solved issue: #17

appinfo/info.xml

@@ -33,7 +33,7 @@ This way, the migration from Google Authenticator to OTP Manager will be quick a
 * [Official iOS App](https://apps.apple.com/us/app/nextcloud-otp-manager/id6471510170)
 ]]>
   </description>
-  <version>0.3.3</version>
+  <version>0.3.4</version>
   <licence>agpl</licence>
   <author mail="[email protected]" homepage="https://www.convertino.cloud">Matteo Convertino</author>
   <namespace>OtpManager</namespace>

lib/Migration/Version000010Date20240123120000.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace OCA\OtpManager\Migration;
+
+use Closure;
+use OCP\DB\ISchemaWrapper;
+use OCP\Migration\SimpleMigrationStep;
+use OCP\Migration\IOutput;
+use OCA\OtpManager\AppInfo\Application;
+
+class Version000010Date20240123120000 extends SimpleMigrationStep
+{
+	/**
+	 * @param IOutput $output
+	 * @param Closure $schemaClosure The `\Closure` returns a `ISchemaWrapper`
+	 * @param array $options
+	 * @return null|ISchemaWrapper
+	 */
+	public function changeSchema(IOutput $output, Closure $schemaClosure, array $options)
+	{
+		/** @var ISchemaWrapper $schema */
+		$schema = $schemaClosure();
+
+		$table = $schema->getTable(Application::ACCOUNTS_DB);
+
+        $secretCol = $table->getColumn("secret");
+        $nameCol = $table->getColumn("name");
+        $issuerCol = $table->getColumn("issuer");
+        $digitsCol = $table->getColumn("digits");
+        $periodCol = $table->getColumn("period");
+
+        $secretCol->setLength(512);
+        $nameCol->setLength(256);
+        $issuerCol->setLength(256);
+        $digitsCol->setNotnull(false);
+        $periodCol->setNotnull(false);
+
+		return $schema;
+	}
+}