Add unique index on revisions of package versions

Signed-off-by: Tim Goudriaan <tim@codedmonkey.com>

Author: codedmonkey

migrations/Version20260120114538.php

@@ -73,6 +73,9 @@ private function createMetadataTables(): void
         $this->addSql(<<<'SQL'
             CREATE INDEX IDX_4F143414F44CABFF ON metadata (package_id)
         SQL);
+        $this->addSql(<<<'SQL'
+            CREATE UNIQUE INDEX version_revision_idx ON metadata (version_id, revision)
+        SQL);
         $this->addSql(<<<'SQL'
             CREATE TABLE metadata_keyword (
                 metadata_id INT NOT NULL,
@@ -756,6 +759,9 @@ private function dropCurrentMetadataColumnFromVersionTable(): void
 
     private function dropMetadataTables(): void
     {
+        $this->addSql(<<<'SQL'
+            DROP INDEX version_revision_idx
+        SQL);
         $this->addSql(<<<'SQL'
             ALTER TABLE metadata DROP CONSTRAINT FK_4F1434144BBC2705
         SQL);

src/Doctrine/Entity/Metadata.php

@@ -12,6 +12,7 @@
 
 #[ORM\Entity(repositoryClass: MetadataRepository::class)]
 #[ORM\ChangeTrackingPolicy('DEFERRED_EXPLICIT')]
+#[ORM\UniqueConstraint(name: 'version_revision_idx', columns: ['version_id', 'revision'])]
 class Metadata extends TrackedEntity
 {
     #[ORM\Id]