fix(api): made Score unique per passport (#231)

api/registry/migrations/0009_alter_score_passport.py

@@ -0,0 +1,23 @@
+# Generated by Django 4.1.7 on 2023-04-24 21:18
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("registry", "0008_remove_passport_passport"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="score",
+            name="passport",
+            field=models.ForeignKey(
+                on_delete=django.db.models.deletion.PROTECT,
+                related_name="score",
+                to="registry.passport",
+                unique=True,
+            ),
+        ),
+    ]

api/registry/models.py

@@ -45,7 +45,7 @@ class Status:
     ]
 
     passport = models.ForeignKey(
-        Passport, on_delete=models.PROTECT, related_name="score"
+        Passport, on_delete=models.PROTECT, related_name="score", unique=True
     )
     score = models.DecimalField(null=True, blank=True, decimal_places=9, max_digits=18)
     last_score_timestamp = models.DateTimeField(default=None, null=True, blank=True)