Add Team/TeamRole/TeamMembership/TeamPicture models and fix two test bugs

- Fix Member.create(): post_save signal creates Member immediately on User creation,
  so new users always hit the hasattr branch; check `created` flag to set initial
  password and notes for genuinely new users
- Fix Season.for_date(): replace get() with filter().order_by("-start_date").first()
  to handle overlapping seasons gracefully and raise DoesNotExist when none match
- Add TeamRole, Team, TeamMembership, TeamPicture models with rules permissions
- Add migration 0002 for new models
- Add test suites for members and teams covering all new model behaviour

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

teams/migrations/0002_team_teamrole_teammembership_team_members_and_more.py

@@ -0,0 +1,103 @@
+# Generated by Django 6.0.3 on 2026-06-01 20:21
+
+import django.core.validators
+import django.db.models.deletion
+import django_extensions.db.fields
+import rules.contrib.models
+import teams.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('members', '0006_member_notes'),
+        ('teams', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Team',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=255, unique=True, verbose_name='name')),
+                ('short_name', models.CharField(blank=True, help_text='An optional short name for the team', max_length=255, null=True, unique=True, verbose_name='short name')),
+                ('slug', django_extensions.db.fields.AutoSlugField(blank=True, editable=False, max_length=255, populate_from='name', unique=True, verbose_name='slug')),
+                ('logo', models.ImageField(blank=True, null=True, upload_to='teams/logo/', verbose_name='logo')),
+                ('created', models.DateTimeField(auto_now_add=True)),
+                ('updated', models.DateTimeField(auto_now=True)),
+            ],
+            options={
+                'verbose_name': 'team',
+                'verbose_name_plural': 'teams',
+                'ordering': ['name'],
+            },
+            bases=(rules.contrib.models.RulesModelMixin, models.Model),
+        ),
+        migrations.CreateModel(
+            name='TeamRole',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=255, unique=True, verbose_name='name')),
+                ('abbreviation', models.CharField(help_text='An abbreviated version of the role name', max_length=255, unique=True, verbose_name='abbreviation')),
+                ('staff_role', models.BooleanField(default=False, help_text='A staff role is any supporting function for a given team (e.g., coach, team manager, ...)', verbose_name='staff role')),
+                ('admin_role', models.BooleanField(default=False, help_text='An admin role is a role that has administrative privileges and can change team information and settings', verbose_name='admin role')),
+                ('sort_order', models.PositiveIntegerField(default=10, help_text='The order in which the role should be displayed (low to high)', verbose_name='sort order')),
+                ('created', models.DateTimeField(auto_now_add=True)),
+                ('updated', models.DateTimeField(auto_now=True)),
+            ],
+            options={
+                'verbose_name': 'team role',
+                'verbose_name_plural': 'team roles',
+                'ordering': ['sort_order'],
+            },
+            bases=(rules.contrib.models.RulesModelMixin, models.Model),
+        ),
+        migrations.CreateModel(
+            name='TeamMembership',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('number', models.PositiveIntegerField(blank=True, null=True, validators=[django.core.validators.MinValueValidator(1), django.core.validators.MaxValueValidator(99)], verbose_name='number')),
+                ('captain', models.BooleanField(default=False, verbose_name='captain')),
+                ('alternate_captain', models.BooleanField(default=False, verbose_name='alternate captain')),
+                ('created', models.DateTimeField(auto_now_add=True)),
+                ('modified', models.DateTimeField(auto_now=True)),
+                ('member', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='team_memberships', to='members.member', verbose_name='member')),
+                ('season', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='team_memberships', to='teams.season', verbose_name='season')),
+                ('team', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='teams.team', verbose_name='team')),
+                ('role', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='team_memberships', to='teams.teamrole', verbose_name='role')),
+            ],
+            options={
+                'verbose_name': 'team membership',
+                'verbose_name_plural': 'team memberships',
+                'ordering': ['team__name', 'role__sort_order', 'number', 'member__user__last_name', 'member__user__first_name'],
+            },
+            bases=(rules.contrib.models.RulesModelMixin, models.Model),
+        ),
+        migrations.AddField(
+            model_name='team',
+            name='members',
+            field=models.ManyToManyField(through='teams.TeamMembership', to='members.member', verbose_name='members'),
+        ),
+        migrations.CreateModel(
+            name='TeamPicture',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('picture', models.ImageField(upload_to=teams.models.team_season_file_path, verbose_name='picture')),
+                ('created', models.DateTimeField(auto_now_add=True)),
+                ('modified', models.DateTimeField(auto_now=True)),
+                ('season', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='teams.season', verbose_name='season')),
+                ('team', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='teams.team', verbose_name='team')),
+            ],
+            options={
+                'verbose_name': 'team picture',
+                'verbose_name_plural': 'team pictures',
+                'ordering': ['team__name', 'season__start_date'],
+            },
+            bases=(rules.contrib.models.RulesModelMixin, models.Model),
+        ),
+        migrations.AddConstraint(
+            model_name='teammembership',
+            constraint=models.UniqueConstraint(fields=('team', 'season', 'number'), name='unique_team_membership_number', violation_error_message='A team can only have one member for a given season and number.'),
+        ),
+    ]