Delete files in db model methods.

web/app/results/tasks.py

@@ -1,17 +1,13 @@
+from .. import db
 from ..decorators import background
 from ..models import Result
-import os
-import shutil
 
 
 @background
 def delete_result(result_id, *args, **kwargs):
-    app = kwargs['app']
-    with app.app_context():
+    with kwargs['app'].app_context():
         result = Result.query.get(result_id)
         if result is None:
-            return
-        result_file_path = os.path.join(app.config['NOPAQUE_STORAGE'],
-                                        result.file[0].dir)
-        shutil.rmtree(result_file_path)
+            raise Exception('Result {} not found'.format(result_id))
         result.delete()  # cascades down and also deletes ResultFile
+        db.session.commit()