improced commit-rollback behaviour on multi-step transactions

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

task/src/main/java/de/srsoftware/umbrella/task/SqliteDb.java

@@ -340,7 +340,6 @@ CREATE TABLE IF NOT EXISTS {0} (
 					var addQuery = replaceInto(TABLE_TASK_DEPENDENCIES, TASK_ID, REQUIRED_TASK_ID);
 					for (var reqId : task.requiredTasksIds()) addQuery.values(task.id(), reqId);
 					addQuery.execute(db).close();
-					db.setAutoCommit(true);
 				}
 
 				task.clean(REQUIRED_TASKS_IDS);
@@ -354,7 +353,14 @@ CREATE TABLE IF NOT EXISTS {0} (
 			}
 			return task;
 		} catch (SQLException e){
+			try {
+				db.rollback();
+			} catch (SQLException ignored){};
 			throw failedToStoreObject(task.name()).causedBy(e);
+		} finally {
+			try {
+				db.setAutoCommit(true);
+			} catch (SQLException ignored){};
 		}
 	}