Fix minor bugs and improve some model fields

chat_box/migrations/0016_alter_room_unique_together.py

@@ -0,0 +1,32 @@
+# Generated by Django 3.2.18 on 2024-08-22 03:12
+
+from django.db import migrations, models
+
+
+def remove_duplicates(apps, schema_editor):
+    Room = apps.get_model("chat_box", "Room")
+    seen = set()
+
+    for room in Room.objects.all():
+        pair = (room.user_one_id, room.user_two_id)
+        reverse_pair = (room.user_two_id, room.user_one_id)
+
+        if pair in seen or reverse_pair in seen:
+            room.delete()
+        else:
+            seen.add(pair)
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("chat_box", "0015_room_last_msg_time"),
+    ]
+
+    operations = [
+        migrations.RunPython(remove_duplicates),
+        migrations.AlterUniqueTogether(
+            name="room",
+            unique_together={("user_one", "user_two")},
+        ),
+    ]