How to use two queues with different configurations for processes and threads ?

[jdcaballerov]

I need to run one queue exclusively with one thread and one process to enforce linearization. I run a docker container with:

./manage.py rundramatiq --processes 1 --threads 1 -Q default

However I need a second queue for notifications that is not restricted so I run a second container with:

./manage.py rundramatiq --processes 1 --threads 4 -Q notifications

The tasks work but this kind of setup is creating a collision on the task id at the Database level.

postgres_1            | 2020-08-13 21:19:44.423 UTC [686] ERROR:  duplicate key value violates unique constraint "django_dramatiq_task_pkey"
postgres_1            | 2020-08-13 21:19:44.423 UTC [686] DETAIL:  Key (id)=(2ac20d90-dac0-40ec-9192-e52468c21faf) already exists.
postgres_1            | 2020-08-13 21:19:44.423 UTC [686] STATEMENT:  INSERT INTO "django_dramatiq_task" ("id", "status", "created_at", "updated_at", "message_data", "actor_name", "queue_name") VALUES ('2ac20d90-dac0-40ec-9192-e52468c21faf'::uuid, 'enqueued', '2020-08-13T21:19:44.371334+00:00'::timestamptz, '2020-08-13T21:19:44.373001+00:00'::timestamptz, '..... '::bytea, message_user', 'notifications')

Any ideas on how to setup this for my requirement and why is creating a collision when generating the ID ?