incremental load

When loading data from many tables, and when its necessary to do more than the usual store and drop commands. You often end up with a lot of code that does stuff: Like fetching last timestamp for the load or storing the incremental data. And quite a lot traces to make its works correctly.

So I tend to write some functions for this which lets you save many line of code and make maintenance so much easier.

These functions should work generically for any tables that both have a modified date and an auto incrementing id fields.