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diff --git a/src/backenddb/merchant-0012.sql b/src/backenddb/merchant-0012.sql
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+--
+-- This file is part of TALER
+-- Copyright (C) 2024 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 merchant-0012.sql
+-- @brief Remove bogus UNIQUE constraint on categories (#9266)
+-- @author Christian Grothoff
+
+-- Everything in one big transaction
+BEGIN;
+
+-- Check patch versioning is in place.
+SELECT _v.register_patch('merchant-0012', NULL, NULL);
+
+SET search_path TO merchant;
+
+ALTER TABLE merchant_categories
+  DROP CONSTRAINT merchant_categories_category_name_key,
+  ADD UNIQUE (merchant_serial,category_name);
+
+COMMIT;