Backport rank cache key size fix

Author: nickygerritsen

ChangeLog

@@ -1,5 +1,9 @@
 DOMjudge Programming Contest Judging System
 
+Version 9.0.1DEV
+---------------------------
+ - Backport adding key size to rankcache table
+
 Version 9.0.0 - 5 October 2025
 ---------------------------
  - API and integration:

webapp/migrations/Version20250309122806.php

@@ -21,8 +21,8 @@ public function up(Schema $schema): void
     {
         // this up() migration is auto-generated, please modify it to your needs
         $this->addSql('ALTER TABLE rankcache ADD sort_key_public TEXT DEFAULT \'\' NOT NULL COMMENT \'Opaque sort key for public audience.\', ADD sort_key_restricted TEXT DEFAULT \'\' NOT NULL COMMENT \'Opaque sort key for restricted audience.\'');
-        $this->addSql('CREATE INDEX sortKeyPublic ON rankcache (sort_key_public)');
-        $this->addSql('CREATE INDEX sortKeyRestricted ON rankcache (sort_key_restricted)');
+        $this->addSql('CREATE INDEX sortKeyPublic ON rankcache (sort_key_public(768))');
+        $this->addSql('CREATE INDEX sortKeyRestricted ON rankcache (sort_key_restricted(768))');
     }
 
     public function down(Schema $schema): void