Add Django-5.1 support #152

[shimizukawa]

• Add Django-5.1 support #152

Tasks

• update tox and github CI
• update pyproject.toml
• update document
• adapts dropped index_together meta.
• Test with Postgres
• Test with Reshift
• bump version x.Y.z for compatible update

[shimizukawa]

index_together is deprecated (dj42) and removed (dj51).
https://docs.djangoproject.com/en/5.1/releases/5.1/#features-removed-in-5-1

Redshift ignores indexes, so django-redshift-backend does not create any indexes.
I removed this definition because I left it in place when I brought it from the original Django test code.

[shimizukawa]

This comment has been moved into issue #154

[shimizukawa]

backward migration is not worked.

(venv) @shimizukawa ➜ /workspaces/django-redshift-backend/examples/dj-sql-explorer (152-dj51) $ python manage.py migrate explorer 0019
Operations to perform:
  Target specific migration: 0019_alter_databaseconnection_engine, from explorer
Running migrations:
(0.170) 
            SELECT c.relname,
            CASE WHEN c.relkind IN ('m', 'v') THEN 'v' ELSE 't' END
            FROM pg_catalog.pg_class c
            LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
            WHERE c.relkind IN ('f', 'm', 'p', 'r', 'v')
                AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
                AND pg_catalog.pg_table_is_visible(c.oid)
        ; args=None; alias=default
  Rendering model states... DONE
  Unapplying explorer.0022_databaseconnection_upload_fingerprint...ALTER TABLE "explorer_databaseconnection" DROP COLUMN "upload_fingerprint" CASCADE; (params ())
(0.200) ALTER TABLE "explorer_databaseconnection" DROP COLUMN "upload_fingerprint" CASCADE; args=(); alias=default
Traceback (most recent call last):
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/manage.py", line 22, in <module>
    main()
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
    utility.execute()
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/core/management/__init__.py", line 436, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/core/management/base.py", line 413, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/core/management/base.py", line 459, in execute
    output = self.handle(*args, **options)
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/core/management/base.py", line 107, in wrapper
    res = handle_func(*args, **kwargs)
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/core/management/commands/migrate.py", line 356, in handle
    post_migrate_state = executor.migrate(
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/db/migrations/executor.py", line 141, in migrate
    state = self._migrate_all_backwards(plan, full_plan, fake=fake)
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/db/migrations/executor.py", line 219, in _migrate_all_backwards
    self.unapply_migration(states[migration], migration, fake=fake)
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/db/migrations/executor.py", line 284, in unapply_migration
    self.recorder.record_unapplied(migration.app_label, migration.name)
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/db/migrations/recorder.py", line 107, in record_unapplied
    self.migration_qs.filter(app=app, name=name).delete()
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/db/models/query.py", line 1188, in delete
    deleted, _rows_count = collector.delete()
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/db/models/deletion.py", line 472, in delete
    count = qs._raw_delete(using=self.using)
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/db/models/query.py", line 1210, in _raw_delete
    cursor = query.get_compiler(using).execute_sql(CURSOR)
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/db/models/sql/compiler.py", line 1549, in execute_sql
    sql, params = self.as_sql()
  File "/workspaces/django-redshift-backend/examples/dj-sql-explorer/venv/lib/python3.10/site-packages/django/db/models/sql/compiler.py", line 1899, in as_sql
    self.connection.features.delete_can_self_reference_subquery
AttributeError: 'DatabaseFeatures' object has no attribute 'delete_can_self_reference_subquery'
(venv) @shimizukawa ➜ /workspaces/django-redshift-backend/examples/dj-sql-explorer (152-dj51) $ 

[shimizukawa]

backward migration is not worked.

fixed by #156