The version history of an item, newest first

List the version history of one item or expert, newest first: one entry per write, each with who made it (user, ai or system, and the name it was signed with when there is one) and the cause (an edit in the app, an edit over this connection, a restore, Roma's own passes). Each entry is the body as it was BEFORE that write, so the entry naming an edit is the state that undoes it; restore_version puts one back. Use it to undo an edit, or to see how a body or an expert's instructions changed over time.