Change further columns to be nullable with a default of 0

Signed-off-by: Julius Härtl <jus@bitgrid.net>

core/Migrations/Version13000Date20170718121200.php

 			]);
 			$table->setPrimaryKey(['id']);
 			$table->addIndex(['class'], 'job_class_index');
-		} else {
-			$table = $schema->getTable('jobs');
-			$table->changeColumn('execution_duration', [
-				'notnull' => true,
-				'default' => 0,
-			]);
 		}
 
 		if (!$schema->hasTable('users')) {
 				'default' => '',
 			]);
 			$table->addColumn('type', 'smallint', [
-				'notnull' => true,
+				'notnull' => false,
 				'length' => 2,
 				'default' => 0,
 				'unsigned' => true,
 			]);
 			$table->addColumn('remember', 'smallint', [
-				'notnull' => true,
+				'notnull' => false,
 				'length' => 1,
 				'default' => 0,
 				'unsigned' => true,
 			]);
 			$table->addColumn('last_activity', 'integer', [
-				'notnull' => true,
+				'notnull' => false,
 				'length' => 4,
 				'default' => 0,
 				'unsigned' => true,
 			]);
 			$table->addColumn('last_check', 'integer', [
-				'notnull' => true,
+				'notnull' => false,
 				'length' => 4,
 				'default' => 0,
 				'unsigned' => true,

core/Migrations/Version13000Date20170919121250.php

 			$column->setUnsigned(true);
 		} else {
 			$table->addColumn('remember', 'smallint', [
-				'notnull' => true,
+				'notnull' => false,
 				'length' => 1,
 				'default' => 0,
 				'unsigned' => true,

core/Migrations/Version21000Date20201120141228.php

 			if ($loginNameColumn->getLength() !== 255) {
 				$loginNameColumn->setLength(255);
 			}
+			$table->changeColumn('type', [
+				'notnull' => false,
+			]);
+			$table->changeColumn('remember', [
+				'notnull' => false,
+			]);
+			$table->changeColumn('last_activity', [
+				'notnull' => false,
+			]);
+			$table->changeColumn('last_check', [
+				'notnull' => false,
+			]);
 		}
 
 		if ($schema->hasTable('dav_job_status')) {
 			}
 		}
 
+		if ($schema->hasTable('jobs')) {
+			$table = $schema->getTable('jobs');
+			$table->changeColumn('execution_duration', [
+				'notnull' => false,
+				'default' => 0,
+			]);
+		}
+
 		return $schema;
 	}
 }