diff --git a/config/sql/se/CollectionEbooks.sql b/config/sql/se/CollectionEbooks.sql
new file mode 100644
index 00000000..321dd8b5
--- /dev/null
+++ b/config/sql/se/CollectionEbooks.sql
@@ -0,0 +1,8 @@
+CREATE TABLE `CollectionEbooks` (
+  `CollectionEbookId` int(10) unsigned NOT NULL AUTO_INCREMENT,
+  `EbookId` int(10) unsigned NOT NULL,
+  `CollectionId` int(10) unsigned NOT NULL,
+  `SequenceNumber` int(10) unsigned NULL,
+  PRIMARY KEY (`CollectionEbookId`),
+  UNIQUE KEY `idxUnique` (`EbookId`,`CollectionId`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
diff --git a/config/sql/se/Collections.sql b/config/sql/se/Collections.sql
index 4276bd75..84d38dec 100644
--- a/config/sql/se/Collections.sql
+++ b/config/sql/se/Collections.sql
@@ -1,11 +1,8 @@
 CREATE TABLE `Collections` (
   `CollectionId` int(10) unsigned NOT NULL AUTO_INCREMENT,
-  `EbookId` int(10) unsigned NOT NULL,
   `Name` varchar(255) NOT NULL,
   `UrlName` varchar(255) NOT NULL,
-  `SequenceNumber` int(10) unsigned NULL,
   `Type` varchar(255) NULL,
   PRIMARY KEY (`CollectionId`),
-  KEY `index1` (`EbookId`),
-  KEY `index2` (`UrlName`)
+  UNIQUE KEY `idxUnique` (`UrlName`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;