add unique constraint on name + hostmask

I'm thinking that the command to log out will be LOGOUT <name>, which
means the user hostmask must have an unambiguous link to name

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

idlerpg/migrations/0002_character_player_must_have_unique_character_names.py

@@ -0,0 +1,17 @@
+# Generated by Django 5.0.5 on 2024-05-10 18:36
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('idlerpg', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddConstraint(
+            model_name='character',
+            constraint=models.UniqueConstraint(models.F('name'), models.F('hostmask'), name='player_must_have_unique_character_names'),
+        ),
+    ]

idlerpg/models.py

@@ -121,6 +121,7 @@ class Character(models.Model):
         constraints = [
             models.UniqueConstraint("game", "hostmask", name="one_player_character_per_game"),
             models.UniqueConstraint("game", "name", name="no_characters_with_same_name_per_game"),
+            models.UniqueConstraint("name", "hostmask", name="player_must_have_unique_character_names"),
         ]
 
     def __str__(self):