What can be recovered?
How to recover deleted entities?
Navigate to Trash Bin in left menu (click on your workspace name to access it), select some deleted entities and click Restore button:
How to recover deleted Database or Field?
It can be done only by Admin. Navigate to Audit Log and filter changes like this (for Database):
Then select a single database and click the Restore button.
How to recover deleted Documents or Views?
Finally, you can undelete Documents and Views. Navigate to Trash Bin, find deleted View, and restore it. It seems now you can undelete everything, we are happy.