Hi Lewis,

a couple questions first: i understand the requirement about learning if a study was created/destroyed. to your second requirement, are you trying to figure out if the set of tables changed (i.e. dataset added/deleted) or structure of tables changed (i.e. user adds/removes a field on a dataset), or are you trying to figure out if a change happened to the data, like a standard insert/update/delete event? i could imagine all of these being important, but going after the latter is different than the first ones.

-Ben