Excuse me for the title as I can't find the best way to express the question correctly.
I'm developing an extension and apart from the tables with data that I've already created I need to store and access a singe value. In my case this value is a time-stamp of the last sync I did with some external data source.
What is the best way to store this value? Should it be a custom variable, a hidden config value, should I create a table just to store this value, should I add a field to every entry keeping last sync date or is there any other way that I miss?
Please if you see the relevance of the question but think the title is misleading give me an idea of a better title to change it.