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diff --git a/src/exchangedb/pg_insert_history_request.h b/src/exchangedb/pg_insert_history_request.h
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+++ b/src/exchangedb/pg_insert_history_request.h
@@ -0,0 +1,53 @@
+/*
+   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_insert_history_request.h
+ * @brief implementation of the insert_history_request function for Postgres
+ * @author Christian Grothoff
+ */
+#ifndef PG_INSERT_HISTORY_REQUEST_H
+#define PG_INSERT_HISTORY_REQUEST_H
+
+#include "taler_util.h"
+#include "taler_json_lib.h"
+#include "taler_exchangedb_plugin.h"
+/**
+ * Function called to persist a signature that
+ * prove that the client requested an
+ * account history.  Debits the @a history_fee from
+ * the reserve (if possible).
+ *
+ * @param cls the @e cls of this struct with the plugin-specific state
+ * @param reserve_pub account that the history was requested for
+ * @param reserve_sig signature affirming the request
+ * @param request_timestamp when was the request made
+ * @param history_fee how much should the @a reserve_pub be charged for the request
+ * @param[out] balance_ok set to TRUE if the reserve balance
+ *         was sufficient
+ * @param[out] idempotent set to TRUE if the request is already in the DB
+ * @return transaction status code
+ */
+enum GNUNET_DB_QueryStatus
+TEH_PG_insert_history_request (
+  void *cls,
+  const struct TALER_ReservePublicKeyP *reserve_pub,
+  const struct TALER_ReserveSignatureP *reserve_sig,
+  struct GNUNET_TIME_Timestamp request_timestamp,
+  const struct TALER_Amount *history_fee,
+  bool *balance_ok,
+  bool *idempotent);
+
+#endif