From fbfbaa48a5cd376c7627fc9265985a3dc045545c Mon Sep 17 00:00:00 2001
From: Kijin Sung <kijin@kijinsung.com>
Date: Thu, 22 Jun 2023 22:03:43 +0900
Subject: [PATCH] Add unique index on mid

---
 modules/module/module.class.php    | 13 +++++++++++--
 modules/module/schemas/modules.xml |  2 +-
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/modules/module/module.class.php b/modules/module/module.class.php
index 7778d7efa..e19fc2dbb 100644
--- a/modules/module/module.class.php
+++ b/modules/module/module.class.php
@@ -73,7 +73,10 @@ class Module extends ModuleObject
 		// Add domain_srl column
 		if (!$oDB->isColumnExists('modules', 'domain_srl')) return true;
 		if (!$oDB->isIndexExists('modules', 'idx_domain_srl')) return true;
-		if (!$oDB->isIndexExists('modules', 'idx_mid')) return true;
+		if (!$oDB->isIndexExists('modules', 'idx_mid') && !$oDB->isIndexExists('modules', 'unique_mid'))
+		{
+			return true;
+		}
 
 		// check fix mskin
 		if(!$oDB->isColumnExists("modules", "is_mskin_fix")) return true;
@@ -193,7 +196,13 @@ class Module extends ModuleObject
 		{
 			$oDB->addIndex('modules', 'idx_domain_srl', array('domain_srl'));
 		}
-		if (!$oDB->isIndexExists('modules', 'idx_mid'))
+
+		// Try adding a unique index on mid, but fall back to a regular index if not possible.
+		if (!$oDB->isIndexExists('modules', 'unique_mid'))
+		{
+			$oDB->addIndex('modules', 'unique_mid', array('mid'), true);
+		}
+		elseif (!$oDB->isIndexExists('modules', 'idx_mid'))
 		{
 			$oDB->addIndex('modules', 'idx_mid', array('mid'));
 		}
diff --git a/modules/module/schemas/modules.xml b/modules/module/schemas/modules.xml
index 4d77670ec..f50e059be 100644
--- a/modules/module/schemas/modules.xml
+++ b/modules/module/schemas/modules.xml
@@ -5,7 +5,7 @@
     <column name="menu_srl" type="number" size="11" notnull="notnull" default="0" />
     <column name="site_srl" type="number" size="11" notnull="notnull" default="0" />
     <column name="domain_srl" type="number" size="11" notnull="notnull" default="-1" index="idx_domain_srl" />
-    <column name="mid" type="varchar" size="40" notnull="notnull" />
+    <column name="mid" type="varchar" size="40" notnull="notnull" unique="unique_mid" />
     <column name="layout_srl" type="number" size="11" default="0" />
     <column name="mlayout_srl" type="number" size="11" default="0" />
     <column name="use_mobile" type="char" size="1" default="N" />