api: drop commit - mark_for_invalidation will commit

rhodecode/controllers/api/api.py

@@ -221,7 +221,6 b' class ApiController(JSONRPCController):'
 
         try:
             invalidated_keys = ScmModel().mark_for_invalidation(repo.repo_name)
-            Session().commit()
             return ('Cache for repository `%s` was invalidated: '
                     'invalidated cache keys: %s' % (repoid, invalidated_keys))
         except Exception: