Everybody who has signed up, what is true of them right now, and every tool for doing something about it. The Front Office is next door — that room is the staff list.
A report is one member telling you about another. Deciding it takes the content down, does something about the author, or neither — in one move, so nobody is left having removed the post and forgotten the person.
Every moderator action, written when it happened and never edited. Readable by every moderator on purpose: a record only the people it could incriminate can read is not much of a record.