Redo the update for User_Preferences. Sourcing User_Preferences.sql drops the table, losing contents.

db/zm_update-1.37.38.sql

@@ -0,0 +1,39 @@
+--
+-- This adds Manufacturers and Models
+--
+
+SET @s = (SELECT IF(
+    (SELECT COUNT(*)
+      FROM INFORMATION_SCHEMA.TABLES
+      WHERE table_name = 'User_Preferences'
+      AND table_schema = DATABASE()
+    ) > 0,
+    "SELECT 'User_Preferences table exists'",
+    "
+CREATE TABLE `User_Preferences` (
+  `Id` int(10) unsigned NOT NULL auto_increment,
+  `UserId` int(10) unsigned NOT NULL,
+  FOREIGN KEY (UserId) REFERENCES Users(Id),
+  `Name`  varchar(64),
+  `Value` TEXT,
+  PRIMARY KEY (Id)
+)
+    "
+  ));
+
+PREPARE stmt FROM @s;
+EXECUTE stmt;
+
+SET @s = (SELECT IF(
+  (SELECT COUNT(*)
+  FROM INFORMATION_SCHEMA.STATISTICS
+  WHERE table_name = 'User_Preferences'
+  AND table_schema = DATABASE()
+  AND index_name = 'User_Preferences_UserID_idx'
+  ) > 0,
+"SELECT 'UserId Index already exists on User_Preferences table'",
+"CREATE INDEX User_Preferences_UserID_idx on User_Preferences (`UserId`)"
+));
+
+PREPARE stmt FROM @s;
+EXECUTE stmt;

db/zm_update-1.37.38.sql.in

@@ -1 +0,0 @@
-source @PKGDATADIR@/db/User_Preferences.sql

db/zm_update-1.37.47.sql

@@ -0,0 +1,39 @@
+--
+-- This adds Manufacturers and Models
+--
+
+SET @s = (SELECT IF(
+    (SELECT COUNT(*)
+      FROM INFORMATION_SCHEMA.TABLES
+      WHERE table_name = 'User_Preferences'
+      AND table_schema = DATABASE()
+    ) > 0,
+    "SELECT 'User_Preferences table exists'",
+    "
+CREATE TABLE `User_Preferences` (
+  `Id` int(10) unsigned NOT NULL auto_increment,
+  `UserId` int(10) unsigned NOT NULL,
+  FOREIGN KEY (UserId) REFERENCES Users(Id),
+  `Name`  varchar(64),
+  `Value` TEXT,
+  PRIMARY KEY (Id)
+)
+    "
+  ));
+
+PREPARE stmt FROM @s;
+EXECUTE stmt;
+
+SET @s = (SELECT IF(
+  (SELECT COUNT(*)
+  FROM INFORMATION_SCHEMA.STATISTICS
+  WHERE table_name = 'User_Preferences'
+  AND table_schema = DATABASE()
+  AND index_name = 'User_Preferences_UserID_idx'
+  ) > 0,
+"SELECT 'UserId Index already exists on User_Preferences table'",
+"CREATE INDEX User_Preferences_UserID_idx on User_Preferences (`UserId`)"
+));
+
+PREPARE stmt FROM @s;
+EXECUTE stmt;