Changing group-begin index on group exams into unique constraint.

Author: krulis-martin

app/model/entity/GroupExam.php

@@ -8,7 +8,7 @@
 
 /**
  * @ORM\Entity
- * @ORM\Table(indexes={@ORM\Index(name="group_begin_idx", columns={"group_id", "begin"})})
+ * @ORM\Table(uniqueConstraints={@ORM\UniqueConstraint(columns={"group_id", "begin"})})
  * Holds history record of an exam that took place in a group.
  * The `examBegin`, `examEnd` fields are copied from group to `begin`, `end` fields here,
  * `examLockStrict` is copied to `lockStrict` field.

migrations/Version20260122225237.php

@@ -0,0 +1,31 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Migrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+/**
+ * Auto-generated Migration: Please modify to your needs!
+ */
+final class Version20260122225237 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        // this up() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE group_exam DROP INDEX group_begin_idx, ADD UNIQUE INDEX UNIQ_11E1FDB6FE54D9477A859515 (group_id, begin)');
+    }
+
+    public function down(Schema $schema): void
+    {
+        // this down() migration is auto-generated, please modify it to your needs
+        $this->addSql('ALTER TABLE group_exam DROP INDEX UNIQ_11E1FDB6FE54D9477A859515, ADD INDEX group_begin_idx (group_id, begin)');
+    }
+}