From be7d48d2f310923864283a3ce6d836442b96dabb Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sun, 10 Mar 2024 20:47:38 +0100
Subject: add missing constraint

---
 src/exchangedb/0003-purse_deletion.sql | 52 ++++++++++++++++++++++++++++++++++
 src/exchangedb/exchange-0003.sql.in    |  1 +
 2 files changed, 53 insertions(+)
 create mode 100644 src/exchangedb/0003-purse_deletion.sql

diff --git a/src/exchangedb/0003-purse_deletion.sql b/src/exchangedb/0003-purse_deletion.sql
new file mode 100644
index 000000000..66a95ff03
--- /dev/null
+++ b/src/exchangedb/0003-purse_deletion.sql
@@ -0,0 +1,52 @@
+--
+-- 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/>
+--
+
+-- Adds a 'unique' constraint to the 'purse_pub'.
+-- This is not only semantically correct, but also
+-- creates a dramatic speed-up on the
+-- pg_select_purse query (which otherwise fails to
+-- use indices correctly).
+
+CREATE FUNCTION constrain_table_purse_decision3(
+  IN partition_suffix TEXT
+)
+RETURNS VOID
+LANGUAGE plpgsql
+AS $$
+DECLARE
+  table_name TEXT DEFAULT 'purse_decision';
+BEGIN
+  table_name = concat_ws('_', table_name, partition_suffix);
+  EXECUTE FORMAT (
+    'ALTER TABLE ' || table_name ||
+    ' ADD CONSTRAINT ' || table_name || '_purse_decision_purse_pub'
+    ' UNIQUE (purse_pub) '
+  );
+END
+$$;
+
+INSERT INTO exchange_tables
+    (name
+    ,version
+    ,action
+    ,partitioned
+    ,by_range)
+  VALUES
+    ('purse_decision3'
+    ,'exchange-0003'
+    ,'constrain'
+    ,TRUE
+    ,FALSE);
diff --git a/src/exchangedb/exchange-0003.sql.in b/src/exchangedb/exchange-0003.sql.in
index a351b38f3..c94497531 100644
--- a/src/exchangedb/exchange-0003.sql.in
+++ b/src/exchangedb/exchange-0003.sql.in
@@ -20,5 +20,6 @@ SELECT _v.register_patch('exchange-0003', NULL, NULL);
 SET search_path TO exchange;
 
 #include "0003-wire_accounts.sql"
+#include "0003-purse_deletion.sql"
 
 COMMIT;
-- 
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