Ensure short_code column is case sensitive in Microsoft SQL server

data/migrations/Version20230130090946.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ShlinkMigrations;
+
+use Doctrine\DBAL\Platforms\SQLServerPlatform;
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20230130090946 extends AbstractMigration
+{
+    public function up(Schema $schema): void
+    {
+        $this->skipIf(! $this->isMsSql(), 'This only sets MsSQL-specific database options');
+
+        $shortUrls = $schema->getTable('short_urls');
+        $shortCode = $shortUrls->getColumn('short_code');
+        // Drop the unique index before changing the collation, as the field is part of this index
+        $shortUrls->dropIndex('unique_short_code_plus_domain');
+        $shortCode->setPlatformOption('collation', 'Latin1_General_CS_AS');
+    }
+
+    public function postUp(Schema $schema): void
+    {
+        if ($this->isMsSql()) {
+            // The index needs to be re-created in postUp, but here, we can only use statements run against the
+            // connection directly
+            $this->connection->executeStatement(
+                'CREATE INDEX unique_short_code_plus_domain ON short_urls (domain_id, short_code);',
+            );
+        }
+    }
+
+    public function down(Schema $schema): void
+    {
+        // No down
+    }
+
+    public function isTransactional(): bool
+    {
+        return false;
+    }
+
+    private function isMsSql(): bool
+    {
+        return $this->connection->getDatabasePlatform() instanceof SQLServerPlatform;
+    }
+}