diff --git a/internal/workbenchruntime/service.go b/internal/workbenchruntime/service.go
index 71edf937..c3de380b 100644
--- a/internal/workbenchruntime/service.go
+++ b/internal/workbenchruntime/service.go
@@ -1760,8 +1760,7 @@ func (s *Server) readProjectionOutbox(ctx context.Context, query outboxQuery) ([
 			var outboxSeq, projectedSeq, sourceSeq sql.NullInt64
 			var traceID, sessionID, turnID, messageID, sourceEventID, commitType sql.NullString
 			var terminal, sealed sql.NullBool
-			var raw sql.NullString
-			var createdAt sql.NullTime
+			var raw, createdAt sql.NullString
 			if err := rows.Scan(&outboxSeq, &traceID, &sessionID, &turnID, &messageID, &projectedSeq, &sourceSeq, &sourceEventID, &commitType, &terminal, &sealed, &raw, &createdAt); err != nil {
 				return err
 			}
@@ -1782,7 +1781,7 @@ func (s *Server) readProjectionOutbox(ctx context.Context, query outboxQuery) ([
 				"terminal":      nullableBool(terminal),
 				"sealed":        nullableBool(sealed),
 				"payload":       payload,
-				"createdAt":     nullableTime(createdAt),
+				"createdAt":     nullableTimeText(createdAt),
 				"valuesPrinted": false,
 			})
 		}