This is #41 with the migrations reinstated. The initial migration has been edited to remove the jsonfield dependency. Because jsonfield is just a TextField underneath, Django should theoretically be able to migrate this to being a proper JSONField without a problem. This should theoretically make the upgrade path much smoother.

Needs to be tested on a real project.

Update: tested on a real (internal) project. The migrations applied cleanly and the tests all pass. This is a good sign 😎

The database table looks right:

\d django_dbq_job
                     Table "public.django_dbq_job"
   Column   |           Type           | Collation | Nullable | Default
------------+--------------------------+-----------+----------+---------
 id         | uuid                     |           | not null |
 created    | timestamp with time zone |           | not null |
 modified   | timestamp with time zone |           | not null |
 name       | character varying(100)   |           | not null |
 state      | character varying(20)    |           | not null |
 next_task  | character varying(100)   |           | not null |
 workspace  | jsonb                    |           |          |
 queue_name | character varying(20)    |           | not null |
 priority   | smallint                 |           | not null |

And the jobs that were already in the table were migrated correctly too.

Description copied from #41

So.. this PR does quite a lot, and when it is released will be backwards incompatible. This was necessary to support anything newer than Django 2.2.

django-db-queue is now quite old, and relies on a bunch of unmaintained dependencies. This PR removes them all, at the cost of making the upgrade path a bit of a pain. Details are in the README but in short: you have to drop the jobs table and recreate it.

We now use the cross-database JSONField implementation that was added in Django 3.1, rather than a third-party unmaintained thing. I've also removed the dependency on my own simplesignals library (which I haven't touched in nine years!)

I've removed some stuff that was never used (the create_job management command (which didn't work anyway) and the JobSerializer, which I'd forgotten even existed.