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diff --git a/src/exchangedb/pg_get_reserve_history.h b/src/exchangedb/pg_get_reserve_history.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 pg_get_reserve_history.h
+ * @brief implementation of the get_reserve_history function
+ * @author Christian Grothoff
+ */
+#ifndef PG_GET_RESERVE_HISTORY_H
+#define PG_GET_RESERVE_HISTORY_H
+
+#include "taler_util.h"
+#include "taler_json_lib.h"
+#include "taler_exchangedb_plugin.h"
+
+
+/**
+ * Compile a list of (historic) transactions performed with the given reserve
+ * (withdraw, incoming wire, open, close operations). Should return 0 if the @a
+ * reserve_pub is unknown, otherwise determine @a etag_out and if it is past @a
+ * etag_in return the history after @a start_off. @a etag_out should be set
+ * to the last row ID of the given @a reserve_pub in the reserve history table.
+ *
+ * @param cls the `struct PostgresClosure` with the plugin-specific state
+ * @param reserve_pub public key of the reserve
+ * @param start_off maximum starting offset in history to exclude from returning
+ * @param etag_in up to this offset the client already has a response, do not
+ * return anything unless @a etag_out will be larger
+ * @param[out] etag_out set to the latest history offset known for this @a coin_pub
+ * @param[out] balance set to the reserve balance
+ * @param[out] rhp set to known transaction history (NULL if reserve is unknown)
+ * @return transaction status
+ */
+enum GNUNET_DB_QueryStatus
+TEH_PG_get_reserve_history (
+ void *cls,
+ const struct TALER_ReservePublicKeyP *reserve_pub,
+ uint64_t start_off,
+ uint64_t etag_in,
+ uint64_t *etag_out,
+ struct TALER_Amount *balance,
+ struct TALER_EXCHANGEDB_ReserveHistory **rhp);
+
+
+#endif