Is there EV SQL databases description somewhere?

It seems knowledge of the EV SQL DBs structure is very useful in lot of cases. Is it described somewhere?

For instance I need now to figure out what's going on with archived items deletion. I've found out JournalDelete table contains information about delete items but I don't understand what means for example "1" in the column "DeletionStatus", what other values can be there, what can they mean. Same is for other columns.