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diff --git a/src/auditordb/pg_select_historic_reserve_revenue.c b/src/auditordb/pg_select_historic_reserve_revenue.c
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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_select_historic_reserve_revenue.c
+ * @brief Low-level (statement-level) Postgres database access for the exchange
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_error_codes.h"
+#include "taler_dbevents.h"
+#include "taler_pq_lib.h"
+#include "pg_select_historic_reserve_revenue.h"
+#include "pg_helper.h"
+
+
+/**
+ * Closure for #historic_reserve_revenue_cb().
+ */
+struct HistoricReserveRevenueContext
+{
+ /**
+ * Function to call for each result.
+ */
+ TALER_AUDITORDB_HistoricReserveRevenueDataCallback cb;
+
+ /**
+ * Closure for @e cb.
+ */
+ void *cb_cls;
+
+ /**
+ * Plugin context.
+ */
+ struct PostgresClosure *pg;
+
+ /**
+ * Number of results processed.
+ */
+ enum GNUNET_DB_QueryStatus qs;
+};
+
+
+/**
+ * Helper function for #TAH_PG_select_historic_reserve_revenue().
+ * To be called with the results of a SELECT statement
+ * that has returned @a num_results results.
+ *
+ * @param cls closure of type `struct HistoricRevenueContext *`
+ * @param result the postgres result
+ * @param num_results the number of results in @a result
+ */
+static void
+historic_reserve_revenue_cb (void *cls,
+ PGresult *result,
+ unsigned int num_results)
+{
+ struct HistoricReserveRevenueContext *hrc = cls;
+ struct PostgresClosure *pg = hrc->pg;
+
+ for (unsigned int i = 0; i < num_results; i++)
+ {
+ struct GNUNET_TIME_Timestamp start_date;
+ struct GNUNET_TIME_Timestamp end_date;
+ struct TALER_Amount reserve_profits;
+ struct GNUNET_PQ_ResultSpec rs[] = {
+ GNUNET_PQ_result_spec_timestamp ("start_date",
+ &start_date),
+ GNUNET_PQ_result_spec_timestamp ("end_date",
+ &end_date),
+ TALER_PQ_RESULT_SPEC_AMOUNT ("reserve_profits",
+ &reserve_profits),
+ GNUNET_PQ_result_spec_end
+ };
+
+ if (GNUNET_OK !=
+ GNUNET_PQ_extract_result (result,
+ rs,
+ i))
+ {
+ GNUNET_break (0);
+ hrc->qs = GNUNET_DB_STATUS_HARD_ERROR;
+ return;
+ }
+ hrc->qs = i + 1;
+ if (GNUNET_OK !=
+ hrc->cb (hrc->cb_cls,
+ start_date,
+ end_date,
+ &reserve_profits))
+ break;
+ }
+}
+
+
+enum GNUNET_DB_QueryStatus
+TAH_PG_select_historic_reserve_revenue (
+ void *cls,
+ TALER_AUDITORDB_HistoricReserveRevenueDataCallback cb,
+ void *cb_cls)
+{
+ struct PostgresClosure *pg = cls;
+ struct GNUNET_PQ_QueryParam params[] = {
+ GNUNET_PQ_query_param_end
+ };
+ enum GNUNET_DB_QueryStatus qs;
+ struct HistoricReserveRevenueContext hrc = {
+ .cb = cb,
+ .cb_cls = cb_cls,
+ .pg = pg
+ };
+
+ PREPARE (pg,
+ "auditor_historic_reserve_summary_select",
+ "SELECT"
+ " start_date"
+ ",end_date"
+ ",reserve_profits"
+ " FROM auditor_historic_reserve_summary");
+ qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
+ "auditor_historic_reserve_summary_select",
+ params,
+ &historic_reserve_revenue_cb,
+ &hrc);
+ if (0 >= qs)
+ return qs;
+ return hrc.qs;
+}