JukeAlert - Updated snitches to include the last visit date by a semi
owner (moderator / owner).  This is included as a date-time column in
the snitch table directly with appropriate index.  Date being logged
as UTC with 100 batched up before inserting (or 1 sec - same as other
flush).  This change doesnt include any of the other requested functionality
and is just the basic block for the other ones (querying/culling).