Workers no longer visible

[mbi]

Describe the bug

After some time, the workers are no longer listed:

The worker processes are still there: I can schedule jobs and they get executed at the scheduled time, the workers simply no longer get listed.

To Reproduce
Steps to reproduce the behavior:

1. Restart the worker processes
2. Wait some time (30min to 1h approx)
3. Refresh the queue dashboard or the workers list page
4. The workers are no longer listed

Desktop (please complete the following information):

• OS: Ubuntu 24.04
• python version 3.13
• django version 5.2.6
• django-tasks-scheduler 4.0.7

Additional context
Running the workers via supervisord

[mbi]

Update: running python manage.py scheduler_stats before and after the workers disappear:

Before:

~ python manage.py  scheduler_stats

Django-Scheduler CLI Dashboard

--------------------------------------------------------------------------------
| Name             |    Queued |    Active |  Finished |  Canceled |   Workers |
--------------------------------------------------------------------------------
| default          |         0 |         0 |         0 |         0 |         2 |
--------------------------------------------------------------------------------

After:

~ python manage.py  scheduler_stats
Failed to deserialize sbvm0060-worker.1: WorkerModel.__init__() missing 8 required keyword-only arguments: 'name', 'queue_names', 'pid', 'hostname', 'ip_address', 'version', 'python_version', and 'state'
Traceback (most recent call last):
  File "/home/projects/epfl_sb_student_projects/epfl_sb_student_projects/.venv/lib/python3.13/site-packages/scheduler/redis_models/base.py", line 175, in get
    return cls.deserialize(decode_dict(res, set()))
           ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/projects/epfl_sb_student_projects/epfl_sb_student_projects/.venv/lib/python3.13/site-packages/scheduler/redis_models/base.py", line 135, in deserialize
    instance = super(HashModel, cls).deserialize(data)
  File "/home/projects/epfl_sb_student_projects/epfl_sb_student_projects/.venv/lib/python3.13/site-packages/scheduler/redis_models/base.py", line 111, in deserialize
    res = cls(**data)
TypeError: WorkerModel.__init__() missing 8 required keyword-only arguments: 'name', 'queue_names', 'pid', 'hostname', 'ip_address', 'version', 'python_version', and 'state'
Failed to deserialize sbvm0060-worker.2: WorkerModel.__init__() missing 8 required keyword-only arguments: 'name', 'queue_names', 'pid', 'hostname', 'ip_address', 'version', 'python_version', and 'state'
Traceback (most recent call last):
  File "/home/projects/epfl_sb_student_projects/epfl_sb_student_projects/.venv/lib/python3.13/site-packages/scheduler/redis_models/base.py", line 175, in get
    return cls.deserialize(decode_dict(res, set()))
           ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/projects/epfl_sb_student_projects/epfl_sb_student_projects/.venv/lib/python3.13/site-packages/scheduler/redis_models/base.py", line 135, in deserialize
    instance = super(HashModel, cls).deserialize(data)
  File "/home/projects/epfl_sb_student_projects/epfl_sb_student_projects/.venv/lib/python3.13/site-packages/scheduler/redis_models/base.py", line 111, in deserialize
    res = cls(**data)
TypeError: WorkerModel.__init__() missing 8 required keyword-only arguments: 'name', 'queue_names', 'pid', 'hostname', 'ip_address', 'version', 'python_version', and 'state'

Django-Scheduler CLI Dashboard

--------------------------------------------------------------------------------
| Name             |    Queued |    Active |  Finished |  Canceled |   Workers |
--------------------------------------------------------------------------------
| default          |         0 |         0 |         0 |         0 |         0 |
--------------------------------------------------------------------------------

[gkieninger]

I have the same issue, I think it is the same problem like it was with #291