It is the second day that I am encountering a strange thing: my tables in a postresql DB have all been deleted. I am the only one who has access to that system, so it can pretty much rule out that another user has deleted them.

My question is: how can this be? And how can I find out what happened?

I did check the log file, but the only relevant thing I found there was something like:

2017-04-18 22:28:15 BST STATEMENT: drop schema public cascade

Who or what would issues such a command drop schema public cascade? And for what reason?

Any hints are appreciated. Thanks.