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diff --git a/src/auditordb/9999.sql b/src/auditordb/9999.sql
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+--
+-- This file is part of TALER
+-- Copyright (C) 2014--2020 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/>
+--
+
+-- Everything in one big transaction
+BEGIN;
+
+NOTE: This code is not yet ready / in use. It was archived here
+as we might want this kind of table in the future. It is NOT
+to be installed in a production system (hence in EXTRA_DIST and
+not in the SQL target!)
+
+-- Check patch versioning is in place.
+SELECT _v.register_patch('auditor-9999', NULL, NULL);
+
+
+-- Table with historic business ledger; basically, when the exchange
+-- operator decides to use operating costs for anything but wire
+-- transfers to merchants, it goes in here.  This happens when the
+-- operator users transaction fees for business expenses. purpose
+-- is free-form but should be a human-readable wire transfer
+-- identifier.   This is NOT yet used and outside of the scope of
+-- the core auditing logic. However, once we do take fees to use
+-- operating costs, and if we still want auditor_predicted_result to match
+-- the tables overall, we'll need a command-line tool to insert rows
+-- into this table and update auditor_predicted_result accordingly.
+-- (So this table for now just exists as a reminder of what we'll
+-- need in the long term.)
+CREATE TABLE IF NOT EXISTS auditor_historic_ledger
+  (master_pub BYTEA CONSTRAINT master_pub_ref REFERENCES auditor_exchanges(master_pub) ON DELETE CASCADE
+  ,purpose VARCHAR NOT NULL
+  ,timestamp INT8 NOT NULL
+  ,balance_val INT8 NOT NULL
+  ,balance_frac INT4 NOT NULL
+  );
+CREATE INDEX history_ledger_by_master_pub_and_time
+  ON auditor_historic_ledger
+  (master_pub
+  ,timestamp);
+
+COMMIT;