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The correction is the only supervised signal in the box, so the cost of giving one has to be near zero. That means the surface needs the trace id of the turn it is showing, which it had no way to learn: handleText returns one string and the trace was written after the reply left. The id rides back on ChatReply through the same context sink querySource uses, so the mic, telegram and the web keep the one signature they share. CorrectTurn takes a trace id and an optional target, which is deliberately reach-agnostic: nothing about it assumes a browser. store.ErrNoSuchTrace gets a wire twin. A turn past the retention bound is gone, and that is the expected outcome of correcting an old turn, not a broken database.