EZEE-2526: Missing index on ezpage_map_blocks_zones causes long query execution time (ibexa#424)

Author: kmadejski

docs/releases/updating_ez_platform.md

@@ -326,7 +326,8 @@ Some versions require updates to the database. Look through [the list of databas
         DROP TABLE IF EXISTS `ezpage_map_blocks_zones`;
         CREATE TABLE `ezpage_map_blocks_zones` (
           `block_id` int(11) NOT NULL,
-          `zone_id` int(11) NOT NULL
+          `zone_id` int(11) NOT NULL,
+          PRIMARY KEY (`block_id`, `zone_id`)
         ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
 
         DROP TABLE IF EXISTS `ezpage_map_zones_pages`;