initial implementation

management/server/activity/store/sql_store.go

@@ -227,6 +227,32 @@ func (store *Store) saveDeletedUserEmailAndNameInEncrypted(event *activity.Event
 	return event.Meta, nil
 }
 
+// UpdateUserID updates all references to oldUserID in events and deleted_users tables.
+func (store *Store) UpdateUserID(ctx context.Context, oldUserID, newUserID string) error {
+	return store.db.Transaction(func(tx *gorm.DB) error {
+		if err := tx.Model(&activity.Event{}).
+			Where("initiator_id = ?", oldUserID).
+			Update("initiator_id", newUserID).Error; err != nil {
+			return fmt.Errorf("update events.initiator_id: %w", err)
+		}
+
+		if err := tx.Model(&activity.Event{}).
+			Where("target_id = ?", oldUserID).
+			Update("target_id", newUserID).Error; err != nil {
+			return fmt.Errorf("update events.target_id: %w", err)
+		}
+
+		// Raw exec: GORM can't update a PK via Model().Update()
+		if err := tx.Exec(
+			"UPDATE deleted_users SET id = ? WHERE id = ?", newUserID, oldUserID,
+		).Error; err != nil {
+			return fmt.Errorf("update deleted_users.id: %w", err)
+		}
+
+		return nil
+	})
+}
+
 // Close the Store
 func (store *Store) Close(_ context.Context) error {
 	if store.db != nil {