadeRemovedEvent(
+				ctx,
+				existingUserGrant.ResourceOwner,
+				existingUserGrant.UserID,
+				existingUserGrant.ProjectID,
+				existingUserGrant.ProjectGrantID),
 		)
 	}
 
diff --git a/internal/v2/command/user_human_externalidp_model.go b/internal/v2/command/user_human_externalidp_model.go
index cde992a8d8..4551df2b3c 100644
--- a/internal/v2/command/user_human_externalidp_model.go
+++ b/internal/v2/command/user_human_externalidp_model.go
@@ -37,7 +37,7 @@ func (wm *HumanExternalIDPWriteModel) Reduce() error {
 		case *user.HumanExternalIDPAddedEvent:
 			wm.IDPConfigID = e.IDPConfigID
 			wm.DisplayName = e.DisplayName
-			wm.ExternalUserID = e.UserID
+			wm.ExternalUserID = e.ExternalUserID
 			wm.State = domain.ExternalIDPStateActive
 		case *user.HumanExternalIDPRemovedEvent:
 			wm.State = domain.ExternalIDPStateRemoved
diff --git a/internal/v2/domain/step.go b/internal/v2/domain/step.go
index 4b87ed5294..05a6d884ff 100644
--- a/internal/v2/domain/step.go
+++ b/internal/v2/domain/step.go
@@ -13,6 +13,7 @@ const (
 	Step8
 	Step9
 	Step10
+	Step11
 	//StepCount marks the the length of possible steps (StepCount-1 == last possible step)
 	StepCount
 )
diff --git a/internal/v2/domain/unique_constraint_migration.go b/internal/v2/domain/unique_constraint_migration.go
new file mode 100644
index 0000000000..f699e68ae3
--- /dev/null
+++ b/internal/v2/domain/unique_constraint_migration.go
@@ -0,0 +1,9 @@
+package domain
+
+type UniqueConstraintMigration struct {
+	AggregateID  string
+	ObjectID     string
+	UniqueType   string
+	UniqueField  string
+	ErrorMessage string
+}
diff --git a/internal/v2/repository/iam/eventstore.go b/internal/v2/repository/iam/eventstore.go
index f57efa2568..4a239fdad4 100644
--- a/internal/v2/repository/iam/eventstore.go
+++ b/internal/v2/repository/iam/eventstore.go
@@ -9,6 +9,7 @@ func RegisterEventMappers(es *eventstore.Eventstore) {
 		RegisterFilterEventMapper(SetupDoneEventType, SetupStepMapper).
 		RegisterFilterEventMapper(GlobalOrgSetEventType, GlobalOrgSetMapper).
 		RegisterFilterEventMapper(ProjectSetEventType, ProjectSetMapper).
+		RegisterFilterEventMapper(UniqueConstraintsMigratedEventType, MigrateUniqueConstraintEventMapper).
 		RegisterFilterEventMapper(LabelPolicyAddedEventType, LabelPolicyAddedEventMapper).
 		RegisterFilterEventMapper(LabelPolicyChangedEventType, LabelPolicyChangedEventMapper).
 		RegisterFilterEventMapper(LoginPolicyAddedEventType, LoginPolicyAddedEventMapper).
@@ -33,6 +34,10 @@ func RegisterEventMappers(es *eventstore.Eventstore) {
 		RegisterFilterEventMapper(LoginPolicyIDPProviderAddedEventType, IdentityProviderAddedEventMapper).
 		RegisterFilterEventMapper(LoginPolicyIDPProviderRemovedEventType, IdentityProviderRemovedEventMapper).
 		RegisterFilterEventMapper(LoginPolicyIDPProviderCascadeRemovedEventType, IdentityProviderCascadeRemovedEventMapper).
+		RegisterFilterEventMapper(LoginPolicySecondFactorAddedEventType, SecondFactorAddedEventMapper).
+		RegisterFilterEventMapper(LoginPolicySecondFactorRemovedEventType, SecondFactorRemovedEventMapper).
+		RegisterFilterEventMapper(LoginPolicyMultiFactorAddedEventType, MultiFactorAddedEventMapper).
+		RegisterFilterEventMapper(LoginPolicyMultiFactorRemovedEventType, MultiFactorRemovedEventMapper).
 		RegisterFilterEventMapper(MailTemplateAddedEventType, MailTemplateAddedEventMapper).
 		RegisterFilterEventMapper(MailTemplateChangedEventType, MailTemplateChangedEventMapper).
 		RegisterFilterEventMapper(MailTextAddedEventType, MailTextAddedEventMapper).
diff --git a/internal/v2/repository/iam/idp_config.go b/internal/v2/repository/iam/idp_config.go
index 9bf4edf08c..b01a6b8a3f 100644
--- a/internal/v2/repository/iam/idp_config.go
+++ b/internal/v2/repository/iam/idp_config.go
@@ -59,12 +59,15 @@ type IDPConfigChangedEvent struct {
 
 func NewIDPConfigChangedEvent(
 	ctx context.Context,
-	configID string,
+	resourceOwner,
+	configID,
+	oldName string,
 	changes []idpconfig.IDPConfigChanges,
 ) (*IDPConfigChangedEvent, error) {
 	changeEvent, err := idpconfig.NewIDPConfigChangedEvent(
-		eventstore.NewBaseEventForPush(ctx, IDPConfigChangedEventType),
+		eventstore.NewBaseEventForPushWithResourceOwner(ctx, IDPConfigChangedEventType, resourceOwner),
 		configID,
+		oldName,
 		changes,
 	)
 	if err != nil {
diff --git a/internal/v2/repository/iam/member.go b/internal/v2/repository/iam/member.go
index 59961bc790..412a294ea3 100644
--- a/internal/v2/repository/iam/member.go
+++ b/internal/v2/repository/iam/member.go
@@ -19,6 +19,7 @@ type MemberAddedEvent struct {
 
 func NewMemberAddedEvent(
 	ctx context.Context,
+	aggregateID,
 	userID string,
 	roles ...string,
 ) *MemberAddedEvent {
@@ -29,6 +30,7 @@ func NewMemberAddedEvent(
 				ctx,
 				MemberAddedEventType,
 			),
+			aggregateID,
 			userID,
 			roles...,
 		),
@@ -80,6 +82,7 @@ type MemberRemovedEvent struct {
 
 func NewMemberRemovedEvent(
 	ctx context.Context,
+	aggregateID,
 	userID string,
 ) *MemberRemovedEvent {
 
@@ -89,6 +92,7 @@ func NewMemberRemovedEvent(
 				ctx,
 				MemberRemovedEventType,
 			),
+			aggregateID,
 			userID,
 		),
 	}
diff --git a/internal/v2/repository/iam/migrate_unique_constraints.go b/internal/v2/repository/iam/migrate_unique_constraints.go
new file mode 100644
index 0000000000..f7ee3cd51d
--- /dev/null
+++ b/internal/v2/repository/iam/migrate_unique_constraints.go
@@ -0,0 +1,54 @@
+package iam
+
+import (
+	"context"
+	"github.com/caos/zitadel/internal/v2/domain"
+
+	"github.com/caos/zitadel/internal/eventstore/v2"
+	"github.com/caos/zitadel/internal/eventstore/v2/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, uniqueConstraintMigrations []*domain.UniqueConstraintMigration) *MigrateUniqueConstraintEvent {
+	return &MigrateUniqueConstraintEvent{
+		BaseEvent: *eventstore.NewBaseEventForPush(
+			ctx,
+			UniqueConstraintsMigratedEventType,
+		),
+		uniqueConstraintMigrations: uniqueConstraintMigrations,
+	}
+}
+
+func MigrateUniqueConstraintEventMapper(event *repository.Event) (eventstore.EventReader, error) {
+	return &MigrateUniqueConstraintEvent{
+		BaseEvent: *eventstore.BaseEventFromRepo(event),
+	}, nil
+}
diff --git a/internal/v2/repository/iam/policy_login_factors.go b/internal/v2/repository/iam/policy_login_factors.go
index 93f1336673..ca7151d3d7 100644
--- a/internal/v2/repository/iam/policy_login_factors.go
+++ b/internal/v2/repository/iam/policy_login_factors.go
@@ -31,7 +31,7 @@ func NewLoginPolicySecondFactorAddedEvent(
 	}
 }
 
-func SecondFactorAddedEventEventMapper(event *repository.Event) (eventstore.EventReader, error) {
+func SecondFactorAddedEventMapper(event *repository.Event) (eventstore.EventReader, error) {
 	e, err := policy.SecondFactorAddedEventMapper(event)
 	if err != nil {
 		return nil, err
@@ -58,7 +58,7 @@ func NewLoginPolicySecondFactorRemovedEvent(
 	}
 }
 
-func SecondFactorRemovedEventEventMapper(event *repository.Event) (eventstore.EventReader, error) {
+func SecondFactorRemovedEventMapper(event *repository.Event) (eventstore.EventReader, error) {
 	e, err := policy.SecondFactorRemovedEventMapper(event)
 	if err != nil {
 		return nil, err
@@ -84,7 +84,7 @@ func NewLoginPolicyMultiFactorAddedEvent(
 	}
 }
 
-func MultiFactorAddedEventEventMapper(event *repository.Event) (eventstore.EventReader, error) {
+func MultiFactorAddedEventMapper(event *repository.Event) (eventstore.EventReader, error) {
 	e, err := policy.MultiFactorAddedEventMapper(event)
 	if err != nil {
 		return nil, err
@@ -111,7 +111,7 @@ func NewLoginPolicyMultiFactorRemovedEvent(
 	}
 }
 
-func MultiFactorRemovedEventEventMapper(event *repository.Event) (eventstore.EventReader, error) {
+func MultiFactorRemovedEventMapper(event *repository.Event) (eventstore.EventReader, error) {
 	e, err := policy.MultiFactorRemovedEventMapper(event)
 	if err != nil {
 		return nil, err
diff --git a/internal/v2/repository/idpconfig/idp_config.go b/internal/v2/repository/idpconfig/idp_config.go
index 3b8779af3e..1a7d2acd3e 100644
--- a/internal/v2/repository/idpconfig/idp_config.go
+++ b/internal/v2/repository/idpconfig/idp_config.go
@@ -10,19 +10,19 @@ import (
 )
 
 const (
-	uniqueIDPConfigNameType = "idp_config_names"
+	UniqueIDPConfigNameType = "idp_config_names"
 )
 
 func NewAddIDPConfigNameUniqueConstraint(idpConfigName, resourceOwner string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewAddEventUniqueConstraint(
-		uniqueIDPConfigNameType,
+		UniqueIDPConfigNameType,
 		idpConfigName+resourceOwner,
 		"Errors.IDPConfig.AlreadyExists")
 }
 
 func NewRemoveIDPConfigNameUniqueConstraint(idpConfigName, resourceOwner string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewRemoveEventUniqueConstraint(
-		uniqueIDPConfigNameType,
+		UniqueIDPConfigNameType,
 		idpConfigName+resourceOwner)
 }
 
@@ -78,6 +78,7 @@ type IDPConfigChangedEvent struct {
 	ConfigID    string                       `json:"idpConfigId"`
 	Name        *string                      `json:"name,omitempty"`
 	StylingType *domain.IDPConfigStylingType `json:"stylingType,omitempty"`
+	oldName     string                       `json:"-"`
 }
 
 func (e *IDPConfigChangedEvent) Data() interface{} {
@@ -85,12 +86,19 @@ func (e *IDPConfigChangedEvent) Data() interface{} {
 }
 
 func (e *IDPConfigChangedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return nil
+	if e.oldName == "" {
+		return nil
+	}
+	return []*eventstore.EventUniqueConstraint{
+		NewRemoveIDPConfigNameUniqueConstraint(e.oldName, e.ResourceOwner()),
+		NewAddIDPConfigNameUniqueConstraint(*e.Name, e.ResourceOwner()),
+	}
 }
 
 func NewIDPConfigChangedEvent(
 	base *eventstore.BaseEvent,
-	configID string,
+	configID,
+	oldName string,
 	changes []IDPConfigChanges,
 ) (*IDPConfigChangedEvent, error) {
 	if len(changes) == 0 {
@@ -99,6 +107,7 @@ func NewIDPConfigChangedEvent(
 	changeEvent := &IDPConfigChangedEvent{
 		BaseEvent: *base,
 		ConfigID:  configID,
+		oldName:   oldName,
 	}
 	for _, change := range changes {
 		change(changeEvent)
diff --git a/internal/v2/repository/member/events.go b/internal/v2/repository/member/events.go
index 2118285dfa..177c021335 100644
--- a/internal/v2/repository/member/events.go
+++ b/internal/v2/repository/member/events.go
@@ -2,22 +2,39 @@ package member
 
 import (
 	"encoding/json"
+	"fmt"
 	"github.com/caos/zitadel/internal/errors"
 	"github.com/caos/zitadel/internal/eventstore/v2"
 	"github.com/caos/zitadel/internal/eventstore/v2/repository"
 )
 
 const (
+	UniqueMember     = "member"
 	AddedEventType   = "member.added"
 	ChangedEventType = "member.changed"
 	RemovedEventType = "member.removed"
 )
 
+func NewAddMemberUniqueConstraint(aggregateID, userID string) *eventstore.EventUniqueConstraint {
+	return eventstore.NewAddEventUniqueConstraint(
+		UniqueMember,
+		fmt.Sprintf("%s:%s", aggregateID, userID),
+		"Errors.Member.AlreadyExists")
+}
+
+func NewRemoveMemberUniqueConstraint(aggregateID, userID string) *eventstore.EventUniqueConstraint {
+	return eventstore.NewRemoveEventUniqueConstraint(
+		UniqueMember,
+		fmt.Sprintf("%s:%s", aggregateID, userID),
+	)
+}
+
 type MemberAddedEvent struct {
 	eventstore.BaseEvent `json:"-"`
 
-	Roles  []string `json:"roles"`
-	UserID string   `json:"userId"`
+	Roles       []string `json:"roles"`
+	UserID      string   `json:"userId"`
+	aggregateID string
 }
 
 func (e *MemberAddedEvent) Data() interface{} {
@@ -25,19 +42,21 @@ func (e *MemberAddedEvent) Data() interface{} {
 }
 
 func (e *MemberAddedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return nil
+	return []*eventstore.EventUniqueConstraint{NewAddMemberUniqueConstraint(e.aggregateID, e.UserID)}
 }
 
 func NewMemberAddedEvent(
 	base *eventstore.BaseEvent,
+	aggregateID,
 	userID string,
 	roles ...string,
 ) *MemberAddedEvent {
 
 	return &MemberAddedEvent{
-		BaseEvent: *base,
-		Roles:     roles,
-		UserID:    userID,
+		BaseEvent:   *base,
+		aggregateID: aggregateID,
+		Roles:       roles,
+		UserID:      userID,
 	}
 }
 
@@ -97,7 +116,8 @@ func ChangedEventMapper(event *repository.Event) (eventstore.EventReader, error)
 type MemberRemovedEvent struct {
 	eventstore.BaseEvent `json:"-"`
 
-	UserID string `json:"userId"`
+	UserID      string `json:"userId"`
+	aggregateID string
 }
 
 func (e *MemberRemovedEvent) Data() interface{} {
@@ -105,17 +125,19 @@ func (e *MemberRemovedEvent) Data() interface{} {
 }
 
 func (e *MemberRemovedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return nil
+	return []*eventstore.EventUniqueConstraint{NewRemoveMemberUniqueConstraint(e.aggregateID, e.UserID)}
 }
 
 func NewRemovedEvent(
 	base *eventstore.BaseEvent,
+	aggregateID,
 	userID string,
 ) *MemberRemovedEvent {
 
 	return &MemberRemovedEvent{
-		BaseEvent: *base,
-		UserID:    userID,
+		BaseEvent:   *base,
+		aggregateID: aggregateID,
+		UserID:      userID,
 	}
 }
 
diff --git a/internal/v2/repository/org/domain.go b/internal/v2/repository/org/domain.go
index 4c92c33eed..3640ddf485 100644
--- a/internal/v2/repository/org/domain.go
+++ b/internal/v2/repository/org/domain.go
@@ -12,7 +12,7 @@ import (
 )
 
 const (
-	uniqueOrgDomain                      = "org_domain"
+	UniqueOrgDomain                      = "org_domain"
 	domainEventPrefix                    = orgEventTypePrefix + "domain."
 	OrgDomainAddedEventType              = domainEventPrefix + "added"
 	OrgDomainVerificationAddedEventType  = domainEventPrefix + "verification.added"
@@ -24,14 +24,14 @@ const (
 
 func NewAddOrgDomainUniqueConstraint(orgDomain string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewAddEventUniqueConstraint(
-		uniqueOrgDomain,
+		UniqueOrgDomain,
 		orgDomain,
 		"Errors.Org.Domain.AlreadyExists")
 }
 
 func NewRemoveOrgDomainUniqueConstraint(orgDomain string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewRemoveEventUniqueConstraint(
-		uniqueOrgDomain,
+		UniqueOrgDomain,
 		orgDomain)
 }
 
@@ -84,7 +84,7 @@ func (e *DomainVerificationAddedEvent) Data() interface{} {
 }
 
 func (e *DomainVerificationAddedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return []*eventstore.EventUniqueConstraint{NewAddOrgDomainUniqueConstraint(e.Domain)}
+	return nil
 }
 
 func NewDomainVerificationAddedEvent(
@@ -162,7 +162,7 @@ func (e *DomainVerifiedEvent) Data() interface{} {
 }
 
 func (e *DomainVerifiedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return nil
+	return []*eventstore.EventUniqueConstraint{NewAddOrgDomainUniqueConstraint(e.Domain)}
 }
 
 func NewDomainVerifiedEvent(ctx context.Context, domain string) *DomainVerifiedEvent {
diff --git a/internal/v2/repository/org/eventstore.go b/internal/v2/repository/org/eventstore.go
index 3e0f83cadf..d02707957d 100644
--- a/internal/v2/repository/org/eventstore.go
+++ b/internal/v2/repository/org/eventstore.go
@@ -49,5 +49,12 @@ func RegisterEventMappers(es *eventstore.Eventstore) {
 		RegisterFilterEventMapper(MailTemplateRemovedEventType, MailTemplateRemovedEventMapper).
 		RegisterFilterEventMapper(MailTextAddedEventType, MailTextAddedEventMapper).
 		RegisterFilterEventMapper(MailTextChangedEventType, MailTextChangedEventMapper).
-		RegisterFilterEventMapper(MailTextRemovedEventType, MailTextRemovedEventMapper)
+		RegisterFilterEventMapper(MailTextRemovedEventType, MailTextRemovedEventMapper).
+		RegisterFilterEventMapper(IDPConfigAddedEventType, IDPConfigAddedEventMapper).
+		RegisterFilterEventMapper(IDPConfigChangedEventType, IDPConfigChangedEventMapper).
+		RegisterFilterEventMapper(IDPConfigRemovedEventType, IDPConfigRemovedEventMapper).
+		RegisterFilterEventMapper(IDPConfigDeactivatedEventType, IDPConfigDeactivatedEventMapper).
+		RegisterFilterEventMapper(IDPConfigReactivatedEventType, IDPConfigReactivatedEventMapper).
+		RegisterFilterEventMapper(IDPOIDCConfigAddedEventType, IDPOIDCConfigAddedEventMapper).
+		RegisterFilterEventMapper(IDPOIDCConfigChangedEventType, IDPOIDCConfigChangedEventMapper)
 }
diff --git a/internal/v2/repository/org/idp_config.go b/internal/v2/repository/org/idp_config.go
index 21882186ae..efd137d0bb 100644
--- a/internal/v2/repository/org/idp_config.go
+++ b/internal/v2/repository/org/idp_config.go
@@ -59,12 +59,15 @@ type IDPConfigChangedEvent struct {
 
 func NewIDPConfigChangedEvent(
 	ctx context.Context,
-	configID string,
+	resourceOwner,
+	configID,
+	oldName string,
 	changes []idpconfig.IDPConfigChanges,
 ) (*IDPConfigChangedEvent, error) {
 	changeEvent, err := idpconfig.NewIDPConfigChangedEvent(
-		eventstore.NewBaseEventForPush(ctx, IDPConfigChangedEventType),
+		eventstore.NewBaseEventForPushWithResourceOwner(ctx, IDPConfigChangedEventType, resourceOwner),
 		configID,
+		oldName,
 		changes,
 	)
 	if err != nil {
diff --git a/internal/v2/repository/org/member.go b/internal/v2/repository/org/member.go
index c808005141..dccffa83df 100644
--- a/internal/v2/repository/org/member.go
+++ b/internal/v2/repository/org/member.go
@@ -19,6 +19,7 @@ type MemberAddedEvent struct {
 
 func NewMemberAddedEvent(
 	ctx context.Context,
+	aggregateID,
 	userID string,
 	roles ...string,
 ) *MemberAddedEvent {
@@ -28,6 +29,7 @@ func NewMemberAddedEvent(
 				ctx,
 				MemberAddedEventType,
 			),
+			aggregateID,
 			userID,
 			roles...,
 		),
@@ -80,6 +82,7 @@ type MemberRemovedEvent struct {
 
 func NewMemberRemovedEvent(
 	ctx context.Context,
+	aggregateID,
 	userID string,
 ) *MemberRemovedEvent {
 
@@ -89,6 +92,7 @@ func NewMemberRemovedEvent(
 				ctx,
 				MemberRemovedEventType,
 			),
+			aggregateID,
 			userID,
 		),
 	}
diff --git a/internal/v2/repository/org/org.go b/internal/v2/repository/org/org.go
index ee6a4f18ce..6b7b8597d5 100644
--- a/internal/v2/repository/org/org.go
+++ b/internal/v2/repository/org/org.go
@@ -70,7 +70,8 @@ func OrgAddedEventMapper(event *repository.Event) (eventstore.EventReader, error
 type OrgChangedEvent struct {
 	eventstore.BaseEvent `json:"-"`
 
-	Name string `json:"name,omitempty"`
+	Name    string `json:"name,omitempty"`
+	oldName string `json:"-"`
 }
 
 func (e *OrgChangedEvent) Data() interface{} {
@@ -78,16 +79,20 @@ func (e *OrgChangedEvent) Data() interface{} {
 }
 
 func (e *OrgChangedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return nil
+	return []*eventstore.EventUniqueConstraint{
+		NewRemoveOrgDomainUniqueConstraint(e.oldName),
+		NewAddOrgNameUniqueConstraint(e.Name),
+	}
 }
 
-func NewOrgChangedEvent(ctx context.Context, name string) *OrgChangedEvent {
+func NewOrgChangedEvent(ctx context.Context, oldName, newName string) *OrgChangedEvent {
 	return &OrgChangedEvent{
 		BaseEvent: *eventstore.NewBaseEventForPush(
 			ctx,
 			OrgChangedEventType,
 		),
-		Name: name,
+		Name:    newName,
+		oldName: oldName,
 	}
 }
 
diff --git a/internal/v2/repository/policy/mail_text.go b/internal/v2/repository/policy/mail_text.go
index 3f0a17fbb2..564921c634 100644
--- a/internal/v2/repository/policy/mail_text.go
+++ b/internal/v2/repository/policy/mail_text.go
@@ -9,7 +9,7 @@ import (
 )
 
 const (
-	uniqueMailText                 = "mail_text"
+	UniqueMailText                 = "mail_text"
 	mailTextPolicyPrefix           = mailPolicyPrefix + "text."
 	MailTextPolicyAddedEventType   = mailTextPolicyPrefix + "added"
 	MailTextPolicyChangedEventType = mailTextPolicyPrefix + "changed"
@@ -18,14 +18,14 @@ const (
 
 func NewAddMailTextUniqueConstraint(aggregateID, mailTextType, langugage string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewAddEventUniqueConstraint(
-		uniqueMailText,
+		UniqueMailText,
 		fmt.Sprintf("%v:%v:%v", aggregateID, mailTextType, langugage),
 		"Errors.Org.AlreadyExists")
 }
 
 func NewRemoveMailTextUniqueConstraint(aggregateID, mailTextType, langugage string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewRemoveEventUniqueConstraint(
-		uniqueMailText,
+		UniqueMailText,
 		fmt.Sprintf("%v:%v:%v", aggregateID, mailTextType, langugage))
 }
 
diff --git a/internal/v2/repository/project/application.go b/internal/v2/repository/project/application.go
index 18b977ebd3..35ddb7662b 100644
--- a/internal/v2/repository/project/application.go
+++ b/internal/v2/repository/project/application.go
@@ -11,7 +11,7 @@ import (
 )
 
 const (
-	uniqueAppNameType          = "appname"
+	UniqueAppNameType          = "appname"
 	applicationEventTypePrefix = projectEventTypePrefix + "application."
 	ApplicationAddedType       = applicationEventTypePrefix + "added"
 	ApplicationChangedType     = applicationEventTypePrefix + "changed"
@@ -22,14 +22,14 @@ const (
 
 func NewAddApplicationUniqueConstraint(name, projectID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewAddEventUniqueConstraint(
-		uniqueAppNameType,
+		UniqueAppNameType,
 		fmt.Sprintf("%s:%s", name, projectID),
 		"Errors.Project.App.AlreadyExists")
 }
 
 func NewRemoveApplicationUniqueConstraint(name, projectID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewRemoveEventUniqueConstraint(
-		uniqueAppNameType,
+		UniqueAppNameType,
 		fmt.Sprintf("%s:%s", name, projectID))
 }
 
diff --git a/internal/v2/repository/project/eventstore.go b/internal/v2/repository/project/eventstore.go
index ee5c632365..9da51d47ec 100644
--- a/internal/v2/repository/project/eventstore.go
+++ b/internal/v2/repository/project/eventstore.go
@@ -18,7 +18,7 @@ func RegisterEventMappers(es *eventstore.Eventstore) {
 		RegisterFilterEventMapper(RoleRemovedType, RoleRemovedEventMapper).
 		RegisterFilterEventMapper(GrantAddedType, GrantAddedEventMapper).
 		RegisterFilterEventMapper(GrantChangedType, GrantChangedEventMapper).
-		RegisterFilterEventMapper(GrantCascadeChangedType, GrantChangedEventMapper).
+		RegisterFilterEventMapper(GrantCascadeChangedType, GrantCascadeChangedEventMapper).
 		RegisterFilterEventMapper(GrantDeactivatedType, GrantDeactivateEventMapper).
 		RegisterFilterEventMapper(GrantReactivatedType, GrantReactivatedEventMapper).
 		RegisterFilterEventMapper(GrantRemovedType, GrantRemovedEventMapper).
@@ -26,7 +26,7 @@ func RegisterEventMappers(es *eventstore.Eventstore) {
 		RegisterFilterEventMapper(GrantMemberChangedType, GrantMemberChangedEventMapper).
 		RegisterFilterEventMapper(GrantMemberRemovedType, GrantMemberRemovedEventMapper).
 		RegisterFilterEventMapper(ApplicationAddedType, ApplicationAddedEventMapper).
-		RegisterFilterEventMapper(ApplicationChangedType, ApplicationAddedEventMapper).
+		RegisterFilterEventMapper(ApplicationChangedType, ApplicationChangedEventMapper).
 		RegisterFilterEventMapper(ApplicationRemovedType, ApplicationRemovedEventMapper).
 		RegisterFilterEventMapper(ApplicationDeactivatedType, ApplicationDeactivatedEventMapper).
 		RegisterFilterEventMapper(ApplicationReactivatedType, ApplicationReactivatedEventMapper).
diff --git a/internal/v2/repository/project/grant.go b/internal/v2/repository/project/grant.go
index 45d3dc9021..4611bb9b8c 100644
--- a/internal/v2/repository/project/grant.go
+++ b/internal/v2/repository/project/grant.go
@@ -10,7 +10,7 @@ import (
 )
 
 var (
-	uniqueGrantType         = "project_Grant"
+	UniqueGrantType         = "project_grant"
 	grantEventTypePrefix    = projectEventTypePrefix + "grant."
 	GrantAddedType          = grantEventTypePrefix + "added"
 	GrantChangedType        = grantEventTypePrefix + "changed"
@@ -22,14 +22,14 @@ var (
 
 func NewAddProjectGrantUniqueConstraint(grantedOrgID, projectID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewAddEventUniqueConstraint(
-		uniqueRoleType,
+		UniqueRoleType,
 		fmt.Sprintf("%s:%s", grantedOrgID, projectID),
 		"Errors.Project.Grant.AlreadyExists")
 }
 
 func NewRemoveProjectGrantUniqueConstraint(grantedOrgID, projectID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewRemoveEventUniqueConstraint(
-		uniqueRoleType,
+		UniqueRoleType,
 		fmt.Sprintf("%s:%s", grantedOrgID, projectID))
 }
 
diff --git a/internal/v2/repository/project/grant_member.go b/internal/v2/repository/project/grant_member.go
index 99a65297e8..a9e56304e4 100644
--- a/internal/v2/repository/project/grant_member.go
+++ b/internal/v2/repository/project/grant_member.go
@@ -11,22 +11,22 @@ import (
 )
 
 var (
-	uniqueProjectGrantType = "project_grant"
-	GrantMemberAddedType   = grantEventTypePrefix + member.AddedEventType
-	GrantMemberChangedType = grantEventTypePrefix + member.ChangedEventType
-	GrantMemberRemovedType = grantEventTypePrefix + member.RemovedEventType
+	UniqueProjectGrantMemberType = "project_grant_member"
+	GrantMemberAddedType         = grantEventTypePrefix + member.AddedEventType
+	GrantMemberChangedType       = grantEventTypePrefix + member.ChangedEventType
+	GrantMemberRemovedType       = grantEventTypePrefix + member.RemovedEventType
 )
 
 func NewAddProjectGrantMemberUniqueConstraint(projectID, userID, grantID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewAddEventUniqueConstraint(
-		uniqueProjectGrantType,
+		UniqueProjectGrantMemberType,
 		fmt.Sprintf("%s:%s:%s", projectID, userID, grantID),
 		"Errors.Project.Member.AlreadyExists")
 }
 
 func NewRemoveProjectGrantMemberUniqueConstraint(projectID, userID, grantID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewRemoveEventUniqueConstraint(
-		uniqueProjectGrantType,
+		UniqueProjectGrantMemberType,
 		fmt.Sprintf("%s:%s:%s", projectID, userID, grantID),
 	)
 }
diff --git a/internal/v2/repository/project/member.go b/internal/v2/repository/project/member.go
index 447e8a1e91..c1b4411d49 100644
--- a/internal/v2/repository/project/member.go
+++ b/internal/v2/repository/project/member.go
@@ -19,6 +19,7 @@ type MemberAddedEvent struct {
 
 func NewProjectMemberAddedEvent(
 	ctx context.Context,
+	aggregateID,
 	userID string,
 	roles ...string,
 ) *MemberAddedEvent {
@@ -28,6 +29,7 @@ func NewProjectMemberAddedEvent(
 				ctx,
 				MemberAddedType,
 			),
+			aggregateID,
 			userID,
 			roles...,
 		),
@@ -80,6 +82,7 @@ type MemberRemovedEvent struct {
 
 func NewProjectMemberRemovedEvent(
 	ctx context.Context,
+	aggregateID,
 	userID string,
 ) *MemberRemovedEvent {
 
@@ -89,6 +92,7 @@ func NewProjectMemberRemovedEvent(
 				ctx,
 				MemberRemovedType,
 			),
+			aggregateID,
 			userID,
 		),
 	}
diff --git a/internal/v2/repository/project/project.go b/internal/v2/repository/project/project.go
index 5f20563934..838e4b0723 100644
--- a/internal/v2/repository/project/project.go
+++ b/internal/v2/repository/project/project.go
@@ -10,7 +10,7 @@ import (
 )
 
 const (
-	uniqueProjectnameType  = "project_names"
+	UniqueProjectnameType  = "project_names"
 	projectEventTypePrefix = eventstore.EventType("project.")
 	ProjectAddedType       = projectEventTypePrefix + "added"
 	ProjectChangedType     = projectEventTypePrefix + "changed"
@@ -21,14 +21,14 @@ const (
 
 func NewAddProjectNameUniqueConstraint(projectName, resourceOwner string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewAddEventUniqueConstraint(
-		uniqueProjectnameType,
+		UniqueProjectnameType,
 		projectName+resourceOwner,
 		"Errors.Project.AlreadyExists")
 }
 
 func NewRemoveProjectNameUniqueConstraint(projectName, resourceOwner string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewRemoveEventUniqueConstraint(
-		uniqueProjectnameType,
+		UniqueProjectnameType,
 		projectName+resourceOwner)
 }
 
@@ -78,6 +78,7 @@ type ProjectChangeEvent struct {
 	Name                 *string `json:"name,omitempty"`
 	ProjectRoleAssertion *bool   `json:"projectRoleAssertion,omitempty"`
 	ProjectRoleCheck     *bool   `json:"projectRoleCheck,omitempty"`
+	oldName              string
 }
 
 func (e *ProjectChangeEvent) Data() interface{} {
@@ -85,19 +86,27 @@ func (e *ProjectChangeEvent) Data() interface{} {
 }
 
 func (e *ProjectChangeEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
+	if e.oldName != "" {
+		return []*eventstore.EventUniqueConstraint{
+			NewRemoveProjectNameUniqueConstraint(e.oldName, e.ResourceOwner()),
+			NewAddProjectNameUniqueConstraint(*e.Name, e.ResourceOwner()),
+		}
+	}
 	return nil
 }
 
 func NewProjectChangeEvent(
 	ctx context.Context,
+	resourceOwner, oldName string,
 	changes []ProjectChanges) (*ProjectChangeEvent, error) {
 	if len(changes) == 0 {
 		return nil, errors.ThrowPreconditionFailed(nil, "PROJECT-mV9xc", "Errors.NoChangesFound")
 	}
 	changeEvent := &ProjectChangeEvent{
-		BaseEvent: *eventstore.NewBaseEventForPush(
+		BaseEvent: *eventstore.NewBaseEventForPushWithResourceOwner(
 			ctx,
 			ProjectChangedType,
+			resourceOwner,
 		),
 	}
 	for _, change := range changes {
diff --git a/internal/v2/repository/project/role.go b/internal/v2/repository/project/role.go
index 7f78bae90a..e68e86b8bd 100644
--- a/internal/v2/repository/project/role.go
+++ b/internal/v2/repository/project/role.go
@@ -10,24 +10,24 @@ import (
 )
 
 var (
-	uniqueRoleType      = "project_role"
+	UniqueRoleType      = "project_role"
 	roleEventTypePrefix = projectEventTypePrefix + "role."
 	RoleAddedType       = roleEventTypePrefix + "added"
 	RoleChangedType     = roleEventTypePrefix + "changed"
 	RoleRemovedType     = roleEventTypePrefix + "removed"
 )
 
-func NewAddProjectRoleUniqueConstraint(roleKey, projectID, resourceOwner string) *eventstore.EventUniqueConstraint {
+func NewAddProjectRoleUniqueConstraint(roleKey, projectID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewAddEventUniqueConstraint(
-		uniqueRoleType,
-		fmt.Sprintf("%s:%s:%s", roleKey, projectID, resourceOwner),
+		UniqueRoleType,
+		fmt.Sprintf("%s:%s", roleKey, projectID),
 		"Errors.Project.Role.AlreadyExists")
 }
 
-func NewRemoveProjectRoleUniqueConstraint(roleKey, projectID, resourceOwner string) *eventstore.EventUniqueConstraint {
+func NewRemoveProjectRoleUniqueConstraint(roleKey, projectID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewRemoveEventUniqueConstraint(
-		uniqueRoleType,
-		fmt.Sprintf("%s:%s:%s", roleKey, projectID, resourceOwner))
+		UniqueRoleType,
+		fmt.Sprintf("%s:%s", roleKey, projectID))
 }
 
 type RoleAddedEvent struct {
@@ -44,15 +44,14 @@ func (e *RoleAddedEvent) Data() interface{} {
 }
 
 func (e *RoleAddedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return []*eventstore.EventUniqueConstraint{NewAddProjectRoleUniqueConstraint(e.Key, e.projectID, e.ResourceOwner())}
+	return []*eventstore.EventUniqueConstraint{NewAddProjectRoleUniqueConstraint(e.Key, e.projectID)}
 }
 
-func NewRoleAddedEvent(ctx context.Context, key, displayName, group, projectID, resourceOwner string) *RoleAddedEvent {
+func NewRoleAddedEvent(ctx context.Context, key, displayName, group, projectID string) *RoleAddedEvent {
 	return &RoleAddedEvent{
-		BaseEvent: *eventstore.NewBaseEventForPushWithResourceOwner(
+		BaseEvent: *eventstore.NewBaseEventForPush(
 			ctx,
 			RoleAddedType,
-			resourceOwner,
 		),
 		Key:         key,
 		DisplayName: displayName,
@@ -144,7 +143,7 @@ type RoleRemovedEvent struct {
 	eventstore.BaseEvent `json:"-"`
 
 	Key       string `json:"key,omitempty"`
-	projectID string
+	projectID string `json:"-"`
 }
 
 func (e *RoleRemovedEvent) Data() interface{} {
@@ -152,15 +151,14 @@ func (e *RoleRemovedEvent) Data() interface{} {
 }
 
 func (e *RoleRemovedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return []*eventstore.EventUniqueConstraint{NewRemoveProjectRoleUniqueConstraint(e.Key, e.projectID, e.ResourceOwner())}
+	return []*eventstore.EventUniqueConstraint{NewRemoveProjectRoleUniqueConstraint(e.Key, e.projectID)}
 }
 
-func NewRoleRemovedEvent(ctx context.Context, key, projectID, resourceOwner string) *RoleRemovedEvent {
+func NewRoleRemovedEvent(ctx context.Context, key, projectID string) *RoleRemovedEvent {
 	return &RoleRemovedEvent{
-		BaseEvent: *eventstore.NewBaseEventForPushWithResourceOwner(
+		BaseEvent: *eventstore.NewBaseEventForPush(
 			ctx,
 			RoleRemovedType,
-			resourceOwner,
 		),
 		Key:       key,
 		projectID: projectID,
diff --git a/internal/v2/repository/user/eventstore.go b/internal/v2/repository/user/eventstore.go
index a3d50f3865..b0758c39eb 100644
--- a/internal/v2/repository/user/eventstore.go
+++ b/internal/v2/repository/user/eventstore.go
@@ -43,7 +43,7 @@ func RegisterEventMappers(es *eventstore.Eventstore) {
 		RegisterFilterEventMapper(UserRemovedType, UserRemovedEventMapper).
 		RegisterFilterEventMapper(UserTokenAddedType, UserTokenAddedEventMapper).
 		RegisterFilterEventMapper(UserDomainClaimedType, DomainClaimedEventMapper).
-		RegisterFilterEventMapper(UserDomainClaimedSentType, DomainClaimedEventMapper).
+		RegisterFilterEventMapper(UserDomainClaimedSentType, DomainClaimedSentEventMapper).
 		RegisterFilterEventMapper(UserUserNameChangedType, UsernameChangedEventMapper).
 		RegisterFilterEventMapper(HumanAddedType, HumanAddedEventMapper).
 		RegisterFilterEventMapper(HumanRegisteredType, HumanRegisteredEventMapper).
diff --git a/internal/v2/repository/user/human_external_idp.go b/internal/v2/repository/user/human_external_idp.go
index 8c8bf8cc54..c38b1f17bb 100644
--- a/internal/v2/repository/user/human_external_idp.go
+++ b/internal/v2/repository/user/human_external_idp.go
@@ -9,7 +9,7 @@ import (
 )
 
 const (
-	uniqueExternalIDPType    = "external_idps"
+	UniqueExternalIDPType    = "external_idps"
 	externalIDPEventPrefix   = humanEventPrefix + "externalidp."
 	externalLoginEventPrefix = humanEventPrefix + "externallogin."
 
@@ -22,23 +22,23 @@ const (
 
 func NewAddExternalIDPUniqueConstraint(idpConfigID, externalUserID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewAddEventUniqueConstraint(
-		uniqueExternalIDPType,
+		UniqueExternalIDPType,
 		idpConfigID+externalUserID,
 		"Errors.User.ExternalIDP.AlreadyExists")
 }
 
 func NewRemoveExternalIDPUniqueConstraint(idpConfigID, externalUserID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewRemoveEventUniqueConstraint(
-		uniqueExternalIDPType,
+		UniqueExternalIDPType,
 		idpConfigID+externalUserID)
 }
 
 type HumanExternalIDPAddedEvent struct {
 	eventstore.BaseEvent `json:"-"`
 
-	IDPConfigID string `json:"idpConfigId,omitempty"`
-	UserID      string `json:"userId,omitempty"`
-	DisplayName string `json:"displayName,omitempty"`
+	IDPConfigID    string `json:"idpConfigId,omitempty"`
+	ExternalUserID string `json:"userId,omitempty"`
+	DisplayName    string `json:"displayName,omitempty"`
 }
 
 func (e *HumanExternalIDPAddedEvent) Data() interface{} {
@@ -46,7 +46,7 @@ func (e *HumanExternalIDPAddedEvent) Data() interface{} {
 }
 
 func (e *HumanExternalIDPAddedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return []*eventstore.EventUniqueConstraint{NewAddExternalIDPUniqueConstraint(e.IDPConfigID, e.UserID)}
+	return []*eventstore.EventUniqueConstraint{NewAddExternalIDPUniqueConstraint(e.IDPConfigID, e.ExternalUserID)}
 }
 
 func NewHumanExternalIDPAddedEvent(ctx context.Context, idpConfigID, displayName, externalUserID string) *HumanExternalIDPAddedEvent {
@@ -55,9 +55,9 @@ func NewHumanExternalIDPAddedEvent(ctx context.Context, idpConfigID, displayName
 			ctx,
 			HumanExternalIDPAddedType,
 		),
-		IDPConfigID: idpConfigID,
-		DisplayName: displayName,
-		UserID:      externalUserID,
+		IDPConfigID:    idpConfigID,
+		DisplayName:    displayName,
+		ExternalUserID: externalUserID,
 	}
 }
 
@@ -77,8 +77,8 @@ func HumanExternalIDPAddedEventMapper(event *repository.Event) (eventstore.Event
 type HumanExternalIDPRemovedEvent struct {
 	eventstore.BaseEvent `json:"-"`
 
-	IDPConfigID string `json:"idpConfigId"`
-	UserID      string `json:"userId,omitempty"`
+	IDPConfigID    string `json:"idpConfigId"`
+	ExternalUserID string `json:"userId,omitempty"`
 }
 
 func (e *HumanExternalIDPRemovedEvent) Data() interface{} {
@@ -86,7 +86,7 @@ func (e *HumanExternalIDPRemovedEvent) Data() interface{} {
 }
 
 func (e *HumanExternalIDPRemovedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return []*eventstore.EventUniqueConstraint{NewRemoveExternalIDPUniqueConstraint(e.IDPConfigID, e.UserID)}
+	return []*eventstore.EventUniqueConstraint{NewRemoveExternalIDPUniqueConstraint(e.IDPConfigID, e.ExternalUserID)}
 }
 
 func NewHumanExternalIDPRemovedEvent(ctx context.Context, idpConfigID, externalUserID string) *HumanExternalIDPRemovedEvent {
@@ -95,8 +95,8 @@ func NewHumanExternalIDPRemovedEvent(ctx context.Context, idpConfigID, externalU
 			ctx,
 			HumanExternalIDPRemovedType,
 		),
-		IDPConfigID: idpConfigID,
-		UserID:      externalUserID,
+		IDPConfigID:    idpConfigID,
+		ExternalUserID: externalUserID,
 	}
 }
 
@@ -116,8 +116,8 @@ func HumanExternalIDPRemovedEventMapper(event *repository.Event) (eventstore.Eve
 type HumanExternalIDPCascadeRemovedEvent struct {
 	eventstore.BaseEvent `json:"-"`
 
-	IDPConfigID string `json:"idpConfigId"`
-	UserID      string `json:"userId,omitempty"`
+	IDPConfigID    string `json:"idpConfigId"`
+	ExternalUserID string `json:"userId,omitempty"`
 }
 
 func (e *HumanExternalIDPCascadeRemovedEvent) Data() interface{} {
@@ -125,7 +125,7 @@ func (e *HumanExternalIDPCascadeRemovedEvent) Data() interface{} {
 }
 
 func (e *HumanExternalIDPCascadeRemovedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return []*eventstore.EventUniqueConstraint{NewRemoveExternalIDPUniqueConstraint(e.IDPConfigID, e.UserID)}
+	return []*eventstore.EventUniqueConstraint{NewRemoveExternalIDPUniqueConstraint(e.IDPConfigID, e.ExternalUserID)}
 }
 
 func NewHumanExternalIDPCascadeRemovedEvent(ctx context.Context, idpConfigID, externalUserID string) *HumanExternalIDPCascadeRemovedEvent {
@@ -134,8 +134,8 @@ func NewHumanExternalIDPCascadeRemovedEvent(ctx context.Context, idpConfigID, ex
 			ctx,
 			HumanExternalIDPCascadeRemovedType,
 		),
-		IDPConfigID: idpConfigID,
-		UserID:      externalUserID,
+		IDPConfigID:    idpConfigID,
+		ExternalUserID: externalUserID,
 	}
 }
 
diff --git a/internal/v2/repository/user/user.go b/internal/v2/repository/user/user.go
index b02dad50ad..367964536a 100644
--- a/internal/v2/repository/user/user.go
+++ b/internal/v2/repository/user/user.go
@@ -10,7 +10,7 @@ import (
 )
 
 const (
-	uniqueUsername            = "usernames"
+	UniqueUsername            = "usernames"
 	userEventTypePrefix       = eventstore.EventType("user.")
 	UserLockedType            = userEventTypePrefix + "locked"
 	UserUnlockedType          = userEventTypePrefix + "unlocked"
@@ -29,7 +29,7 @@ func NewAddUsernameUniqueConstraint(userName, resourceOwner string, userLoginMus
 		uniqueUserName = userName + resourceOwner
 	}
 	return eventstore.NewAddEventUniqueConstraint(
-		uniqueUsername,
+		UniqueUsername,
 		uniqueUserName,
 		"Errors.User.AlreadyExists")
 }
@@ -40,7 +40,7 @@ func NewRemoveUsernameUniqueConstraint(userName, resourceOwner string, userLogin
 		uniqueUserName = userName + resourceOwner
 	}
 	return eventstore.NewRemoveEventUniqueConstraint(
-		uniqueUsername,
+		UniqueUsername,
 		uniqueUserName)
 }
 
@@ -245,7 +245,9 @@ func UserTokenAddedEventMapper(event *repository.Event) (eventstore.EventReader,
 type DomainClaimedEvent struct {
 	eventstore.BaseEvent `json:"-"`
 
-	UserName string `json:"userName"`
+	UserName              string `json:"userName"`
+	oldUserName           string `json:"-"`
+	userLoginMustBeDomain bool   `json:"-"`
 }
 
 func (e *DomainClaimedEvent) Data() interface{} {
@@ -253,19 +255,26 @@ func (e *DomainClaimedEvent) Data() interface{} {
 }
 
 func (e *DomainClaimedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return nil
+	return []*eventstore.EventUniqueConstraint{
+		NewRemoveUsernameUniqueConstraint(e.oldUserName, e.ResourceOwner(), e.userLoginMustBeDomain),
+		NewAddUsernameUniqueConstraint(e.UserName, e.ResourceOwner(), e.userLoginMustBeDomain),
+	}
 }
 
 func NewDomainClaimedEvent(
 	ctx context.Context,
-	userName string,
+	userName,
+	oldUserName string,
+	userLoginMustBeDomain bool,
 ) *DomainClaimedEvent {
 	return &DomainClaimedEvent{
 		BaseEvent: *eventstore.NewBaseEventForPush(
 			ctx,
 			UserDomainClaimedType,
 		),
-		UserName: userName,
+		UserName:              userName,
+		oldUserName:           oldUserName,
+		userLoginMustBeDomain: userLoginMustBeDomain,
 	}
 }
 
@@ -314,8 +323,8 @@ type UsernameChangedEvent struct {
 	eventstore.BaseEvent `json:"-"`
 
 	UserName              string `json:"userName"`
-	OldUserName           string
-	UserLoginMustBeDomain bool
+	oldUserName           string `json:"-"`
+	userLoginMustBeDomain bool   `json:"-"`
 }
 
 func (e *UsernameChangedEvent) Data() interface{} {
@@ -324,8 +333,8 @@ func (e *UsernameChangedEvent) Data() interface{} {
 
 func (e *UsernameChangedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
 	return []*eventstore.EventUniqueConstraint{
-		NewRemoveUsernameUniqueConstraint(e.OldUserName, e.ResourceOwner(), e.UserLoginMustBeDomain),
-		NewAddUsernameUniqueConstraint(e.UserName, e.ResourceOwner(), e.UserLoginMustBeDomain),
+		NewRemoveUsernameUniqueConstraint(e.oldUserName, e.ResourceOwner(), e.userLoginMustBeDomain),
+		NewAddUsernameUniqueConstraint(e.UserName, e.ResourceOwner(), e.userLoginMustBeDomain),
 	}
 }
 
@@ -341,8 +350,8 @@ func NewUsernameChangedEvent(
 			UserUserNameChangedType,
 		),
 		UserName:              newUserName,
-		OldUserName:           oldUserName,
-		UserLoginMustBeDomain: userLoginMustBeDomain,
+		oldUserName:           oldUserName,
+		userLoginMustBeDomain: userLoginMustBeDomain,
 	}
 }
 
diff --git a/internal/v2/repository/usergrant/user_grant.go b/internal/v2/repository/usergrant/user_grant.go
index 0ca5a40f64..f216a934ef 100644
--- a/internal/v2/repository/usergrant/user_grant.go
+++ b/internal/v2/repository/usergrant/user_grant.go
@@ -10,7 +10,7 @@ import (
 )
 
 const (
-	uniqueUserGrant             = "user_grant"
+	UniqueUserGrant             = "user_grant"
 	userGrantEventTypePrefix    = eventstore.EventType("user.grant.")
 	UserGrantAddedType          = userGrantEventTypePrefix + "added"
 	UserGrantChangedType        = userGrantEventTypePrefix + "changed"
@@ -21,17 +21,17 @@ const (
 	UserGrantReactivatedType    = userGrantEventTypePrefix + "reactivated"
 )
 
-func NewAddUserGrantUniqueConstraint(resourceOwner, userID, projectID string) *eventstore.EventUniqueConstraint {
+func NewAddUserGrantUniqueConstraint(resourceOwner, userID, projectID, projectGrantID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewAddEventUniqueConstraint(
-		uniqueUserGrant,
-		fmt.Sprintf("%s:%s:%s", resourceOwner, userID, projectID),
+		UniqueUserGrant,
+		fmt.Sprintf("%s:%s:%s:%v", resourceOwner, userID, projectID, projectGrantID),
 		"Errors.UserGrant.AlreadyExists")
 }
 
-func NewRemoveUserGrantUniqueConstraint(resourceOwner, userID, projectID string) *eventstore.EventUniqueConstraint {
+func NewRemoveUserGrantUniqueConstraint(resourceOwner, userID, projectID, projectGrantID string) *eventstore.EventUniqueConstraint {
 	return eventstore.NewRemoveEventUniqueConstraint(
-		uniqueUserGrant,
-		fmt.Sprintf("%s:%s:%s", resourceOwner, userID, projectID))
+		UniqueUserGrant,
+		fmt.Sprintf("%s:%s:%s:%S", resourceOwner, userID, projectID, projectGrantID))
 }
 
 type UserGrantAddedEvent struct {
@@ -48,7 +48,7 @@ func (e *UserGrantAddedEvent) Data() interface{} {
 }
 
 func (e *UserGrantAddedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return []*eventstore.EventUniqueConstraint{NewAddUserGrantUniqueConstraint(e.ResourceOwner(), e.UserID, e.ProjectID)}
+	return []*eventstore.EventUniqueConstraint{NewAddUserGrantUniqueConstraint(e.ResourceOwner(), e.UserID, e.ProjectID, e.ProjectGrantID)}
 }
 
 func NewUserGrantAddedEvent(
@@ -162,8 +162,9 @@ func UserGrantCascadeChangedEventMapper(event *repository.Event) (eventstore.Eve
 
 type UserGrantRemovedEvent struct {
 	eventstore.BaseEvent `json:"-"`
-	userID               string
-	projectID            string
+	userID               string `json:"-"`
+	projectID            string `json:"-"`
+	projectGrantID       string `json:"-"`
 }
 
 func (e *UserGrantRemovedEvent) Data() interface{} {
@@ -171,18 +172,19 @@ func (e *UserGrantRemovedEvent) Data() interface{} {
 }
 
 func (e *UserGrantRemovedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return []*eventstore.EventUniqueConstraint{NewRemoveUserGrantUniqueConstraint(e.ResourceOwner(), e.userID, e.projectID)}
+	return []*eventstore.EventUniqueConstraint{NewRemoveUserGrantUniqueConstraint(e.ResourceOwner(), e.userID, e.projectID, e.projectGrantID)}
 }
 
-func NewUserGrantRemovedEvent(ctx context.Context, resourceOwner, userID, projectID string) *UserGrantRemovedEvent {
+func NewUserGrantRemovedEvent(ctx context.Context, resourceOwner, userID, projectID, projectGrantID string) *UserGrantRemovedEvent {
 	return &UserGrantRemovedEvent{
 		BaseEvent: *eventstore.NewBaseEventForPushWithResourceOwner(
 			ctx,
 			UserGrantRemovedType,
 			resourceOwner,
 		),
-		userID:    userID,
-		projectID: projectID,
+		userID:         userID,
+		projectID:      projectID,
+		projectGrantID: projectGrantID,
 	}
 }
 
@@ -194,8 +196,9 @@ func UserGrantRemovedEventMapper(event *repository.Event) (eventstore.EventReade
 
 type UserGrantCascadeRemovedEvent struct {
 	eventstore.BaseEvent `json:"-"`
-	userID               string
-	projectID            string
+	userID               string `json:"-"`
+	projectID            string `json:"-"`
+	projectGrantID       string `json:"-"`
 }
 
 func (e *UserGrantCascadeRemovedEvent) Data() interface{} {
@@ -203,18 +206,19 @@ func (e *UserGrantCascadeRemovedEvent) Data() interface{} {
 }
 
 func (e *UserGrantCascadeRemovedEvent) UniqueConstraints() []*eventstore.EventUniqueConstraint {
-	return []*eventstore.EventUniqueConstraint{NewRemoveUserGrantUniqueConstraint(e.ResourceOwner(), e.userID, e.projectID)}
+	return []*eventstore.EventUniqueConstraint{NewRemoveUserGrantUniqueConstraint(e.ResourceOwner(), e.userID, e.projectID, e.projectGrantID)}
 }
 
-func NewUserGrantCascadeRemovedEvent(ctx context.Context, resourceOwner, userID, projectID string) *UserGrantCascadeRemovedEvent {
+func NewUserGrantCascadeRemovedEvent(ctx context.Context, resourceOwner, userID, projectID, projectGrantID string) *UserGrantCascadeRemovedEvent {
 	return &UserGrantCascadeRemovedEvent{
 		BaseEvent: *eventstore.NewBaseEventForPushWithResourceOwner(
 			ctx,
 			UserGrantCascadeRemovedType,
 			resourceOwner,
 		),
-		userID:    userID,
-		projectID: projectID,
+		userID:         userID,
+		projectID:      projectID,
+		projectGrantID: projectGrantID,
 	}
 }