Add Season model to teams app: define fields, constraints, meta options, and utility methods for date range and current season tracking.

teams/migrations/0001_initial.py

@@ -0,0 +1,48 @@
+# Generated by Django 6.0.3 on 2026-04-18 13:47
+
+import rules.contrib.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = []
+
+    operations = [
+        migrations.CreateModel(
+            name="Season",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("start_date", models.DateField(verbose_name="start date")),
+                ("end_date", models.DateField(verbose_name="end date")),
+            ],
+            options={
+                "verbose_name": "season",
+                "verbose_name_plural": "seasons",
+                "ordering": ["start_date"],
+                "constraints": [
+                    models.UniqueConstraint(
+                        fields=("start_date", "end_date"),
+                        name="season_start_date_end_date_unique",
+                        violation_error_message="Start and end date for a given season must be unique",
+                    ),
+                    models.CheckConstraint(
+                        condition=models.Q(("start_date__lt", models.F("end_date"))),
+                        name="season_start_date_lt_end_date",
+                        violation_error_message="Start date must be before end date.",
+                    ),
+                ],
+            },
+            bases=(rules.contrib.models.RulesModelMixin, models.Model),
+        ),
+    ]