We currently have limited undo functionality for specific actions. For deleted rows, an alert/confirmation appears in the bottom-right corner for a few seconds, allowing you to "Undo" the action. However, we can't recover data after that point. For deleted tables, you can restore them from the "Trash" tab on the main workspace. Unfortunately, we don't have the ability to undo other actions or recover deleted columns at this time.
If you need help with specific issues or have suggestions for improving our undo features, please let us know more details. We're always working to enhance our app's functionality.