Which Drupal log file is available to proof when exactly some content was deleted and by whom? Somebody claimed that content has disappeared from their site. Of course like magically. No one has deleted it, they said. 

How can I find out if content was deleted and by whom? Do I have to set up rules to notify me? Or is there a log that I'm overlooking? I already looked into admin/reports/dblog without success.
Check out their http://example.com/admin/reports/dblog. You should have messages like this one:

Type        content
Date        Wednesday, June 5, 2013 - 09:11
User        admin
Location    http://localhost/node/1/delete
Referrer    http://localhost/node/1/delete
Message     page: deleted test.


For future, you can use hook_watchdog()


  This hook allows modules to route log events to custom destinations, such as SMS, Email, pager, syslog, ...etc.