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diff --git a/src/exchangedb/pg_lookup_auditor_timestamp.h b/src/exchangedb/pg_lookup_auditor_timestamp.h
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+/*
+ This file is part of TALER
+ Copyright (C) 2022 Taler Systems SA
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
+ */
+/**
+ * @file exchangedb/pg_lookup_auditor_timestamp.h
+ * @brief implementation of the lookup_auditor_timestamp function for Postgres
+ * @author Christian Grothoff
+ */
+#ifndef PG_LOOKUP_AUDITOR_TIMESTAMP_H
+#define PG_LOOKUP_AUDITOR_TIMESTAMP_H
+
+#include "taler_util.h"
+#include "taler_json_lib.h"
+#include "taler_exchangedb_plugin.h"
+
+/**
+ * Check the last date an auditor was modified.
+ *
+ * @param cls closure
+ * @param auditor_pub key to look up information for
+ * @param[out] last_date last modification date to auditor status
+ * @return transaction status code
+ */
+enum GNUNET_DB_QueryStatus
+TEH_PG_lookup_auditor_timestamp (
+ void *cls,
+ const struct TALER_AuditorPublicKeyP *auditor_pub,
+ struct GNUNET_TIME_Timestamp *last_date);
+#endif