fix: make TestInstance duration_seconds nullable (#398)

* feat: create LastRollupDate model

this will be used in cache rollup cron to determine which repo branch
combos to run the cache test rollups task for

* fix: make TestInstance duration_seconds nullable

* chore: make lint

* fix: reorder migrations

* fix: update duration_seconds->null migration

shared/django_apps/reports/migrations/0033_alter_testinstance_duration_seconds.py

@@ -0,0 +1,26 @@
+# Generated by Django 4.2.16 on 2024-11-27 14:46
+
+from django.db import migrations, models
+
+"""
+BEGIN;
+--
+-- Alter field duration_seconds on testinstance
+--
+ALTER TABLE "reports_testinstance" ALTER COLUMN "duration_seconds" DROP NOT NULL;
+COMMIT;
+"""
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("reports", "0032_reportsession_reports_upload_order_number"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="testinstance",
+            name="duration_seconds",
+            field=models.FloatField(null=True),
+        ),
+    ]

shared/django_apps/reports/models.py

@@ -301,7 +301,7 @@ class Outcome(models.TextChoices):
         ERROR = "error"
         PASS = "pass"
 
-    duration_seconds = models.FloatField()
+    duration_seconds = models.FloatField(null=True)
     outcome = models.CharField(max_length=100, choices=Outcome.choices)
     upload = models.ForeignKey(
         "ReportSession",