feat: added last_updated field for conflict conciliation

src/persistence/api/serializers.py

@@ -19,7 +19,7 @@ class Meta:
             "data",
         )
 
-        read_only_fields = ("id",)
+        read_only_fields = ("id", "last_updated")
 
 
 class UpdateCharacterSerializer(serializers.ModelSerializer):
@@ -33,7 +33,7 @@ class Meta:
             "data",
         )
 
-        read_only_fields = ("id", "account")
+        read_only_fields = ("id", "account", "last_updated")
 
 
 class OtherSerializer(serializers.ModelSerializer):

src/persistence/migrations/0002_character_last_updated.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.2.22 on 2023-11-11 22:53
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('persistence', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='character',
+            name='last_updated',
+            field=models.DateTimeField(auto_now=True, help_text='When was this character last updated? Useful for conciliation with the local cache of a character.'),
+        ),
+    ]

src/persistence/models.py

@@ -26,6 +26,11 @@ class Character(models.Model):
     )
     """The character data."""
 
+    last_updated = models.DateTimeField(
+        auto_now=True,
+        help_text="When was this character last updated? Useful for conciliation with the local cache of a character.",
+    )
+
     def __str__(self):
         return f"{self.account.unique_identifier}'s character"