Database lock error when updating experiment status

[radusuciu]

Task ctesi.core.tasks.convert_task[f17e0507-8f93-4405-a099-ddac4fe54a69] raised unexpected: OperationalError('(sqlite3.OperationalError) database is locked',)
Traceback (most recent call last):
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 724, in _commit_impl
    self.engine.dialect.do_commit(self.connection)
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/engine/default.py", line 462, in do_commit
    dbapi_connection.commit()
sqlite3.OperationalError: database is locked

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/celery/app/trace.py", line 382, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/celery/app/trace.py", line 641, in __protected_call__
    return self.run(*args, **kwargs)
  File "/home/ctesi/ctesi/ctesi/core/tasks.py", line 83, in convert_task
    status_callback=lambda s: update_status(experiment_id, 'converting', meta=s),
  File "/home/ctesi/ctesi/ctesi/core/convert.py", line 22, in convert
    status_callback(status)
  File "/home/ctesi/ctesi/ctesi/core/tasks.py", line 83, in <lambda>
    status_callback=lambda s: update_status(experiment_id, 'converting', meta=s),
  File "/home/ctesi/ctesi/ctesi/api/__init__.py", line 71, in update_experiment_status
    db.session.commit()
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/orm/scoping.py", line 153, in do
    return getattr(self.registry(), name)(*args, **kwargs)
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 943, in commit
    self.transaction.commit()
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/orm/session.py", line 471, in commit
    t[1].commit()
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1643, in commit
    self._do_commit()
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1674, in _do_commit
    self.connection._commit_impl()
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 726, in _commit_impl
    self._handle_dbapi_exception(e, None, None, None, None)
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 1413, in _handle_dbapi_exception
    exc_info
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 265, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/util/compat.py", line 248, in reraise
    raise value.with_traceback(tb)
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/engine/base.py", line 724, in _commit_impl
    self.engine.dialect.do_commit(self.connection)
  File "/home/ctesi/ctesi/venv/lib/python3.5/site-packages/sqlalchemy/engine/default.py", line 462, in do_commit
    dbapi_connection.commit()
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) database is locked (Background on this error at: http://sqlalche.me/e/e3q8)