If you’re recording events as intent, then the event table is the source of truth and the state of the database is effectively snapshot of the state. In principle, you should be able to replay the events to produce the current state. If it calculates wrong, go fix your calculator, assume your events table isn’t wrong, and replay.

If you’re storing a log of database changes (what’s usually meant by an audit table), as in

(Table_Name, Column_Name, Old_Value, New_Value, Timestamp)

Then the database state is the source of truth, and the audit table is simply a record of changes ever occurred that reached that state.

In either case, there’s a single source of truth.