[Bugsy]

I do not know enough and the code is wrong.

1. nVault supports strings for the key and value fields, it will not accept your iKey variable.
2. What does "iKey = 150" represent .. what does the 150 value correspond to?
3. If the key does not exist, iCurrentTime = get_systime() will never get called so the value will be 0 when used in your else condition.
4. In your else, I believe you want this: if(iTS >= (iCurrentTime + get_systime(259200)))
But I think it, and a lot of your code, can still be improved once I know better what you're doing.
5. The SQL can be changed to "DELETE FROM %s;"