fix(db): migrations adding context type and id

* Return the schema - even if the migrations do nothing.
* Use the plain column name of the column to set.
  Fixes the migration on postgres DB.

Signed-off-by: Max <max@nextcloud.com>

Author: max-nextcloud

lib/Migration/Version090000Date20260817110024.php

@@ -45,8 +45,7 @@ public function changeSchema(IOutput $output, Closure $schemaClosure, array $opt
 			$table->modifyColumn('id', [
 				'autoincrement' => true,
 			]);
-			return $schema;
 		}
-		return null;
+		return $schema;
 	}
 }

lib/Migration/Version090000Date20260819110024.php

@@ -36,11 +36,11 @@ public function __construct(
 	public function preSchemaChange(IOutput $output, Closure $schemaClosure, array $options) {
 		$qb = $this->connection->getQueryBuilder();
 		$qb->update('text_documents', 'd')
-			->set('d.context_type', $qb->createNamedParameter('file'))
+			->set('context_type', $qb->createNamedParameter('file'))
 			->where($qb->expr()->isNull('context_type'))
 			->executeStatement();
 		$qb->update('text_documents', 'd')
-			->set('d.context_id', 'd.id')
+			->set('context_id', 'd.id')
 			->where($qb->expr()->isNull('context_id'))
 			->executeStatement();
 	}
@@ -63,8 +63,7 @@ public function changeSchema(IOutput $output, Closure $schemaClosure, array $opt
 			$table->modifyColumn('context_id', [
 				'notnull' => true,
 			]);
-			return $schema;
 		}
-		return null;
+		return $schema;
 	}
 }