Logging User Activity

There is a granule to use standard logging. The form is General ledger=>Setup=>Change log setup.
If you don't have it, you can put some code in the OnInsert,OnModify,OnDelete,OnRename-triggers of the table. And use rec and xRec to confront the changes in the records.
Remember that these triggers will only be fired if changes happen in the form or in code with e.g. INSERT(TRUE).

Some idea:
Create a singleinstance codeunit with a temptable in it and a function that gives you the table id and primary key of the table. The function saves it in the temptable of the singleinstance codeunit. Don't save it in the real table because this function must be called from the OnAfterGetCurrentRecord-trigger of the different forms and saving to the table is not allowed.
Put automation "'Navision Timer 1.0'.Timer" (with property WithEvents) in that codeunit and enable it when the function is called the first time.
In the "autTimer::Timer(Milliseconds : Integer)" of the codeunit, check the temptable and if there are records, save them in the real DB and delete them from the temptable.
I didn't test if it works, but I think it can work, because you save the records when OUTSIDE ANY OF THE TRIGGERS in the form(s).
Remember also that you will have LOTS of records in that table.
So you also need a table with a biginteger as primary key and property AutoIncrement=yes. So you don't need to increment the field yourself.