Perhaps a step by step description will get some responses.
There is no default history of changes done to the database.
One can be added.
This link is to a small article about histories.
It includes a link to a video that demonstrates the technique (avail to everyone)
The easiest would be to use the product FM Dataguard. Another option may be to creating custom menus and use your own delete script that would record any delete actions into a log table.